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2009-07-17 Zoltan Varga <vargaz@gmail.com>
[mcs.git] / mcs / decl.cs
blob6b341f0de709f57eaea7ab56f55ae425ca5b0d56
1 //
2 // decl.cs: Declaration base class for structs, classes, enums and interfaces.
3 //
4 // Author: Miguel de Icaza (miguel@gnu.org)
5 // Marek Safar (marek.safar@seznam.cz)
6 //
7 // Dual licensed under the terms of the MIT X11 or GNU GPL
8 //
9 // Copyright 2001 Ximian, Inc (http://www.ximian.com)
10 // Copyright 2004-2008 Novell, Inc
11 //
12 //
13
14 using System;
15 using System.Text;
16 using System.Collections;
17 using System.Globalization;
18 using System.Reflection.Emit;
19 using System.Reflection;
20
21 #if BOOTSTRAP_WITH_OLDLIB || NET_2_1
22 using XmlElement = System.Object;
23 #else
24 using System.Xml;
25 #endif
26
27 namespace Mono.CSharp {
28
29 //
30 // Better name would be DottenName
31 //
32 public class MemberName {
33 public readonly string Name;
34 public readonly TypeArguments TypeArguments;
35
36 public readonly MemberName Left;
37 public readonly Location Location;
38
39 public static readonly MemberName Null = new MemberName ("");
40
41 bool is_double_colon;
42
43 private MemberName (MemberName left, string name, bool is_double_colon,
44 Location loc)
45 {
46 this.Name = name;
47 this.Location = loc;
48 this.is_double_colon = is_double_colon;
49 this.Left = left;
50 }
51
52 private MemberName (MemberName left, string name, bool is_double_colon,
53 TypeArguments args, Location loc)
54 : this (left, name, is_double_colon, loc)
55 {
56 if (args != null && args.Count > 0)
57 this.TypeArguments = args;
58 }
59
60 public MemberName (string name)
61 : this (name, Location.Null)
62 { }
63
64 public MemberName (string name, Location loc)
65 : this (null, name, false, loc)
66 { }
67
68 public MemberName (string name, TypeArguments args, Location loc)
69 : this (null, name, false, args, loc)
70 { }
71
72 public MemberName (MemberName left, string name)
73 : this (left, name, left != null ? left.Location : Location.Null)
74 { }
75
76 public MemberName (MemberName left, string name, Location loc)
77 : this (left, name, false, loc)
78 { }
79
80 public MemberName (MemberName left, string name, TypeArguments args, Location loc)
81 : this (left, name, false, args, loc)
82 { }
83
84 public MemberName (string alias, string name, TypeArguments args, Location loc)
85 : this (new MemberName (alias, loc), name, true, args, loc)
86 { }
87
88 public MemberName (MemberName left, MemberName right)
89 : this (left, right, right.Location)
90 { }
91
92 public MemberName (MemberName left, MemberName right, Location loc)
93 : this (null, right.Name, false, right.TypeArguments, loc)
94 {
95 if (right.is_double_colon)
96 throw new InternalErrorException ("Cannot append double_colon member name");
97 this.Left = (right.Left == null) ? left : new MemberName (left, right.Left);
98 }
99
100 // TODO: Remove
101 public string GetName ()
102 {
103 return GetName (false);
104 }
105
106 public bool IsGeneric {
107 get {
108 if (TypeArguments != null)
109 return true;
110 else if (Left != null)
111 return Left.IsGeneric;
112 else
113 return false;
114 }
115 }
116
117 public string GetName (bool is_generic)
118 {
119 string name = is_generic ? Basename : Name;
120 if (Left != null)
121 return Left.GetName (is_generic) + (is_double_colon ? "::" : ".") + name;
122
123 return name;
124 }
125
126 public ATypeNameExpression GetTypeExpression ()
127 {
128 if (Left == null) {
129 if (TypeArguments != null)
130 return new SimpleName (Basename, TypeArguments, Location);
131
132 return new SimpleName (Name, Location);
133 }
134
135 if (is_double_colon) {
136 if (Left.Left != null)
137 throw new InternalErrorException ("The left side of a :: should be an identifier");
138 return new QualifiedAliasMember (Left.Name, Name, TypeArguments, Location);
139 }
140
141 Expression lexpr = Left.GetTypeExpression ();
142 return new MemberAccess (lexpr, Name, TypeArguments, Location);
143 }
144
145 public MemberName Clone ()
146 {
147 MemberName left_clone = Left == null ? null : Left.Clone ();
148 return new MemberName (left_clone, Name, is_double_colon, TypeArguments, Location);
149 }
150
151 public string Basename {
152 get {
153 if (TypeArguments != null)
154 return MakeName (Name, TypeArguments);
155 return Name;
156 }
157 }
158
159 public string GetSignatureForError ()
160 {
161 string append = TypeArguments == null ? "" : "<" + TypeArguments.GetSignatureForError () + ">";
162 if (Left == null)
163 return Name + append;
164 string connect = is_double_colon ? "::" : ".";
165 return Left.GetSignatureForError () + connect + Name + append;
166 }
167
168 public override bool Equals (object other)
169 {
170 return Equals (other as MemberName);
171 }
172
173 public bool Equals (MemberName other)
174 {
175 if (this == other)
176 return true;
177 if (other == null || Name != other.Name)
178 return false;
179 if (is_double_colon != other.is_double_colon)
180 return false;
181
182 if ((TypeArguments != null) &&
183 (other.TypeArguments == null || TypeArguments.Count != other.TypeArguments.Count))
184 return false;
185
186 if ((TypeArguments == null) && (other.TypeArguments != null))
187 return false;
188
189 if (Left == null)
190 return other.Left == null;
191
192 return Left.Equals (other.Left);
193 }
194
195 public override int GetHashCode ()
196 {
197 int hash = Name.GetHashCode ();
198 for (MemberName n = Left; n != null; n = n.Left)
199 hash ^= n.Name.GetHashCode ();
200 if (is_double_colon)
201 hash ^= 0xbadc01d;
202
203 if (TypeArguments != null)
204 hash ^= TypeArguments.Count << 5;
205
206 return hash & 0x7FFFFFFF;
207 }
208
209 public int CountTypeArguments {
210 get {
211 if (TypeArguments != null)
212 return TypeArguments.Count;
213 else if (Left != null)
214 return Left.CountTypeArguments;
215 else
216 return 0;
217 }
218 }
219
220 public static string MakeName (string name, TypeArguments args)
221 {
222 if (args == null)
223 return name;
224
225 return name + "`" + args.Count;
226 }
227
228 public static string MakeName (string name, int count)
229 {
230 return name + "`" + count;
231 }
232 }
233
234 /// <summary>
235 /// Base representation for members. This is used to keep track
236 /// of Name, Location and Modifier flags, and handling Attributes.
237 /// </summary>
238 public abstract class MemberCore : Attributable, IResolveContext {
239 /// <summary>
240 /// Public name
241 /// </summary>
242
243 protected string cached_name;
244 // TODO: Remove in favor of MemberName
245 public string Name {
246 get {
247 if (cached_name == null)
248 cached_name = MemberName.GetName (!(this is GenericMethod) && !(this is Method));
249 return cached_name;
250 }
251 }
252
253 // Is not readonly because of IndexerName attribute
254 private MemberName member_name;
255 public MemberName MemberName {
256 get { return member_name; }
257 }
258
259 /// <summary>
260 /// Modifier flags that the user specified in the source code
261 /// </summary>
262 private int mod_flags;
263 public int ModFlags {
264 set {
265 mod_flags = value;
266 if ((value & Modifiers.COMPILER_GENERATED) != 0)
267 caching_flags = Flags.IsUsed | Flags.IsAssigned;
268 }
269 get {
270 return mod_flags;
271 }
272 }
273
274 public /*readonly*/ DeclSpace Parent;
275
276 /// <summary>
277 /// Location where this declaration happens
278 /// </summary>
279 public Location Location {
280 get { return member_name.Location; }
281 }
282
283 /// <summary>
284 /// XML documentation comment
285 /// </summary>
286 protected string comment;
287
288 /// <summary>
289 /// Represents header string for documentation comment
290 /// for each member types.
