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2010-05-25 Jb Evain <jbevain@novell.com>
[mcs.git] / mcs / class.cs
bloba950801e5da0a3ea3492a169f33e905c8d58bd16
1 //
2 // class.cs: Class and Struct handlers
3 //
4 // Authors: Miguel de Icaza (miguel@gnu.org)
5 // Martin Baulig (martin@ximian.com)
6 // Marek Safar (marek.safar@seznam.cz)
7 //
8 // Dual licensed under the terms of the MIT X11 or GNU GPL
9 //
10 // Copyright 2001, 2002, 2003 Ximian, Inc (http://www.ximian.com)
11 // Copyright 2004-2008 Novell, Inc
12 //
13
14 using System;
15 using System.Collections.Generic;
16 using System.Reflection;
17 using System.Reflection.Emit;
18 using System.Runtime.CompilerServices;
19 using System.Runtime.InteropServices;
20 using System.Security;
21 using System.Security.Permissions;
22 using System.Text;
23 using System.Linq;
24
25 #if NET_2_1
26 using XmlElement = System.Object;
27 #else
28 using System.Xml;
29 #endif
30
31 using Mono.CompilerServices.SymbolWriter;
32
33 namespace Mono.CSharp {
34
35 /// <summary>
36 /// This is the base class for structs and classes.
37 /// </summary>
38 public abstract class TypeContainer : DeclSpace, ITypeDefinition
39 {
40 //
41 // Different context is needed when resolving type container base
42 // types. Type names come from the parent scope but type parameter
43 // names from the container scope.
44 //
45 public struct BaseContext : IMemberContext
46 {
47 TypeContainer tc;
48
49 public BaseContext (TypeContainer tc)
50 {
51 this.tc = tc;
52 }
53
54 #region IMemberContext Members
55
56 public CompilerContext Compiler {
57 get { return tc.Compiler; }
58 }
59
60 public TypeSpec CurrentType {
61 get { return tc.Parent.CurrentType; }
62 }
63
64 public TypeParameter[] CurrentTypeParameters {
65 get { return tc.PartialContainer.CurrentTypeParameters; }
66 }
67
68 public MemberCore CurrentMemberDefinition {
69 get { return tc; }
70 }
71
72 public bool HasUnresolvedConstraints {
73 get { return true; }
74 }
75
76 public bool IsObsolete {
77 get { return tc.IsObsolete; }
78 }
79
80 public bool IsUnsafe {
81 get { return tc.IsUnsafe; }
82 }
83
84 public bool IsStatic {
85 get { return tc.IsStatic; }
86 }
87
88 public string GetSignatureForError ()
89 {
90 return tc.GetSignatureForError ();
91 }
92
93 public ExtensionMethodGroupExpr LookupExtensionMethod (TypeSpec extensionType, string name, int arity, Location loc)
94 {
95 return null;
96 }
97
98 public FullNamedExpression LookupNamespaceAlias (string name)
99 {
100 return tc.Parent.LookupNamespaceAlias (name);
101 }
102
103 public FullNamedExpression LookupNamespaceOrType (string name, int arity, Location loc, bool ignore_cs0104)
104 {
105 if (arity == 0) {
106 TypeParameter[] tp = CurrentTypeParameters;
107 if (tp != null) {
108 TypeParameter t = TypeParameter.FindTypeParameter (tp, name);
109 if (t != null)
110 return new TypeParameterExpr (t, loc);
111 }
112 }
113
114 return tc.Parent.LookupNamespaceOrType (name, arity, loc, ignore_cs0104);
115 }
116
117 #endregion
118 }
119
120 [Flags]
121 enum CachedMethods
122 {
123 Equals = 1,
124 GetHashCode = 1 << 1,
125 HasStaticFieldInitializer = 1 << 2
126 }
127
128
129 // Whether this is a struct, class or interface
130 public readonly MemberKind Kind;
131
132 // Holds a list of classes and structures
133 protected List<TypeContainer> types;
134
135 List<MemberCore> ordered_explicit_member_list;
136 List<MemberCore> ordered_member_list;
137
138 // Holds the list of properties
139 List<MemberCore> properties;
140
141 // Holds the list of constructors
142 protected List<Constructor> instance_constructors;
143
144 // Holds the list of fields
145 protected List<FieldBase> fields;
146
147 // Holds a list of fields that have initializers
148 protected List<FieldInitializer> initialized_fields;
149
150 // Holds a list of static fields that have initializers
151 protected List<FieldInitializer> initialized_static_fields;
152
153 // Holds the list of constants
154 protected List<MemberCore> constants;
155
156 // Holds the methods.
157 List<MemberCore> methods;
158
159 // Holds the events
160 protected List<MemberCore> events;
161
162 // Holds the indexers
163 List<MemberCore> indexers;
164
165 // Holds the operators
166 List<MemberCore> operators;
167
168 // Holds the compiler generated classes
169 List<CompilerGeneratedClass> compiler_generated;
170
171 //
172 // Pointers to the default constructor and the default static constructor
173 //
174 protected Constructor default_constructor;
175 protected Constructor default_static_constructor;
176
177 //
178 // Points to the first non-static field added to the container.
179 //
180 // This is an arbitrary choice. We are interested in looking at _some_ non-static field,
181 // and the first one's as good as any.
182 //
183 FieldBase first_nonstatic_field = null;
184
185 //
186 // This one is computed after we can distinguish interfaces
187 // from classes from the arraylist `type_bases'
188 //
189 TypeExpr base_type;
190 protected TypeExpr[] iface_exprs;
191
192 protected List<FullNamedExpression> type_bases;
193
194 bool members_defined;
195 bool members_defined_ok;
196 bool type_defined;
197
198 TypeContainer InTransit;
199
200 GenericTypeParameterBuilder[] all_tp_builders;
201
202 public const string DefaultIndexerName = "Item";
203
204 private bool seen_normal_indexers = false;
205 private string indexer_name = DefaultIndexerName;
206 protected bool requires_delayed_unmanagedtype_check;
207 bool error;
208
209 private CachedMethods cached_method;
210
211 protected TypeSpec spec;
212 TypeSpec current_type;
213
214 List<TypeContainer> partial_parts;
215
216 /// <remarks>
217 /// The pending methods that need to be implemented
218 // (interfaces or abstract methods)
219 /// </remarks>
220 PendingImplementation pending;
221
222 public TypeContainer (NamespaceEntry ns, DeclSpace parent, MemberName name,
223 Attributes attrs, MemberKind kind)
224 : base (ns, parent, name, attrs)
225 {
226 if (parent != null && parent.NamespaceEntry != ns)
227 throw new InternalErrorException ("A nested type should be in the same NamespaceEntry as its enclosing class");
228
229 this.Kind = kind;
230 this.PartialContainer = this;
231 }
232
233 #region Properties
234
235 public override TypeSpec CurrentType {
236 get {
237 if (current_type == null) {
238 if (IsGeneric) {
239 //
240 // Switch to inflated version as it's used by all expressions
241 //
242 var targs = CurrentTypeParameters == null ? TypeSpec.EmptyTypes : CurrentTypeParameters.Select (l => l.Type).ToArray ();
243 current_type = spec.MakeGenericType (targs);
244 } else {
245 current_type = spec;
246 }
247 }
248
249 return current_type;
250 }
251 }
252
253 public override TypeParameter[] CurrentTypeParameters {
254 get {
255 return PartialContainer.type_params;
256 }
257 }
258
259 int CurrentTypeParametersStartIndex {
260 get {
261 int total = all_tp_builders.Length;
262 if (CurrentTypeParameters != null) {
263 return total - CurrentTypeParameters.Length;
264 }
265 return total;
266 }
267 }
268
269 public TypeSpec Definition {
270 get {
271 return spec;
272 }
273 }
274
275 public bool HasMembersDefined {
276 get {
277 return members_defined;
278 }
279 }
280
281 #endregion
282
283 public bool AddMember (MemberCore symbol)
284 {
285 return AddToContainer (symbol, symbol.MemberName.Basename);
286 }
287
288 protected virtual bool AddMemberType (TypeContainer ds)
289 {
290 return AddToContainer (ds, ds.Basename);
291 }
292
293 protected virtual void RemoveMemberType (DeclSpace ds)
294 {
295 RemoveFromContainer (ds.Basename);
296 }
297
298 public void AddConstant (Const constant)
299 {
300 if (!AddMember (constant))
301 return;
302
303 if (constants == null)
304 constants = new List<MemberCore> ();
305
306 constants.Add (constant);
307 }
308
309 public TypeContainer AddTypeContainer (TypeContainer tc)
310 {
311 if (!AddMemberType (tc))
312 return tc;
313
314 if (types == null)
315 types = new List<TypeContainer> ();
316
317 types.Add (tc);
318 return tc;
319 }
320
321 public virtual TypeContainer AddPartial (TypeContainer next_part)
322 {
323 return AddPartial (next_part, next_part.Basename);
324 }
325
326 protected TypeContainer AddPartial (TypeContainer next_part, string name)
327 {
328 next_part.ModFlags |= Modifiers.PARTIAL;
329 TypeContainer tc = GetDefinition (name) as TypeContainer;
330 if (tc == null)
331 return AddTypeContainer (next_part);
332
333 if ((tc.ModFlags & Modifiers.PARTIAL) == 0) {
334 Report.SymbolRelatedToPreviousError (next_part);
335 Error_MissingPartialModifier (tc);
336 }
337
338 if (tc.Kind != next_part.Kind) {
339 Report.SymbolRelatedToPreviousError (tc);
340 Report.Error (261, next_part.Location,
341 "Partial declarations of `{0}' must be all classes, all structs or all interfaces",
342 next_part.GetSignatureForError ());
343 }
344
345 if ((tc.ModFlags & Modifiers.AccessibilityMask) != (next_part.ModFlags & Modifiers.AccessibilityMask) &&
346 ((tc.ModFlags & Modifiers.DEFAULT_ACCESS_MODIFER) == 0 &&
347 (next_part.ModFlags & Modifiers.DEFAULT_ACCESS_MODIFER) == 0)) {
348 Report.SymbolRelatedToPreviousError (tc);
349 Report.Error (262, next_part.Location,
350 "Partial declarations of `{0}' have conflicting accessibility modifiers",
351 next_part.GetSignatureForError ());
352 }
353
354 if (tc.partial_parts == null)
355 tc.partial_parts = new List<TypeContainer> (1);
356
357 if ((next_part.ModFlags & Modifiers.DEFAULT_ACCESS_MODIFER) != 0) {
358 tc.ModFlags |= next_part.ModFlags & ~(Modifiers.DEFAULT_ACCESS_MODIFER | Modifiers.AccessibilityMask);
359 } else if ((tc.ModFlags & Modifiers.DEFAULT_ACCESS_MODIFER) != 0) {
360 tc.ModFlags &= ~(Modifiers.DEFAULT_ACCESS_MODIFER | Modifiers.AccessibilityMask);
361 tc.ModFlags |= next_part.ModFlags;
362 } else {
363 tc.ModFlags |= next_part.ModFlags;
364 }
365
366 tc.spec.Modifiers = tc.ModFlags;
367
368 if (next_part.attributes != null) {
369 if (tc.attributes == null)
370 tc.attributes = next_part.attributes;
371 else
372 tc.attributes.AddAttributes (next_part.attributes.Attrs);
373 }
374
375 next_part.PartialContainer = tc;
376 tc.partial_parts.Add (next_part);
377 return tc;
378 }
379
380 public virtual void RemoveTypeContainer (TypeContainer next_part)
381 {
382 if (types != null)
383 types.Remove (next_part);
384 RemoveMemberType (next_part);
385 }
386
387 public void AddDelegate (Delegate d)
388 {
389 AddTypeContainer (d);
390 }
391
392 private void AddMemberToList (MemberCore mc, List<MemberCore> alist, bool isexplicit)
393 {
394 if (ordered_explicit_member_list == null) {
395 ordered_explicit_member_list = new List<MemberCore> ();
396 ordered_member_list = new List<MemberCore> ();
397 }
398
399 if (isexplicit) {
400 if (Kind == MemberKind.Interface) {
401 Report.Error (541, mc.Location,
402 "`{0}': explicit interface declaration can only be declared in a class or struct",
403 mc.GetSignatureForError ());
404 }
405
406 ordered_explicit_member_list.Add (mc);
407 alist.Insert (0, mc);
408 } else {
409 ordered_member_list.Add (mc);
410 alist.Add (mc);
411 }
412
413 }
414
415 public void AddMethod (MethodOrOperator method)
416 {
417 if (!AddToContainer (method, method.MemberName.Basename))
418 return;
419
420 if (methods == null)
421 methods = new List<MemberCore> ();
422
423 if (method.MemberName.Left != null)
424 AddMemberToList (method, methods, true);
425 else
426 AddMemberToList (method, methods, false);
427 }
428
429 public void AddConstructor (Constructor c)
430 {
431 bool is_static = (c.ModFlags & Modifiers.STATIC) != 0;
432 if (!AddToContainer (c, is_static ?
