// // class.cs: Class and Struct handlers // // Authors: Miguel de Icaza (miguel@gnu.org) // Martin Baulig (martin@ximian.com) // Marek Safar (marek.safar@seznam.cz) // // Dual licensed under the terms of the MIT X11 or GNU GPL // // Copyright 2001, 2002, 2003 Ximian, Inc (http://www.ximian.com) // Copyright 2004-2008 Novell, Inc // using System; using System.Collections.Generic; using System.Runtime.InteropServices; using System.Security; using System.Security.Permissions; using System.Linq; #if NET_2_1 using XmlElement = System.Object; #endif #if STATIC using SecurityType = System.Collections.Generic.List; using IKVM.Reflection; using IKVM.Reflection.Emit; #else using SecurityType = System.Collections.Generic.Dictionary; using System.Reflection; using System.Reflection.Emit; #endif namespace Mono.CSharp { /// /// This is the base class for structs and classes. /// public abstract class TypeContainer : DeclSpace, ITypeDefinition { // // Different context is needed when resolving type container base // types. Type names come from the parent scope but type parameter // names from the container scope. // public struct BaseContext : IMemberContext { TypeContainer tc; public BaseContext (TypeContainer tc) { this.tc = tc; } #region IMemberContext Members public CompilerContext Compiler { get { return tc.Compiler; } } public TypeSpec CurrentType { get { return tc.Parent.CurrentType; } } public TypeParameter[] CurrentTypeParameters { get { return tc.PartialContainer.CurrentTypeParameters; } } public MemberCore CurrentMemberDefinition { get { return tc; } } public bool HasUnresolvedConstraints { get { return true; } } public bool IsObsolete { get { return tc.IsObsolete; } } public bool IsUnsafe { get { return tc.IsUnsafe; } } public bool IsStatic { get { return tc.IsStatic; } } public ModuleContainer Module { get { return tc.Module; } } public string GetSignatureForError () { return tc.GetSignatureForError (); } public IList LookupExtensionMethod (TypeSpec extensionType, string name, int arity, ref NamespaceEntry scope) { return null; } public FullNamedExpression LookupNamespaceAlias (string name) { return tc.Parent.LookupNamespaceAlias (name); } public FullNamedExpression LookupNamespaceOrType (string name, int arity, Location loc, bool ignore_cs0104) { if (arity == 0) { TypeParameter[] tp = CurrentTypeParameters; if (tp != null) { TypeParameter t = TypeParameter.FindTypeParameter (tp, name); if (t != null) return new TypeParameterExpr (t, loc); } } return tc.Parent.LookupNamespaceOrType (name, arity, loc, ignore_cs0104); } #endregion } [Flags] enum CachedMethods { Equals = 1, GetHashCode = 1 << 1, HasStaticFieldInitializer = 1 << 2 } // Whether this is a struct, class or interface public readonly MemberKind Kind; // Holds a list of classes and structures protected List types; List ordered_explicit_member_list; List ordered_member_list; // Holds the list of properties List properties; // Holds the list of constructors protected List instance_constructors; // Holds the list of fields protected List fields; // Holds a list of fields that have initializers protected List initialized_fields; // Holds a list of static fields that have initializers protected List initialized_static_fields; // Holds the list of constants protected List constants; // Holds the methods. List methods; // Holds the events protected List events; // Holds the indexers List indexers; // Holds the operators List operators; // Holds the compiler generated classes protected List compiler_generated; Dictionary hoisted_base_call_proxies; Dictionary Cache = new Dictionary (); // // Pointers to the default constructor and the default static constructor // protected Constructor default_constructor; protected Constructor default_static_constructor; // // Points to the first non-static field added to the container. // // This is an arbitrary choice. We are interested in looking at _some_ non-static field, // and the first one's as good as any. // FieldBase first_nonstatic_field; // // This one is computed after we can distinguish interfaces // from classes from the arraylist `type_bases' // protected TypeSpec base_type; protected TypeExpr base_type_expr; protected TypeExpr[] iface_exprs; protected List type_bases; bool members_defined; bool members_defined_ok; bool type_defined; TypeContainer InTransit; GenericTypeParameterBuilder[] all_tp_builders; public const string DefaultIndexerName = "Item"; private bool seen_normal_indexers = false; private string indexer_name = DefaultIndexerName; protected bool requires_delayed_unmanagedtype_check; bool error; private CachedMethods cached_method; protected TypeSpec spec; TypeSpec current_type; List partial_parts; public int DynamicSitesCounter; /// /// The pending methods that need to be implemented // (interfaces or abstract methods) /// PendingImplementation pending; public TypeContainer (NamespaceEntry ns, DeclSpace parent, MemberName name, Attributes attrs, MemberKind kind) : base (ns, parent, name, attrs) { if (parent != null && parent.NamespaceEntry != ns) throw new InternalErrorException ("A nested type should be in the same NamespaceEntry as its enclosing class"); this.Kind = kind; this.PartialContainer = this; } #region Properties public override TypeSpec CurrentType { get { if (current_type == null) { if (IsGeneric) { // // Switch to inflated version as it's used by all expressions // var targs = CurrentTypeParameters == null ? TypeSpec.EmptyTypes : CurrentTypeParameters.Select (l => l.Type).ToArray (); current_type = spec.MakeGenericType (this, targs); } else { current_type = spec; } } return current_type; } } public override TypeParameter[] CurrentTypeParameters { get { return PartialContainer.type_params; } } int CurrentTypeParametersStartIndex { get { int total = all_tp_builders.Length; if (CurrentTypeParameters != null) { return total - CurrentTypeParameters.Length; } return total; } } public virtual AssemblyDefinition DeclaringAssembly { get { return Module.DeclaringAssembly; } } IAssemblyDefinition ITypeDefinition.DeclaringAssembly { get { return Module.DeclaringAssembly; } } public TypeSpec Definition { get { return spec; } } public bool HasMembersDefined { get { return members_defined; } } #endregion public abstract void Accept (StructuralVisitor visitor); public bool AddMember (MemberCore symbol) { return AddToContainer (symbol, symbol.MemberName.Basename); } public bool AddMember (MemberCore symbol, string name) { return AddToContainer (symbol, name); } protected virtual bool AddMemberType (TypeContainer ds) { return AddToContainer (ds, ds.Basename); } protected virtual void RemoveMemberType (DeclSpace ds) { RemoveFromContainer (ds.Basename); } public void AddConstant (Const constant) { if (!AddMember (constant)) return; if (constants == null) constants = new List (); constants.Add (constant); } public TypeContainer AddTypeContainer (TypeContainer tc) { if (!AddMemberType (tc)) return tc; if (types == null) types = new List (); types.Add (tc); return tc; } public virtual TypeContainer AddPartial (TypeContainer next_part) { return AddPartial (next_part, next_part.Basename); } protected TypeContainer AddPartial (TypeContainer next_part, string name) { next_part.ModFlags |= Modifiers.PARTIAL; TypeContainer tc = GetDefinition (name) as TypeContainer; if (tc == null) return AddTypeContainer (next_part); if ((tc.ModFlags & Modifiers.PARTIAL) == 0) { Report.SymbolRelatedToPreviousError (next_part); Error_MissingPartialModifier (tc); } if (tc.Kind != next_part.Kind) { Report.SymbolRelatedToPreviousError (tc); Report.Error (261, next_part.Location, "Partial declarations of `{0}' must be all classes, all structs or all interfaces", next_part.GetSignatureForError ()); } if ((tc.ModFlags & Modifiers.AccessibilityMask) != (next_part.ModFlags & Modifiers.AccessibilityMask) && ((tc.ModFlags & Modifiers.DEFAULT_ACCESS_MODIFER) == 0 && (next_part.ModFlags & Modifiers.DEFAULT_ACCESS_MODIFER) == 0)) { Report.SymbolRelatedToPreviousError (tc); Report.Error (262, next_part.Location, "Partial declarations of `{0}' have conflicting accessibility modifiers", next_part.GetSignatureForError ()); } if (tc.partial_parts == null) tc.partial_parts = new List (1); if ((next_part.ModFlags & Modifiers.DEFAULT_ACCESS_MODIFER) != 0) { tc.ModFlags |= next_part.ModFlags & ~(Modifiers.DEFAULT_ACCESS_MODIFER | Modifiers.AccessibilityMask); } else if ((tc.ModFlags & Modifiers.DEFAULT_ACCESS_MODIFER) != 0) { tc.ModFlags &= ~(Modifiers.DEFAULT_ACCESS_MODIFER | Modifiers.AccessibilityMask); tc.ModFlags |= next_part.ModFlags; } else { tc.ModFlags |= next_part.ModFlags; } tc.spec.Modifiers = tc.ModFlags; if (next_part.attributes != null) { if (tc.attributes == null) tc.attributes = next_part.attributes; else tc.attributes.AddAttributes (next_part.attributes.Attrs); } next_part.PartialContainer = tc; tc.partial_parts.Add (next_part); return tc; } public virtual void RemoveTypeContainer (TypeContainer next_part) { if (types != null) types.Remove (next_part); Cache.Remove (next_part.Basename); RemoveMemberType (next_part); } public virtual TypeSpec AddDelegate (Delegate d) { AddTypeContainer (d); return null; } private void AddMemberToList (MemberCore mc, List alist, bool isexplicit) { if (ordered_explicit_member_list == null) { ordered_explicit_member_list = new List (); ordered_member_list = new List (); } if (isexplicit) { if (Kind == MemberKind.Interface) { Report.Error (541, mc.Location, "`{0}': explicit interface declaration can only be declared in a class or struct", mc.GetSignatureForError ()); } ordered_explicit_member_list.Add (mc); alist.Insert (0, mc); } else { ordered_member_list.Add (mc); alist.Add (mc); } } public void AddMethod (MethodOrOperator method) { if (!AddToContainer (method, method.MemberName.Basename)) return; if (methods == null) methods = new List (); if (method.MemberName.Left != null) AddMemberToList (method, methods, true); else AddMemberToList (method, methods, false); } public void AddConstructor (Constructor c) { bool is_static = (c.ModFlags & Modifiers.STATIC) != 0; if (!AddToContainer (c, is_static ? Constructor.ConstructorName : Constructor.TypeConstructorName)) return; if (is_static && c.ParameterInfo.IsEmpty){ if (default_static_constructor != null) { Report.SymbolRelatedToPreviousError (default_static_constructor); Report.Error (111, c.Location, "A member `{0}' is already defined. Rename this member or use different parameter types", c.GetSignatureForError ()); return; } default_static_constructor = c; } else { if (c.ParameterInfo.IsEmpty) default_constructor = c; if (instance_constructors == null) instance_constructors = new List (); instance_constructors.Add (c); } } public bool AddField (FieldBase field) { if (!AddMember (field)) return false; if (fields == null) fields = new List (); fields.Add (field); if ((field.ModFlags & Modifiers.STATIC) != 0) return true; if (first_nonstatic_field == null) { first_nonstatic_field = field; return true; } if (Kind == MemberKind.Struct && first_nonstatic_field.Parent != field.Parent) { Report.SymbolRelatedToPreviousError (first_nonstatic_field.Parent); Report.Warning (282, 3, field.Location, "struct instance field `{0}' found in different declaration from instance field `{1}'", field.GetSignatureForError (), first_nonstatic_field.GetSignatureForError ()); } return true; } public void AddProperty (Property prop) { if (!AddMember (prop)) return; if (properties == null) properties = new List (); if (prop.MemberName.Left != null) AddMemberToList (prop, properties, true); else AddMemberToList (prop, properties, false); } public void AddEvent (Event e) { if (!AddMember (e)) return; if (events == null) events = new List (); events.Add (e); } /// /// Indexer has special handling in constrast to other AddXXX because the name can be driven by IndexerNameAttribute /// public void AddIndexer (Indexer i) { if (indexers == null) indexers = new List (); if (i.IsExplicitImpl) AddMemberToList (i, indexers, true); else AddMemberToList (i, indexers, false); } public void AddOperator (Operator op) { if (!AddMember (op)) return; if (operators == null) operators = new List (); operators.Add (op); } public void AddCompilerGeneratedClass (CompilerGeneratedClass c) { Report.Debug (64, "ADD COMPILER GENERATED CLASS", this, c); if (compiler_generated == null) compiler_generated = new List (); compiler_generated.Add (c); } public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa) { if (a.Type == pa.DefaultMember) { if (Indexers != null) { Report.Error (646, a.Location, "Cannot specify the `DefaultMember' attribute on type containing an indexer"); return; } } if (a.Type == pa.Required) { Report.Error (1608, a.Location, "The RequiredAttribute attribute is not permitted on C# types"); return; } TypeBuilder.SetCustomAttribute ((ConstructorInfo) ctor.GetMetaInfo (), cdata); } public override AttributeTargets AttributeTargets { get { throw new NotSupportedException (); } } public IList Types { get { return types; } } public IList Methods { get { return methods; } } public IList Constants { get { return constants; } } public TypeSpec BaseType { get { return spec.BaseType; } } public IList Fields { get { return fields; } } public IList InstanceConstructors { get { return instance_constructors; } } public IList Properties { get { return properties; } } public IList Events { get { return events; } } public IList Indexers { get { return indexers; } } public IList Operators { get { return operators; } } protected override TypeAttributes TypeAttr { get { return ModifiersExtensions.TypeAttr (ModFlags, IsTopLevel); } } public int TypeParametersCount { get { return MemberName.Arity; } } TypeParameterSpec[] ITypeDefinition.TypeParameters { get { // TODO MemberCache: this is going to hurt return PartialContainer.type_params.Select (l => l.Type).ToArray (); } } public string GetAttributeDefaultMember () { return indexers == null ? DefaultIndexerName : indexer_name; } public bool IsComImport { get { if (OptAttributes == null) return false; return OptAttributes.Contains (Module.PredefinedAttributes.ComImport); } } string ITypeDefinition.Namespace { get { return NamespaceEntry.NS.MemberName.GetSignatureForError (); } } public virtual void RegisterFieldForInitialization (MemberCore field, FieldInitializer expression) { if ((field.ModFlags & Modifiers.STATIC) != 0){ if (initialized_static_fields == null) { PartialContainer.HasStaticFieldInitializer = true; initialized_static_fields = new List (4); } initialized_static_fields.Add (expression); } else { if (initialized_fields == null) initialized_fields = new List (4); initialized_fields.Add (expression); } } public void ResolveFieldInitializers (BlockContext ec) { if (partial_parts != null) { foreach (TypeContainer part in partial_parts) { part.DoResolveFieldInitializers (ec); } } DoResolveFieldInitializers (ec); } void DoResolveFieldInitializers (BlockContext ec) { if (ec.IsStatic) { if (initialized_static_fields == null) return; bool has_complex_initializer = !ec.Module.Compiler.Settings.Optimize; int i; ExpressionStatement [] init = new ExpressionStatement [initialized_static_fields.Count]; for (i = 0; i < initialized_static_fields.Count; ++i) { FieldInitializer fi = initialized_static_fields [i]; ExpressionStatement s = fi.ResolveStatement (ec); if (s == null) { s = EmptyExpressionStatement.Instance; } else if (fi.IsComplexInitializer) { has_complex_initializer |= true; } init [i] = s; } for (i = 0; i < initialized_static_fields.Count; ++i) { FieldInitializer fi = initialized_static_fields [i]; // // Need special check to not optimize code like this // static int a = b = 5; // static int b = 0; // if (!has_complex_initializer && fi.IsDefaultInitializer) continue; ec.CurrentBlock.AddScopeStatement (new StatementExpression (init [i])); } return; } if (initialized_fields == null) return; for (int i = 0; i < initialized_fields.Count; ++i) { FieldInitializer fi = initialized_fields [i]; ExpressionStatement s = fi.ResolveStatement (ec); if (s == null) continue; // // Field is re-initialized to its default value => removed // if (fi.IsDefaultInitializer && ec.Module.Compiler.Settings.Optimize) continue; ec.CurrentBlock.AddScopeStatement (new StatementExpression (s)); } } public override string DocComment { get { return comment; } set { if (value == null) return; comment += value; } } public PendingImplementation PendingImplementations { get { return pending; } } public TypeSpec GetAttributeCoClass () { if (OptAttributes == null) return null; Attribute a = OptAttributes.Search (Module.PredefinedAttributes.CoClass); if (a == null) return null; return a.GetCoClassAttributeValue (); } public AttributeUsageAttribute GetAttributeUsage (PredefinedAttribute pa) { Attribute a = null; if (OptAttributes != null) { a = OptAttributes.Search (pa); } if (a == null) return null; return a.GetAttributeUsageAttribute (); } public virtual void AddBasesForPart (DeclSpace part, List bases) { // FIXME: get rid of partial_parts and store lists of bases of each part here // assumed, not verified: 'part' is in 'partial_parts' ((TypeContainer) part).type_bases = bases; } /// /// This function computes the Base class and also the /// list of interfaces that the class or struct @c implements. /// /// The return value is an array (might be null) of /// interfaces implemented (as Types). /// /// The @base_class argument is set to the base object or null /// if this is `System.Object'. /// protected virtual TypeExpr[] ResolveBaseTypes (out TypeExpr base_class) { base_class = null; if (type_bases == null) return null; int count = type_bases.Count; TypeExpr [] ifaces = null; var base_context = new BaseContext (this); for (int i = 0, j = 0; i < count; i++){ FullNamedExpression fne = type_bases [i]; TypeExpr fne_resolved = fne.ResolveAsTypeTerminal (base_context, false); if (fne_resolved == null) continue; if (i == 0 && Kind == MemberKind.Class && !fne_resolved.Type.IsInterface) { if (fne_resolved.Type == InternalType.Dynamic) { Report.Error (1965, Location, "Class `{0}' cannot derive from the dynamic type", GetSignatureForError ()); continue; } base_type = fne_resolved.Type; base_class = fne_resolved; continue; } if (ifaces == null) ifaces = new TypeExpr [count - i]; if (fne_resolved.Type.IsInterface) { for (int ii = 0; ii < j; ++ii) { if (fne_resolved.Type == ifaces [ii].Type) { Report.Error (528, Location, "`{0}' is already listed in interface list", fne_resolved.GetSignatureForError ()); break; } } if (Kind == MemberKind.Interface && !IsAccessibleAs (fne_resolved.Type)) { Report.Error (61, fne.Location, "Inconsistent accessibility: base interface `{0}' is less accessible than interface `{1}'", fne_resolved.GetSignatureForError (), GetSignatureForError ()); } } else { Report.SymbolRelatedToPreviousError (fne_resolved.Type); if (Kind != MemberKind.Class) { Report.Error (527, fne.Location, "Type `{0}' in interface list is not an interface", fne_resolved.GetSignatureForError ()); } else if (base_class != null) Report.Error (1721, fne.Location, "`{0}': Classes cannot have multiple base classes (`{1}' and `{2}')", GetSignatureForError (), base_class.GetSignatureForError (), fne_resolved.GetSignatureForError ()); else { Report.Error (1722, fne.Location, "`{0}': Base class `{1}' must be specified as first", GetSignatureForError (), fne_resolved.GetSignatureForError ()); } } ifaces [j++] = fne_resolved; } return ifaces; } TypeExpr[] GetNormalPartialBases () { var ifaces = new List (0); if (iface_exprs != null) ifaces.AddRange (iface_exprs); foreach (TypeContainer part in partial_parts) { TypeExpr new_base_class; TypeExpr[] new_ifaces = part.ResolveBaseTypes (out new_base_class); if (new_base_class != null) { if (base_type_expr != null && new_base_class.Type != base_type) { Report.SymbolRelatedToPreviousError (new_base_class.Location, ""); Report.Error (263, part.Location, "Partial declarations of `{0}' must not specify different base classes", part.GetSignatureForError ()); } else { base_type_expr = new_base_class; base_type = base_type_expr.Type; } } if (new_ifaces == null) continue; foreach (TypeExpr iface in new_ifaces) { if (ifaces.Contains (iface)) continue; ifaces.Add (iface); } } if (ifaces.Count == 0) return null; return ifaces.ToArray (); } // // Checks that some operators come in pairs: // == and != // > and < // >= and <= // true and false // // They are matched based on the return type and the argument types // void CheckPairedOperators () { bool has_equality_or_inequality = false; var operators = this.operators.ToArray (); bool[] has_pair = new bool[operators.Length]; for (int i = 0; i < operators.Length; ++i) { if (operators[i] == null) continue; Operator o_a = (Operator) operators[i]; Operator.OpType o_type = o_a.OperatorType; if (o_type == Operator.OpType.Equality || o_type == Operator.OpType.Inequality) has_equality_or_inequality = true; Operator.OpType matching_type = o_a.GetMatchingOperator (); if (matching_type == Operator.OpType.TOP) { operators[i] = null; continue; } for (int ii = 0; ii < operators.Length; ++ii) { Operator o_b = (Operator) operators[ii]; if (o_b == null || o_b.OperatorType != matching_type) continue; if (!TypeSpecComparer.IsEqual (o_a.ReturnType, o_b.ReturnType)) continue; if (!TypeSpecComparer.Equals (o_a.ParameterTypes, o_b.ParameterTypes)) continue; operators[i] = null; // // Used to ignore duplicate user conversions // has_pair[ii] = true; } } for (int i = 0; i < operators.Length; ++i) { if (operators[i] == null || has_pair[i]) continue; Operator o = (Operator) operators [i]; Report.Error (216, o.Location, "The operator `{0}' requires a matching operator `{1}' to also be defined", o.GetSignatureForError (), Operator.GetName (o.GetMatchingOperator ())); } if (has_equality_or_inequality) { if (Methods == null || !HasEquals) Report.Warning (660, 2, Location, "`{0}' defines operator == or operator != but does not override Object.Equals(object o)", GetSignatureForError ()); if (Methods == null || !HasGetHashCode) Report.Warning (661, 2, Location, "`{0}' defines operator == or operator != but does not override Object.GetHashCode()", GetSignatureForError ()); } } bool CreateTypeBuilder () { // // Sets .size to 1 for structs with no instance fields // int type_size = Kind == MemberKind.Struct && first_nonstatic_field == null ? 