291 /// </summary>
292 public abstract string DocCommentHeader { get; }
293
294 [Flags]
295 public enum Flags {
296 Obsolete_Undetected = 1, // Obsolete attribute has not been detected yet
297 Obsolete = 1 << 1, // Type has obsolete attribute
298 ClsCompliance_Undetected = 1 << 2, // CLS Compliance has not been detected yet
299 ClsCompliant = 1 << 3, // Type is CLS Compliant
300 CloseTypeCreated = 1 << 4, // Tracks whether we have Closed the type
301 HasCompliantAttribute_Undetected = 1 << 5, // Presence of CLSCompliantAttribute has not been detected
302 HasClsCompliantAttribute = 1 << 6, // Type has CLSCompliantAttribute
303 ClsCompliantAttributeTrue = 1 << 7, // Type has CLSCompliant (true)
304 Excluded_Undetected = 1 << 8, // Conditional attribute has not been detected yet
305 Excluded = 1 << 9, // Method is conditional
306 MethodOverloadsExist = 1 << 10, // Test for duplication must be performed
307 IsUsed = 1 << 11,
308 IsAssigned = 1 << 12, // Field is assigned
309 HasExplicitLayout = 1 << 13,
310 PartialDefinitionExists = 1 << 14, // Set when corresponding partial method definition exists
311 HasStructLayout = 1 << 15 // Has StructLayoutAttribute
312 }
313
314 /// <summary>
315 /// MemberCore flags at first detected then cached
316 /// </summary>
317 internal Flags caching_flags;
318
319 public MemberCore (DeclSpace parent, MemberName name, Attributes attrs)
320 : base (attrs)
321 {
322 this.Parent = parent;
323 member_name = name;
324 caching_flags = Flags.Obsolete_Undetected | Flags.ClsCompliance_Undetected | Flags.HasCompliantAttribute_Undetected | Flags.Excluded_Undetected;
325 }
326
327 protected virtual void SetMemberName (MemberName new_name)
328 {
329 member_name = new_name;
330 cached_name = null;
331 }
332
333 protected bool CheckAbstractAndExtern (bool has_block)
334 {
335 if (Parent.PartialContainer.Kind == Kind.Interface)
336 return true;
337
338 if (has_block) {
339 if ((ModFlags & Modifiers.EXTERN) != 0) {
340 Report.Error (179, Location, "`{0}' cannot declare a body because it is marked extern",
341 GetSignatureForError ());
342 return false;
343 }
344
345 if ((ModFlags & Modifiers.ABSTRACT) != 0) {
346 Report.Error (500, Location, "`{0}' cannot declare a body because it is marked abstract",
347 GetSignatureForError ());
348 return false;
349 }
350 } else {
351 if ((ModFlags & (Modifiers.ABSTRACT | Modifiers.EXTERN | Modifiers.PARTIAL)) == 0) {
352 if (RootContext.Version >= LanguageVersion.V_3) {
353 Property.PropertyMethod pm = this as Property.PropertyMethod;
354 if (pm is Indexer.GetIndexerMethod || pm is Indexer.SetIndexerMethod)
355 pm = null;
356
357 if (pm != null && (pm.Property.Get.IsDummy || pm.Property.Set.IsDummy)) {
358 Report.Error (840, Location,
359 "`{0}' must have a body because it is not marked abstract or extern. The property can be automatically implemented when you define both accessors",
360 GetSignatureForError ());
361 return false;
362 }
363 }
364
365 Report.Error (501, Location, "`{0}' must have a body because it is not marked abstract, extern, or partial",
366 GetSignatureForError ());
367 return false;
368 }
369 }
370
371 return true;
372 }
373
374 public void CheckProtectedModifier ()
375 {
376 if ((ModFlags & Modifiers.PROTECTED) == 0)
377 return;
378
379 if (Parent.PartialContainer.Kind == Kind.Struct) {
380 Report.Error (666, Location, "`{0}': Structs cannot contain protected members",
381 GetSignatureForError ());
382 return;
383 }
384
385 if ((Parent.ModFlags & Modifiers.STATIC) != 0) {
386 Report.Error (1057, Location, "`{0}': Static classes cannot contain protected members",
387 GetSignatureForError ());
388 return;
389 }
390
391 if ((Parent.ModFlags & Modifiers.SEALED) != 0 && (ModFlags & Modifiers.OVERRIDE) == 0 &&
392 !(this is Destructor)) {
393 Report.Warning (628, 4, Location, "`{0}': new protected member declared in sealed class",
394 GetSignatureForError ());
395 return;
396 }
397 }
398
399 public abstract bool Define ();
400
401 public virtual string DocComment {
402 get {
403 return comment;
404 }
405 set {
406 comment = value;
407 }
408 }
409
410 //
411 // Returns full member name for error message
412 //
413 public virtual string GetSignatureForError ()
414 {
415 if (Parent == null || Parent.Parent == null)
416 return member_name.GetSignatureForError ();
417
418 return Parent.GetSignatureForError () + "." + member_name.GetSignatureForError ();
419 }
420
421 /// <summary>
422 /// Base Emit method. This is also entry point for CLS-Compliant verification.
423 /// </summary>
424 public virtual void Emit ()
425 {
426 if (!RootContext.VerifyClsCompliance)
427 return;
428
429 if (Report.WarningLevel > 0)
430 VerifyClsCompliance ();
431 }
432
433 public bool IsCompilerGenerated {
434 get {
435 if ((mod_flags & Modifiers.COMPILER_GENERATED) != 0)
436 return true;
437
438 return Parent == null ? false : Parent.IsCompilerGenerated;
439 }
440 }
441
442 public virtual bool IsUsed {
443 get { return (caching_flags & Flags.IsUsed) != 0; }
444 }
445
446 public void SetMemberIsUsed ()
447 {
448 caching_flags |= Flags.IsUsed;
449 }
450
451 /// <summary>
452 /// Returns instance of ObsoleteAttribute for this MemberCore
453 /// </summary>
454 public virtual ObsoleteAttribute GetObsoleteAttribute ()
455 {
456 if ((caching_flags & (Flags.Obsolete_Undetected | Flags.Obsolete)) == 0)
457 return null;
458
459 caching_flags &= ~Flags.Obsolete_Undetected;
460
461 if (OptAttributes == null)
462 return null;
463
464 Attribute obsolete_attr = OptAttributes.Search (PredefinedAttributes.Get.Obsolete);
465 if (obsolete_attr == null)
466 return null;
467
468 caching_flags |= Flags.Obsolete;
469
470 ObsoleteAttribute obsolete = obsolete_attr.GetObsoleteAttribute ();
471 if (obsolete == null)
472 return null;
473
474 return obsolete;
475 }
476
477 /// <summary>
478 /// Checks for ObsoleteAttribute presence. It's used for testing of all non-types elements
479 /// </summary>
480 public virtual void CheckObsoleteness (Location loc)
481 {
482 ObsoleteAttribute oa = GetObsoleteAttribute ();
483 if (oa != null)
484 AttributeTester.Report_ObsoleteMessage (oa, GetSignatureForError (), loc);
485 }
486
487 // Access level of a type.
488 const int X = 1;
489 enum AccessLevel
490 { // Each column represents `is this scope larger or equal to Blah scope'
491 // Public Assembly Protected
492 Protected = (0 << 0) | (0 << 1) | (X << 2),
493 Public = (X << 0) | (X << 1) | (X << 2),
494 Private = (0 << 0) | (0 << 1) | (0 << 2),
495 Internal = (0 << 0) | (X << 1) | (0 << 2),
496 ProtectedOrInternal = (0 << 0) | (X << 1) | (X << 2),
497 }
498
499 static AccessLevel GetAccessLevelFromModifiers (int flags)
500 {
501 if ((flags & Modifiers.INTERNAL) != 0) {
502
503 if ((flags & Modifiers.PROTECTED) != 0)
504 return AccessLevel.ProtectedOrInternal;
505 else
506 return AccessLevel.Internal;
507
508 } else if ((flags & Modifiers.PROTECTED) != 0)
509 return AccessLevel.Protected;
510 else if ((flags & Modifiers.PRIVATE) != 0)
511 return AccessLevel.Private;
512 else
513 return AccessLevel.Public;
514 }
515
516 //
517 // Returns the access level for type `t'
518 //
519 static AccessLevel GetAccessLevelFromType (Type t)
520 {
521 if (t.IsPublic)
522 return AccessLevel.Public;
523 if (t.IsNestedPrivate)
524 return AccessLevel.Private;
525 if (t.IsNotPublic)
526 return AccessLevel.Internal;
527
528 if (t.IsNestedPublic)
529 return AccessLevel.Public;
530 if (t.IsNestedAssembly)
531 return AccessLevel.Internal;
532 if (t.IsNestedFamily)
533 return AccessLevel.Protected;
534 if (t.IsNestedFamORAssem)
535 return AccessLevel.ProtectedOrInternal;
536 if (t.IsNestedFamANDAssem)
537 throw new NotImplementedException ("NestedFamANDAssem not implemented, cant make this kind of type from c# anyways");
538
539 // nested private is taken care of
540
541 throw new Exception ("I give up, what are you?");
542 }
543
544 //
545 // Checks whether the type P is as accessible as this member
546 //
547 public bool IsAccessibleAs (Type p)
548 {
549 //
550 // if M is private, its accessibility is the same as this declspace.