433 ConstructorBuilder.ConstructorName : ConstructorBuilder.TypeConstructorName))
434 return;
435
436 if (is_static && c.ParameterInfo.IsEmpty){
437 if (default_static_constructor != null) {
438 Report.SymbolRelatedToPreviousError (default_static_constructor);
439 Report.Error (111, c.Location,
440 "A member `{0}' is already defined. Rename this member or use different parameter types",
441 c.GetSignatureForError ());
442 return;
443 }
444
445 default_static_constructor = c;
446 } else {
447 if (c.ParameterInfo.IsEmpty)
448 default_constructor = c;
449
450 if (instance_constructors == null)
451 instance_constructors = new List<Constructor> ();
452
453 instance_constructors.Add (c);
454 }
455 }
456
457 public bool AddField (FieldBase field)
458 {
459 if (!AddMember (field))
460 return false;
461
462 if (fields == null)
463 fields = new List<FieldBase> ();
464
465 fields.Add (field);
466
467 if ((field.ModFlags & Modifiers.STATIC) != 0)
468 return true;
469
470 if (first_nonstatic_field == null) {
471 first_nonstatic_field = field;
472 return true;
473 }
474
475 if (Kind == MemberKind.Struct && first_nonstatic_field.Parent != field.Parent) {
476 Report.SymbolRelatedToPreviousError (first_nonstatic_field.Parent);
477 Report.Warning (282, 3, field.Location,
478 "struct instance field `{0}' found in different declaration from instance field `{1}'",
479 field.GetSignatureForError (), first_nonstatic_field.GetSignatureForError ());
480 }
481 return true;
482 }
483
484 public void AddProperty (Property prop)
485 {
486 if (!AddMember (prop) ||
487 !AddMember (prop.Get) || !AddMember (prop.Set))
488 return;
489
490 if (properties == null)
491 properties = new List<MemberCore> ();
492
493 if (prop.MemberName.Left != null)
494 AddMemberToList (prop, properties, true);
495 else
496 AddMemberToList (prop, properties, false);
497 }
498
499 public void AddEvent (Event e)
500 {
501 if (!AddMember (e))
502 return;
503
504 if (e is EventProperty) {
505 if (!AddMember (e.Add))
506 return;
507
508 if (!AddMember (e.Remove))
509 return;
510 }
511
512 if (events == null)
513 events = new List<MemberCore> ();
514
515 events.Add (e);
516 }
517
518 /// <summary>
519 /// Indexer has special handling in constrast to other AddXXX because the name can be driven by IndexerNameAttribute
520 /// </summary>
521 public void AddIndexer (Indexer i)
522 {
523 if (indexers == null)
524 indexers = new List<MemberCore> ();
525
526 if (i.IsExplicitImpl)
527 AddMemberToList (i, indexers, true);
528 else
529 AddMemberToList (i, indexers, false);
530 }
531
532 public void AddOperator (Operator op)
533 {
534 if (!AddMember (op))
535 return;
536
537 if (operators == null)
538 operators = new List<MemberCore> ();
539
540 operators.Add (op);
541 }
542
543 public void AddCompilerGeneratedClass (CompilerGeneratedClass c)
544 {
545 Report.Debug (64, "ADD COMPILER GENERATED CLASS", this, c);
546
547 if (compiler_generated == null)
548 compiler_generated = new List<CompilerGeneratedClass> ();
549
550 compiler_generated.Add (c);
551 }
552
553 public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
554 {
555 if (a.Type == pa.DefaultMember) {
556 if (Indexers != null) {
557 Report.Error (646, a.Location, "Cannot specify the `DefaultMember' attribute on type containing an indexer");
558 return;
559 }
560 }
561
562 if (a.Type == pa.Required) {
563 Report.Error (1608, a.Location, "The RequiredAttribute attribute is not permitted on C# types");
564 return;
565 }
566
567 TypeBuilder.SetCustomAttribute ((ConstructorInfo) ctor.GetMetaInfo (), cdata);
568 }
569
570 public override AttributeTargets AttributeTargets {
571 get {
572 throw new NotSupportedException ();
573 }
574 }
575
576 public IList<TypeContainer> Types {
577 get {
578 return types;
579 }
580 }
581
582 public IList<MemberCore> Methods {
583 get {
584 return methods;
585 }
586 }
587
588 public IList<MemberCore> Constants {
589 get {
590 return constants;
591 }
592 }
593
594 public virtual TypeSpec BaseType {
595 get {
596 return spec.BaseType;
597 }
598 }
599
600 public IList<FieldBase> Fields {
601 get {
602 return fields;
603 }
604 }
605
606 public IList<Constructor> InstanceConstructors {
607 get {
608 return instance_constructors;
609 }
610 }
611
612 public IList<MemberCore> Properties {
613 get {
614 return properties;
615 }
616 }
617
618 public IList<MemberCore> Events {
619 get {
620 return events;
621 }
622 }
623
624 public IList<MemberCore> Indexers {
625 get {
626 return indexers;
627 }
628 }
629
630 public IList<MemberCore> Operators {
631 get {
632 return operators;
633 }
634 }
635
636 public IList<CompilerGeneratedClass> CompilerGeneratedClasses {
637 get {
638 return compiler_generated;
639 }
640 }
641
642 protected override TypeAttributes TypeAttr {
643 get {
644 return ModifiersExtensions.TypeAttr (ModFlags, IsTopLevel) | base.TypeAttr;
645 }
646 }
647
648 public int TypeParametersCount {
649 get {
650 return MemberName.Arity;
651 }
652 }
653
654 TypeParameterSpec[] ITypeDefinition.TypeParameters {
655 get {
656 // TODO MemberCache: this is going to hurt
657 return PartialContainer.type_params.Select (l => l.Type).ToArray ();
658 }
659 }
660
661 public string GetAttributeDefaultMember ()
662 {
663 return indexers == null ? DefaultIndexerName : indexer_name;
664 }
665
666 public bool IsComImport {
667 get {
668 if (OptAttributes == null)
669 return false;
670
671 return OptAttributes.Contains (PredefinedAttributes.Get.ComImport);
672 }
673 }
674
675 string ITypeDefinition.Namespace {
676 get {
677 return NamespaceEntry.NS.MemberName.GetSignatureForError ();
678 }
679 }
680
681 public virtual void RegisterFieldForInitialization (MemberCore field, FieldInitializer expression)
682 {
683 if ((field.ModFlags & Modifiers.STATIC) != 0){
684 if (initialized_static_fields == null) {
685 PartialContainer.HasStaticFieldInitializer = true;
686 initialized_static_fields = new List<FieldInitializer> (4);
687 }
688
689 initialized_static_fields.Add (expression);
690 } else {
691 if (initialized_fields == null)
692 initialized_fields = new List<FieldInitializer> (4);
693
694 initialized_fields.Add (expression);
695 }
696 }
697
698 public void ResolveFieldInitializers (BlockContext ec)
699 {
700 if (partial_parts != null) {
701 foreach (TypeContainer part in partial_parts) {
702 part.DoResolveFieldInitializers (ec);
703 }
704 }
705 DoResolveFieldInitializers (ec);
706 }
707
708 void DoResolveFieldInitializers (BlockContext ec)
709 {
710 if (ec.IsStatic) {
711 if (initialized_static_fields == null)
712 return;
713
714 bool has_complex_initializer = !RootContext.Optimize;
715 int i;
716 ExpressionStatement [] init = new ExpressionStatement [initialized_static_fields.Count];
717 for (i = 0; i < initialized_static_fields.Count; ++i) {
718 FieldInitializer fi = initialized_static_fields [i];
719 ExpressionStatement s = fi.ResolveStatement (ec);
720 if (s == null) {
721 s = EmptyExpressionStatement.Instance;
722 } else if (fi.IsComplexInitializer) {
723 has_complex_initializer |= true;
724 }
725
726 init [i] = s;
727 }
728
729 for (i = 0; i < initialized_static_fields.Count; ++i) {
730 FieldInitializer fi = initialized_static_fields [i];
731 //
732 // Need special check to not optimize code like this
733 // static int a = b = 5;
734 // static int b = 0;
735 //
736 if (!has_complex_initializer && fi.IsDefaultInitializer)
737 continue;
738
739 ec.CurrentBlock.AddScopeStatement (new StatementExpression (init [i]));
740 }
741
742 return;
743 }
744
745 if (initialized_fields == null)
746 return;
747
748 for (int i = 0; i < initialized_fields.Count; ++i) {
749 FieldInitializer fi = (FieldInitializer) initialized_fields [i];
750 ExpressionStatement s = fi.ResolveStatement (ec);
751 if (s == null)
752 continue;
753
754 //
755 // Field is re-initialized to its default value => removed
756 //
757 if (fi.IsDefaultInitializer && RootContext.Optimize)
758 continue;
759
760 ec.CurrentBlock.AddScopeStatement (new StatementExpression (s));
761 }
762 }
763
764 public override string DocComment {
765 get {
766 return comment;
767 }
768 set {
769 if (value == null)
770 return;
771
772 comment += value;
773 }
774 }
775
776 public PendingImplementation PendingImplementations {
777 get { return pending; }
778 }
779
780 public TypeSpec GetAttributeCoClass ()
781 {
782 if (OptAttributes == null)
783 return null;
784
785 Attribute a = OptAttributes.Search (PredefinedAttributes.Get.CoClass);
786 if (a == null)
787 return null;
788
789 return a.GetCoClassAttributeValue ();
790 }
791
792 public AttributeUsageAttribute GetAttributeUsage (PredefinedAttribute pa)
793 {
794 Attribute a = null;
795 if (OptAttributes != null) {
796 a = OptAttributes.Search (pa);
797 }
798
799 if (a == null)
800 return null;
801
802 return a.GetAttributeUsageAttribute ();
803 }
804
805 public virtual void AddBasesForPart (DeclSpace part, List<FullNamedExpression> bases)
806 {
807 // FIXME: get rid of partial_parts and store lists of bases of each part here
808 // assumed, not verified: 'part' is in 'partial_parts'
809 ((TypeContainer) part).type_bases = bases;
810 }
811
812 /// <summary>
813 /// This function computes the Base class and also the
814 /// list of interfaces that the class or struct @c implements.
815 ///
816 /// The return value is an array (might be null) of
817 /// interfaces implemented (as Types).
818 ///
819 /// The @base_class argument is set to the base object or null
820 /// if this is `System.Object'.
821 /// </summary>
822 protected virtual TypeExpr[] ResolveBaseTypes (out TypeExpr base_class)
823 {
824 base_class = null;
825 if (type_bases == null)
826 return null;
827
828 int count = type_bases.Count;
829 TypeExpr [] ifaces = null;
830 var base_context = new BaseContext (this);
831 for (int i = 0, j = 0; i < count; i++){
832 FullNamedExpression fne = type_bases [i];
833
834 TypeExpr fne_resolved = fne.ResolveAsTypeTerminal (base_context, false);
835 if (fne_resolved == null)
836 continue;
837
838 if (i == 0 && Kind == MemberKind.Class && !fne_resolved.Type.IsInterface) {
839 if (fne_resolved.Type == InternalType.Dynamic)
840 Report.Error (1965, Location, "Class `{0}' cannot derive from the dynamic type",
841 GetSignatureForError ());
842 else
843 base_class = fne_resolved;
844 continue;
845 }
846
847 if (ifaces == null)
848 ifaces = new TypeExpr [count - i];
849
850 if (fne_resolved.Type.IsInterface) {
851 for (int ii = 0; ii < j; ++ii) {
852 if (TypeManager.IsEqual (fne_resolved.Type, ifaces [ii].Type)) {
853 Report.Error (528, Location, "`{0}' is already listed in interface list",
854 fne_resolved.GetSignatureForError ());
855 break;
856 }
857 }
858
859 if (Kind == MemberKind.Interface && !IsAccessibleAs (fne_resolved.Type)) {
860 Report.Error (61, fne.Location,
861 "Inconsistent accessibility: base interface `{0}' is less accessible than interface `{1}'",
862 fne_resolved.GetSignatureForError (), GetSignatureForError ());
863 }
864 } else {
865 Report.SymbolRelatedToPreviousError (fne_resolved.Type);
866 if (Kind != MemberKind.Class) {
867 Report.Error (527, fne.Location, "Type `{0}' in interface list is not an interface", fne_resolved.GetSignatureForError ());
868 } else if (base_class != null)
869 Report.Error (1721, fne.Location, "`{0}': Classes cannot have multiple base classes (`{1}' and `{2}')",
870 GetSignatureForError (), base_class.GetSignatureForError (), fne_resolved.GetSignatureForError ());
871 else {
872 Report.Error (1722, fne.Location, "`{0}': Base class `{1}' must be specified as first",
873 GetSignatureForError (), fne_resolved.GetSignatureForError ());
874 }
875 }
876
877 ifaces [j++] = fne_resolved;
878 }
879
880 return ifaces;
881 }
882
883 TypeExpr[] GetNormalPartialBases (ref TypeExpr base_class)
884 {
885 var ifaces = new List<TypeExpr> (0);
886 if (iface_exprs != null)
887 ifaces.AddRange (iface_exprs);
888
889 foreach (TypeContainer part in partial_parts) {
890 TypeExpr new_base_class;
891 TypeExpr[] new_ifaces = part.ResolveBaseTypes (out new_base_class);
892 if (new_base_class != TypeManager.system_object_expr) {
893 if (base_class == TypeManager.system_object_expr)
894 base_class = new_base_class;
895 else {
896 if (new_base_class != null && !TypeManager.IsEqual (new_base_class.Type, base_class.Type)) {
897 Report.SymbolRelatedToPreviousError (base_class.Location, "");
898 Report.Error (263, part.Location,
899 "Partial declarations of `{0}' must not specify different base classes",
900 part.GetSignatureForError ());
901
902 return null;
903 }
904 }
905 }
906
907 if (new_ifaces == null)
908 continue;
909
910 foreach (TypeExpr iface in new_ifaces) {
911 if (ifaces.Contains (iface))
912 continue;
913
914 ifaces.Add (iface);
915 }
916 }
917
918 if (ifaces.Count == 0)
919 return null;
920
921 return ifaces.ToArray ();
922 }
923
924 //
925 // Checks that some operators come in pairs:
926 // == and !=
927 // > and <
928 // >= and <=
929 // true and false
930 //
931 // They are matched based on the return type and the argument types
932 //