1 : 0; if (IsTopLevel) { // TODO: Completely wrong if (Module.GlobalRootNamespace.IsNamespace (Name)) { Report.Error (519, Location, "`{0}' clashes with a predefined namespace", Name); } TypeBuilder = Module.CreateBuilder (Name, TypeAttr, type_size); } else { TypeBuilder = Parent.TypeBuilder.DefineNestedType (Basename, TypeAttr, null, type_size); } if (DeclaringAssembly.Importer != null) DeclaringAssembly.Importer.AddCompiledType (TypeBuilder, spec); spec.SetMetaInfo (TypeBuilder); spec.MemberCache = new MemberCache (this); spec.DeclaringType = Parent.CurrentType; if (!IsTopLevel) Parent.MemberCache.AddMember (spec); if (IsGeneric) { string[] param_names = new string[TypeParameters.Length]; for (int i = 0; i < TypeParameters.Length; i++) param_names [i] = TypeParameters[i].Name; all_tp_builders = TypeBuilder.DefineGenericParameters (param_names); int offset = CurrentTypeParametersStartIndex; for (int i = offset; i < all_tp_builders.Length; i++) { CurrentTypeParameters [i - offset].Define (all_tp_builders [i], spec); } } return true; } // // Creates a proxy base method call inside this container for hoisted base member calls // public MethodSpec CreateHoistedBaseCallProxy (ResolveContext rc, MethodSpec method) { Method proxy_method; // // One proxy per base method is enough // if (hoisted_base_call_proxies == null) { hoisted_base_call_proxies = new Dictionary (); proxy_method = null; } else { hoisted_base_call_proxies.TryGetValue (method, out proxy_method); } if (proxy_method == null) { string name = CompilerGeneratedClass.MakeName (method.Name, null, "BaseCallProxy", hoisted_base_call_proxies.Count); var base_parameters = new Parameter[method.Parameters.Count]; for (int i = 0; i < base_parameters.Length; ++i) { var base_param = method.Parameters.FixedParameters[i]; base_parameters[i] = new Parameter (new TypeExpression (method.Parameters.Types[i], Location), base_param.Name, base_param.ModFlags, null, Location); base_parameters[i].Resolve (this, i); } var cloned_params = ParametersCompiled.CreateFullyResolved (base_parameters, method.Parameters.Types); if (method.Parameters.HasArglist) { cloned_params.FixedParameters[0] = new Parameter (null, "__arglist", Parameter.Modifier.NONE, null, Location); cloned_params.Types[0] = Module.PredefinedTypes.RuntimeArgumentHandle.Resolve (Location); } GenericMethod generic_method; MemberName member_name; if (method.IsGeneric) { // // Copy all base generic method type parameters info // var hoisted_tparams = method.GenericDefinition.TypeParameters; var targs = new TypeArguments (); var type_params = new TypeParameter[hoisted_tparams.Length]; for (int i = 0; i < type_params.Length; ++i) { var tp = hoisted_tparams[i]; targs.Add (new TypeParameterName (tp.Name, null, Location)); type_params[i] = new TypeParameter (tp, this, null, new MemberName (tp.Name), null); } member_name = new MemberName (name, targs, Location); generic_method = new GenericMethod (NamespaceEntry, this, member_name, type_params, new TypeExpression (method.ReturnType, Location), cloned_params); } else { member_name = new MemberName (name); generic_method = null; } // Compiler generated proxy proxy_method = new Method (this, generic_method, new TypeExpression (method.ReturnType, Location), Modifiers.PRIVATE | Modifiers.COMPILER_GENERATED | Modifiers.DEBUGGER_HIDDEN, member_name, cloned_params, null); var block = new ToplevelBlock (Compiler, proxy_method.ParameterInfo, Location); var mg = MethodGroupExpr.CreatePredefined (method, method.DeclaringType, Location); mg.InstanceExpression = new BaseThis (method.DeclaringType, Location); // Get all the method parameters and pass them as arguments var real_base_call = new Invocation (mg, block.GetAllParametersArguments ()); Statement statement; if (method.ReturnType == TypeManager.void_type) statement = new StatementExpression (real_base_call); else statement = new Return (real_base_call, Location); block.AddStatement (statement); proxy_method.Block = block; methods.Add (proxy_method); proxy_method.Define (); hoisted_base_call_proxies.Add (method, proxy_method); } return proxy_method.Spec; } bool DefineBaseTypes () { iface_exprs = ResolveBaseTypes (out base_type_expr); if (partial_parts != null) { iface_exprs = GetNormalPartialBases (); } var cycle = CheckRecursiveDefinition (this); if (cycle != null) { Report.SymbolRelatedToPreviousError (cycle); if (this is Interface) { Report.Error (529, Location, "Inherited interface `{0}' causes a cycle in the interface hierarchy of `{1}'", GetSignatureForError (), cycle.GetSignatureForError ()); iface_exprs = null; } else { Report.Error (146, Location, "Circular base class dependency involving `{0}' and `{1}'", GetSignatureForError (), cycle.GetSignatureForError ()); base_type = null; } } if (iface_exprs != null) { foreach (TypeExpr iface in iface_exprs) { // Prevents a crash, the interface might not have been resolved: 442144 if (iface == null) continue; var iface_type = iface.Type; if (!spec.AddInterface (iface_type)) continue; if (iface_type.IsGeneric && spec.Interfaces != null) { foreach (var prev_iface in iface_exprs) { if (prev_iface == iface) break; if (!TypeSpecComparer.Unify.IsEqual (iface_type, prev_iface.Type)) continue; Report.Error (695, Location, "`{0}' cannot implement both `{1}' and `{2}' because they may unify for some type parameter substitutions", GetSignatureForError (), prev_iface.GetSignatureForError (), iface_type.GetSignatureForError ()); } } TypeBuilder.AddInterfaceImplementation (iface_type.GetMetaInfo ()); // Ensure the base is always setup var compiled_iface = iface_type.MemberDefinition as Interface; if (compiled_iface != null) { // TODO: Need DefineBaseType only compiled_iface.DefineType (); } if (iface_type.Interfaces != null) { var base_ifaces = new List (iface_type.Interfaces); for (int i = 0; i < base_ifaces.Count; ++i) { var ii_iface_type = base_ifaces[i]; if (spec.AddInterface (ii_iface_type)) { TypeBuilder.AddInterfaceImplementation (ii_iface_type.GetMetaInfo ()); if (ii_iface_type.Interfaces != null) base_ifaces.AddRange (ii_iface_type.Interfaces); } } } } } if (Kind == MemberKind.Interface) { spec.BaseType = TypeManager.object_type; return true; } if (base_type != null) { spec.BaseType = base_type; // Set base type after type creation TypeBuilder.SetParent (base_type.GetMetaInfo ()); } else { TypeBuilder.SetParent (null); } return true; } public virtual void DefineConstants () { if (constants != null) { foreach (Const c in constants) { c.DefineValue (); } } if (instance_constructors != null) { foreach (MethodCore m in instance_constructors) { var p = m.ParameterInfo; if (!p.IsEmpty) { p.ResolveDefaultValues (m); } } } if (methods != null) { foreach (MethodCore m in methods) { var p = m.ParameterInfo; if (!p.IsEmpty) { p.ResolveDefaultValues (m); } } } if (indexers != null) { foreach (Indexer i in indexers) { i.ParameterInfo.ResolveDefaultValues (i); } } if (types != null) { foreach (var t in types) t.DefineConstants (); } } // // Defines the type in the appropriate ModuleBuilder or TypeBuilder. // public bool CreateType () { if (TypeBuilder != null) return !error; if (error) return false; if (!CreateTypeBuilder ()) { error = true; return false; } if (partial_parts != null) { foreach (TypeContainer part in partial_parts) { part.spec = spec; part.current_type = current_type; part.TypeBuilder = TypeBuilder; } } if (Types != null) { foreach (TypeContainer tc in Types) { tc.CreateType (); } } return true; } public override void DefineType () { if (error) return; if (type_defined) return; type_defined = true; if (!DefineBaseTypes ()) { error = true; return; } if (!DefineNestedTypes ()) { error = true; return; } } public override void SetParameterInfo (List constraints_list) { base.SetParameterInfo (constraints_list); if (PartialContainer.CurrentTypeParameters == null || PartialContainer == this) return; TypeParameter[] tc_names = PartialContainer.CurrentTypeParameters; for (int i = 0; i < tc_names.Length; ++i) { if (tc_names [i].Name != type_params [i].Name) { Report.SymbolRelatedToPreviousError (PartialContainer.Location, ""); Report.Error (264, Location, "Partial declarations of `{0}' must have the same type parameter names in the same order", GetSignatureForError ()); break; } if (tc_names [i].Variance != type_params [i].Variance) { Report.SymbolRelatedToPreviousError (PartialContainer.Location, ""); Report.Error (1067, Location, "Partial declarations of `{0}' must have the same type parameter variance modifiers", GetSignatureForError ()); break; } } } // // Replaces normal spec with predefined one when compiling corlib // and this type container defines predefined type // public void SetPredefinedSpec (BuildinTypeSpec spec) { // When compiling build-in types we start with two // version of same type. One is of BuildinTypeSpec and // second one is ordinary TypeSpec. The unification // happens at later stage when we know which type // really matches the buildin type signature. However // that means TypeSpec create during CreateType of this // type has to be replaced with buildin one // spec.SetMetaInfo (TypeBuilder); spec.MemberCache = this.spec.MemberCache; spec.DeclaringType = this.spec.DeclaringType; this.spec = spec; current_type = null; } void UpdateTypeParameterConstraints (TypeContainer part) { TypeParameter[] current_params = type_params; for (int i = 0; i < current_params.Length; i++) { if (current_params [i].AddPartialConstraints (part, part.type_params [i])) continue; Report.SymbolRelatedToPreviousError (Location, ""); Report.Error (265, part.Location, "Partial declarations of `{0}' have inconsistent constraints for type parameter `{1}'", GetSignatureForError (), current_params [i].GetSignatureForError ()); } } public bool ResolveTypeParameters () { if (!DoResolveTypeParameters ()) return false; if (types != null) { foreach (var type in types) if (!type.ResolveTypeParameters ()) return false; } if (compiler_generated != null) { foreach (CompilerGeneratedClass c in compiler_generated) if (!c.ResolveTypeParameters ()) return false; } return true; } protected virtual bool DoResolveTypeParameters () { if (CurrentTypeParameters == null) return true; if (PartialContainer != this) throw new InternalErrorException (); var base_context = new BaseContext (this); foreach (TypeParameter type_param in CurrentTypeParameters) { if (!type_param.ResolveConstraints (base_context)) { error = true; return false; } } if (partial_parts != null) { foreach (TypeContainer part in partial_parts) UpdateTypeParameterConstraints (part); } return true; } protected virtual bool DefineNestedTypes () { if (Types != null) { foreach (TypeContainer tc in Types) tc.DefineType (); } return true; } TypeSpec CheckRecursiveDefinition (TypeContainer tc) { if (InTransit != null) return spec; InTransit = tc; if (base_type_expr != null) { var ptc = base_type.MemberDefinition as TypeContainer; if (ptc != null && ptc.CheckRecursiveDefinition (this) != null) return base_type; } if (iface_exprs != null) { foreach (TypeExpr iface in iface_exprs) { // the interface might not have been resolved, prevents a crash, see #442144 if (iface == null) continue; var ptc = iface.Type.MemberDefinition as Interface; if (ptc != null && ptc.CheckRecursiveDefinition (this) != null) return iface.Type; } } if (!IsTopLevel && Parent.PartialContainer.CheckRecursiveDefinition (this) != null) return spec; InTransit = null; return null; } /// /// Populates our TypeBuilder with fields and methods /// public sealed override bool Define () { if (members_defined) return members_defined_ok; members_defined_ok = DoDefineMembers (); members_defined = true; if (types != null) { foreach (var nested in types) nested.Define (); } return members_defined_ok; } protected virtual bool DoDefineMembers () { if (iface_exprs != null) { foreach (TypeExpr iface in iface_exprs) { if (iface == null) continue; var iface_type = iface.Type; // Ensure the base is always setup var compiled_iface = iface_type.MemberDefinition as Interface; if (compiled_iface != null) compiled_iface.Define (); if (Kind == MemberKind.Interface) MemberCache.AddInterface (iface_type); ObsoleteAttribute oa = iface_type.GetAttributeObsolete (); if (oa != null && !IsObsolete) AttributeTester.Report_ObsoleteMessage (oa, iface.GetSignatureForError (), Location, Report); GenericTypeExpr ct = iface as GenericTypeExpr; if (ct != null) { // TODO: passing `this' is wrong, should be base type iface instead TypeManager.CheckTypeVariance (ct.Type, Variance.Covariant, this); ct.CheckConstraints (this); if (ct.HasDynamicArguments () && !IsCompilerGenerated) { Report.Error (1966, iface.Location, "`{0}': cannot implement a dynamic interface `{1}'", GetSignatureForError (), iface.GetSignatureForError ()); return false; } } } } if (base_type != null) { ObsoleteAttribute obsolete_attr = base_type.GetAttributeObsolete (); if (obsolete_attr != null && !IsObsolete) AttributeTester.Report_ObsoleteMessage (obsolete_attr, base_type.GetSignatureForError (), Location, Report); var ct = base_type_expr as GenericTypeExpr; if (ct != null) ct.CheckConstraints (this); if (base_type.Interfaces != null) { foreach (var iface in base_type.Interfaces) spec.AddInterface (iface); } var baseContainer = base_type.MemberDefinition as ClassOrStruct; if (baseContainer != null) { baseContainer.Define (); // // It can trigger define of this type (for generic types only) // if (HasMembersDefined) return true; } } if (type_params != null) { foreach (var tp in type_params) { tp.CheckGenericConstraints (); } } DefineContainerMembers (constants); DefineContainerMembers (fields); if (Kind == MemberKind.Struct || Kind == MemberKind.Class) { pending = PendingImplementation.GetPendingImplementations (this); if (requires_delayed_unmanagedtype_check) { requires_delayed_unmanagedtype_check = false; foreach (FieldBase f in fields) { if (f.MemberType != null && f.MemberType.IsPointer) TypeManager.VerifyUnmanaged (Module, f.MemberType, f.Location); } } } // // Constructors are not in the defined_names array // DefineContainerMembers (instance_constructors); DefineContainerMembers (events); DefineContainerMembers (ordered_explicit_member_list); DefineContainerMembers (ordered_member_list); if (operators != null) { DefineContainerMembers (operators); CheckPairedOperators (); } ComputeIndexerName(); CheckEqualsAndGetHashCode(); if (Kind == MemberKind.Interface && iface_exprs != null) { MemberCache.RemoveHiddenMembers (spec); } return true; } protected virtual void DefineContainerMembers (System.Collections.IList mcal) // IList { if (mcal != null) { for (int i = 0; i < mcal.Count; ++i) { MemberCore mc = (MemberCore) mcal[i]; try { mc.Define (); } catch (Exception e) { throw new InternalErrorException (mc, e); } } } } protected virtual void ComputeIndexerName () { if (indexers == null) return; string class_indexer_name = null; // // If there's both an explicit and an implicit interface implementation, the // explicit one actually implements the interface while the other one is just // a normal indexer. See bug #37714. // // Invariant maintained by AddIndexer(): All explicit interface indexers precede normal indexers foreach (Indexer i in indexers) { if (i.InterfaceType != null) { if (seen_normal_indexers) throw new Exception ("Internal Error: 'Indexers' array not sorted properly."); continue; } seen_normal_indexers = true; if (class_indexer_name == null) { class_indexer_name = i.ShortName; continue; } if (i.ShortName != class_indexer_name) Report.Error (668, i.Location, "Two indexers have different names; the IndexerName attribute must be used with the same name on every indexer within a type"); } if (class_indexer_name != null) indexer_name = class_indexer_name; } void EmitIndexerName () { if (!seen_normal_indexers) return; PredefinedAttribute pa = Module.PredefinedAttributes.DefaultMember; if (pa.Constructor == null && !pa.ResolveConstructor (Location, TypeManager.string_type)) return; var encoder = new AttributeEncoder (); encoder.Encode (GetAttributeDefaultMember ()); encoder.EncodeEmptyNamedArguments (); pa.EmitAttribute (TypeBuilder, encoder); } protected virtual void CheckEqualsAndGetHashCode () { if (methods == null) return; if (HasEquals && !HasGetHashCode) { Report.Warning (659, 3, this.Location, "`{0}' overrides Object.Equals(object) but does not override Object.GetHashCode()", this.GetSignatureForError ()); } } // Indicated whether container has StructLayout attribute set Explicit public bool HasExplicitLayout { get { return (caching_flags & Flags.HasExplicitLayout) != 0; } set { caching_flags |= Flags.HasExplicitLayout; } } public bool HasStructLayout { get { return (caching_flags & Flags.HasStructLayout) != 0; } set { caching_flags |= Flags.HasStructLayout; } } public MemberCache MemberCache { get { return spec.MemberCache; } } void CheckMemberUsage (List al, string member_type) { if (al == null) return; foreach (MemberCore mc in al) { if ((mc.ModFlags & Modifiers.AccessibilityMask) != Modifiers.PRIVATE) continue; if (!mc.IsUsed && (mc.caching_flags & Flags.Excluded) == 0) { Report.Warning (169, 3, mc.Location, "The private {0} `{1}' is never used", member_type, mc.GetSignatureForError ()); } } } public virtual void VerifyMembers () { // // Check for internal or private fields that were never assigned // if (Report.WarningLevel >= 3) { if (Compiler.Settings.EnhancedWarnings) { CheckMemberUsage (properties, "property"); CheckMemberUsage (methods, "method"); CheckMemberUsage (constants, "constant"); } if (fields != null){ bool is_type_exposed = Kind == MemberKind.Struct || IsExposedFromAssembly (); foreach (FieldBase f in fields) { if ((f.ModFlags & Modifiers.AccessibilityMask) != Modifiers.PRIVATE) { if (is_type_exposed) continue; f.SetIsUsed (); } if (!f.IsUsed){ if ((f.caching_flags & Flags.IsAssigned) == 0) Report.Warning (169, 3, f.Location, "The private field `{0}' is never used", f.GetSignatureForError ()); else { Report.Warning (414, 3, f.Location, "The private field `{0}' is assigned but its value is never used", f.GetSignatureForError ()); } continue; } // // Only report 649 on level 4 // if (Report.WarningLevel < 4) continue; if ((f.caching_flags & Flags.IsAssigned) != 0) continue; // // Don't be pendatic over serializable attributes // if (f.OptAttributes != null || PartialContainer.HasStructLayout) continue; Constant c = New.Constantify (f.MemberType, f.Location); Report.Warning (649, 4, f.Location, "Field `{0}' is never assigned to, and will always have its default value `{1}'", f.GetSignatureForError (), c == null ? "null" : c.GetValueAsLiteral ()); } } } } public override void Emit () { if (!IsTopLevel) { MemberSpec candidate; var conflict_symbol = MemberCache.FindBaseMember (this, out candidate); if (conflict_symbol == null && candidate == null) { if ((ModFlags & Modifiers.NEW) != 0) Report.Warning (109, 4, Location, "The member `{0}' does not hide an inherited member. The new keyword is not required", GetSignatureForError ()); } else { if ((ModFlags & Modifiers.NEW) == 0) { if (candidate == null) candidate = conflict_symbol; Report.SymbolRelatedToPreviousError (candidate); Report.Warning (108, 2, Location, "`{0}' hides inherited member `{1}'. Use the new keyword if hiding was intended", GetSignatureForError (), candidate.GetSignatureForError ()); } } } if (all_tp_builders != null) { int current_starts_index = CurrentTypeParametersStartIndex; for (int i = 0; i < all_tp_builders.Length; i++) { if (i < current_starts_index) { TypeParameters[i].EmitConstraints (all_tp_builders [i]); } else { CurrentTypeParameters [i - current_starts_index].Emit (); } } } if ((ModFlags & Modifiers.COMPILER_GENERATED) != 0 && !Parent.IsCompilerGenerated) Module.PredefinedAttributes.CompilerGenerated.EmitAttribute (TypeBuilder); #if STATIC if ((TypeBuilder.Attributes & TypeAttributes.StringFormatMask) == 0 && Module.HasDefaultCharSet) TypeBuilder.