551 // we already know that P is accessible to T before this method, so we
552 // may return true.
553 //
554 if ((mod_flags & Modifiers.PRIVATE) != 0)
555 return true;
556
557 while (TypeManager.HasElementType (p))
558 p = TypeManager.GetElementType (p);
559
560 if (TypeManager.IsGenericParameter (p))
561 return true;
562
563 if (TypeManager.IsGenericType (p)) {
564 foreach (Type t in TypeManager.GetTypeArguments (p)) {
565 if (!IsAccessibleAs (t))
566 return false;
567 }
568 }
569
570 for (Type p_parent = null; p != null; p = p_parent) {
571 p_parent = p.DeclaringType;
572 AccessLevel pAccess = GetAccessLevelFromType (p);
573 if (pAccess == AccessLevel.Public)
574 continue;
575
576 bool same_access_restrictions = false;
577 for (MemberCore mc = this; !same_access_restrictions && mc != null && mc.Parent != null; mc = mc.Parent) {
578 AccessLevel al = GetAccessLevelFromModifiers (mc.ModFlags);
579 switch (pAccess) {
580 case AccessLevel.Internal:
581 if (al == AccessLevel.Private || al == AccessLevel.Internal)
582 same_access_restrictions = TypeManager.IsThisOrFriendAssembly (p.Assembly);
583
584 break;
585
586 case AccessLevel.Protected:
587 if (al == AccessLevel.Protected) {
588 same_access_restrictions = mc.Parent.IsBaseType (p_parent);
589 break;
590 }
591
592 if (al == AccessLevel.Private) {
593 //
594 // When type is private and any of its parents derives from
595 // protected type then the type is accessible
596 //
597 while (mc.Parent != null) {
598 if (mc.Parent.IsBaseType (p_parent))
599 same_access_restrictions = true;
600 mc = mc.Parent;
601 }
602 }
603
604 break;
605
606 case AccessLevel.ProtectedOrInternal:
607 if (al == AccessLevel.Protected)
608 same_access_restrictions = mc.Parent.IsBaseType (p_parent);
609 else if (al == AccessLevel.Internal)
610 same_access_restrictions = TypeManager.IsThisOrFriendAssembly (p.Assembly);
611 else if (al == AccessLevel.ProtectedOrInternal)
612 same_access_restrictions = mc.Parent.IsBaseType (p_parent) &&
613 TypeManager.IsThisOrFriendAssembly (p.Assembly);
614
615 break;
616
617 case AccessLevel.Private:
618 //
619 // Both are private and share same parent
620 //
621 if (al == AccessLevel.Private)
622 same_access_restrictions = TypeManager.IsEqual (mc.Parent.TypeBuilder, p_parent);
623
624 break;
625
626 default:
627 throw new InternalErrorException (al.ToString ());
628 }
629 }
630
631 if (!same_access_restrictions)
632 return false;
633 }
634
635 return true;
636 }
637
638 /// <summary>
639 /// Analyze whether CLS-Compliant verification must be execute for this MemberCore.
640 /// </summary>
641 public override bool IsClsComplianceRequired ()
642 {
643 if ((caching_flags & Flags.ClsCompliance_Undetected) == 0)
644 return (caching_flags & Flags.ClsCompliant) != 0;
645
646 if (GetClsCompliantAttributeValue () && IsExposedFromAssembly ()) {
647 caching_flags &= ~Flags.ClsCompliance_Undetected;
648 caching_flags |= Flags.ClsCompliant;
649 return true;
650 }
651
652 caching_flags &= ~Flags.ClsCompliance_Undetected;
653 return false;
654 }
655
656 /// <summary>
657 /// Returns true when MemberCore is exposed from assembly.
658 /// </summary>
659 public bool IsExposedFromAssembly ()
660 {
661 if ((ModFlags & (Modifiers.PUBLIC | Modifiers.PROTECTED)) == 0)
662 return false;
663
664 DeclSpace parentContainer = Parent;
665 while (parentContainer != null && parentContainer.ModFlags != 0) {
666 if ((parentContainer.ModFlags & (Modifiers.PUBLIC | Modifiers.PROTECTED)) == 0)
667 return false;
668 parentContainer = parentContainer.Parent;
669 }
670 return true;
671 }
672
673 /// <summary>
674 /// Goes through class hierarchy and gets value of first found CLSCompliantAttribute.
675 /// If no is attribute exists then assembly CLSCompliantAttribute is returned.
676 /// </summary>
677 public virtual bool GetClsCompliantAttributeValue ()
678 {
679 if ((caching_flags & Flags.HasCompliantAttribute_Undetected) == 0)
680 return (caching_flags & Flags.ClsCompliantAttributeTrue) != 0;
681
682 caching_flags &= ~Flags.HasCompliantAttribute_Undetected;
683
684 if (OptAttributes != null) {
685 Attribute cls_attribute = OptAttributes.Search (
686 PredefinedAttributes.Get.CLSCompliant);
687 if (cls_attribute != null) {
688 caching_flags |= Flags.HasClsCompliantAttribute;
689 bool value = cls_attribute.GetClsCompliantAttributeValue ();
690 if (value)
691 caching_flags |= Flags.ClsCompliantAttributeTrue;
692 return value;
693 }
694 }
695
696 // It's null for TypeParameter
697 if (Parent == null)
698 return false;
699
700 if (Parent.GetClsCompliantAttributeValue ()) {
701 caching_flags |= Flags.ClsCompliantAttributeTrue;
702 return true;
703 }
704 return false;
705 }
706
707 /// <summary>
708 /// Returns true if MemberCore is explicitly marked with CLSCompliantAttribute
709 /// </summary>
710 protected bool HasClsCompliantAttribute {
711 get {
712 if ((caching_flags & Flags.HasCompliantAttribute_Undetected) != 0)
713 GetClsCompliantAttributeValue ();
714
715 return (caching_flags & Flags.HasClsCompliantAttribute) != 0;
716 }
717 }
718
719 /// <summary>
720 /// Returns true when a member supports multiple overloads (methods, indexers, etc)
721 /// </summary>
722 public virtual bool EnableOverloadChecks (MemberCore overload)
723 {
724 return false;
725 }
726
727 /// <summary>
728 /// The main virtual method for CLS-Compliant verifications.
729 /// The method returns true if member is CLS-Compliant and false if member is not
730 /// CLS-Compliant which means that CLS-Compliant tests are not necessary. A descendants override it
731 /// and add their extra verifications.
732 /// </summary>
733 protected virtual bool VerifyClsCompliance ()
734 {
735 if (!IsClsComplianceRequired ()) {
736 if (HasClsCompliantAttribute && Report.WarningLevel >= 2) {
737 if (!IsExposedFromAssembly ()) {
738 Attribute a = OptAttributes.Search (PredefinedAttributes.Get.CLSCompliant);
739 Report.Warning (3019, 2, a.Location, "CLS compliance checking will not be performed on `{0}' because it is not visible from outside this assembly", GetSignatureForError ());
740 }
741
742 if (!CodeGen.Assembly.IsClsCompliant) {
743 Attribute a = OptAttributes.Search (PredefinedAttributes.Get.CLSCompliant);
744 Report.Warning (3021, 2, a.Location, "`{0}' does not need a CLSCompliant attribute because the assembly is not marked as CLS-compliant", GetSignatureForError ());
745 }
746 }
747 return false;
748 }
749
750 if (HasClsCompliantAttribute) {
751 if (CodeGen.Assembly.ClsCompliantAttribute == null && !CodeGen.Assembly.IsClsCompliant) {
752 Attribute a = OptAttributes.Search (PredefinedAttributes.Get.CLSCompliant);
753 Report.Warning (3014, 1, a.Location,
754 "`{0}' cannot be marked as CLS-compliant because the assembly is not marked as CLS-compliant",
755 GetSignatureForError ());
756 return false;
757 }
758
759 if (!Parent.IsClsComplianceRequired ()) {
760 Attribute a = OptAttributes.Search (PredefinedAttributes.Get.CLSCompliant);
761 Report.Warning (3018, 1, a.Location, "`{0}' cannot be marked as CLS-compliant because it is a member of non CLS-compliant type `{1}'",
762 GetSignatureForError (), Parent.GetSignatureForError ());
763 return false;
764 }
765 }
766
767 if (member_name.Name [0] == '_') {
768 Report.Warning (3008, 1, Location, "Identifier `{0}' is not CLS-compliant", GetSignatureForError () );
769 }
770 return true;
771 }
772
773 //
774 // Raised (and passed an XmlElement that contains the comment)
775 // when GenerateDocComment is writing documentation expectedly.