933 void CheckPairedOperators ()
934 {
935 bool has_equality_or_inequality = false;
936 var operators = this.operators.ToArray ();
937 bool[] has_pair = new bool[operators.Length];
938
939 for (int i = 0; i < operators.Length; ++i) {
940 if (operators[i] == null)
941 continue;
942
943 Operator o_a = (Operator) operators[i];
944 Operator.OpType o_type = o_a.OperatorType;
945 if (o_type == Operator.OpType.Equality || o_type == Operator.OpType.Inequality)
946 has_equality_or_inequality = true;
947
948 Operator.OpType matching_type = o_a.GetMatchingOperator ();
949 if (matching_type == Operator.OpType.TOP) {
950 operators[i] = null;
951 continue;
952 }
953
954 for (int ii = 0; ii < operators.Length; ++ii) {
955 Operator o_b = (Operator) operators[ii];
956 if (o_b == null || o_b.OperatorType != matching_type)
957 continue;
958
959 if (!TypeManager.IsEqual (o_a.ReturnType, o_b.ReturnType))
960 continue;
961
962 if (!TypeSpecComparer.Default.Equals (o_a.ParameterTypes, o_b.ParameterTypes))
963 continue;
964
965 operators[i] = null;
966
967 //
968 // Used to ignore duplicate user conversions
969 //
970 has_pair[ii] = true;
971 }
972 }
973
974 for (int i = 0; i < operators.Length; ++i) {
975 if (operators[i] == null || has_pair[i])
976 continue;
977
978 Operator o = (Operator) operators [i];
979 Report.Error (216, o.Location,
980 "The operator `{0}' requires a matching operator `{1}' to also be defined",
981 o.GetSignatureForError (), Operator.GetName (o.GetMatchingOperator ()));
982 }
983
984 if (has_equality_or_inequality) {
985 if (Methods == null || !HasEquals)
986 Report.Warning (660, 2, Location, "`{0}' defines operator == or operator != but does not override Object.Equals(object o)",
987 GetSignatureForError ());
988
989 if (Methods == null || !HasGetHashCode)
990 Report.Warning (661, 2, Location, "`{0}' defines operator == or operator != but does not override Object.GetHashCode()",
991 GetSignatureForError ());
992 }
993 }
994
995 bool CreateTypeBuilder ()
996 {
997 //
998 // Sets .size to 1 for structs with no instance fields
999 //
1000 int type_size = Kind == MemberKind.Struct && first_nonstatic_field == null ? 1 : 0;
1001
1002 if (IsTopLevel) {
1003 if (GlobalRootNamespace.Instance.IsNamespace (Name)) {
1004 Report.Error (519, Location, "`{0}' clashes with a predefined namespace", Name);
1005 return false;
1006 }
1007
1008 ModuleBuilder builder = Module.Compiled.Builder;
1009 TypeBuilder = builder.DefineType (Name, TypeAttr, null, type_size);
1010 } else {
1011 TypeBuilder builder = Parent.TypeBuilder;
1012
1013 TypeBuilder = builder.DefineNestedType (Basename, TypeAttr, null, type_size);
1014 }
1015
1016 spec.SetMetaInfo (TypeBuilder);
1017 spec.MemberCache = new MemberCache (this);
1018 spec.DeclaringType = Parent.CurrentType;
1019
1020 if (!IsTopLevel)
1021 Parent.MemberCache.AddMember (spec);
1022
1023 if (IsGeneric) {
1024 string[] param_names = new string[TypeParameters.Length];
1025 for (int i = 0; i < TypeParameters.Length; i++)
1026 param_names [i] = TypeParameters[i].Name;
1027
1028 all_tp_builders = TypeBuilder.DefineGenericParameters (param_names);
1029
1030 int offset = CurrentTypeParametersStartIndex;
1031 for (int i = offset; i < all_tp_builders.Length; i++) {
1032 CurrentTypeParameters [i - offset].Define (all_tp_builders [i], spec);
1033 }
1034 }
1035
1036 return true;
1037 }
1038
1039 bool DefineBaseTypes ()
1040 {
1041 iface_exprs = ResolveBaseTypes (out base_type);
1042 if (partial_parts != null) {
1043 iface_exprs = GetNormalPartialBases (ref base_type);
1044 }
1045
1046 var cycle = CheckRecursiveDefinition (this);
1047 if (cycle != null) {
1048 Report.SymbolRelatedToPreviousError (cycle);
1049 if (this is Interface) {
1050 Report.Error (529, Location,
1051 "Inherited interface `{0}' causes a cycle in the interface hierarchy of `{1}'",
1052 GetSignatureForError (), cycle.GetSignatureForError ());
1053 } else {
1054 Report.Error (146, Location,
1055 "Circular base class dependency involving `{0}' and `{1}'",
1056 GetSignatureForError (), cycle.GetSignatureForError ());
1057 }
1058
1059 base_type = null;
1060 }
1061
1062 if (iface_exprs != null) {
1063 foreach (TypeExpr iface in iface_exprs) {
1064 // Prevents a crash, the interface might not have been resolved: 442144
1065 if (iface == null)
1066 continue;
1067
1068 var iface_type = iface.Type;
1069
1070 if (!spec.AddInterface (iface_type))
1071 continue;
1072
1073 if (iface_type.IsGeneric && spec.Interfaces != null) {
1074 foreach (var prev_iface in iface_exprs) {
1075 if (prev_iface == iface)
1076 break;
1077
1078 if (!TypeSpecComparer.Unify.IsEqual (iface_type, prev_iface.Type))
1079 continue;
1080
1081 Report.Error (695, Location,
1082 "`{0}' cannot implement both `{1}' and `{2}' because they may unify for some type parameter substitutions",
1083 GetSignatureForError (), prev_iface.GetSignatureForError (), iface_type.GetSignatureForError ());
1084 }
1085 }
1086
1087 TypeBuilder.AddInterfaceImplementation (iface_type.GetMetaInfo ());
1088
1089 // Ensure the base is always setup
1090 var compiled_iface = iface_type.MemberDefinition as Interface;
1091 if (compiled_iface != null) {
1092 // TODO: Need DefineBaseType only
1093 compiled_iface.DefineType ();
1094 }
1095
1096 if (iface_type.Interfaces != null) {
1097 var base_ifaces = new List<TypeSpec> (iface_type.Interfaces);
1098 for (int i = 0; i < base_ifaces.Count; ++i) {
1099 var ii_iface_type = base_ifaces[i];
1100 if (spec.AddInterface (ii_iface_type)) {
1101 TypeBuilder.AddInterfaceImplementation (ii_iface_type.GetMetaInfo ());
1102
1103 if (ii_iface_type.Interfaces != null)
1104 base_ifaces.AddRange (ii_iface_type.Interfaces);
1105 }
1106 }
1107 }
1108 }
1109 }
1110
1111 if (Kind == MemberKind.Interface) {
1112 spec.BaseType = TypeManager.object_type;
1113 return true;
1114 }
1115
1116 TypeSpec base_ts;
1117 if (base_type != null)
1118 base_ts = base_type.Type;
1119 else if (spec.IsStruct)
1120 base_ts = TypeManager.value_type;
1121 else if (spec.IsEnum)
1122 base_ts = TypeManager.enum_type;
1123 else if (spec.IsDelegate)
1124 base_ts = TypeManager.multicast_delegate_type;
1125 else
1126 base_ts = null;
1127
1128 if (base_ts != null) {
1129 spec.BaseType = base_ts;
1130
1131 // Set base type after type creation
1132 TypeBuilder.SetParent (base_ts.GetMetaInfo ());
1133 }
1134
1135 return true;
1136 }
1137
1138 public virtual void DefineConstants ()
1139 {
1140 if (constants != null) {
1141 foreach (Const c in constants) {
1142 c.DefineValue ();
1143 }
1144 }
1145
1146 if (instance_constructors != null) {
1147 foreach (MethodCore m in instance_constructors) {
1148 var p = m.ParameterInfo;
1149 if (!p.IsEmpty && p[p.Count - 1].HasDefaultValue) {
1150 var rc = new ResolveContext (m);
1151 p.ResolveDefaultValues (rc);
1152 }
1153 }
1154 }
1155
1156 if (methods != null) {
1157 foreach (MethodCore m in methods) {
1158 var p = m.ParameterInfo;
1159 if (!p.IsEmpty && p[p.Count - 1].HasDefaultValue) {
1160 var rc = new ResolveContext (m);
1161 p.ResolveDefaultValues (rc);
1162 }
1163 }
1164 }
1165
1166 if (indexers != null) {
1167 foreach (Indexer i in indexers) {
1168 var p = i.ParameterInfo;
1169 if (p[p.Count - 1].HasDefaultValue) {
1170 var rc = new ResolveContext (i);
1171 p.ResolveDefaultValues (rc);
1172 }
1173 }
1174 }
1175
1176 if (types != null) {
1177 foreach (var t in types)
1178 t.DefineConstants ();
1179 }
1180 }
1181
1182 //
1183 // Defines the type in the appropriate ModuleBuilder or TypeBuilder.
1184 //
1185 public TypeBuilder CreateType ()
1186 {
1187 if (TypeBuilder != null)
1188 return TypeBuilder;
1189
1190 if (error)
1191 return null;
1192
1193 if (!CreateTypeBuilder ()) {
1194 error = true;
1195 return null;
1196 }
1197
1198 if (partial_parts != null) {
1199 foreach (TypeContainer part in partial_parts) {
1200 part.spec = spec;
1201 part.current_type = current_type;
1202 part.TypeBuilder = TypeBuilder;
1203 }
1204 }
1205
1206 if (Types != null) {
1207 foreach (TypeContainer tc in Types) {
1208 if (tc.CreateType () == null) {
1209 error = true;
1210 return null;
1211 }
1212 }
1213 }
1214
1215 return TypeBuilder;
1216 }
1217
1218 public override TypeBuilder DefineType ()
1219 {
1220 if (error)
1221 return null;
1222 if (type_defined)
1223 return TypeBuilder;
1224
1225 type_defined = true;
1226
1227 if (!DefineBaseTypes ()) {
1228 error = true;
1229 return null;
1230 }
1231
1232 if (!DefineNestedTypes ()) {
1233 error = true;
1234 return null;
1235 }
1236
1237 return TypeBuilder;
1238 }
1239
1240 public override void SetParameterInfo (List<Constraints> constraints_list)
1241 {
1242 base.SetParameterInfo (constraints_list);
1243
1244 if (PartialContainer.CurrentTypeParameters == null || PartialContainer == this)
1245 return;
1246
1247 TypeParameter[] tc_names = PartialContainer.CurrentTypeParameters;
1248 for (int i = 0; i < tc_names.Length; ++i) {
1249 if (tc_names [i].Name != type_params [i].Name) {
1250 Report.SymbolRelatedToPreviousError (PartialContainer.Location, "");
1251 Report.Error (264, Location, "Partial declarations of `{0}' must have the same type parameter names in the same order",
1252 GetSignatureForError ());
1253 break;
1254 }
1255
1256 if (tc_names [i].Variance != type_params [i].Variance) {
1257 Report.SymbolRelatedToPreviousError (PartialContainer.Location, "");
1258 Report.Error (1067, Location, "Partial declarations of `{0}' must have the same type parameter variance modifiers",
1259 GetSignatureForError ());
1260 break;
1261 }
1262 }
1263 }
1264
1265 //
1266 // Replaces normal spec with predefined one when compiling corlib
1267 // and this type container defines predefined type
1268 //
1269 public void SetPredefinedSpec (PredefinedTypeSpec spec)
1270 {
1271 this.spec = spec;
1272 }
1273
1274 void UpdateTypeParameterConstraints (TypeContainer part)
1275 {
1276 TypeParameter[] current_params = type_params;
1277 for (int i = 0; i < current_params.Length; i++) {
1278 if (current_params [i].AddPartialConstraints (part, part.type_params [i]))
1279 continue;
1280
1281 Report.SymbolRelatedToPreviousError (Location, "");
1282 Report.Error (265, part.Location,
1283 "Partial declarations of `{0}' have inconsistent constraints for type parameter `{1}'",
1284 GetSignatureForError (), current_params [i].GetSignatureForError ());
1285 }
1286 }
1287
1288 public bool ResolveTypeParameters ()
1289 {
1290 if (!DoResolveTypeParameters ())
1291 return false;
1292
1293 if (types != null) {
1294 foreach (var type in types)
1295 if (!type.ResolveTypeParameters ())
1296 return false;
1297 }
1298
1299 if (compiler_generated != null) {
1300 foreach (CompilerGeneratedClass c in compiler_generated)
1301 if (!c.ResolveTypeParameters ())
1302 return false;
1303 }
1304
1305 return true;
1306 }
1307
1308 protected virtual bool DoResolveTypeParameters ()
1309 {
1310 if (CurrentTypeParameters == null)
1311 return true;
1312
1313 if (PartialContainer != this)
1314 throw new InternalErrorException ();
1315
1316 var base_context = new BaseContext (this);
1317 foreach (TypeParameter type_param in CurrentTypeParameters) {
1318 if (!type_param.ResolveConstraints (base_context)) {
1319 error = true;
1320 return false;
1321 }
1322 }
1323
1324 if (partial_parts != null) {
1325 foreach (TypeContainer part in partial_parts)
1326 UpdateTypeParameterConstraints (part);
1327 }
1328
1329 return true;
1330 }
1331
1332 protected virtual bool DefineNestedTypes ()
1333 {
1334 if (Types != null) {
1335 foreach (TypeContainer tc in Types)
1336 if (tc.DefineType () == null)
1337 return false;
1338 }
1339
1340 return true;
1341 }
1342
1343 TypeSpec CheckRecursiveDefinition (TypeContainer tc)
1344 {
1345 if (InTransit != null)
1346 return spec;
1347
1348 InTransit = tc;
1349
1350 if (base_type != null && base_type.Type != null) {
1351 var ptc = base_type.Type.MemberDefinition as TypeContainer;
1352 if (ptc != null && ptc.CheckRecursiveDefinition (this) != null)
1353 return base_type.Type;
1354 }
1355
1356 if (iface_exprs != null) {
1357 foreach (TypeExpr iface in iface_exprs) {
1358 // the interface might not have been resolved, prevents a crash, see #442144
1359 if (iface == null)
1360 continue;
1361 var ptc = iface.Type.MemberDefinition as Interface;
1362 if (ptc != null && ptc.CheckRecursiveDefinition (this) != null)
1363 return iface.Type;
1364 }
1365 }
1366
1367 if (!IsTopLevel && Parent.PartialContainer.CheckRecursiveDefinition (this) != null)
1368 return spec;
1369
1370 InTransit = null;
1371 return null;
1372 }
1373
1374 /// <summary>
1375 /// Populates our TypeBuilder with fields and methods
1376 /// </summary>
1377 public sealed override bool Define ()
1378 {
1379 if (members_defined)
1380 return members_defined_ok;
1381
1382 members_defined_ok = DoDefineMembers ();
1383 members_defined = true;
1384
1385 if (types != null) {
1386 foreach (var nested in types)
1387 nested.Define ();
1388 }
1389
1390 return members_defined_ok;
1391 }
1392
1393 protected virtual bool DoDefineMembers ()
1394 {
1395 if (iface_exprs != null) {