__SetAttributes (TypeBuilder.Attributes | Module.DefaultCharSetType); #endif base.Emit (); } // TODO: move to ClassOrStruct void EmitConstructors () { if (instance_constructors == null) return; if (spec.IsAttribute && IsExposedFromAssembly () && Compiler.Settings.VerifyClsCompliance && IsClsComplianceRequired ()) { bool has_compliant_args = false; foreach (Constructor c in instance_constructors) { try { c.Emit (); } catch (Exception e) { throw new InternalErrorException (c, e); } if (has_compliant_args) continue; has_compliant_args = c.HasCompliantArgs; } if (!has_compliant_args) Report.Warning (3015, 1, Location, "`{0}' has no accessible constructors which use only CLS-compliant types", GetSignatureForError ()); } else { foreach (Constructor c in instance_constructors) { try { c.Emit (); } catch (Exception e) { throw new InternalErrorException (c, e); } } } } /// /// Emits the code, this step is performed after all /// the types, enumerations, constructors /// public virtual void EmitType () { if (OptAttributes != null) OptAttributes.Emit (); Emit (); EmitConstructors (); if (constants != null) foreach (Const con in constants) con.Emit (); if (default_static_constructor != null) default_static_constructor.Emit (); if (operators != null) foreach (Operator o in operators) o.Emit (); if (properties != null) foreach (Property p in properties) p.Emit (); if (indexers != null) { foreach (Indexer indx in indexers) indx.Emit (); EmitIndexerName (); } if (events != null){ foreach (Event e in Events) e.Emit (); } if (methods != null) { for (int i = 0; i < methods.Count; ++i) ((MethodOrOperator) methods [i]).Emit (); } if (fields != null) foreach (FieldBase f in fields) f.Emit (); if (types != null) { foreach (TypeContainer t in types) t.EmitType (); } if (pending != null) pending.VerifyPendingMethods (Report); if (Report.Errors > 0) return; if (compiler_generated != null) { for (int i = 0; i < compiler_generated.Count; ++i) compiler_generated [i].EmitType (); } } public virtual void CloseType () { if ((caching_flags & Flags.CloseTypeCreated) != 0) return; // Close base type container first to avoid TypeLoadException if (spec.BaseType != null) { var btype = spec.BaseType.MemberDefinition as TypeContainer; if (btype != null) { btype.CloseType (); if ((caching_flags & Flags.CloseTypeCreated) != 0) return; } } try { caching_flags |= Flags.CloseTypeCreated; TypeBuilder.CreateType (); } catch (TypeLoadException){ // // This is fine, the code still created the type // // Report.Warning (-20, "Exception while creating class: " + TypeBuilder.Name); // Console.WriteLine (e.Message); } catch (Exception e) { throw new InternalErrorException (this, e); } if (Types != null){ foreach (TypeContainer tc in Types) tc.CloseType (); } if (compiler_generated != null) foreach (CompilerGeneratedClass c in compiler_generated) c.CloseType (); types = null; initialized_fields = null; initialized_static_fields = null; constants = null; ordered_explicit_member_list = null; ordered_member_list = null; methods = null; events = null; indexers = null; operators = null; compiler_generated = null; default_constructor = null; default_static_constructor = null; type_bases = null; OptAttributes = null; } // // Performs the validation on a Method's modifiers (properties have // the same properties). // // TODO: Why is it not done at parse stage ? // public bool MethodModifiersValid (MemberCore mc) { const Modifiers vao = (Modifiers.VIRTUAL | Modifiers.ABSTRACT | Modifiers.OVERRIDE); const Modifiers nv = (Modifiers.NEW | Modifiers.VIRTUAL); bool ok = true; var flags = mc.ModFlags; // // At most one of static, virtual or override // if ((flags & Modifiers.STATIC) != 0){ if ((flags & vao) != 0){ Report.Error (112, mc.Location, "A static member `{0}' cannot be marked as override, virtual or abstract", mc.GetSignatureForError ()); ok = false; } } if ((flags & Modifiers.OVERRIDE) != 0 && (flags & nv) != 0){ Report.Error (113, mc.Location, "A member `{0}' marked as override cannot be marked as new or virtual", mc.GetSignatureForError ()); ok = false; } // // If the declaration includes the abstract modifier, then the // declaration does not include static, virtual or extern // if ((flags & Modifiers.ABSTRACT) != 0){ if ((flags & Modifiers.EXTERN) != 0){ Report.Error ( 180, mc.Location, "`{0}' cannot be both extern and abstract", mc.GetSignatureForError ()); ok = false; } if ((flags & Modifiers.SEALED) != 0) { Report.Error (502, mc.Location, "`{0}' cannot be both abstract and sealed", mc.GetSignatureForError ()); ok = false; } if ((flags & Modifiers.VIRTUAL) != 0){ Report.Error (503, mc.Location, "The abstract method `{0}' cannot be marked virtual", mc.GetSignatureForError ()); ok = false; } if ((ModFlags & Modifiers.ABSTRACT) == 0){ Report.SymbolRelatedToPreviousError (this); Report.Error (513, mc.Location, "`{0}' is abstract but it is declared in the non-abstract class `{1}'", mc.GetSignatureForError (), GetSignatureForError ()); ok = false; } } if ((flags & Modifiers.PRIVATE) != 0){ if ((flags & vao) != 0){ Report.Error (621, mc.Location, "`{0}': virtual or abstract members cannot be private", mc.GetSignatureForError ()); ok = false; } } if ((flags & Modifiers.SEALED) != 0){ if ((flags & Modifiers.OVERRIDE) == 0){ Report.Error (238, mc.Location, "`{0}' cannot be sealed because it is not an override", mc.GetSignatureForError ()); ok = false; } } return ok; } public Constructor DefaultStaticConstructor { get { return default_static_constructor; } } protected override bool VerifyClsCompliance () { if (!base.VerifyClsCompliance ()) return false; // Check this name against other containers NamespaceEntry.NS.VerifyClsCompliance (); // Check all container names for user classes if (Kind != MemberKind.Delegate) MemberCache.VerifyClsCompliance (Definition, Report); if (BaseType != null && !BaseType.IsCLSCompliant ()) { Report.Warning (3009, 1, Location, "`{0}': base type `{1}' is not CLS-compliant", GetSignatureForError (), BaseType.GetSignatureForError ()); } return true; } /// /// Performs checks for an explicit interface implementation. First it /// checks whether the `interface_type' is a base inteface implementation. /// Then it checks whether `name' exists in the interface type. /// public bool VerifyImplements (InterfaceMemberBase mb) { var ifaces = spec.Interfaces; if (ifaces != null) { foreach (TypeSpec t in ifaces){ if (t == mb.InterfaceType) return true; } } Report.SymbolRelatedToPreviousError (mb.InterfaceType); Report.Error (540, mb.Location, "`{0}': containing type does not implement interface `{1}'", mb.GetSignatureForError (), TypeManager.CSharpName (mb.InterfaceType)); return false; } // // Used for visiblity checks to tests whether this definition shares // base type baseType, it does member-definition search // public bool IsBaseTypeDefinition (TypeSpec baseType) { // RootContext check if (TypeBuilder == null) return false; var type = spec; do { if (type.MemberDefinition == baseType.MemberDefinition) return true; type = type.BaseType; } while (type != null); return false; } bool ITypeDefinition.IsInternalAsPublic (IAssemblyDefinition assembly) { return Module.DeclaringAssembly == assembly; } public void LoadMembers (TypeSpec declaringType, bool onlyTypes, ref MemberCache cache) { throw new NotSupportedException ("Not supported for compiled definition " + GetSignatureForError ()); } // // Public function used to locate types. // // Set 'ignore_cs0104' to true if you want to ignore cs0104 errors. // // Returns: Type or null if they type can not be found. // public override FullNamedExpression LookupNamespaceOrType (string name, int arity, Location loc, bool ignore_cs0104) { FullNamedExpression e; if (arity == 0 && Cache.TryGetValue (name, out e)) return e; e = null; int errors = Report.Errors; if (arity == 0) { TypeParameter[] tp = CurrentTypeParameters; if (tp != null) { TypeParameter tparam = TypeParameter.FindTypeParameter (tp, name); if (tparam != null) e = new TypeParameterExpr (tparam, Location.Null); } } if (e == null) { TypeSpec t = LookupNestedTypeInHierarchy (name, arity); if (t != null) e = new TypeExpression (t, Location.Null); else if (Parent != null) { e = Parent.LookupNamespaceOrType (name, arity, loc, ignore_cs0104); } else e = NamespaceEntry.LookupNamespaceOrType (name, arity, loc, ignore_cs0104); } // TODO MemberCache: How to cache arity stuff ? if (errors == Report.Errors && arity == 0) Cache[name] = e; return e; } TypeSpec LookupNestedTypeInHierarchy (string name, int arity) { // TODO: GenericMethod only if (PartialContainer == null) return null; // Has any nested type // Does not work, because base type can have //if (PartialContainer.Types == null) // return null; var container = PartialContainer.CurrentType; // Is not Root container if (container == null) return null; var t = MemberCache.FindNestedType (container, name, arity); if (t == null) return null; // FIXME: Breaks error reporting if (!t.IsAccessible (CurrentType)) return null; return t; } public void Mark_HasEquals () { cached_method |= CachedMethods.Equals; } public void Mark_HasGetHashCode () { cached_method |= CachedMethods.GetHashCode; } /// /// Method container contains Equals method /// public bool HasEquals { get { return (cached_method & CachedMethods.Equals) != 0; } } /// /// Method container contains GetHashCode method /// public bool HasGetHashCode { get { return (cached_method & CachedMethods.GetHashCode) != 0; } } public bool HasStaticFieldInitializer { get { return (cached_method & CachedMethods.HasStaticFieldInitializer) != 0; } set { if (value) cached_method |= CachedMethods.HasStaticFieldInitializer; else cached_method &= ~CachedMethods.HasStaticFieldInitializer; } } // // Generates xml doc comments (if any), and if required, // handle warning report. // internal override void GenerateDocComment (DeclSpace ds) { DocUtil.GenerateTypeDocComment (this, ds, Report); } public override string DocCommentHeader { get { return "T:"; } } } public abstract class ClassOrStruct : TypeContainer { SecurityType declarative_security; public ClassOrStruct (NamespaceEntry ns, DeclSpace parent, MemberName name, Attributes attrs, MemberKind kind) : base (ns, parent, name, attrs, kind) { } protected override bool AddToContainer (MemberCore symbol, string name) { if (!(symbol is Constructor) && symbol.MemberName.Name == MemberName.Name) { if (symbol is TypeParameter) { Report.Error (694, symbol.Location, "Type parameter `{0}' has same name as containing type, or method", symbol.GetSignatureForError ()); return false; } InterfaceMemberBase imb = symbol as InterfaceMemberBase; if (imb == null || !imb.IsExplicitImpl) { Report.SymbolRelatedToPreviousError (this); Report.Error (542, symbol.Location, "`{0}': member names cannot be the same as their enclosing type", symbol.GetSignatureForError ()); return false; } } return base.AddToContainer (symbol, name); } public override void VerifyMembers () { base.VerifyMembers (); if ((events != null) && Report.WarningLevel >= 3) { foreach (Event e in events){ // Note: The event can be assigned from same class only, so we can report // this warning for all accessibility modes if ((e.caching_flags & Flags.IsUsed) == 0) Report.Warning (67, 3, e.Location, "The event `{0}' is never used", e.GetSignatureForError ()); } } if (types != null) { foreach (var t in types) t.VerifyMembers (); } } public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa) { if (a.IsValidSecurityAttribute ()) { a.ExtractSecurityPermissionSet (ctor, ref declarative_security); return; } if (a.Type == pa.StructLayout) { PartialContainer.HasStructLayout = true; if (a.IsExplicitLayoutKind ()) PartialContainer.HasExplicitLayout = true; } if (a.Type == pa.Dynamic) { a.Error_MisusedDynamicAttribute (); return; } base.ApplyAttributeBuilder (a, ctor, cdata, pa); } /// /// Defines the default constructors /// protected void DefineDefaultConstructor (bool is_static) { // The default instance constructor is public // If the class is abstract, the default constructor is protected // The default static constructor is private Modifiers mods; if (is_static) { mods = Modifiers.STATIC | Modifiers.PRIVATE; } else { mods = ((ModFlags & Modifiers.ABSTRACT) != 0) ? Modifiers.PROTECTED : Modifiers.PUBLIC; } Constructor c = new Constructor (this, MemberName.Name, mods, null, ParametersCompiled.EmptyReadOnlyParameters, new GeneratedBaseInitializer (Location), Location); AddConstructor (c); c.Block = new ToplevelBlock (Compiler, ParametersCompiled.EmptyReadOnlyParameters, Location); } protected override bool DoDefineMembers () { CheckProtectedModifier (); base.DoDefineMembers (); if (default_static_constructor != null) default_static_constructor.Define (); return true; } public override void Emit () { if (default_static_constructor == null && PartialContainer.HasStaticFieldInitializer) { DefineDefaultConstructor (true); default_static_constructor.Define (); } base.Emit (); if (declarative_security != null) { foreach (var de in declarative_security) { #if STATIC TypeBuilder.