776 //
777 internal virtual void OnGenerateDocComment (XmlElement intermediateNode)
778 {
779 }
780
781 //
782 // Returns a string that represents the signature for this
783 // member which should be used in XML documentation.
784 //
785 public virtual string GetDocCommentName (DeclSpace ds)
786 {
787 if (ds == null || this is DeclSpace)
788 return DocCommentHeader + Name;
789 else
790 return String.Concat (DocCommentHeader, ds.Name, ".", Name);
791 }
792
793 //
794 // Generates xml doc comments (if any), and if required,
795 // handle warning report.
796 //
797 internal virtual void GenerateDocComment (DeclSpace ds)
798 {
799 try {
800 DocUtil.GenerateDocComment (this, ds);
801 } catch (Exception e) {
802 throw new InternalErrorException (this, e);
803 }
804 }
805
806 public override IResolveContext ResolveContext {
807 get { return this; }
808 }
809
810 #region IResolveContext Members
811
812 public DeclSpace DeclContainer {
813 get { return Parent; }
814 }
815
816 public virtual DeclSpace GenericDeclContainer {
817 get { return DeclContainer; }
818 }
819
820 public bool IsInObsoleteScope {
821 get {
822 if (GetObsoleteAttribute () != null)
823 return true;
824
825 return Parent == null ? false : Parent.IsInObsoleteScope;
826 }
827 }
828
829 public bool IsInUnsafeScope {
830 get {
831 if ((ModFlags & Modifiers.UNSAFE) != 0)
832 return true;
833
834 return Parent == null ? false : Parent.IsInUnsafeScope;
835 }
836 }
837
838 #endregion
839 }
840
841 /// <summary>
842 /// Base class for structs, classes, enumerations and interfaces.
843 /// </summary>
844 /// <remarks>
845 /// They all create new declaration spaces. This
846 /// provides the common foundation for managing those name
847 /// spaces.
848 /// </remarks>
849 public abstract class DeclSpace : MemberCore {
850 /// <summary>
851 /// This points to the actual definition that is being
852 /// created with System.Reflection.Emit
853 /// </summary>
854 public TypeBuilder TypeBuilder;
855
856 /// <summary>
857 /// If we are a generic type, this is the type we are
858 /// currently defining. We need to lookup members on this
859 /// instead of the TypeBuilder.
860 /// </summary>
861 public Type CurrentType;
862
863 //
864 // This is the namespace in which this typecontainer
865 // was declared. We use this to resolve names.
866 //
867 public NamespaceEntry NamespaceEntry;
868
869 private Hashtable Cache = new Hashtable ();
870
871 public readonly string Basename;
872
873 protected Hashtable defined_names;
874
875 public TypeContainer PartialContainer;
876
877 protected readonly bool is_generic;
878 readonly int count_type_params;
879 protected TypeParameter[] type_params;
880 TypeParameter[] type_param_list;
881
882 //
883 // Whether we are Generic
884 //
885 public bool IsGeneric {
886 get {
887 if (is_generic)
888 return true;
889 else if (Parent != null)
890 return Parent.IsGeneric;
891 else
892 return false;
893 }
894 }
895
896 static string[] attribute_targets = new string [] { "type" };
897
898 public DeclSpace (NamespaceEntry ns, DeclSpace parent, MemberName name,
899 Attributes attrs)
900 : base (parent, name, attrs)
901 {
902 NamespaceEntry = ns;
903 Basename = name.Basename;
904 defined_names = new Hashtable ();
905 PartialContainer = null;
906 if (name.TypeArguments != null) {
907 is_generic = true;
908 count_type_params = name.TypeArguments.Count;
909 }
910 if (parent != null)
911 count_type_params += parent.count_type_params;
912 }
913
914 public override DeclSpace GenericDeclContainer {
915 get { return this; }
916 }
917
918 /// <summary>
919 /// Adds the member to defined_names table. It tests for duplications and enclosing name conflicts
920 /// </summary>
921 protected virtual bool AddToContainer (MemberCore symbol, string name)
922 {
923 MemberCore mc = (MemberCore) defined_names [name];
924
925 if (mc == null) {
926 defined_names.Add (name, symbol);
927 return true;
928 }
929
930 if (((mc.ModFlags | symbol.ModFlags) & Modifiers.COMPILER_GENERATED) != 0)
931 return true;
932
933 if (symbol.EnableOverloadChecks (mc))
934 return true;
935
936 Report.SymbolRelatedToPreviousError (mc);
937 if ((mc.ModFlags & Modifiers.PARTIAL) != 0 && (symbol is ClassOrStruct || symbol is Interface)) {
938 Error_MissingPartialModifier (symbol);
939 return false;
940 }
941
942 if (this is ModuleContainer) {
943 Report.Error (101, symbol.Location,
944 "The namespace `{0}' already contains a definition for `{1}'",
945 ((DeclSpace)symbol).NamespaceEntry.GetSignatureForError (), symbol.MemberName.Name);
946 } else if (symbol is TypeParameter) {
947 Report.Error (692, symbol.Location,
948 "Duplicate type parameter `{0}'", symbol.GetSignatureForError ());
949 } else {
950 Report.Error (102, symbol.Location,
951 "The type `{0}' already contains a definition for `{1}'",
952 GetSignatureForError (), symbol.MemberName.Name);
953 }
954
955 return false;
956 }
957
958 protected void RemoveFromContainer (string name)
959 {
960 defined_names.Remove (name);
961 }
962
963 /// <summary>
964 /// Returns the MemberCore associated with a given name in the declaration
965 /// space. It doesn't return method based symbols !!
966 /// </summary>
967 ///
968 public MemberCore GetDefinition (string name)
969 {
970 return (MemberCore)defined_names [name];
971 }
972
973 public bool IsStaticClass {
974 get { return (ModFlags & Modifiers.STATIC) != 0; }
975 }
976
977 //
978 // root_types contains all the types. All TopLevel types
979 // hence have a parent that points to `root_types', that is
980 // why there is a non-obvious test down here.
981 //
982 public bool IsTopLevel {
983 get { return (Parent != null && Parent.Parent == null); }
984 }
985
986 public virtual bool IsUnmanagedType ()
987 {
988 return false;
989 }
990
991 public virtual void CloseType ()
992 {
993 if ((caching_flags & Flags.CloseTypeCreated) == 0){
994 try {
995 TypeBuilder.CreateType ();
996 } catch {
997 //
998 // The try/catch is needed because
999 // nested enumerations fail to load when they
1000 // are defined.
1001 //
1002 // Even if this is the right order (enumerations
1003 // declared after types).