1396 foreach (TypeExpr iface in iface_exprs) {
1397 var iface_type = iface.Type;
1398
1399 // Ensure the base is always setup
1400 var compiled_iface = iface_type.MemberDefinition as Interface;
1401 if (compiled_iface != null)
1402 compiled_iface.Define ();
1403
1404 if (Kind == MemberKind.Interface)
1405 MemberCache.AddInterface (iface_type);
1406
1407 ObsoleteAttribute oa = iface_type.GetAttributeObsolete ();
1408 if (oa != null && !IsObsolete)
1409 AttributeTester.Report_ObsoleteMessage (oa, iface.GetSignatureForError (), Location, Report);
1410
1411 GenericTypeExpr ct = iface as GenericTypeExpr;
1412 if (ct != null) {
1413 // TODO: passing `this' is wrong, should be base type iface instead
1414 TypeManager.CheckTypeVariance (ct.Type, Variance.Covariant, this);
1415
1416 ct.CheckConstraints (this);
1417
1418 if (ct.HasDynamicArguments ()) {
1419 Report.Error (1966, iface.Location,
1420 "`{0}': cannot implement a dynamic interface `{1}'",
1421 GetSignatureForError (), iface.GetSignatureForError ());
1422 return false;
1423 }
1424 }
1425 }
1426 }
1427
1428 if (base_type != null) {
1429 ObsoleteAttribute obsolete_attr = base_type.Type.GetAttributeObsolete ();
1430 if (obsolete_attr != null && !IsObsolete)
1431 AttributeTester.Report_ObsoleteMessage (obsolete_attr, base_type.GetSignatureForError (), Location, Report);
1432
1433 var ct = base_type as GenericTypeExpr;
1434 if (ct != null)
1435 ct.CheckConstraints (this);
1436
1437 var baseContainer = base_type.Type.MemberDefinition as ClassOrStruct;
1438 if (baseContainer != null) {
1439 baseContainer.Define ();
1440
1441 //
1442 // It can trigger define of this type (for generic types only)
1443 //
1444 if (HasMembersDefined)
1445 return true;
1446 }
1447 }
1448
1449 if (type_params != null) {
1450 foreach (var tp in type_params) {
1451 tp.CheckGenericConstraints ();
1452 }
1453 }
1454
1455 if (!IsTopLevel) {
1456 MemberSpec candidate;
1457 var conflict_symbol = MemberCache.FindBaseMember (this, out candidate);
1458 if (conflict_symbol == null && candidate == null) {
1459 if ((ModFlags & Modifiers.NEW) != 0)
1460 Report.Warning (109, 4, Location, "The member `{0}' does not hide an inherited member. The new keyword is not required",
1461 GetSignatureForError ());
1462 } else {
1463 if ((ModFlags & Modifiers.NEW) == 0) {
1464 if (candidate == null)
1465 candidate = conflict_symbol;
1466
1467 Report.SymbolRelatedToPreviousError (candidate);
1468 Report.Warning (108, 2, Location, "`{0}' hides inherited member `{1}'. Use the new keyword if hiding was intended",
1469 GetSignatureForError (), candidate.GetSignatureForError ());
1470 }
1471 }
1472 }
1473
1474 DefineContainerMembers (constants);
1475 DefineContainerMembers (fields);
1476
1477 if (Kind == MemberKind.Struct || Kind == MemberKind.Class) {
1478 pending = PendingImplementation.GetPendingImplementations (this);
1479
1480 if (requires_delayed_unmanagedtype_check) {
1481 requires_delayed_unmanagedtype_check = false;
1482 foreach (FieldBase f in fields) {
1483 if (f.MemberType != null && f.MemberType.IsPointer)
1484 TypeManager.VerifyUnmanaged (Compiler, f.MemberType, f.Location);
1485 }
1486 }
1487 }
1488
1489 //
1490 // Constructors are not in the defined_names array
1491 //
1492 DefineContainerMembers (instance_constructors);
1493
1494 DefineContainerMembers (events);
1495 DefineContainerMembers (ordered_explicit_member_list);
1496 DefineContainerMembers (ordered_member_list);
1497
1498 if (operators != null) {
1499 DefineContainerMembers (operators);
1500 CheckPairedOperators ();
1501 }
1502
1503 ComputeIndexerName();
1504 CheckEqualsAndGetHashCode();
1505
1506 return true;
1507 }
1508
1509 protected virtual void DefineContainerMembers (System.Collections.IList mcal) // IList<MemberCore>
1510 {
1511 if (mcal != null) {
1512 foreach (MemberCore mc in mcal) {
1513 try {
1514 mc.Define ();
1515 } catch (Exception e) {
1516 throw new InternalErrorException (mc, e);
1517 }
1518 }
1519 }
1520 }
1521
1522 protected virtual void ComputeIndexerName ()
1523 {
1524 if (indexers == null)
1525 return;
1526
1527 string class_indexer_name = null;
1528
1529 //
1530 // If there's both an explicit and an implicit interface implementation, the
1531 // explicit one actually implements the interface while the other one is just
1532 // a normal indexer. See bug #37714.
1533 //
1534
1535 // Invariant maintained by AddIndexer(): All explicit interface indexers precede normal indexers
1536 foreach (Indexer i in indexers) {
1537 if (i.InterfaceType != null) {
1538 if (seen_normal_indexers)
1539 throw new Exception ("Internal Error: 'Indexers' array not sorted properly.");
1540 continue;
1541 }
1542
1543 seen_normal_indexers = true;
1544
1545 if (class_indexer_name == null) {
1546 class_indexer_name = i.ShortName;
1547 continue;
1548 }
1549
1550 if (i.ShortName != class_indexer_name)
1551 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");
1552 }
1553
1554 if (class_indexer_name != null)
1555 indexer_name = class_indexer_name;
1556 }
1557
1558 void EmitIndexerName ()
1559 {
1560 if (!seen_normal_indexers)
1561 return;
1562
1563 PredefinedAttribute pa = PredefinedAttributes.Get.DefaultMember;
1564 if (pa.Constructor == null &&
1565 !pa.ResolveConstructor (Location, TypeManager.string_type))
1566 return;
1567
1568 CustomAttributeBuilder cb = new CustomAttributeBuilder (pa.Constructor, new string [] { GetAttributeDefaultMember () });
1569 TypeBuilder.SetCustomAttribute (cb);
1570 }
1571
1572 protected virtual void CheckEqualsAndGetHashCode ()
1573 {
1574 if (methods == null)
1575 return;
1576
1577 if (HasEquals && !HasGetHashCode) {
1578 Report.Warning (659, 3, this.Location, "`{0}' overrides Object.Equals(object) but does not override Object.GetHashCode()", this.GetSignatureForError ());
1579 }
1580 }
1581
1582 // Indicated whether container has StructLayout attribute set Explicit
1583 public bool HasExplicitLayout {
1584 get { return (caching_flags & Flags.HasExplicitLayout) != 0; }
1585 set { caching_flags |= Flags.HasExplicitLayout; }
1586 }
1587
1588 public bool HasStructLayout {
1589 get { return (caching_flags & Flags.HasStructLayout) != 0; }
1590 set { caching_flags |= Flags.HasStructLayout; }
1591 }
1592
1593 public MemberCache MemberCache {
1594 get {
1595 return spec.MemberCache;
1596 }
1597 }
1598
1599 void CheckMemberUsage (List<MemberCore> al, string member_type)
1600 {
1601 if (al == null)
1602 return;
1603
1604 foreach (MemberCore mc in al) {
1605 if ((mc.ModFlags & Modifiers.AccessibilityMask) != Modifiers.PRIVATE)
1606 continue;
1607
1608 if (!mc.IsUsed && (mc.caching_flags & Flags.Excluded) == 0) {
1609 Report.Warning (169, 3, mc.Location, "The private {0} `{1}' is never used", member_type, mc.GetSignatureForError ());
1610 }
1611 }
1612 }
1613
1614 public virtual void VerifyMembers ()
1615 {
1616 //
1617 // Check for internal or private fields that were never assigned
1618 //
1619 if (Report.WarningLevel >= 3) {
1620 if (RootContext.EnhancedWarnings) {
1621 CheckMemberUsage (properties, "property");
1622 CheckMemberUsage (methods, "method");
1623 CheckMemberUsage (constants, "constant");
1624 }
1625
1626 if (fields != null){
1627 bool is_type_exposed = Kind == MemberKind.Struct || IsExposedFromAssembly ();
1628 foreach (FieldBase f in fields) {
1629 if ((f.ModFlags & Modifiers.AccessibilityMask) != Modifiers.PRIVATE) {
1630 if (is_type_exposed)
1631 continue;
1632
1633 f.SetIsUsed ();
1634 }
1635
1636 if (!f.IsUsed){
1637 if ((f.caching_flags & Flags.IsAssigned) == 0)
1638 Report.Warning (169, 3, f.Location, "The private field `{0}' is never used", f.GetSignatureForError ());
1639 else {
1640 Report.Warning (414, 3, f.Location, "The private field `{0}' is assigned but its value is never used",
1641 f.GetSignatureForError ());
1642 }
1643 continue;
1644 }
1645
1646 //
1647 // Only report 649 on level 4
1648 //
1649 if (Report.WarningLevel < 4)
1650 continue;
1651
1652 if ((f.caching_flags & Flags.IsAssigned) != 0)
1653 continue;
1654
1655 //
1656 // Don't be pendatic over serializable attributes
1657 //
1658 if (f.OptAttributes != null || PartialContainer.HasStructLayout)
1659 continue;
1660
1661 Constant c = New.Constantify (f.MemberType);
1662 Report.Warning (649, 4, f.Location, "Field `{0}' is never assigned to, and will always have its default value `{1}'",
1663 f.GetSignatureForError (), c == null ? "null" : c.AsString ());
1664 }
1665 }
1666 }
1667 }
1668
1669 public override void Emit ()
1670 {
1671 if (all_tp_builders != null) {
1672 int current_starts_index = CurrentTypeParametersStartIndex;
1673 for (int i = 0; i < all_tp_builders.Length; i++) {
1674 if (i < current_starts_index) {
1675 TypeParameters[i].EmitConstraints (all_tp_builders [i]);
1676 } else {
1677 CurrentTypeParameters [i - current_starts_index].Emit ();
1678 }
1679 }
1680 }
1681
1682 if ((ModFlags & Modifiers.COMPILER_GENERATED) != 0 && !Parent.IsCompilerGenerated)
1683 PredefinedAttributes.Get.CompilerGenerated.EmitAttribute (TypeBuilder);
1684
1685 base.Emit ();
1686 }
1687
1688 // TODO: move to ClassOrStruct
1689 void EmitConstructors ()
1690 {
1691 if (instance_constructors == null)
1692 return;
1693
1694 if (spec.IsAttribute && IsExposedFromAssembly () && RootContext.VerifyClsCompliance && IsClsComplianceRequired ()) {
1695 bool has_compliant_args = false;
1696
1697 foreach (Constructor c in instance_constructors) {
1698 try {
1699 c.Emit ();
1700 }
1701 catch (Exception e) {
1702 throw new InternalErrorException (c, e);
1703 }
1704
1705 if (has_compliant_args)
1706 continue;
1707
1708 has_compliant_args = c.HasCompliantArgs;
1709 }
1710 if (!has_compliant_args)
1711 Report.Warning (3015, 1, Location, "`{0}' has no accessible constructors which use only CLS-compliant types", GetSignatureForError ());
1712 } else {
1713 foreach (Constructor c in instance_constructors) {
1714 try {
1715 c.Emit ();
1716 }
1717 catch (Exception e) {
1718 throw new InternalErrorException (c, e);
1719 }
1720 }
1721 }
1722 }
1723
1724 /// <summary>
1725 /// Emits the code, this step is performed after all
1726 /// the types, enumerations, constructors
1727 /// </summary>
1728 public virtual void EmitType ()
1729 {
1730 if (OptAttributes != null)
1731 OptAttributes.Emit ();
1732
1733 Emit ();
1734
1735 EmitConstructors ();
1736
1737 if (constants != null)
1738 foreach (Const con in constants)
1739 con.Emit ();
1740
1741 if (default_static_constructor != null)
1742 default_static_constructor.Emit ();
1743
1744 if (operators != null)
1745 foreach (Operator o in operators)
1746 o.Emit ();
1747
1748 if (properties != null)
1749 foreach (Property p in properties)
1750 p.Emit ();
1751
1752 if (indexers != null) {
1753 foreach (Indexer indx in indexers)
1754 indx.Emit ();
1755 EmitIndexerName ();
1756 }
1757
1758 if (events != null){
1759 foreach (Event e in Events)
1760 e.Emit ();
1761 }
1762
1763 if (methods != null) {
1764 for (int i = 0; i < methods.Count; ++i)
1765 ((MethodOrOperator) methods [i]).Emit ();
1766 }
1767
1768 if (fields != null)
1769 foreach (FieldBase f in fields)
1770 f.Emit ();
1771
1772 if (types != null) {
1773 foreach (TypeContainer t in types)
1774 t.EmitType ();
1775 }
1776
1777 if (pending != null)
1778 pending.VerifyPendingMethods (Report);
1779
1780 if (Report.Errors > 0)
1781 return;
1782
1783 if (compiler_generated != null) {
1784 for (int i = 0; i < compiler_generated.Count; ++i)
1785 compiler_generated [i].EmitType ();
1786 }
1787 }
1788
1789 public void CloseType ()
1790 {
1791 if ((caching_flags & Flags.CloseTypeCreated) != 0)
1792 return;
1793
1794 // Close base type container first to avoid TypeLoadException
1795 if (spec.BaseType != null) {
1796 var btype = spec.BaseType.MemberDefinition as TypeContainer;
1797 if (btype != null)
1798 btype.CloseType ();
1799 }
1800
1801 try {
1802 caching_flags |= Flags.CloseTypeCreated;
1803 TypeBuilder.CreateType ();
1804 } catch (TypeLoadException){
1805 //
1806 // This is fine, the code still created the type
1807 //
1808 // Report.Warning (-20, "Exception while creating class: " + TypeBuilder.Name);
1809 // Console.WriteLine (e.Message);
1810 } catch (Exception e) {
1811 throw new InternalErrorException (this, e);
1812 }
1813
1814 if (Types != null){
1815 foreach (TypeContainer tc in Types)
1816 tc.CloseType ();
1817 }
1818
1819 if (compiler_generated != null)
1820 foreach (CompilerGeneratedClass c in compiler_generated)
1821 c.CloseType ();
1822
1823 types = null;
1824 fields = null;
1825 initialized_fields = null;
1826 initialized_static_fields = null;
1827 constants = null;
1828 ordered_explicit_member_list = null;
1829 ordered_member_list = null;
1830 methods = null;
1831 events = null;
1832 indexers = null;
1833 operators = null;
1834 compiler_generated = null;
1835 default_constructor = null;
1836 default_static_constructor = null;
1837 type_bases = null;
1838 OptAttributes = null;
1839 }
1840
1841 //
1842 // Performs the validation on a Method's modifiers (properties have
1843 // the same properties).