__AddDeclarativeSecurity (de); #else TypeBuilder.AddDeclarativeSecurity (de.Key, de.Value); #endif } } } public override IList LookupExtensionMethod (TypeSpec extensionType, string name, int arity, ref NamespaceEntry scope) { DeclSpace top_level = Parent; if (top_level != null) { while (top_level.Parent != null) top_level = top_level.Parent; var candidates = NamespaceEntry.NS.LookupExtensionMethod (extensionType, this, name, arity); if (candidates != null) { scope = NamespaceEntry; return candidates; } } return NamespaceEntry.LookupExtensionMethod (extensionType, name, arity, ref scope); } protected override TypeAttributes TypeAttr { get { if (default_static_constructor == null) return base.TypeAttr | TypeAttributes.BeforeFieldInit; return base.TypeAttr; } } } // TODO: should be sealed public class Class : ClassOrStruct { const Modifiers AllowedModifiers = Modifiers.NEW | Modifiers.PUBLIC | Modifiers.PROTECTED | Modifiers.INTERNAL | Modifiers.PRIVATE | Modifiers.ABSTRACT | Modifiers.SEALED | Modifiers.STATIC | Modifiers.UNSAFE; public const TypeAttributes StaticClassAttribute = TypeAttributes.Abstract | TypeAttributes.Sealed; public Class (NamespaceEntry ns, DeclSpace parent, MemberName name, Modifiers mod, Attributes attrs) : base (ns, parent, name, attrs, MemberKind.Class) { var accmods = (Parent == null || Parent.Parent == null) ? Modifiers.INTERNAL : Modifiers.PRIVATE; this.ModFlags = ModifiersExtensions.Check (AllowedModifiers, mod, accmods, Location, Report); spec = new TypeSpec (Kind, null, this, null, ModFlags); } public override void Accept (StructuralVisitor visitor) { visitor.Visit (this); } public override void AddBasesForPart (DeclSpace part, List bases) { if (part.Name == "System.Object") Report.Error (537, part.Location, "The class System.Object cannot have a base class or implement an interface."); base.AddBasesForPart (part, bases); } public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa) { if (a.Type == pa.AttributeUsage) { if (!BaseType.IsAttribute && spec != TypeManager.attribute_type) { Report.Error (641, a.Location, "Attribute `{0}' is only valid on classes derived from System.Attribute", a.GetSignatureForError ()); } } if (a.Type == pa.Conditional && !BaseType.IsAttribute) { Report.Error (1689, a.Location, "Attribute `System.Diagnostics.ConditionalAttribute' is only valid on methods or attribute classes"); return; } if (a.Type == pa.ComImport && !attributes.Contains (pa.Guid)) { a.Error_MissingGuidAttribute (); return; } if (a.Type == pa.Extension) { a.Error_MisusedExtensionAttribute (); return; } if (a.Type.IsConditionallyExcluded (Location)) return; base.ApplyAttributeBuilder (a, ctor, cdata, pa); } public override AttributeTargets AttributeTargets { get { return AttributeTargets.Class; } } protected override void DefineContainerMembers (System.Collections.IList list) { if (list == null) return; if (!IsStatic) { base.DefineContainerMembers (list); return; } foreach (MemberCore m in list) { if (m is Operator) { Report.Error (715, m.Location, "`{0}': Static classes cannot contain user-defined operators", m.GetSignatureForError ()); continue; } if (m is Destructor) { Report.Error (711, m.Location, "`{0}': Static classes cannot contain destructor", GetSignatureForError ()); continue; } if (m is Indexer) { Report.Error (720, m.Location, "`{0}': cannot declare indexers in a static class", m.GetSignatureForError ()); continue; } if ((m.ModFlags & Modifiers.STATIC) != 0 || m is Enum || m is Delegate) continue; if (m is Constructor) { Report.Error (710, m.Location, "`{0}': Static classes cannot have instance constructors", GetSignatureForError ()); continue; } Method method = m as Method; if (method != null && method.ParameterInfo.HasExtensionMethodType) { Report.Error (1105, m.Location, "`{0}': Extension methods must be declared static", m.GetSignatureForError ()); continue; } Report.Error (708, m.Location, "`{0}': cannot declare instance members in a static class", m.GetSignatureForError ()); } base.DefineContainerMembers (list); } protected override bool DoDefineMembers () { if ((ModFlags & Modifiers.ABSTRACT) == Modifiers.ABSTRACT && (ModFlags & (Modifiers.SEALED | Modifiers.STATIC)) != 0) { Report.Error (418, Location, "`{0}': an abstract class cannot be sealed or static", GetSignatureForError ()); } if ((ModFlags & (Modifiers.SEALED | Modifiers.STATIC)) == (Modifiers.SEALED | Modifiers.STATIC)) { Report.Error (441, Location, "`{0}': a class cannot be both static and sealed", GetSignatureForError ()); } if (InstanceConstructors == null && !IsStatic) DefineDefaultConstructor (false); return base.DoDefineMembers (); } public override void Emit () { base.Emit (); if ((ModFlags & Modifiers.METHOD_EXTENSION) != 0) Module.PredefinedAttributes.Extension.EmitAttribute (TypeBuilder); if (base_type != null && base_type.HasDynamicElement) { Module.PredefinedAttributes.Dynamic.EmitAttribute (TypeBuilder, base_type, Location); } } protected override TypeExpr[] ResolveBaseTypes (out TypeExpr base_class) { TypeExpr[] ifaces = base.ResolveBaseTypes (out base_class); if (base_class == null) { if (spec != TypeManager.object_type) base_type = TypeManager.object_type; } else { if (base_type.IsGenericParameter){ Report.Error (689, base_class.Location, "`{0}': Cannot derive from type parameter `{1}'", GetSignatureForError (), base_type.GetSignatureForError ()); } else if (IsGeneric && base_type.IsAttribute) { Report.Error (698, base_class.Location, "A generic type cannot derive from `{0}' because it is an attribute class", base_class.GetSignatureForError ()); } else if (base_type.IsStatic) { Report.SymbolRelatedToPreviousError (base_class.Type); Report.Error (709, Location, "`{0}': Cannot derive from static class `{1}'", GetSignatureForError (), base_type.GetSignatureForError ()); } else if (base_type.IsSealed) { Report.SymbolRelatedToPreviousError (base_class.Type); Report.Error (509, Location, "`{0}': cannot derive from sealed type `{1}'", GetSignatureForError (), base_type.GetSignatureForError ()); } else if (PartialContainer.IsStatic && base_class.Type != TypeManager.object_type) { Report.Error (713, Location, "Static class `{0}' cannot derive from type `{1}'. Static classes must derive from object", GetSignatureForError (), base_class.GetSignatureForError ()); } if (base_type is BuildinTypeSpec && !(spec is BuildinTypeSpec) && (base_type == TypeManager.enum_type || base_type == TypeManager.value_type || base_type == TypeManager.multicast_delegate_type || base_type == TypeManager.delegate_type || base_type == TypeManager.array_type)) { Report.Error (644, Location, "`{0}' cannot derive from special class `{1}'", GetSignatureForError (), base_type.GetSignatureForError ()); base_type = TypeManager.object_type; } if (!IsAccessibleAs (base_type)) { Report.SymbolRelatedToPreviousError (base_type); Report.Error (60, Location, "Inconsistent accessibility: base class `{0}' is less accessible than class `{1}'", base_type.GetSignatureForError (), GetSignatureForError ()); } } if (PartialContainer.IsStatic && ifaces != null) { foreach (TypeExpr t in ifaces) Report.SymbolRelatedToPreviousError (t.Type); Report.Error (714, Location, "Static class `{0}' cannot implement interfaces", GetSignatureForError ()); } return ifaces; } /// Search for at least one defined condition in ConditionalAttribute of attribute class /// Valid only for attribute classes. public override string[] ConditionalConditions () { if ((caching_flags & (Flags.Excluded_Undetected | Flags.Excluded)) == 0) return null; caching_flags &= ~Flags.Excluded_Undetected; if (OptAttributes == null) return null; Attribute[] attrs = OptAttributes.SearchMulti (Module.PredefinedAttributes.Conditional); if (attrs == null) return null; string[] conditions = new string[attrs.Length]; for (int i = 0; i < conditions.Length; ++i) conditions[i] = attrs[i].GetConditionalAttributeValue (); caching_flags |= Flags.Excluded; return conditions; } // // FIXME: How do we deal with the user specifying a different // layout? // protected override TypeAttributes TypeAttr { get { TypeAttributes ta = base.TypeAttr | TypeAttributes.AutoLayout | TypeAttributes.Class; if (IsStatic) ta |= StaticClassAttribute; return ta; } } } public sealed class Struct : ClassOrStruct { bool is_unmanaged, has_unmanaged_check_done; bool InTransit; // // Modifiers allowed in a struct declaration // const Modifiers AllowedModifiers = Modifiers.NEW | Modifiers.PUBLIC | Modifiers.PROTECTED | Modifiers.INTERNAL | Modifiers.UNSAFE | Modifiers.PRIVATE; public Struct (NamespaceEntry ns, DeclSpace parent, MemberName name, Modifiers mod, Attributes attrs) : base (ns, parent, name, attrs, MemberKind.Struct) { var accmods = parent.Parent == null ? Modifiers.INTERNAL : Modifiers.PRIVATE; this.ModFlags = ModifiersExtensions.Check (AllowedModifiers, mod, accmods, Location, Report) | Modifiers.SEALED ; spec = new TypeSpec (Kind, null, this, null, ModFlags); } public override AttributeTargets AttributeTargets { get { return AttributeTargets.Struct; } } public override void Accept (StructuralVisitor visitor) { visitor.Visit (this); } public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa) { base.ApplyAttributeBuilder (a, ctor, cdata, pa); // // When struct constains fixed fixed and struct layout has explicitly // set CharSet, its value has to be propagated to compiler generated // fixed types // if (a.Type == pa.StructLayout && Fields != null) { var value = a.GetNamedValue ("CharSet"); if (value == null) return; for (int i = 0; i < Fields.Count; ++i) { FixedField ff = Fields [i] as FixedField; if (ff == null) continue; ff.CharSet = (CharSet) System.Enum.Parse (typeof (CharSet), value.GetValue ().ToString ()); } } } bool CheckStructCycles (Struct s) { if (s.Fields == null) return true; if (s.InTransit) return false; s.InTransit = true; foreach (FieldBase field in s.Fields) { TypeSpec ftype = field.Spec.MemberType; if (!ftype.IsStruct) continue; if (ftype is BuildinTypeSpec) continue; foreach (var targ in ftype.TypeArguments) { if (!CheckFieldTypeCycle (targ)) { Report.Error (523, field.Location, "Struct member `{0}' of type `{1}' causes a cycle in the struct layout", field.GetSignatureForError (), ftype.GetSignatureForError ()); break; } } if ((field.IsStatic && (!ftype.IsGeneric || ftype == CurrentType))) continue; if (!CheckFieldTypeCycle (ftype)) { Report.Error (523, field.Location, "Struct member `{0}' of type `{1}' causes a cycle in the struct layout", field.GetSignatureForError (), ftype.GetSignatureForError ()); break; } } s.InTransit = false; return true; } bool CheckFieldTypeCycle (TypeSpec ts) { var fts = ts.MemberDefinition as Struct; if (fts == null) return true; return CheckStructCycles (fts); } public override void Emit () { CheckStructCycles (this); base.Emit (); } public override bool IsUnmanagedType () { if (fields == null) return true; if (has_unmanaged_check_done) return is_unmanaged; if (requires_delayed_unmanagedtype_check) return true; requires_delayed_unmanagedtype_check = true; foreach (FieldBase f in fields) { if (f.IsStatic) continue; // It can happen when recursive unmanaged types are defined // struct S { S* s; } TypeSpec mt = f.MemberType; if (mt == null) { return true; } while (mt.IsPointer) mt = TypeManager.GetElementType (mt); if (mt.IsGenericOrParentIsGeneric || mt.IsGenericParameter) { has_unmanaged_check_done = true; return false; } if (TypeManager.IsUnmanagedType (mt)) continue; has_unmanaged_check_done = true; return false; } has_unmanaged_check_done = true; is_unmanaged = true; return true; } protected override TypeExpr[] ResolveBaseTypes (out TypeExpr base_class) { TypeExpr[] ifaces = base.ResolveBaseTypes (out base_class); base_type = TypeManager.value_type; return ifaces; } protected override TypeAttributes TypeAttr { get { const TypeAttributes DefaultTypeAttributes = TypeAttributes.SequentialLayout | TypeAttributes.Sealed; return base.TypeAttr | DefaultTypeAttributes; } } public override void RegisterFieldForInitialization (MemberCore field, FieldInitializer expression) { if ((field.ModFlags & Modifiers.STATIC) == 0) { Report.Error (573, field.Location, "`{0}': Structs cannot have instance field initializers", field.GetSignatureForError ()); return; } base.RegisterFieldForInitialization (field, expression); } } /// /// Interfaces /// public sealed class Interface : TypeContainer { /// /// Modifiers allowed in a class declaration /// public const Modifiers AllowedModifiers = Modifiers.NEW | Modifiers.PUBLIC | Modifiers.PROTECTED | Modifiers.INTERNAL | Modifiers.UNSAFE | Modifiers.PRIVATE; public Interface (NamespaceEntry ns, DeclSpace parent, MemberName name, Modifiers mod, Attributes attrs) : base (ns, parent, name, attrs, MemberKind.Interface) { var accmods = parent.Parent == null ? Modifiers.INTERNAL : Modifiers.PRIVATE; this.ModFlags = ModifiersExtensions.Check (AllowedModifiers, mod, accmods, name.Location, Report); spec = new TypeSpec (Kind, null, this, null, ModFlags); } #region Properties public override AttributeTargets AttributeTargets { get { return AttributeTargets.Interface; } } protected override TypeAttributes TypeAttr { get { const TypeAttributes DefaultTypeAttributes = TypeAttributes.AutoLayout | TypeAttributes.Abstract | TypeAttributes.Interface; return base.TypeAttr | DefaultTypeAttributes; } } #endregion public override void Accept (StructuralVisitor visitor) { visitor.Visit (this); } public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa) { if (a.Type == pa.ComImport && !attributes.Contains (pa.Guid)) { a.Error_MissingGuidAttribute (); return; } base.ApplyAttributeBuilder (a, ctor, cdata, pa); } protected override bool VerifyClsCompliance () { if (!base.VerifyClsCompliance ()) return false; if (iface_exprs != null) { foreach (var iface in iface_exprs) { if (iface.Type.IsCLSCompliant ()) continue; Report.SymbolRelatedToPreviousError (iface.Type); Report.Warning (3027, 1, Location, "`{0}' is not CLS-compliant because base interface `{1}' is not CLS-compliant", GetSignatureForError (), TypeManager.CSharpName (iface.Type)); } } return true; } } public abstract class InterfaceMemberBase : MemberBase { // // Common modifiers allowed in a class declaration // protected const Modifiers AllowedModifiersClass = Modifiers.NEW | Modifiers.PUBLIC | Modifiers.PROTECTED | Modifiers.INTERNAL | Modifiers.PRIVATE | Modifiers.STATIC | Modifiers.VIRTUAL | Modifiers.SEALED | Modifiers.OVERRIDE | Modifiers.ABSTRACT | Modifiers.UNSAFE | Modifiers.EXTERN; // // Common modifiers allowed in a struct declaration // protected const Modifiers AllowedModifiersStruct = Modifiers.NEW | Modifiers.PUBLIC | Modifiers.PROTECTED | Modifiers.INTERNAL | Modifiers.PRIVATE | Modifiers.STATIC | Modifiers.OVERRIDE | Modifiers.UNSAFE | Modifiers.EXTERN; // // Common modifiers allowed in a interface declaration // protected const Modifiers AllowedModifiersInterface = Modifiers.NEW | Modifiers.UNSAFE; // // Whether this is an interface member. // public bool IsInterface; // // If true, this is an explicit interface implementation // public bool IsExplicitImpl; protected bool is_external_implementation; // // The interface type we are explicitly implementing // public TypeSpec InterfaceType; // // The method we're overriding if this is an override method. // protected MethodSpec base_method; readonly Modifiers explicit_mod_flags; public MethodAttributes flags; public InterfaceMemberBase (DeclSpace parent, GenericMethod generic, FullNamedExpression type, Modifiers mod, Modifiers allowed_mod, MemberName name, Attributes attrs) : base (parent, generic, type, mod, allowed_mod, Modifiers.PRIVATE, name, attrs) { IsInterface = parent.PartialContainer.Kind == MemberKind.Interface; IsExplicitImpl = (MemberName.Left != null); explicit_mod_flags = mod; } protected override bool CheckBase () { if (!base.CheckBase ()) return false; if ((caching_flags & Flags.MethodOverloadsExist) != 0) CheckForDuplications (); if (IsExplicitImpl) return true; // For System.Object only if (Parent.BaseType == null) return true; MemberSpec candidate; var base_member = FindBaseMember (out candidate); if ((ModFlags & Modifiers.OVERRIDE) != 0) { if (base_member == null) { if (candidate == null) { if (this is Method && ((Method)this).ParameterInfo.IsEmpty && MemberName.Name == Destructor.MetadataName && MemberName.Arity == 0) { Report.Error (249, Location, "Do not override `{0}'. Use destructor syntax instead", "object.Finalize()"); } else { Report.Error (115, Location, "`{0}' is marked as an override but no suitable {1} found to override", GetSignatureForError (), SimpleName.GetMemberType (this)); } } else { Report.SymbolRelatedToPreviousError (candidate); if (this is Event) Report.Error (72, Location, "`{0}': cannot override because `{1}' is not an event", GetSignatureForError (), TypeManager.GetFullNameSignature (candidate)); else if (this is PropertyBase) Report.Error (544, Location, "`{0}': cannot override because `{1}' is not a property", GetSignatureForError (), TypeManager.GetFullNameSignature (candidate)); else Report.Error (505, Location, "`{0}': cannot override because `{1}' is not a method", GetSignatureForError (), TypeManager.GetFullNameSignature (candidate)); } return false; } if (!CheckOverrideAgainstBase (base_member)) return false; ObsoleteAttribute oa = base_member.GetAttributeObsolete (); if (oa != null) { if (OptAttributes == null || !OptAttributes.Contains (Module.PredefinedAttributes.Obsolete)) { Report.SymbolRelatedToPreviousError (base_member); Report.Warning (672, 1, Location, "Member `{0}' overrides obsolete member `{1}'. Add the Obsolete attribute to `{0}'", GetSignatureForError (), TypeManager.GetFullNameSignature (base_member)); } } else { if (OptAttributes != null && OptAttributes.Contains (Module.PredefinedAttributes.Obsolete)) { Report.SymbolRelatedToPreviousError (base_member); Report.Warning (809, 1, Location, "Obsolete member `{0}' overrides non-obsolete member `{1}'", GetSignatureForError (), TypeManager.GetFullNameSignature (base_member)); } } base_method = base_member as MethodSpec; return true; } if (base_member == null && candidate != null && (!(candidate is IParametersMember) || !(this is IParametersMember))) base_member = candidate; if (base_member == null) { if ((ModFlags & Modifiers.NEW) != 0) { if (base_member == null) { Report.Warning (109, 4, Location, "The member `{0}' does not hide an inherited member. The new keyword is not required", GetSignatureForError ()); } } } else { if ((ModFlags & Modifiers.NEW) == 0) { ModFlags |= Modifiers.NEW; if (!IsCompilerGenerated) { Report.SymbolRelatedToPreviousError (base_member); if (!IsInterface && (base_member.Modifiers & (Modifiers.ABSTRACT | Modifiers.VIRTUAL | Modifiers.OVERRIDE)) != 0) { Report.Warning (114, 2, Location, "`{0}' hides inherited member `{1}'. To make the current member override that implementation, add the override keyword. Otherwise add the new keyword", GetSignatureForError (), base_member.GetSignatureForError ()); } else { Report.Warning (108, 2, Location, "`{0}' hides inherited member `{1}'. Use the new keyword if hiding was intended", GetSignatureForError (), base_member.GetSignatureForError ()); } } } if (!IsInterface && base_member.IsAbstract && candidate == null) { Report.SymbolRelatedToPreviousError (base_member); Report.Error (533, Location, "`{0}' hides inherited abstract member `{1}'", GetSignatureForError (), base_member.GetSignatureForError ()); } } return true; } protected virtual bool CheckForDuplications () { return Parent.MemberCache.CheckExistingMembersOverloads (this, ParametersCompiled.EmptyReadOnlyParameters); } // // Performs various checks on the MethodInfo `mb' regarding the modifier flags // that have been defined. // protected virtual bool CheckOverrideAgainstBase (MemberSpec base_member) { bool ok = true; if ((base_member.Modifiers & (Modifiers.ABSTRACT | Modifiers.VIRTUAL | Modifiers.OVERRIDE)) == 0) { Report.SymbolRelatedToPreviousError (base_member); Report.Error (506, Location, "`{0}': cannot override inherited member `{1}' because it is not marked virtual, abstract or override", GetSignatureForError (), TypeManager.CSharpSignature (base_member)); ok = false; } // Now we check that the overriden method is not final if ((base_member.Modifiers & Modifiers.SEALED) != 0) { Report.SymbolRelatedToPreviousError (base_member); Report.Error (239, Location, "`{0}': cannot override inherited member `{1}' because it is sealed", GetSignatureForError (), TypeManager.CSharpSignature (base_member)); ok = false; } var base_member_type = ((IInterfaceMemberSpec) base_member).MemberType; if (!TypeSpecComparer.Override.IsEqual (MemberType, base_member_type)) { Report.SymbolRelatedToPreviousError (base_member); if (this is PropertyBasedMember) { Report.Error (1715, Location, "`{0}': type must be `{1}' to match overridden member `{2}'", GetSignatureForError (), TypeManager.CSharpName (base_member_type), TypeManager.CSharpSignature (base_member)); } else { Report.Error (508, Location, "`{0}': return type must be `{1}' to match overridden member `{2}'", GetSignatureForError (), TypeManager.CSharpName (base_member_type), TypeManager.CSharpSignature (base_member)); } ok = false; } return ok; } protected static bool CheckAccessModifiers (MemberCore this_member, MemberSpec base_member) { var thisp = this_member.ModFlags & Modifiers.AccessibilityMask; var base_classp = base_member.Modifiers & Modifiers.AccessibilityMask; if ((base_classp & (Modifiers.PROTECTED | Modifiers.INTERNAL)) == (Modifiers.PROTECTED | Modifiers.INTERNAL)) { // // It must be at least "protected" // if ((thisp & Modifiers.PROTECTED) == 0) { return false; } // // when overriding protected internal, the method can be declared // protected internal only within the same assembly or assembly // which has InternalsVisibleTo // if ((thisp & Modifiers.INTERNAL) != 0) { return base_member.DeclaringType.MemberDefinition.IsInternalAsPublic (this_member.Module.DeclaringAssembly); } // // protected overriding protected internal inside same assembly // requires internal modifier as well // if (base_member.DeclaringType.MemberDefinition.IsInternalAsPublic (this_member.Module.DeclaringAssembly)) { return false; } return true; } return thisp == base_classp; } public override bool Define () { if (IsInterface) { ModFlags = Modifiers.PUBLIC | Modifiers.ABSTRACT | Modifiers.VIRTUAL | (ModFlags & (Modifiers.UNSAFE | Modifiers.NEW)); flags = MethodAttributes.Public | MethodAttributes.Abstract | MethodAttributes.HideBySig | MethodAttributes.NewSlot | MethodAttributes.Virtual; } else { Parent.PartialContainer.MethodModifiersValid (this); flags = ModifiersExtensions.MethodAttr (ModFlags); } if (IsExplicitImpl) { TypeExpr iface_texpr = MemberName.Left.GetTypeExpression ().ResolveAsTypeTerminal (Parent, false); if (iface_texpr == null) return false; if ((ModFlags & Modifiers.PARTIAL) != 0) { Report.Error (754, Location, "A partial method `{0}' cannot explicitly implement an interface", GetSignatureForError ()); } InterfaceType = iface_texpr.Type; if (!InterfaceType.IsInterface) { Report.SymbolRelatedToPreviousError (InterfaceType); Report.Error (538, Location, "The type `{0}' in explicit interface declaration is not an interface", TypeManager.CSharpName (InterfaceType)); } else { Parent.PartialContainer.VerifyImplements (this); } ModifiersExtensions.Check (Modifiers.AllowedExplicitImplFlags, explicit_mod_flags, 0, Location, Report); } return base.Define (); } protected bool DefineParameters (ParametersCompiled parameters) { if (!parameters.Resolve (this)) return false; bool error = false; for (int i = 0; i < parameters.Count; ++i) { Parameter p = parameters [i]; if (p.HasDefaultValue && (IsExplicitImpl || this is Operator || (this is Indexer && parameters.Count == 1))) p.Warning_UselessOptionalParameter (Report); if (p.CheckAccessibility (this)) continue; TypeSpec t = parameters.Types [i]; Report.SymbolRelatedToPreviousError (t); if (this is Indexer) Report.Error (55, Location, "Inconsistent accessibility: parameter type `{0}' is less accessible than indexer `{1}'", TypeManager.CSharpName (t), GetSignatureForError ()); else if (this is Operator) Report.Error (57, Location, "Inconsistent accessibility: parameter type `{0}' is less accessible than operator `{1}'", TypeManager.CSharpName (t), GetSignatureForError ()); else Report.Error (51, Location, "Inconsistent accessibility: parameter type `{0}' is less accessible than method `{1}'", TypeManager.CSharpName (t), GetSignatureForError ()); error = true; } return !error; } public override void Emit() { // for extern static method must be specified either DllImport attribute or MethodImplAttribute. // We are more strict than csc and report this as an error because SRE does not allow emit that if ((ModFlags & Modifiers.EXTERN) != 0 && !is_external_implementation) { if (this is Constructor) { Report.Warning (824, 1, Location, "Constructor `{0}' is marked `external' but has no external implementation specified", GetSignatureForError ()); } else { Report.Warning (626, 1, Location, "`{0}' is marked as an external but has no DllImport attribute. Consider adding a DllImport attribute to specify the external implementation", GetSignatureForError ()); } } base.Emit (); } public override bool EnableOverloadChecks (MemberCore overload) { // // Two members can differ in their explicit interface // type parameter only // InterfaceMemberBase imb = overload as InterfaceMemberBase; if (imb != null && imb.IsExplicitImpl) { if (IsExplicitImpl) { caching_flags |= Flags.MethodOverloadsExist; } return true; } return IsExplicitImpl; } protected void Error_CannotChangeAccessModifiers (MemberCore member, MemberSpec base_member) { var base_modifiers = base_member.Modifiers; // Remove internal modifier from types which are not internally accessible if ((base_modifiers & Modifiers.AccessibilityMask) == (Modifiers.PROTECTED | Modifiers.INTERNAL) && !base_member.DeclaringType.MemberDefinition.IsInternalAsPublic (member.Module.DeclaringAssembly)) base_modifiers = Modifiers.PROTECTED; Report.SymbolRelatedToPreviousError (base_member); Report.Error (507, member.Location, "`{0}': cannot change access modifiers when overriding `{1}' inherited member `{2}'", member.GetSignatureForError (), ModifiersExtensions.AccessibilityName (base_modifiers), base_member.GetSignatureForError ()); } protected void Error_StaticReturnType () { Report.Error (722, Location, "`{0}': static types cannot be used as return types", MemberType.GetSignatureForError ()); } /// /// Gets base method and its return type /// protected virtual MemberSpec FindBaseMember (out MemberSpec bestCandidate) { return MemberCache.FindBaseMember (this, out bestCandidate); } // // The "short" name of this property / indexer / event. This is the // name without the explicit interface. // public string ShortName { get { return MemberName.Name; } set { SetMemberName (new MemberName (MemberName.Left, value, Location)); } } // // Returns full metadata method name // public string GetFullName (MemberName name) { return GetFullName (name.Name); } public string GetFullName (string name) { if (!IsExplicitImpl) return name; // // When dealing with explicit members a full interface type // name is added to member name to avoid possible name conflicts // // We use CSharpName which gets us full name with benefit of // replacing predefined names which saves some space and name // is still unique // return TypeManager.CSharpName (InterfaceType) + "." + name; } protected override bool VerifyClsCompliance () { if (!base.VerifyClsCompliance ()) { return false; } if (GenericMethod != null) GenericMethod.VerifyClsCompliance (); return true; } public override bool IsUsed { get { return IsExplicitImpl || base.IsUsed; } } } public abstract class MemberBase : MemberCore { protected FullNamedExpression type_expr; protected TypeSpec member_type; public readonly DeclSpace ds; public readonly GenericMethod GenericMethod; protected MemberBase (DeclSpace parent, GenericMethod generic, FullNamedExpression type, Modifiers mod, Modifiers allowed_mod, Modifiers def_mod, MemberName name, Attributes attrs) : base (parent, name, attrs) { this.ds = generic != null ? generic : (DeclSpace) parent; this.type_expr = type; ModFlags = ModifiersExtensions.Check (allowed_mod, mod, def_mod, Location, Report); GenericMethod = generic; if (GenericMethod != null) GenericMethod.ModFlags = ModFlags; } #region Properties public TypeSpec MemberType { get { return member_type; } } public FullNamedExpression TypeExpression { get { return type_expr; } } #endregion // // Main member define entry // public override bool Define () { DoMemberTypeIndependentChecks (); // // Returns false only when type resolution failed // if (!ResolveMemberType ()) return false; DoMemberTypeDependentChecks (); return true; } // // Any type_name independent checks // protected virtual void DoMemberTypeIndependentChecks () { if ((Parent.ModFlags & Modifiers.SEALED) != 0 && (ModFlags & (Modifiers.VIRTUAL | Modifiers.ABSTRACT)) != 0) { Report.Error (549, Location, "New virtual member `{0}' is declared in a sealed class `{1}'", GetSignatureForError (), Parent.GetSignatureForError ()); } } // // Any type_name dependent checks // protected virtual void DoMemberTypeDependentChecks () { // verify accessibility if (!IsAccessibleAs (MemberType)) { Report.SymbolRelatedToPreviousError (MemberType); if (this is Property) Report.Error (53, Location, "Inconsistent accessibility: property type `" + TypeManager.CSharpName (MemberType) + "' is less " + "accessible than property `" + GetSignatureForError () + "'"); else if (this is Indexer) Report.Error (54, Location, "Inconsistent accessibility: indexer return type `" + TypeManager.CSharpName (MemberType) + "' is less " + "accessible than indexer `" + GetSignatureForError () + "'"); else if (this is MethodCore) { if (this is Operator) Report.Error (56, Location, "Inconsistent accessibility: return type `" + TypeManager.CSharpName (MemberType) + "' is less " + "accessible than operator `" + GetSignatureForError () + "'"); else Report.Error (50, Location, "Inconsistent accessibility: return type `" + TypeManager.CSharpName (MemberType) + "' is less " + "accessible than method `" + GetSignatureForError () + "'"); } else { Report.Error (52, Location, "Inconsistent accessibility: field type `" + TypeManager.CSharpName (MemberType) + "' is less " + "accessible than field `" + GetSignatureForError () + "'"); } } Variance variance = this is Event ? Variance.Contravariant : Variance.Covariant; TypeManager.CheckTypeVariance (MemberType, variance, this); } protected bool IsTypePermitted () { if (TypeManager.IsSpecialType (MemberType)) { Report.Error (610, Location, "Field or property cannot be of type `{0}'", TypeManager.CSharpName (MemberType)); return false; } return true; } protected virtual bool CheckBase () { CheckProtectedModifier (); return true; } protected virtual bool ResolveMemberType () { if (member_type != null) throw new InternalErrorException ("Multi-resolve"); TypeExpr te = type_expr.ResolveAsTypeTerminal (this, false); if (te == null) return false; // // Replace original type name, error reporting can use fully resolved name // type_expr = te; member_type = te.Type; return true; } } }