1004 //
1005 // Note that this still creates the type and
1006 // it is possible to save it
1007 }
1008 caching_flags |= Flags.CloseTypeCreated;
1009 }
1010 }
1011
1012 protected virtual TypeAttributes TypeAttr {
1013 get { return Module.DefaultCharSetType; }
1014 }
1015
1016 /// <remarks>
1017 /// Should be overriten by the appropriate declaration space
1018 /// </remarks>
1019 public abstract TypeBuilder DefineType ();
1020
1021 protected void Error_MissingPartialModifier (MemberCore type)
1022 {
1023 Report.Error (260, type.Location,
1024 "Missing partial modifier on declaration of type `{0}'. Another partial declaration of this type exists",
1025 type.GetSignatureForError ());
1026 }
1027
1028 public override void Emit ()
1029 {
1030 if (type_params != null) {
1031 int offset = count_type_params - type_params.Length;
1032 for (int i = offset; i < type_params.Length; i++)
1033 CurrentTypeParameters [i - offset].Emit ();
1034 }
1035
1036 if ((ModFlags & Modifiers.COMPILER_GENERATED) != 0 && !Parent.IsCompilerGenerated)
1037 PredefinedAttributes.Get.CompilerGenerated.EmitAttribute (TypeBuilder);
1038
1039 base.Emit ();
1040 }
1041
1042 public override string GetSignatureForError ()
1043 {
1044 return MemberName.GetSignatureForError ();
1045 }
1046
1047 public bool CheckAccessLevel (Type check_type)
1048 {
1049 Type tb = TypeBuilder;
1050
1051 if (this is GenericMethod) {
1052 tb = Parent.TypeBuilder;
1053
1054 // FIXME: Generic container does not work with nested generic
1055 // anonymous method stories
1056 if (TypeBuilder == null)
1057 return true;
1058 }
1059
1060 check_type = TypeManager.DropGenericTypeArguments (check_type);
1061 if (check_type == tb)
1062 return true;
1063
1064 // TODO: When called from LocalUsingAliasEntry tb is null
1065 // because we are in RootDeclSpace
1066 if (tb == null)
1067 tb = typeof (RootDeclSpace);
1068
1069 //
1070 // Broken Microsoft runtime, return public for arrays, no matter what
1071 // the accessibility is for their underlying class, and they return
1072 // NonPublic visibility for pointers
1073 //
1074 if (TypeManager.HasElementType (check_type))
1075 return CheckAccessLevel (TypeManager.GetElementType (check_type));
1076
1077 TypeAttributes check_attr = check_type.Attributes & TypeAttributes.VisibilityMask;
1078
1079 switch (check_attr){
1080 case TypeAttributes.Public:
1081 return true;
1082
1083 case TypeAttributes.NotPublic:
1084 return TypeManager.IsThisOrFriendAssembly (check_type.Assembly);
1085
1086 case TypeAttributes.NestedPublic:
1087 return CheckAccessLevel (check_type.DeclaringType);
1088
1089 case TypeAttributes.NestedPrivate:
1090 Type declaring = check_type.DeclaringType;
1091 return tb == declaring || TypeManager.IsNestedChildOf (tb, declaring);
1092
1093 case TypeAttributes.NestedFamily:
1094 //
1095 // Only accessible to methods in current type or any subtypes
1096 //
1097 return FamilyAccessible (tb, check_type);
1098
1099 case TypeAttributes.NestedFamANDAssem:
1100 return TypeManager.IsThisOrFriendAssembly (check_type.Assembly) &&
1101 FamilyAccessible (tb, check_type);
1102
1103 case TypeAttributes.NestedFamORAssem:
1104 return FamilyAccessible (tb, check_type) ||
1105 TypeManager.IsThisOrFriendAssembly (check_type.Assembly);
1106
1107 case TypeAttributes.NestedAssembly:
1108 return TypeManager.IsThisOrFriendAssembly (check_type.Assembly);
1109 }
1110
1111 throw new NotImplementedException (check_attr.ToString ());
1112 }
1113
1114 static bool FamilyAccessible (Type tb, Type check_type)
1115 {
1116 Type declaring = check_type.DeclaringType;
1117 return TypeManager.IsNestedFamilyAccessible (tb, declaring);
1118 }
1119
1120 public bool IsBaseType (Type baseType)
1121 {
1122 if (TypeManager.IsInterfaceType (baseType))
1123 throw new NotImplementedException ();
1124
1125 Type type = TypeBuilder;
1126 while (type != null) {
1127 if (TypeManager.IsEqual (type, baseType))
1128 return true;
1129
1130 type = type.BaseType;
1131 }
1132
1133 return false;
1134 }
1135
1136 private Type LookupNestedTypeInHierarchy (string name)
1137 {
1138 Type t = null;
1139 // if the member cache has been created, lets use it.
1140 // the member cache is MUCH faster.
1141 if (MemberCache != null) {
1142 t = MemberCache.FindNestedType (name);
1143 if (t == null)
1144 return null;
1145
1146 //
1147 // FIXME: This hack is needed because member cache does not work
1148 // with nested base generic types, it does only type name copy and
1149 // not type construction
1150 //
1151 #if !GMCS_SOURCE
1152 return t;
1153 #endif
1154 }
1155
1156 // no member cache. Do it the hard way -- reflection
1157 for (Type current_type = TypeBuilder;
1158 current_type != null && current_type != TypeManager.object_type;
1159 current_type = current_type.BaseType) {
1160
1161 Type ct = TypeManager.DropGenericTypeArguments (current_type);
1162 if (ct is TypeBuilder) {
1163 TypeContainer tc = ct == TypeBuilder
1164 ? PartialContainer : TypeManager.LookupTypeContainer (ct);
1165 if (tc != null)
1166 t = tc.FindNestedType (name);
1167 } else {
1168 t = TypeManager.GetNestedType (ct, name);
1169 }
1170
1171 if ((t == null) || !CheckAccessLevel (t))
1172 continue;
1173
1174 if (!TypeManager.IsGenericType (current_type))
1175 return t;
1176
1177 Type[] args = TypeManager.GetTypeArguments (current_type);
1178 Type[] targs = TypeManager.GetTypeArguments (t);
1179 for (int i = 0; i < args.Length; i++)
1180 targs [i] = args [i];
1181
1182 #if GMCS_SOURCE
1183 t = t.MakeGenericType (targs);
1184 #endif
1185
1186 return t;
1187 }
1188
1189 return null;
1190 }
1191
1192 public virtual ExtensionMethodGroupExpr LookupExtensionMethod (Type extensionType, string name, Location loc)
1193 {
1194 return null;
1195 }
1196
1197 //
1198 // Public function used to locate types.
1199 //
1200 // Set 'ignore_cs0104' to true if you want to ignore cs0104 errors.
1201 //
1202 // Returns: Type or null if they type can not be found.
1203 //
1204 public FullNamedExpression LookupNamespaceOrType (string name, Location loc, bool ignore_cs0104)
1205 {
1206 if (Cache.Contains (name))
1207 return (FullNamedExpression) Cache [name];
1208
1209 FullNamedExpression e;
1210 int errors = Report.Errors;
1211 Type t = LookupNestedTypeInHierarchy (name);
1212 if (t != null)
1213 e = new TypeExpression (t, Location.Null);
1214 else if (Parent != null)
1215 e = Parent.LookupNamespaceOrType (name, loc, ignore_cs0104);
1216 else
1217 e = NamespaceEntry.LookupNamespaceOrType (this, name, loc, ignore_cs0104);
1218
1219 if (errors == Report.Errors)
1220 Cache [name] = e;
1221
1222 return e;
1223 }
1224
1225 /// <remarks>
1226 /// This function is broken and not what you're looking for. It should only
1227 /// be used while the type is still being created since it doesn't use the cache
1228 /// and relies on the filter doing the member name check.
1229 /// </remarks>
1230 ///
1231 // [Obsolete ("Only MemberCache approach should be used")]
1232 public virtual MemberList FindMembers (MemberTypes mt, BindingFlags bf,
1233 MemberFilter filter, object criteria)
1234 {
1235 throw new NotSupportedException ();
1236 }
1237
1238 /// <remarks>
1239 /// If we have a MemberCache, return it. This property may return null if the
1240 /// class doesn't have a member cache or while it's still being created.