1844 //
1845 public bool MethodModifiersValid (MemberCore mc)
1846 {
1847 const Modifiers vao = (Modifiers.VIRTUAL | Modifiers.ABSTRACT | Modifiers.OVERRIDE);
1848 const Modifiers va = (Modifiers.VIRTUAL | Modifiers.ABSTRACT);
1849 const Modifiers nv = (Modifiers.NEW | Modifiers.VIRTUAL);
1850 bool ok = true;
1851 var flags = mc.ModFlags;
1852
1853 //
1854 // At most one of static, virtual or override
1855 //
1856 if ((flags & Modifiers.STATIC) != 0){
1857 if ((flags & vao) != 0){
1858 Report.Error (112, mc.Location, "A static member `{0}' cannot be marked as override, virtual or abstract",
1859 mc.GetSignatureForError ());
1860 ok = false;
1861 }
1862 }
1863
1864 if (Kind == MemberKind.Struct){
1865 if ((flags & va) != 0){
1866 ModifiersExtensions.Error_InvalidModifier (mc.Location, "virtual or abstract", Report);
1867 ok = false;
1868 }
1869 }
1870
1871 if ((flags & Modifiers.OVERRIDE) != 0 && (flags & nv) != 0){
1872 Report.Error (113, mc.Location, "A member `{0}' marked as override cannot be marked as new or virtual",
1873 mc.GetSignatureForError ());
1874 ok = false;
1875 }
1876
1877 //
1878 // If the declaration includes the abstract modifier, then the
1879 // declaration does not include static, virtual or extern
1880 //
1881 if ((flags & Modifiers.ABSTRACT) != 0){
1882 if ((flags & Modifiers.EXTERN) != 0){
1883 Report.Error (
1884 180, mc.Location, "`{0}' cannot be both extern and abstract", mc.GetSignatureForError ());
1885 ok = false;
1886 }
1887
1888 if ((flags & Modifiers.SEALED) != 0) {
1889 Report.Error (502, mc.Location, "`{0}' cannot be both abstract and sealed", mc.GetSignatureForError ());
1890 ok = false;
1891 }
1892
1893 if ((flags & Modifiers.VIRTUAL) != 0){
1894 Report.Error (503, mc.Location, "The abstract method `{0}' cannot be marked virtual", mc.GetSignatureForError ());
1895 ok = false;
1896 }
1897
1898 if ((ModFlags & Modifiers.ABSTRACT) == 0){
1899 Report.SymbolRelatedToPreviousError (this);
1900 Report.Error (513, mc.Location, "`{0}' is abstract but it is declared in the non-abstract class `{1}'",
1901 mc.GetSignatureForError (), GetSignatureForError ());
1902 ok = false;
1903 }
1904 }
1905
1906 if ((flags & Modifiers.PRIVATE) != 0){
1907 if ((flags & vao) != 0){
1908 Report.Error (621, mc.Location, "`{0}': virtual or abstract members cannot be private", mc.GetSignatureForError ());
1909 ok = false;
1910 }
1911 }
1912
1913 if ((flags & Modifiers.SEALED) != 0){
1914 if ((flags & Modifiers.OVERRIDE) == 0){
1915 Report.Error (238, mc.Location, "`{0}' cannot be sealed because it is not an override", mc.GetSignatureForError ());
1916 ok = false;
1917 }
1918 }
1919
1920 return ok;
1921 }
1922
1923 public Constructor DefaultStaticConstructor {
1924 get { return default_static_constructor; }
1925 }
1926
1927 protected override bool VerifyClsCompliance ()
1928 {
1929 if (!base.VerifyClsCompliance ())
1930 return false;
1931
1932 // Check this name against other containers
1933 NamespaceEntry.NS.VerifyClsCompliance ();
1934
1935 // Check all container names for user classes
1936 if (Kind != MemberKind.Delegate)
1937 MemberCache.VerifyClsCompliance (Definition, Report);
1938
1939 if (BaseType != null && !BaseType.IsCLSCompliant ()) {
1940 Report.Warning (3009, 1, Location, "`{0}': base type `{1}' is not CLS-compliant",
1941 GetSignatureForError (), BaseType.GetSignatureForError ());
1942 }
1943 return true;
1944 }
1945
1946 /// <summary>
1947 /// Performs checks for an explicit interface implementation. First it
1948 /// checks whether the `interface_type' is a base inteface implementation.
1949 /// Then it checks whether `name' exists in the interface type.
1950 /// </summary>
1951 public bool VerifyImplements (InterfaceMemberBase mb)
1952 {
1953 var ifaces = spec.Interfaces;
1954 if (ifaces != null) {
1955 foreach (TypeSpec t in ifaces){
1956 if (TypeManager.IsEqual (t, mb.InterfaceType))
1957 return true;
1958 }
1959 }
1960
1961 Report.SymbolRelatedToPreviousError (mb.InterfaceType);
1962 Report.Error (540, mb.Location, "`{0}': containing type does not implement interface `{1}'",
1963 mb.GetSignatureForError (), TypeManager.CSharpName (mb.InterfaceType));
1964 return false;
1965 }
1966
1967 //
1968 // Used for visiblity checks to tests whether this definition shares
1969 // base type baseType, it does member-definition search
1970 //
1971 public bool IsBaseTypeDefinition (TypeSpec baseType)
1972 {
1973 // RootContext check
1974 if (TypeBuilder == null)
1975 return false;
1976
1977 var type = spec;
1978 do {
1979 if (type.MemberDefinition == baseType.MemberDefinition)
1980 return true;
1981
1982 type = type.BaseType;
1983 } while (type != null);
1984
1985 return false;
1986 }
1987
1988 public MemberCache LoadMembers (TypeSpec declaringType)
1989 {
1990 throw new NotSupportedException ("Not supported for compiled definition " + GetSignatureForError ());
1991 }
1992
1993 public void Mark_HasEquals ()
1994 {
1995 cached_method |= CachedMethods.Equals;
1996 }
1997
1998 public void Mark_HasGetHashCode ()
1999 {
2000 cached_method |= CachedMethods.GetHashCode;
2001 }
2002
2003 /// <summary>
2004 /// Method container contains Equals method
2005 /// </summary>
2006 public bool HasEquals {
2007 get {
2008 return (cached_method & CachedMethods.Equals) != 0;
2009 }
2010 }
2011
2012 /// <summary>
2013 /// Method container contains GetHashCode method
2014 /// </summary>
2015 public bool HasGetHashCode {
2016 get {
2017 return (cached_method & CachedMethods.GetHashCode) != 0;
2018 }
2019 }
2020
2021 public bool HasStaticFieldInitializer {
2022 get {
2023 return (cached_method & CachedMethods.HasStaticFieldInitializer) != 0;
2024 }
2025 set {
2026 if (value)
2027 cached_method |= CachedMethods.HasStaticFieldInitializer;
2028 else
2029 cached_method &= ~CachedMethods.HasStaticFieldInitializer;
2030 }
2031 }
2032
2033 //
2034 // Generates xml doc comments (if any), and if required,
2035 // handle warning report.
2036 //
2037 internal override void GenerateDocComment (DeclSpace ds)
2038 {
2039 DocUtil.GenerateTypeDocComment (this, ds, Report);
2040 }
2041
2042 public override string DocCommentHeader {
2043 get { return "T:"; }
2044 }
2045 }
2046
2047 public abstract class ClassOrStruct : TypeContainer
2048 {
2049 Dictionary<SecurityAction, PermissionSet> declarative_security;
2050
2051 public ClassOrStruct (NamespaceEntry ns, DeclSpace parent,
2052 MemberName name, Attributes attrs, MemberKind kind)
2053 : base (ns, parent, name, attrs, kind)
2054 {
2055 }
2056
2057 protected override bool AddToContainer (MemberCore symbol, string name)
2058 {
2059 if (name == MemberName.Name) {
2060 if (symbol is TypeParameter) {
2061 Report.Error (694, symbol.Location,
2062 "Type parameter `{0}' has same name as containing type, or method",
2063 symbol.GetSignatureForError ());
2064 return false;
2065 }
2066
2067 InterfaceMemberBase imb = symbol as InterfaceMemberBase;
2068 if (imb == null || !imb.IsExplicitImpl) {
2069 Report.SymbolRelatedToPreviousError (this);
2070 Report.Error (542, symbol.Location, "`{0}': member names cannot be the same as their enclosing type",
2071 symbol.GetSignatureForError ());
2072 return false;
2073 }
2074 }
2075
2076 return base.AddToContainer (symbol, name);
2077 }
2078
2079 public override void VerifyMembers ()
2080 {
2081 base.VerifyMembers ();
2082
2083 if ((events != null) && Report.WarningLevel >= 3) {
2084 foreach (Event e in events){
2085 // Note: The event can be assigned from same class only, so we can report
2086 // this warning for all accessibility modes
2087 if ((e.caching_flags & Flags.IsUsed) == 0)
2088 Report.Warning (67, 3, e.Location, "The event `{0}' is never used", e.GetSignatureForError ());
2089 }
2090 }
2091 }
2092
2093 public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
2094 {
2095 if (a.IsValidSecurityAttribute ()) {
2096 if (declarative_security == null)
2097 declarative_security = new Dictionary<SecurityAction, PermissionSet> ();
2098
2099 a.ExtractSecurityPermissionSet (declarative_security);
2100 return;
2101 }
2102
2103 if (a.Type == pa.StructLayout) {
2104 PartialContainer.HasStructLayout = true;
2105
2106 if (a.GetLayoutKindValue () == LayoutKind.Explicit)
2107 PartialContainer.HasExplicitLayout = true;
2108 }
2109
2110 if (a.Type == pa.Dynamic) {
2111 a.Error_MisusedDynamicAttribute ();
2112 return;
2113 }
2114
2115 base.ApplyAttributeBuilder (a, ctor, cdata, pa);
2116 }
2117
2118 /// <summary>
2119 /// Defines the default constructors
2120 /// </summary>
2121 protected void DefineDefaultConstructor (bool is_static)
2122 {
2123 // The default instance constructor is public
2124 // If the class is abstract, the default constructor is protected
2125 // The default static constructor is private
2126
2127 Modifiers mods;
2128 if (is_static) {
2129 mods = Modifiers.STATIC | Modifiers.PRIVATE;
2130 } else {
2131 mods = ((ModFlags & Modifiers.ABSTRACT) != 0) ? Modifiers.PROTECTED : Modifiers.PUBLIC;
2132 }
2133
2134 Constructor c = new Constructor (this, MemberName.Name, mods,
2135 null, ParametersCompiled.EmptyReadOnlyParameters,
2136 new GeneratedBaseInitializer (Location),
2137 Location);
2138
2139 AddConstructor (c);
2140 c.Block = new ToplevelBlock (Compiler, ParametersCompiled.EmptyReadOnlyParameters, Location);
2141 }
2142
2143 protected override bool DoDefineMembers ()
2144 {
2145 CheckProtectedModifier ();
2146
2147 base.DoDefineMembers ();
2148
2149 if (default_static_constructor != null)
2150 default_static_constructor.Define ();
2151
2152 return true;
2153 }
2154
2155 public override void Emit ()
2156 {
2157 if (default_static_constructor == null && PartialContainer.HasStaticFieldInitializer) {
2158 DefineDefaultConstructor (true);
2159 default_static_constructor.Define ();
2160 }
2161
2162 base.Emit ();
2163
2164 if (declarative_security != null) {
2165 foreach (var de in declarative_security) {
2166 TypeBuilder.AddDeclarativeSecurity (de.Key, de.Value);
2167 }
2168 }
2169 }
2170
2171 public override ExtensionMethodGroupExpr LookupExtensionMethod (TypeSpec extensionType, string name, int arity, Location loc)
2172 {
2173 DeclSpace top_level = Parent;
2174 if (top_level != null) {
2175 while (top_level.Parent != null)
2176 top_level = top_level.Parent;
2177
2178 var candidates = NamespaceEntry.NS.LookupExtensionMethod (extensionType, this, name, arity);
2179 if (candidates != null)
2180 return new ExtensionMethodGroupExpr (candidates, NamespaceEntry, extensionType, loc);
2181 }
2182
2183 return NamespaceEntry.LookupExtensionMethod (extensionType, name, arity, loc);
2184 }
2185
2186 protected override TypeAttributes TypeAttr {
2187 get {
2188 if (default_static_constructor == null)
2189 return base.TypeAttr | TypeAttributes.BeforeFieldInit;
2190
2191 return base.TypeAttr;
2192 }
2193 }
2194 }
2195
2196
2197 // TODO: should be sealed
2198 public class Class : ClassOrStruct {
2199 const Modifiers AllowedModifiers =
2200 Modifiers.NEW |
2201 Modifiers.PUBLIC |
2202 Modifiers.PROTECTED |
2203 Modifiers.INTERNAL |
2204 Modifiers.PRIVATE |
2205 Modifiers.ABSTRACT |
2206 Modifiers.SEALED |
2207 Modifiers.STATIC |
2208 Modifiers.UNSAFE;
2209
2210 public const TypeAttributes StaticClassAttribute = TypeAttributes.Abstract | TypeAttributes.Sealed;
2211
2212 public Class (NamespaceEntry ns, DeclSpace parent, MemberName name, Modifiers mod,
2213 Attributes attrs)
2214 : base (ns, parent, name, attrs, MemberKind.Class)
2215 {
2216 var accmods = (Parent == null || Parent.Parent == null) ? Modifiers.INTERNAL : Modifiers.PRIVATE;
2217 this.ModFlags = ModifiersExtensions.Check (AllowedModifiers, mod, accmods, Location, Report);
2218 spec = new TypeSpec (Kind, null, this, null, ModFlags);
2219
2220 if (IsStatic && RootContext.Version == LanguageVersion.ISO_1) {
2221 Report.FeatureIsNotAvailable (Location, "static classes");
2222 }
2223 }
2224
2225 public override void AddBasesForPart (DeclSpace part, List<FullNamedExpression> bases)
2226 {
2227 if (part.Name == "System.Object")
2228 Report.Error (537, part.Location,
2229 "The class System.Object cannot have a base class or implement an interface.");
2230 base.AddBasesForPart (part, bases);
2231 }
2232
2233 public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
2234 {
2235 if (a.Type == pa.AttributeUsage) {
2236 if (!BaseType.IsAttribute && spec != TypeManager.attribute_type) {
2237 Report.Error (641, a.Location, "Attribute `{0}' is only valid on classes derived from System.Attribute", a.GetSignatureForError ());
2238 }
2239 }
2240
2241 if (a.Type == pa.Conditional && !BaseType.IsAttribute) {
2242 Report.Error (1689, a.Location, "Attribute `System.Diagnostics.ConditionalAttribute' is only valid on methods or attribute classes");
2243 return;
2244 }
2245
2246 if (a.Type == pa.ComImport && !attributes.Contains (pa.Guid)) {
2247 a.Error_MissingGuidAttribute ();
2248 return;
2249 }
2250
2251 if (a.Type == pa.Extension) {
2252 a.Error_MisusedExtensionAttribute ();
2253 return;
2254 }
2255
2256 if (a.Type.IsConditionallyExcluded (Location))
2257 return;
2258
2259 base.ApplyAttributeBuilder (a, ctor, cdata, pa);
2260 }
2261
2262 public override AttributeTargets AttributeTargets {
2263 get {
2264 return AttributeTargets.Class;
2265 }
2266 }
2267
2268 protected override void DefineContainerMembers (System.Collections.IList list)
2269 {
2270 if (list == null)
2271 return;
2272
2273 if (!IsStatic) {
2274 base.DefineContainerMembers (list);
2275 return;
2276 }
2277
2278 foreach (MemberCore m in list) {
2279 if (m is Operator) {
2280 Report.Error (715, m.Location, "`{0}': Static classes cannot contain user-defined operators", m.GetSignatureForError ());
2281 continue;
2282 }
2283
2284 if (m is Destructor) {
2285 Report.Error (711, m.Location, "`{0}': Static classes cannot contain destructor", GetSignatureForError ());
2286 continue;
2287 }
2288
2289 if (m is Indexer) {
2290 Report.Error (720, m.Location, "`{0}': cannot declare indexers in a static class", m.GetSignatureForError ());
2291 continue;
2292 }
2293
2294 if ((m.ModFlags & Modifiers.STATIC) != 0 || m is Enum || m is Delegate)
2295 continue;
2296
2297 if (m is Constructor) {
2298 Report.Error (710, m.Location, "`{0}': Static classes cannot have instance constructors", GetSignatureForError ());
2299 continue;
2300 }
2301
2302 Method method = m as Method;
2303 if (method != null && method.ParameterInfo.HasExtensionMethodType) {
2304 Report.Error (1105, m.Location, "`{0}': Extension methods must be declared static", m.GetSignatureForError ());
2305 continue;
2306 }
2307
2308 Report.Error (708, m.Location, "`{0}': cannot declare instance members in a static class", m.GetSignatureForError ());
2309 }
2310
2311 base.DefineContainerMembers (list);
2312 }
2313
2314 protected override bool DoDefineMembers ()
2315 {
2316 if ((ModFlags & Modifiers.ABSTRACT) == Modifiers.ABSTRACT && (ModFlags & (Modifiers.SEALED | Modifiers.STATIC)) != 0) {
2317 Report.Error (418, Location, "`{0}': an abstract class cannot be sealed or static", GetSignatureForError ());
2318 }
2319
2320 if ((ModFlags & (Modifiers.SEALED | Modifiers.STATIC)) == (Modifiers.SEALED | Modifiers.STATIC)) {
2321 Report.Error (441, Location, "`{0}': a class cannot be both static and sealed", GetSignatureForError ());
2322 }
2323
2324 if (InstanceConstructors == null && !IsStatic)
2325 DefineDefaultConstructor (false);
2326
2327 return base.DoDefineMembers ();
2328 }
2329
2330 public override void Emit ()
2331 {
2332 base.Emit ();
2333
2334 if ((ModFlags & Modifiers.METHOD_EXTENSION) != 0)
2335 PredefinedAttributes.Get.Extension.EmitAttribute (TypeBuilder);
2336 }
2337
2338 protected override TypeExpr[] ResolveBaseTypes (out TypeExpr base_class)
2339 {
2340 TypeExpr[] ifaces = base.ResolveBaseTypes (out base_class);
2341
2342 if (base_class == null) {
2343 if (spec != TypeManager.object_type)
2344 base_class = TypeManager.system_object_expr;
2345 } else {
2346 var base_type = base_class.Type;
2347
2348 if (base_type.IsGenericParameter){
2349 Report.Error (689, base_class.Location, "`{0}': Cannot derive from type parameter `{1}'",
2350 GetSignatureForError (), base_type.GetSignatureForError ());
2351 } else if (IsGeneric && base_type.IsAttribute) {
2352 Report.Error (698, base_class.Location,
2353 "A generic type cannot derive from `{0}' because it is an attribute class",
2354 base_class.GetSignatureForError ());
2355 } else if (base_type.IsStatic) {
2356 Report.SymbolRelatedToPreviousError (base_class.Type);
2357 Report.Error (709, Location, "`{0}': Cannot derive from static class `{1}'",
2358 GetSignatureForError (), base_type.GetSignatureForError ());
2359 } else if (base_type.IsSealed){
2360 Report.SymbolRelatedToPreviousError (base_class.Type);
2361 Report.Error (509, Location, "`{0}': cannot derive from sealed type `{1}'",
2362 GetSignatureForError (), base_type.GetSignatureForError ());
2363 }
2364
2365 if (base_type is PredefinedTypeSpec && !(spec is PredefinedTypeSpec) &&
2366 (base_type == TypeManager.enum_type || base_type == TypeManager.value_type || base_type == TypeManager.multicast_delegate_type ||
2367 base_type == TypeManager.delegate_type || base_type == TypeManager.array_type)) {
2368 Report.Error (644, Location, "`{0}' cannot derive from special class `{1}'",
2369 GetSignatureForError (), base_type.GetSignatureForError ());
2370 base_class = TypeManager.system_object_expr;
2371 }
2372
2373 if (!IsAccessibleAs (base_type)) {
2374 Report.SymbolRelatedToPreviousError (base_type);
2375 Report.Error (60, Location, "Inconsistent accessibility: base class `{0}' is less accessible than class `{1}'",
2376 base_type.GetSignatureForError (), GetSignatureForError ());
2377 }
2378 }
2379
2380 if (PartialContainer.IsStatic) {
2381 if (base_class.Type != TypeManager.object_type) {
2382 Report.Error (713, Location, "Static class `{0}' cannot derive from type `{1}'. Static classes must derive from object",
2383 GetSignatureForError (), base_class.GetSignatureForError ());
2384 return ifaces;
2385 }
2386
2387 if (ifaces != null) {
2388 foreach (TypeExpr t in ifaces)
2389 Report.SymbolRelatedToPreviousError (t.Type);
2390 Report.Error (714, Location, "Static class `{0}' cannot implement interfaces", GetSignatureForError ());
2391 }
2392 }
2393
2394 return ifaces;
2395 }
2396
2397 /// Search for at least one defined condition in ConditionalAttribute of attribute class
2398 /// Valid only for attribute classes.
2399 public override string[] ConditionalConditions ()
2400 {
2401 if ((caching_flags & (Flags.Excluded_Undetected | Flags.Excluded)) == 0)
2402 return null;
2403
2404 caching_flags &= ~Flags.Excluded_Undetected;
2405
2406 if (OptAttributes == null)
2407 return null;
2408
2409 Attribute[] attrs = OptAttributes.SearchMulti (PredefinedAttributes.Get.Conditional);
2410 if (attrs == null)
2411 return null;
2412
2413 string[] conditions = new string[attrs.Length];
2414 for (int i = 0; i < conditions.Length; ++i)
2415 conditions[i] = attrs[i].GetConditionalAttributeValue ();
2416
2417 caching_flags |= Flags.Excluded;
2418 return conditions;
2419 }
2420
2421 //
2422 // FIXME: How do we deal with the user specifying a different
2423 // layout?