1241 /// </remarks>
1242 public abstract MemberCache MemberCache {
1243 get;
1244 }
1245
1246 public virtual ModuleContainer Module {
1247 get { return Parent.Module; }
1248 }
1249
1250 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb, PredefinedAttributes pa)
1251 {
1252 if (a.Type == pa.Required) {
1253 Report.Error (1608, a.Location, "The RequiredAttribute attribute is not permitted on C# types");
1254 return;
1255 }
1256 TypeBuilder.SetCustomAttribute (cb);
1257 }
1258
1259 TypeParameter[] initialize_type_params ()
1260 {
1261 if (type_param_list != null)
1262 return type_param_list;
1263
1264 DeclSpace the_parent = Parent;
1265 if (this is GenericMethod)
1266 the_parent = null;
1267
1268 ArrayList list = new ArrayList ();
1269 if (the_parent != null && the_parent.IsGeneric) {
1270 // FIXME: move generics info out of DeclSpace
1271 TypeParameter[] parent_params = the_parent.PartialContainer.TypeParameters;
1272 list.AddRange (parent_params);
1273 }
1274
1275 int count = type_params != null ? type_params.Length : 0;
1276 for (int i = 0; i < count; i++) {
1277 TypeParameter param = type_params [i];
1278 list.Add (param);
1279 if (Parent.IsGeneric) {
1280 foreach (TypeParameter tp in Parent.PartialContainer.CurrentTypeParameters) {
1281 if (tp.Name != param.Name)
1282 continue;
1283
1284 Report.SymbolRelatedToPreviousError (tp.Location, null);
1285 Report.Warning (693, 3, param.Location,
1286 "Type parameter `{0}' has the same name as the type parameter from outer type `{1}'",
1287 param.Name, Parent.GetSignatureForError ());
1288 }
1289 }
1290 }
1291
1292 type_param_list = new TypeParameter [list.Count];
1293 list.CopyTo (type_param_list, 0);
1294 return type_param_list;
1295 }
1296
1297 public virtual void SetParameterInfo (ArrayList constraints_list)
1298 {
1299 if (!is_generic) {
1300 if (constraints_list != null) {
1301 Report.Error (
1302 80, Location, "Constraints are not allowed " +
1303 "on non-generic declarations");
1304 }
1305
1306 return;
1307 }
1308
1309 TypeParameterName[] names = MemberName.TypeArguments.GetDeclarations ();
1310 type_params = new TypeParameter [names.Length];
1311
1312 //
1313 // Register all the names
1314 //
1315 for (int i = 0; i < type_params.Length; i++) {
1316 TypeParameterName name = names [i];
1317
1318 Constraints constraints = null;
1319 if (constraints_list != null) {
1320 int total = constraints_list.Count;
1321 for (int ii = 0; ii < total; ++ii) {
1322 Constraints constraints_at = (Constraints)constraints_list[ii];
1323 // TODO: it is used by iterators only
1324 if (constraints_at == null) {
1325 constraints_list.RemoveAt (ii);
1326 --total;
1327 continue;
1328 }
1329 if (constraints_at.TypeParameter == name.Name) {
1330 constraints = constraints_at;
1331 constraints_list.RemoveAt(ii);
1332 break;
1333 }
1334 }
1335 }
1336
1337 Variance variance = name.Variance;
1338 if (name.Variance != Variance.None && !(this is Delegate || this is Interface)) {
1339 Report.Error (1960, name.Location, "Variant type parameters can only be used with interfaces and delegates");
1340 variance = Variance.None;
1341 }
1342
1343 type_params [i] = new TypeParameter (
1344 Parent, this, name.Name, constraints, name.OptAttributes, variance, Location);
1345
1346 AddToContainer (type_params [i], name.Name);
1347 }
1348
1349 if (constraints_list != null && constraints_list.Count > 0) {
1350 foreach (Constraints constraint in constraints_list) {
1351 Report.Error(699, constraint.Location, "`{0}': A constraint references nonexistent type parameter `{1}'",
1352 GetSignatureForError (), constraint.TypeParameter);
1353 }
1354 }
1355 }
1356
1357 public TypeParameter[] TypeParameters {
1358 get {
1359 if (!IsGeneric)
1360 throw new InvalidOperationException ();
1361 if ((PartialContainer != null) && (PartialContainer != this))
1362 return PartialContainer.TypeParameters;
1363 if (type_param_list == null)
1364 initialize_type_params ();
1365
1366 return type_param_list;
1367 }
1368 }
1369
1370 public TypeParameter[] CurrentTypeParameters {
1371 get {
1372 if (!IsGeneric)
1373 throw new InvalidOperationException ();
1374
1375 // TODO: Something is seriously broken here
1376 if (type_params == null)
1377 return new TypeParameter [0];
1378
1379 return type_params;
1380 }
1381 }
1382
1383 public int CountTypeParameters {
1384 get {
1385 return count_type_params;
1386 }
1387 }
1388
1389 public TypeParameterExpr LookupGeneric (string name, Location loc)
1390 {
1391 if (!IsGeneric)
1392 return null;
1393
1394 TypeParameter [] current_params;
1395 if (this is TypeContainer)
1396 current_params = PartialContainer.CurrentTypeParameters;
1397 else
1398 current_params = CurrentTypeParameters;
1399
1400 foreach (TypeParameter type_param in current_params) {
1401 if (type_param.Name == name)
1402 return new TypeParameterExpr (type_param, loc);
1403 }
1404
1405 if (Parent != null)
1406 return Parent.LookupGeneric (name, loc);
1407
1408 return null;
1409 }
1410
1411 // Used for error reporting only
1412 public virtual Type LookupAnyGeneric (string typeName)
1413 {
1414 return NamespaceEntry.NS.LookForAnyGenericType (typeName);
1415 }
1416
1417 public override string[] ValidAttributeTargets {
1418 get { return attribute_targets; }
1419 }
1420
1421 protected override bool VerifyClsCompliance ()
1422 {
1423 if (!base.VerifyClsCompliance ()) {
1424 return false;
1425 }
1426
1427 if (type_params != null) {
1428 foreach (TypeParameter tp in type_params) {
1429 if (tp.Constraints == null)
1430 continue;
1431
1432 tp.Constraints.VerifyClsCompliance ();
1433 }
1434 }
1435
1436 IDictionary cache = TypeManager.AllClsTopLevelTypes;
1437 if (cache == null)
1438 return true;
1439
1440 string lcase = Name.ToLower (System.Globalization.CultureInfo.InvariantCulture);
1441 if (!cache.Contains (lcase)) {
1442 cache.Add (lcase, this);
1443 return true;
1444 }
1445
1446 object val = cache [lcase];
1447 if (val == null) {
1448 Type t = AttributeTester.GetImportedIgnoreCaseClsType (lcase);
1449 if (t == null)
1450 return true;
1451 Report.SymbolRelatedToPreviousError (t);
1452 }
1453 else {
1454 Report.SymbolRelatedToPreviousError ((DeclSpace)val);
1455 }
1456
1457 Report.Warning (3005, 1, Location, "Identifier `{0}' differing only in case is not CLS-compliant", GetSignatureForError ());
1458 return true;
1459 }
1460 }
1461
1462 /// <summary>
1463 /// This is a readonly list of MemberInfo's.
1464 /// </summary>
1465 public class MemberList : IList {
1466 public readonly IList List;
1467 int count;
1468
1469 /// <summary>
1470 /// Create a new MemberList from the given IList.
1471 /// </summary>
1472 public MemberList (IList list)
1473 {
1474 if (list != null)
1475 this.List = list;
1476 else
1477 this.List = new ArrayList ();
1478 count = List.Count;
1479 }
1480
1481 /// <summary>
1482 /// Concatenate the ILists `first' and `second' to a new MemberList.
1483 /// </summary>
1484 public MemberList (IList first, IList second)
1485 {
1486 ArrayList list = new ArrayList ();
1487 list.AddRange (first);
1488 list.AddRange (second);
1489 count = list.Count;
1490 List = list;
1491 }
1492
1493 public static readonly MemberList Empty = new MemberList (new ArrayList (0));
1494
1495 /// <summary>
1496 /// Cast the MemberList into a MemberInfo[] array.
1497 /// </summary>
1498 /// <remarks>
1499 /// This is an expensive operation, only use it if it's really necessary.
1500 /// </remarks>
1501 public static explicit operator MemberInfo [] (MemberList list)
1502 {
1503 Timer.StartTimer (TimerType.MiscTimer);
1504 MemberInfo [] result = new MemberInfo [list.Count];
1505 list.CopyTo (result, 0);
1506 Timer.StopTimer (TimerType.MiscTimer);
1507 return result;
1508 }
1509
1510 // ICollection
1511
1512 public int Count {
1513 get {
1514 return count;
1515 }
1516 }
1517
1518 public bool IsSynchronized {
1519 get {
1520 return List.IsSynchronized;
1521 }
1522 }
1523
1524 public object SyncRoot {
1525 get {
1526 return List.SyncRoot;
1527 }
1528 }
1529
1530 public void CopyTo (Array array, int index)
1531 {
1532 List.CopyTo (array, index);
1533 }
1534
1535 // IEnumerable
1536
1537 public IEnumerator GetEnumerator ()
1538 {
1539 return List.GetEnumerator ();
1540 }
1541
1542 // IList
1543
1544 public bool IsFixedSize {
1545 get {
1546 return true;
1547 }
1548 }
1549
1550 public bool IsReadOnly {
1551 get {
1552 return true;
1553 }
1554 }
1555
1556 object IList.this [int index] {
1557 get {
1558 return List [index];
1559 }
1560
1561 set {
1562 throw new NotSupportedException ();
1563 }
1564 }
1565
1566 // FIXME: try to find out whether we can avoid the cast in this indexer.