2424 //
2425 protected override TypeAttributes TypeAttr {
2426 get {
2427 TypeAttributes ta = base.TypeAttr | TypeAttributes.AutoLayout | TypeAttributes.Class;
2428 if (IsStatic)
2429 ta |= StaticClassAttribute;
2430 return ta;
2431 }
2432 }
2433 }
2434
2435 public sealed class Struct : ClassOrStruct {
2436
2437 bool is_unmanaged, has_unmanaged_check_done;
2438 bool InTransit;
2439
2440 // <summary>
2441 // Modifiers allowed in a struct declaration
2442 // </summary>
2443 const Modifiers AllowedModifiers =
2444 Modifiers.NEW |
2445 Modifiers.PUBLIC |
2446 Modifiers.PROTECTED |
2447 Modifiers.INTERNAL |
2448 Modifiers.UNSAFE |
2449 Modifiers.PRIVATE;
2450
2451 public Struct (NamespaceEntry ns, DeclSpace parent, MemberName name,
2452 Modifiers mod, Attributes attrs)
2453 : base (ns, parent, name, attrs, MemberKind.Struct)
2454 {
2455 var accmods = parent.Parent == null ? Modifiers.INTERNAL : Modifiers.PRIVATE;
2456 this.ModFlags = ModifiersExtensions.Check (AllowedModifiers, mod, accmods, Location, Report) | Modifiers.SEALED ;
2457 spec = new TypeSpec (Kind, null, this, null, ModFlags);
2458 }
2459
2460 public override AttributeTargets AttributeTargets {
2461 get {
2462 return AttributeTargets.Struct;
2463 }
2464 }
2465
2466 public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
2467 {
2468 base.ApplyAttributeBuilder (a, ctor, cdata, pa);
2469
2470 //
2471 // When struct constains fixed fixed and struct layout has explicitly
2472 // set CharSet, its value has to be propagated to compiler generated
2473 // fixed field types
2474 //
2475 if (a.Type == pa.StructLayout && Fields != null && a.HasField ("CharSet")) {
2476 for (int i = 0; i < Fields.Count; ++i) {
2477 FixedField ff = Fields [i] as FixedField;
2478 if (ff != null)
2479 ff.SetCharSet (TypeBuilder.Attributes);
2480 }
2481 }
2482 }
2483
2484 bool CheckStructCycles (Struct s)
2485 {
2486 if (s.Fields == null)
2487 return true;
2488
2489 if (s.InTransit)
2490 return false;
2491
2492 s.InTransit = true;
2493 foreach (FieldBase field in s.Fields) {
2494 TypeSpec ftype = field.Spec.MemberType;
2495 if (!ftype.IsStruct)
2496 continue;
2497
2498 if (ftype is PredefinedTypeSpec)
2499 continue;
2500
2501 foreach (var targ in ftype.TypeArguments) {
2502 if (!CheckFieldTypeCycle (targ)) {
2503 Report.Error (523, field.Location,
2504 "Struct member `{0}' of type `{1}' causes a cycle in the struct layout",
2505 field.GetSignatureForError (), ftype.GetSignatureForError ());
2506 break;
2507 }
2508 }
2509
2510 if ((field.IsStatic && (!ftype.IsGeneric || ftype == CurrentType)))
2511 continue;
2512
2513 if (!CheckFieldTypeCycle (ftype)) {
2514 Report.Error (523, field.Location,
2515 "Struct member `{0}' of type `{1}' causes a cycle in the struct layout",
2516 field.GetSignatureForError (), ftype.GetSignatureForError ());
2517 break;
2518 }
2519 }
2520
2521 s.InTransit = false;
2522 return true;
2523 }
2524
2525 bool CheckFieldTypeCycle (TypeSpec ts)
2526 {
2527 var fts = ts.MemberDefinition as Struct;
2528 if (fts == null)
2529 return true;
2530
2531 return CheckStructCycles (fts);
2532 }
2533
2534 public override void Emit ()
2535 {
2536 CheckStructCycles (this);
2537
2538 base.Emit ();
2539 }
2540
2541 public override bool IsUnmanagedType ()
2542 {
2543 if (fields == null)
2544 return true;
2545
2546 if (has_unmanaged_check_done)
2547 return is_unmanaged;
2548
2549 if (requires_delayed_unmanagedtype_check)
2550 return true;
2551
2552 requires_delayed_unmanagedtype_check = true;
2553
2554 foreach (FieldBase f in fields) {
2555 if (f.IsStatic)
2556 continue;
2557
2558 // It can happen when recursive unmanaged types are defined
2559 // struct S { S* s; }
2560 TypeSpec mt = f.MemberType;
2561 if (mt == null) {
2562 return true;
2563 }
2564
2565 while (mt.IsPointer)
2566 mt = TypeManager.GetElementType (mt);
2567
2568 if (mt.MemberDefinition == this) {
2569 for (var p = Parent; p != null; p = p.Parent) {
2570 if (p.Kind == MemberKind.Class) {
2571 has_unmanaged_check_done = true;
2572 return false;
2573 }
2574 }
2575 continue;
2576 }
2577
2578 if (TypeManager.IsUnmanagedType (mt))
2579 continue;
2580
2581 has_unmanaged_check_done = true;
2582 return false;
2583 }
2584
2585 has_unmanaged_check_done = true;
2586 is_unmanaged = true;
2587 return true;
2588 }
2589
2590 protected override TypeExpr[] ResolveBaseTypes (out TypeExpr base_class)
2591 {
2592 TypeExpr[] ifaces = base.ResolveBaseTypes (out base_class);
2593 base_class = TypeManager.system_valuetype_expr;
2594 return ifaces;
2595 }
2596
2597 protected override TypeAttributes TypeAttr {
2598 get {
2599 const TypeAttributes DefaultTypeAttributes =
2600 TypeAttributes.SequentialLayout |
2601 TypeAttributes.Sealed;
2602
2603 return base.TypeAttr | DefaultTypeAttributes;
2604 }
2605 }
2606
2607 public override void RegisterFieldForInitialization (MemberCore field, FieldInitializer expression)
2608 {
2609 if ((field.ModFlags & Modifiers.STATIC) == 0) {
2610 Report.Error (573, field.Location, "`{0}': Structs cannot have instance field initializers",
2611 field.GetSignatureForError ());
2612 return;
2613 }
2614 base.RegisterFieldForInitialization (field, expression);
2615 }
2616
2617 }
2618
2619 /// <summary>
2620 /// Interfaces
2621 /// </summary>
2622 public sealed class Interface : TypeContainer {
2623
2624 /// <summary>
2625 /// Modifiers allowed in a class declaration
2626 /// </summary>
2627 public const Modifiers AllowedModifiers =
2628 Modifiers.NEW |
2629 Modifiers.PUBLIC |
2630 Modifiers.PROTECTED |
2631 Modifiers.INTERNAL |
2632 Modifiers.UNSAFE |
2633 Modifiers.PRIVATE;
2634
2635 public Interface (NamespaceEntry ns, DeclSpace parent, MemberName name, Modifiers mod,
2636 Attributes attrs)
2637 : base (ns, parent, name, attrs, MemberKind.Interface)
2638 {
2639 var accmods = parent.Parent == null ? Modifiers.INTERNAL : Modifiers.PRIVATE;
2640
2641 this.ModFlags = ModifiersExtensions.Check (AllowedModifiers, mod, accmods, name.Location, Report);
2642 spec = new TypeSpec (Kind, null, this, null, ModFlags);
2643 }
2644
2645 public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
2646 {
2647 if (a.Type == pa.ComImport && !attributes.Contains (pa.Guid)) {
2648 a.Error_MissingGuidAttribute ();
2649 return;
2650 }
2651
2652 base.ApplyAttributeBuilder (a, ctor, cdata, pa);
2653 }
2654
2655
2656 public override AttributeTargets AttributeTargets {
2657 get {
2658 return AttributeTargets.Interface;
2659 }
2660 }
2661
2662 protected override TypeAttributes TypeAttr {
2663 get {
2664 const TypeAttributes DefaultTypeAttributes =
2665 TypeAttributes.AutoLayout |
2666 TypeAttributes.Abstract |
2667 TypeAttributes.Interface;
2668
2669 return base.TypeAttr | DefaultTypeAttributes;
2670 }
2671 }
2672
2673 protected override bool VerifyClsCompliance ()
2674 {
2675 if (!base.VerifyClsCompliance ())
2676 return false;
2677
2678 if (iface_exprs != null) {
2679 foreach (var iface in iface_exprs) {
2680 if (iface.Type.IsCLSCompliant ())
2681 continue;
2682
2683 Report.SymbolRelatedToPreviousError (iface.Type);
2684 Report.Warning (3027, 1, Location, "`{0}' is not CLS-compliant because base interface `{1}' is not CLS-compliant",
2685 GetSignatureForError (), TypeManager.CSharpName (iface.Type));
2686 }
2687 }
2688
2689 return true;
2690 }
2691 }
2692
2693 public abstract class InterfaceMemberBase : MemberBase {
2694 //
2695 // Whether this is an interface member.
2696 //
2697 public bool IsInterface;
2698
2699 //
2700 // If true, this is an explicit interface implementation
2701 //
2702 public bool IsExplicitImpl;
2703
2704 protected bool is_external_implementation;
2705
2706 //
2707 // The interface type we are explicitly implementing
2708 //
2709 public TypeSpec InterfaceType;
2710
2711 //
2712 // The method we're overriding if this is an override method.
2713 //
2714 protected MethodSpec base_method;
2715
2716 readonly Modifiers explicit_mod_flags;
2717 public MethodAttributes flags;
2718
2719 public InterfaceMemberBase (DeclSpace parent, GenericMethod generic,
2720 FullNamedExpression type, Modifiers mod, Modifiers allowed_mod,
2721 MemberName name, Attributes attrs)
2722 : base (parent, generic, type, mod, allowed_mod, Modifiers.PRIVATE,
2723 name, attrs)
2724 {
2725 IsInterface = parent.PartialContainer.Kind == MemberKind.Interface;
2726 IsExplicitImpl = (MemberName.Left != null);
2727 explicit_mod_flags = mod;
2728 }
2729
2730 protected override bool CheckBase ()
2731 {
2732 if (!base.CheckBase ())
2733 return false;
2734
2735 if ((caching_flags & Flags.MethodOverloadsExist) != 0)
2736 CheckForDuplications ();
2737
2738 if (IsExplicitImpl)
2739 return true;
2740
2741 // For System.Object only
2742 if (Parent.BaseType == null)
2743 return true;
2744
2745 MemberSpec candidate;
2746 var base_member = FindBaseMember (out candidate);
2747
2748 if ((ModFlags & Modifiers.OVERRIDE) != 0) {
2749 if (base_member == null) {
2750 if (candidate == null) {
2751 if (this is Method && ((Method)this).ParameterInfo.IsEmpty && MemberName.Name == Destructor.MetadataName && MemberName.Arity == 0) {
2752 Report.Error (249, Location, "Do not override `{0}'. Use destructor syntax instead",
2753 "object.Finalize()");
2754 } else {
2755 Report.Error (115, Location, "`{0}' is marked as an override but no suitable {1} found to override",
2756 GetSignatureForError (), SimpleName.GetMemberType (this));
2757 }
2758 } else {
2759 Report.SymbolRelatedToPreviousError (candidate);
2760 if (this is Event)
2761 Report.Error (72, Location, "`{0}': cannot override because `{1}' is not an event",
2762 GetSignatureForError (), TypeManager.GetFullNameSignature (candidate));
2763 else if (this is PropertyBase)
2764 Report.Error (544, Location, "`{0}': cannot override because `{1}' is not a property",
2765 GetSignatureForError (), TypeManager.GetFullNameSignature (candidate));
2766 else
2767 Report.Error (505, Location, "`{0}': cannot override because `{1}' is not a method",
2768 GetSignatureForError (), TypeManager.GetFullNameSignature (candidate));
2769 }
2770
2771 return false;
2772 }
2773
2774 if (!CheckOverrideAgainstBase (base_member))
2775 return false;
2776
2777 ObsoleteAttribute oa = base_member.GetAttributeObsolete ();
2778 if (oa != null) {
2779 if (OptAttributes == null || !OptAttributes.Contains (PredefinedAttributes.Get.Obsolete)) {
2780 Report.SymbolRelatedToPreviousError (base_member);
2781 Report.Warning (672, 1, Location, "Member `{0}' overrides obsolete member `{1}'. Add the Obsolete attribute to `{0}'",
2782 GetSignatureForError (), TypeManager.GetFullNameSignature (base_member));
2783 }
2784 } else {
2785 if (OptAttributes != null && OptAttributes.Contains (PredefinedAttributes.Get.Obsolete)) {
2786 Report.SymbolRelatedToPreviousError (base_member);
2787 Report.Warning (809, 1, Location, "Obsolete member `{0}' overrides non-obsolete member `{1}'",
2788 GetSignatureForError (), TypeManager.GetFullNameSignature (base_member));
2789 }
2790 }
2791
2792 base_method = base_member as MethodSpec;
2793 return true;
2794 }
2795
2796 if (base_member == null && candidate != null && (!(candidate is IParametersMember) || !(this is IParametersMember)))
2797 base_member = candidate;
2798
2799 if (base_member == null) {
2800 if ((ModFlags & Modifiers.NEW) != 0) {
2801 if (base_member == null) {
2802 Report.Warning (109, 4, Location, "The member `{0}' does not hide an inherited member. The new keyword is not required",
2803 GetSignatureForError ());
2804 }
2805 }
2806 } else {
2807 if ((ModFlags & Modifiers.NEW) == 0) {
2808 ModFlags |= Modifiers.NEW;
2809 Report.SymbolRelatedToPreviousError (base_member);
2810 if (!IsInterface && (base_member.Modifiers & (Modifiers.ABSTRACT | Modifiers.VIRTUAL | Modifiers.OVERRIDE)) != 0) {
2811 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",
2812 GetSignatureForError (), base_member.GetSignatureForError ());
2813 } else {
2814 Report.Warning (108, 2, Location, "`{0}' hides inherited member `{1}'. Use the new keyword if hiding was intended",
2815 GetSignatureForError (), base_member.GetSignatureForError ());
2816 }
2817 }
2818
2819 if (!IsInterface && base_member.IsAbstract) {
2820 Report.SymbolRelatedToPreviousError (base_member);
2821 Report.Error (533, Location, "`{0}' hides inherited abstract member `{1}'",
2822 GetSignatureForError (), base_member.GetSignatureForError ());
2823 }
2824 }
2825
2826 return true;
2827 }
2828
2829 protected virtual bool CheckForDuplications ()
2830 {
2831 return Parent.MemberCache.CheckExistingMembersOverloads (this, ParametersCompiled.EmptyReadOnlyParameters);
2832 }
2833
2834 //
2835 // Performs various checks on the MethodInfo `mb' regarding the modifier flags
2836 // that have been defined.
2837 //
2838 protected virtual bool CheckOverrideAgainstBase (MemberSpec base_member)
2839 {
2840 bool ok = true;
2841
2842 if ((base_member.Modifiers & (Modifiers.ABSTRACT | Modifiers.VIRTUAL | Modifiers.OVERRIDE | Modifiers.OVERRIDE_UNCHECKED)) == 0) {
2843 Report.SymbolRelatedToPreviousError (base_member);
2844 Report.Error (506, Location,
2845 "`{0}': cannot override inherited member `{1}' because it is not marked virtual, abstract or override",
2846 GetSignatureForError (), TypeManager.CSharpSignature (base_member));
2847 ok = false;
2848 }
2849
2850 // Now we check that the overriden method is not final
2851 if ((base_member.Modifiers & Modifiers.SEALED) != 0) {
2852 Report.SymbolRelatedToPreviousError (base_member);
2853 Report.Error (239, Location, "`{0}': cannot override inherited member `{1}' because it is sealed",
2854 GetSignatureForError (), TypeManager.CSharpSignature (base_member));
2855 ok = false;
2856 }
2857
2858 var base_member_type = ((IInterfaceMemberSpec) base_member).MemberType;
2859 if (!TypeSpecComparer.Override.IsEqual (MemberType, base_member_type)) {
2860 Report.SymbolRelatedToPreviousError (base_member);
2861 if (this is PropertyBasedMember) {
2862 Report.Error (1715, Location, "`{0}': type must be `{1}' to match overridden member `{2}'",
2863 GetSignatureForError (), TypeManager.CSharpName (base_member_type), TypeManager.CSharpSignature (base_member));
2864 } else {
2865 Report.Error (508, Location, "`{0}': return type must be `{1}' to match overridden member `{2}'",
2866 GetSignatureForError (), TypeManager.CSharpName (base_member_type), TypeManager.CSharpSignature (base_member));
2867 }
2868 ok = false;
2869 }
2870
2871 return ok;
2872 }
2873
2874 protected static bool CheckAccessModifiers (MemberCore this_member, MemberSpec base_member)
2875 {
2876 var thisp = this_member.ModFlags & Modifiers.AccessibilityMask;
2877 var base_classp = base_member.Modifiers & Modifiers.AccessibilityMask;
2878
2879 if ((base_classp & (Modifiers.PROTECTED | Modifiers.INTERNAL)) == (Modifiers.PROTECTED | Modifiers.INTERNAL)) {
2880 //
2881 // when overriding protected internal, the method can be declared
2882 // protected internal only within the same assembly or assembly
2883 // which has InternalsVisibleTo
2884 //
2885 if ((thisp & (Modifiers.PROTECTED | Modifiers.INTERNAL)) == (Modifiers.PROTECTED | Modifiers.INTERNAL)) {
2886 return TypeManager.IsThisOrFriendAssembly (this_member.Assembly, base_member.Assembly);
2887 }
2888 if ((thisp & Modifiers.PROTECTED) != Modifiers.PROTECTED) {
2889 //
2890 // if it's not "protected internal", it must be "protected"
2891 //
2892
2893 return false;
2894 }
2895 if (this_member.Parent.PartialContainer.Module.Assembly == base_member.Assembly) {
2896 //
2897 // protected within the same assembly - an error
2898 //
2899 return false;
2900 }
2901 if ((thisp & ~(Modifiers.PROTECTED | Modifiers.INTERNAL)) !=
2902 (base_classp & ~(Modifiers.PROTECTED | Modifiers.INTERNAL))) {
2903 //
2904 // protected ok, but other attributes differ - report an error
2905 //
2906 return false;
2907 }
2908 return true;
2909 }
2910
2911 return thisp == base_classp;
2912 }
2913
2914 public override bool Define ()
2915 {
2916 if (IsInterface) {
2917 ModFlags = Modifiers.PUBLIC | Modifiers.ABSTRACT |
2918 Modifiers.VIRTUAL | (ModFlags & (Modifiers.UNSAFE | Modifiers.NEW));
2919
2920 flags = MethodAttributes.Public |
2921 MethodAttributes.Abstract |
2922 MethodAttributes.HideBySig |
2923 MethodAttributes.NewSlot |
2924 MethodAttributes.Virtual;
2925 } else {
2926 Parent.PartialContainer.MethodModifiersValid (this);
2927
2928 flags = ModifiersExtensions.MethodAttr (ModFlags);
2929 }
2930
2931 if (IsExplicitImpl) {
2932 TypeExpr iface_texpr = MemberName.Left.GetTypeExpression ().ResolveAsTypeTerminal (Parent, false);
2933 if (iface_texpr == null)
2934 return false;
2935
2936 if ((ModFlags & Modifiers.PARTIAL) != 0) {
2937 Report.Error (754, Location, "A partial method `{0}' cannot explicitly implement an interface",
2938 GetSignatureForError ());
2939 }
2940
2941 InterfaceType = iface_texpr.Type;
2942
2943 if (!InterfaceType.IsInterface) {
2944 Report.SymbolRelatedToPreviousError (InterfaceType);
2945 Report.Error (538, Location, "The type `{0}' in explicit interface declaration is not an interface",
2946 TypeManager.CSharpName (InterfaceType));
2947 } else {
2948 Parent.PartialContainer.VerifyImplements (this);
2949 }
2950
2951 ModifiersExtensions.Check (Modifiers.AllowedExplicitImplFlags, explicit_mod_flags, 0, Location, Report);
2952 }
2953
2954 return base.Define ();
2955 }
2956
2957 protected bool DefineParameters (ParametersCompiled parameters)
2958 {
2959 if (!parameters.Resolve (this))
2960 return false;
2961
2962 bool error = false;
2963 for (int i = 0; i < parameters.Count; ++i) {
2964 Parameter p = parameters [i];
2965
2966 if (p.HasDefaultValue && (IsExplicitImpl || this is Operator || (this is Indexer && parameters.Count == 1)))
2967 p.Warning_UselessOptionalParameter (Report);
2968
2969 if (p.CheckAccessibility (this))
2970 continue;
2971
2972 TypeSpec t = parameters.Types [i];
2973 Report.SymbolRelatedToPreviousError (t);
2974 if (this is Indexer)
2975 Report.Error (55, Location,
2976 "Inconsistent accessibility: parameter type `{0}' is less accessible than indexer `{1}'",
2977 TypeManager.CSharpName (t), GetSignatureForError ());
2978 else if (this is Operator)
2979 Report.Error (57, Location,
2980 "Inconsistent accessibility: parameter type `{0}' is less accessible than operator `{1}'",
2981 TypeManager.CSharpName (t), GetSignatureForError ());
2982 else
2983 Report.Error (51, Location,
2984 "Inconsistent accessibility: parameter type `{0}' is less accessible than method `{1}'",
2985 TypeManager.CSharpName (t), GetSignatureForError ());
2986 error = true;
2987 }
2988 return !error;
2989 }
2990
2991 public override void Emit()
2992 {
2993 // for extern static method must be specified either DllImport attribute or MethodImplAttribute.
2994 // We are more strict than csc and report this as an error because SRE does not allow emit that
2995 if ((ModFlags & Modifiers.EXTERN) != 0 && !is_external_implementation) {
2996 if (this is Constructor) {
2997 Report.Error (824, Location,
2998 "Constructor `{0}' is marked `external' but has no external implementation specified", GetSignatureForError ());
2999 } else {
3000 Report.Error (626, Location,
3001 "`{0}' is marked as an external but has no DllImport attribute. Consider adding a DllImport attribute to specify the external implementation",
3002 GetSignatureForError ());
3003 }
3004 }
3005
3006 base.Emit ();
3007 }
3008
3009 public override bool EnableOverloadChecks (MemberCore overload)
3010 {
3011 //
3012 // Two members can differ in their explicit interface
3013 // type parameter only
3014 //
3015 InterfaceMemberBase imb = overload as InterfaceMemberBase;
3016 if (imb != null && imb.IsExplicitImpl) {
3017 if (IsExplicitImpl) {
3018 caching_flags |= Flags.MethodOverloadsExist;
3019 }
3020 return true;
3021 }
3022
3023 return IsExplicitImpl;
3024 }
3025
3026 protected void Error_CannotChangeAccessModifiers (MemberCore member, MemberSpec base_member)
3027 {
3028 Report.SymbolRelatedToPreviousError (base_member);
3029 Report.Error (507, member.Location,
3030 "`{0}': cannot change access modifiers when overriding `{1}' inherited member `{2}'",
3031 member.GetSignatureForError (),
3032 ModifiersExtensions.AccessibilityName (base_member.Modifiers),
3033 base_member.GetSignatureForError ());
3034 }
3035
3036 protected void Error_StaticReturnType ()
3037 {
3038 Report.Error (722, Location,
3039 "`{0}': static types cannot be used as return types",
3040 MemberType.GetSignatureForError ());
3041 }
3042
3043 /// <summary>
3044 /// Gets base method and its return type
3045 /// </summary>
3046 protected virtual MemberSpec FindBaseMember (out MemberSpec bestCandidate)
3047 {
3048 return MemberCache.FindBaseMember (this, out bestCandidate);
3049 }
3050
3051 //
3052 // The "short" name of this property / indexer / event. This is the
3053 // name without the explicit interface.
3054 //
3055 public string ShortName {
3056 get { return MemberName.Name; }
3057 set { SetMemberName (new MemberName (MemberName.Left, value, Location)); }
3058 }
3059
3060 //
3061 // Returns full metadata method name
3062 //
3063 public string GetFullName (MemberName name)
3064 {
3065 return GetFullName (name.Name);
3066 }
3067
3068 public string GetFullName (string name)
3069 {
3070 if (!IsExplicitImpl)
3071 return name;
3072
3073 //
3074 // When dealing with explicit members a full interface type
3075 // name is added to member name to avoid possible name conflicts
3076 //
3077 // We use CSharpName which gets us full name with benefit of
3078 // replacing predefined names which saves some space and name
3079 // is still unique
3080 //
3081 return TypeManager.CSharpName (InterfaceType) + "." + name;
3082 }
3083
3084 protected override bool VerifyClsCompliance ()
3085 {
3086 if (!base.VerifyClsCompliance ()) {
3087 return false;
3088 }
3089
3090 if (GenericMethod != null)
3091 GenericMethod.VerifyClsCompliance ();
3092
3093 return true;
3094 }
3095
3096 public override bool IsUsed
3097 {
3098 get { return IsExplicitImpl || base.IsUsed; }
3099 }
3100
3101 }
3102
3103 public abstract class MemberBase : MemberCore
3104 {
3105 protected FullNamedExpression type_expr;
3106 protected TypeSpec member_type;
3107
3108 public readonly DeclSpace ds;
3109 public readonly GenericMethod GenericMethod;
3110
3111 protected MemberBase (DeclSpace parent, GenericMethod generic,
3112 FullNamedExpression type, Modifiers mod, Modifiers allowed_mod, Modifiers def_mod,
3113 MemberName name, Attributes attrs)
3114 : base (parent, name, attrs)
3115 {
3116 this.ds = generic != null ? generic : (DeclSpace) parent;
3117 this.type_expr = type;
3118 ModFlags = ModifiersExtensions.Check (allowed_mod, mod, def_mod, Location, Report);
3119 GenericMethod = generic;
3120 if (GenericMethod != null)
3121 GenericMethod.ModFlags = ModFlags;
3122 }
3123
3124 //
3125 // Main member define entry
3126 //
3127 public override bool Define ()
3128 {
3129 DoMemberTypeIndependentChecks ();
3130
3131 //
3132 // Returns false only when type resolution failed
3133 //
3134 if (!ResolveMemberType ())
3135 return false;
3136
3137 DoMemberTypeDependentChecks ();
3138 return true;
3139 }
3140
3141 //
3142 // Any type_name independent checks
3143 //
3144 protected virtual void DoMemberTypeIndependentChecks ()
3145 {
3146 if ((Parent.ModFlags & Modifiers.SEALED) != 0 &&
3147 (ModFlags & (Modifiers.VIRTUAL | Modifiers.ABSTRACT)) != 0) {
3148 Report.Error (549, Location, "New virtual member `{0}' is declared in a sealed class `{1}'",
3149 GetSignatureForError (), Parent.GetSignatureForError ());
3150 }
3151 }
3152
3153 //
3154 // Any type_name dependent checks
3155 //
3156 protected virtual void DoMemberTypeDependentChecks ()
3157 {
3158 // verify accessibility
3159 if (!IsAccessibleAs (MemberType)) {
3160 Report.SymbolRelatedToPreviousError (MemberType);
3161 if (this is Property)
3162 Report.Error (53, Location,
3163 "Inconsistent accessibility: property type `" +
3164 TypeManager.CSharpName (MemberType) + "' is less " +
3165 "accessible than property `" + GetSignatureForError () + "'");
3166 else if (this is Indexer)
3167 Report.Error (54, Location,
3168 "Inconsistent accessibility: indexer return type `" +
3169 TypeManager.CSharpName (MemberType) + "' is less " +
3170 "accessible than indexer `" + GetSignatureForError () + "'");
3171 else if (this is MethodCore) {
3172 if (this is Operator)
3173 Report.Error (56, Location,
3174 "Inconsistent accessibility: return type `" +
3175 TypeManager.CSharpName (MemberType) + "' is less " +
3176 "accessible than operator `" + GetSignatureForError () + "'");
3177 else
3178 Report.Error (50, Location,
3179 "Inconsistent accessibility: return type `" +
3180 TypeManager.CSharpName (MemberType) + "' is less " +
3181 "accessible than method `" + GetSignatureForError () + "'");
3182 } else {
3183 Report.Error (52, Location,
3184 "Inconsistent accessibility: field type `" +
3185 TypeManager.CSharpName (MemberType) + "' is less " +
3186 "accessible than field `" + GetSignatureForError () + "'");
3187 }
3188 }
3189
3190 Variance variance = this is Event ? Variance.Contravariant : Variance.Covariant;
3191 TypeManager.CheckTypeVariance (MemberType, variance, this);
3192 }
3193
3194 protected bool IsTypePermitted ()
3195 {
3196 if (TypeManager.IsSpecialType (MemberType)) {
3197 Report.Error (610, Location, "Field or property cannot be of type `{0}'", TypeManager.CSharpName (MemberType));
3198 return false;
3199 }
3200 return true;
3201 }
3202
3203 protected virtual bool CheckBase ()
3204 {
3205 CheckProtectedModifier ();
3206
3207 return true;
3208 }
3209
3210 public TypeSpec MemberType {
3211 get { return member_type; }
3212 }
3213
3214 protected virtual bool ResolveMemberType ()
3215 {
3216 if (member_type != null)
3217 throw new InternalErrorException ("Multi-resolve");
3218
3219 TypeExpr te = type_expr.ResolveAsTypeTerminal (this, false);
3220 if (te == null)
3221 return false;
3222
3223 //
3224 // Replace original type name, error reporting can use fully resolved name
3225 //
3226 type_expr = te;
3227
3228 member_type = te.Type;
3229 return true;
3230 }
3231 }
3232 }
3233
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