1567 public MemberInfo this [int index] {
1568 get {
1569 return (MemberInfo) List [index];
1570 }
1571 }
1572
1573 public int Add (object value)
1574 {
1575 throw new NotSupportedException ();
1576 }
1577
1578 public void Clear ()
1579 {
1580 throw new NotSupportedException ();
1581 }
1582
1583 public bool Contains (object value)
1584 {
1585 return List.Contains (value);
1586 }
1587
1588 public int IndexOf (object value)
1589 {
1590 return List.IndexOf (value);
1591 }
1592
1593 public void Insert (int index, object value)
1594 {
1595 throw new NotSupportedException ();
1596 }
1597
1598 public void Remove (object value)
1599 {
1600 throw new NotSupportedException ();
1601 }
1602
1603 public void RemoveAt (int index)
1604 {
1605 throw new NotSupportedException ();
1606 }
1607 }
1608
1609 /// <summary>
1610 /// This interface is used to get all members of a class when creating the
1611 /// member cache. It must be implemented by all DeclSpace derivatives which
1612 /// want to support the member cache and by TypeHandle to get caching of
1613 /// non-dynamic types.
1614 /// </summary>
1615 public interface IMemberContainer {
1616 /// <summary>
1617 /// The name of the IMemberContainer. This is only used for
1618 /// debugging purposes.
1619 /// </summary>
1620 string Name {
1621 get;
1622 }
1623
1624 /// <summary>
1625 /// The type of this IMemberContainer.
1626 /// </summary>
1627 Type Type {
1628 get;
1629 }
1630
1631 /// <summary>
1632 /// Returns the IMemberContainer of the base class or null if this
1633 /// is an interface or TypeManger.object_type.
1634 /// This is used when creating the member cache for a class to get all
1635 /// members from the base class.
1636 /// </summary>
1637 MemberCache BaseCache {
1638 get;
1639 }
1640
1641 /// <summary>
1642 /// Whether this is an interface.
1643 /// </summary>
1644 bool IsInterface {
1645 get;
1646 }
1647
1648 /// <summary>
1649 /// Returns all members of this class with the corresponding MemberTypes
1650 /// and BindingFlags.
1651 /// </summary>
1652 /// <remarks>
1653 /// When implementing this method, make sure not to return any inherited
1654 /// members and check the MemberTypes and BindingFlags properly.
1655 /// Unfortunately, System.Reflection is lame and doesn't provide a way to
1656 /// get the BindingFlags (static/non-static,public/non-public) in the
1657 /// MemberInfo class, but the cache needs this information. That's why
1658 /// this method is called multiple times with different BindingFlags.
1659 /// </remarks>
1660 MemberList GetMembers (MemberTypes mt, BindingFlags bf);
1661 }
1662
1663 /// <summary>
1664 /// The MemberCache is used by dynamic and non-dynamic types to speed up
1665 /// member lookups. It has a member name based hash table; it maps each member
1666 /// name to a list of CacheEntry objects. Each CacheEntry contains a MemberInfo
1667 /// and the BindingFlags that were initially used to get it. The cache contains
1668 /// all members of the current class and all inherited members. If this cache is
1669 /// for an interface types, it also contains all inherited members.
1670 ///
1671 /// There are two ways to get a MemberCache:
1672 /// * if this is a dynamic type, lookup the corresponding DeclSpace and then
1673 /// use the DeclSpace.MemberCache property.
1674 /// * if this not a dynamic type, call TypeHandle.GetTypeHandle() to get a
1675 /// TypeHandle instance for the type and then use TypeHandle.MemberCache.
1676 /// </summary>
1677 public class MemberCache {
1678 public readonly IMemberContainer Container;
1679 protected Hashtable member_hash;
1680 protected Hashtable method_hash;
1681
1682 /// <summary>
1683 /// Create a new MemberCache for the given IMemberContainer `container'.
1684 /// </summary>
1685 public MemberCache (IMemberContainer container)
1686 {
1687 this.Container = container;
1688
1689 Timer.IncrementCounter (CounterType.MemberCache);
1690 Timer.StartTimer (TimerType.CacheInit);
1691
1692 // If we have a base class (we have a base class unless we're
1693 // TypeManager.object_type), we deep-copy its MemberCache here.
1694 if (Container.BaseCache != null)
1695 member_hash = SetupCache (Container.BaseCache);
1696 else
1697 member_hash = new Hashtable ();
1698
1699 // If this is neither a dynamic type nor an interface, create a special
1700 // method cache with all declared and inherited methods.
1701 Type type = container.Type;
1702 if (!(type is TypeBuilder) && !type.IsInterface &&
1703 // !(type.IsGenericType && (type.GetGenericTypeDefinition () is TypeBuilder)) &&
1704 !TypeManager.IsGenericType (type) && !TypeManager.IsGenericParameter (type) &&
1705 (Container.BaseCache == null || Container.BaseCache.method_hash != null)) {
1706 method_hash = new Hashtable ();
1707 AddMethods (type);
1708 }
1709
1710 // Add all members from the current class.
1711 AddMembers (Container);
1712
1713 Timer.StopTimer (TimerType.CacheInit);
1714 }
1715
1716 public MemberCache (Type baseType, IMemberContainer container)
1717 {
1718 this.Container = container;
1719 if (baseType == null)
1720 this.member_hash = new Hashtable ();
1721 else
1722 this.member_hash = SetupCache (TypeManager.LookupMemberCache (baseType));
1723 }
1724
1725 public MemberCache (Type[] ifaces)
1726 {
1727 //
1728 // The members of this cache all belong to other caches.
1729 // So, 'Container' will not be used.
1730 //
1731 this.Container = null;
1732
1733 member_hash = new Hashtable ();
1734 if (ifaces == null)
1735 return;
1736
1737 foreach (Type itype in ifaces)
1738 AddCacheContents (TypeManager.LookupMemberCache (itype));
1739 }
1740
1741 public MemberCache (IMemberContainer container, Type base_class, Type[] ifaces)
1742 {
1743 this.Container = container;
1744
1745 // If we have a base class (we have a base class unless we're
1746 // TypeManager.object_type), we deep-copy its MemberCache here.
1747 if (Container.BaseCache != null)
1748 member_hash = SetupCache (Container.BaseCache);
1749 else
1750 member_hash = new Hashtable ();
1751
1752 if (base_class != null)
1753 AddCacheContents (TypeManager.LookupMemberCache (base_class));
1754 if (ifaces != null) {
1755 foreach (Type itype in ifaces) {
1756 MemberCache cache = TypeManager.LookupMemberCache (itype);
1757 if (cache != null)
1758 AddCacheContents (cache);
1759 }
1760 }
1761 }
1762
1763 /// <summary>
1764 /// Bootstrap this member cache by doing a deep-copy of our base.
1765 /// </summary>
1766 static Hashtable SetupCache (MemberCache base_class)
1767 {
1768 if (base_class == null)
1769 return new Hashtable ();
1770
1771 Hashtable hash = new Hashtable (base_class.member_hash.Count);
1772 IDictionaryEnumerator it = base_class.member_hash.GetEnumerator ();
1773 while (it.MoveNext ()) {
1774 hash.Add (it.Key, ((ArrayList) it.Value).Clone ());
1775 }
1776
1777 return hash;
1778 }
1779
1780 //
1781 // Converts ModFlags to BindingFlags
1782 //
1783 static BindingFlags GetBindingFlags (int modifiers)
1784 {
1785 BindingFlags bf;
1786 if ((modifiers & Modifiers.STATIC) != 0)
1787 bf = BindingFlags.Static;
1788 else
1789 bf = BindingFlags.Instance;
1790
1791 if ((modifiers & Modifiers.PRIVATE) != 0)
1792 bf |= BindingFlags.NonPublic;
1793 else
1794 bf |= BindingFlags.Public;
1795
1796 return bf;
1797 }
1798
1799 /// <summary>
1800 /// Add the contents of `cache' to the member_hash.
1801 /// </summary>
1802 void AddCacheContents (MemberCache cache)
1803 {
1804 IDictionaryEnumerator it = cache.member_hash.GetEnumerator ();
1805 while (it.MoveNext ()) {
1806 ArrayList list = (ArrayList) member_hash [it.Key];
1807 if (list == null)
1808 member_hash [it.Key] = list = new ArrayList ();
1809
1810 ArrayList entries = (ArrayList) it.Value;
1811 for (int i = entries.Count-1; i >= 0; i--) {
1812 CacheEntry entry = (CacheEntry) entries [i];
1813
1814 if (entry.Container != cache.Container)
1815 break;
1816 list.Add (entry);
1817 }
1818 }
1819 }
1820
1821 /// <summary>
1822 /// Add all members from class `container' to the cache.
1823 /// </summary>
1824 void AddMembers (IMemberContainer container)
1825 {
1826 // We need to call AddMembers() with a single member type at a time
1827 // to get the member type part of CacheEntry.EntryType right.
1828 if (!container.IsInterface) {
1829 AddMembers (MemberTypes.Constructor, container);
1830 AddMembers (MemberTypes.Field, container);
1831 }
1832 AddMembers (MemberTypes.Method, container);
1833 AddMembers (MemberTypes.Property, container);
1834 AddMembers (MemberTypes.Event, container);
1835 // Nested types are returned by both Static and Instance searches.
1836 AddMembers (MemberTypes.NestedType,
1837 BindingFlags.Static | BindingFlags.Public, container);
1838 AddMembers (MemberTypes.NestedType,
1839 BindingFlags.Static | BindingFlags.NonPublic, container);
1840 }
1841
1842 void AddMembers (MemberTypes mt, IMemberContainer container)
1843 {
1844 AddMembers (mt, BindingFlags.Static | BindingFlags.Public, container);
1845 AddMembers (mt, BindingFlags.Static | BindingFlags.NonPublic, container);
1846 AddMembers (mt, BindingFlags.Instance | BindingFlags.Public, container);
1847 AddMembers (mt, BindingFlags.Instance | BindingFlags.NonPublic, container);
1848 }
1849
1850 public void AddMember (MemberInfo mi, MemberCore mc)
1851 {
1852 AddMember (mi.MemberType, GetBindingFlags (mc.ModFlags), Container, mi.Name, mi);
1853 }
1854
1855 public void AddGenericMember (MemberInfo mi, InterfaceMemberBase mc)
1856 {
1857 AddMember (mi.MemberType, GetBindingFlags (mc.ModFlags), Container,
1858 MemberName.MakeName (mc.GetFullName (mc.MemberName), mc.MemberName.TypeArguments), mi);
1859 }
1860
1861 public void AddNestedType (DeclSpace type)
1862 {
1863 AddMember (MemberTypes.NestedType, GetBindingFlags (type.ModFlags), (IMemberContainer) type.Parent,
1864 type.TypeBuilder.Name, type.TypeBuilder);
1865 }
1866
1867 public void AddInterface (MemberCache baseCache)
1868 {
1869 if (baseCache.member_hash.Count > 0)
1870 AddCacheContents (baseCache);
1871 }
1872
1873 void AddMember (MemberTypes mt, BindingFlags bf, IMemberContainer container,
1874 string name, MemberInfo member)
1875 {
1876 // We use a name-based hash table of ArrayList's.
1877 ArrayList list = (ArrayList) member_hash [name];
1878 if (list == null) {
1879 list = new ArrayList (1);
1880 member_hash.Add (name, list);
1881 }
1882
1883 // When this method is called for the current class, the list will
1884 // already contain all inherited members from our base classes.
1885 // We cannot add new members in front of the list since this'd be an
1886 // expensive operation, that's why the list is sorted in reverse order
1887 // (ie. members from the current class are coming last).
1888 list.Add (new CacheEntry (container, member, mt, bf));
1889 }
1890
1891 /// <summary>
1892 /// Add all members from class `container' with the requested MemberTypes and
1893 /// BindingFlags to the cache. This method is called multiple times with different
1894 /// MemberTypes and BindingFlags.
1895 /// </summary>
1896 void AddMembers (MemberTypes mt, BindingFlags bf, IMemberContainer container)
1897 {
1898 MemberList members = container.GetMembers (mt, bf);
1899
1900 foreach (MemberInfo member in members) {
1901 string name = member.Name;
1902
1903 AddMember (mt, bf, container, name, member);
1904
1905 if (member is MethodInfo) {
1906 string gname = TypeManager.GetMethodName ((MethodInfo) member);
1907 if (gname != name)
1908 AddMember (mt, bf, container, gname, member);
1909 }
1910 }
1911 }
1912
1913 /// <summary>
1914 /// Add all declared and inherited methods from class `type' to the method cache.
1915 /// </summary>
1916 void AddMethods (Type type)
1917 {
1918 AddMethods (BindingFlags.Static | BindingFlags.Public |
1919 BindingFlags.FlattenHierarchy, type);
1920 AddMethods (BindingFlags.Static | BindingFlags.NonPublic |
1921 BindingFlags.FlattenHierarchy, type);
1922 AddMethods (BindingFlags.Instance | BindingFlags.Public, type);
1923 AddMethods (BindingFlags.Instance | BindingFlags.NonPublic, type);
1924 }
1925
1926 static ArrayList overrides = new ArrayList ();
1927
1928 void AddMethods (BindingFlags bf, Type type)
1929 {
1930 MethodBase [] members = type.GetMethods (bf);
1931
1932 Array.Reverse (members);
1933
1934 foreach (MethodBase member in members) {
1935 string name = member.Name;
1936
1937 // We use a name-based hash table of ArrayList's.
1938 ArrayList list = (ArrayList) method_hash [name];
1939 if (list == null) {
1940 list = new ArrayList (1);
1941 method_hash.Add (name, list);
1942 }
1943
1944 MethodInfo curr = (MethodInfo) member;
1945 while (curr.IsVirtual && (curr.Attributes & MethodAttributes.NewSlot) == 0) {
1946 MethodInfo base_method = curr.GetBaseDefinition ();
1947
1948 if (base_method == curr)
1949 // Not every virtual function needs to have a NewSlot flag.
1950 break;
1951
1952 overrides.Add (curr);
1953 list.Add (new CacheEntry (null, base_method, MemberTypes.Method, bf));
1954 curr = base_method;
1955 }
1956
1957 if (overrides.Count > 0) {
1958 for (int i = 0; i < overrides.Count; ++i)
1959 TypeManager.RegisterOverride ((MethodBase) overrides [i], curr);
1960 overrides.Clear ();
1961 }
1962
1963 // Unfortunately, the elements returned by Type.GetMethods() aren't
1964 // sorted so we need to do this check for every member.
1965 BindingFlags new_bf = bf;
1966 if (member.DeclaringType == type)
1967 new_bf |= BindingFlags.DeclaredOnly;
1968
1969 list.Add (new CacheEntry (Container, member, MemberTypes.Method, new_bf));
1970 }
1971 }
1972
1973 /// <summary>
1974 /// Compute and return a appropriate `EntryType' magic number for the given
1975 /// MemberTypes and BindingFlags.
1976 /// </summary>
1977 protected static EntryType GetEntryType (MemberTypes mt, BindingFlags bf)
1978 {
1979 EntryType type = EntryType.None;
1980
1981 if ((mt & MemberTypes.Constructor) != 0)
1982 type |= EntryType.Constructor;
1983 if ((mt & MemberTypes.Event) != 0)
1984 type |= EntryType.Event;
1985 if ((mt & MemberTypes.Field) != 0)
1986 type |= EntryType.Field;
1987 if ((mt & MemberTypes.Method) != 0)
1988 type |= EntryType.Method;
1989 if ((mt & MemberTypes.Property) != 0)
1990 type |= EntryType.Property;
1991 // Nested types are returned by static and instance searches.
1992 if ((mt & MemberTypes.NestedType) != 0)
1993 type |= EntryType.NestedType | EntryType.Static | EntryType.Instance;
1994
1995 if ((bf & BindingFlags.Instance) != 0)
1996 type |= EntryType.Instance;
1997 if ((bf & BindingFlags.Static) != 0)
1998 type |= EntryType.Static;
1999 if ((bf & BindingFlags.Public) != 0)
2000 type |= EntryType.Public;
2001 if ((bf & BindingFlags.NonPublic) != 0)
2002 type |= EntryType.NonPublic;
2003 if ((bf & BindingFlags.DeclaredOnly) != 0)
2004 type |= EntryType.Declared;
2005
2006 return type;
2007 }
2008
2009 /// <summary>
2010 /// The `MemberTypes' enumeration type is a [Flags] type which means that it may
2011 /// denote multiple member types. Returns true if the given flags value denotes a
2012 /// single member types.
2013 /// </summary>
2014 public static bool IsSingleMemberType (MemberTypes mt)
2015 {
2016 switch (mt) {
2017 case MemberTypes.Constructor:
2018 case MemberTypes.Event:
2019 case MemberTypes.Field:
2020 case MemberTypes.Method:
2021 case MemberTypes.Property:
2022 case MemberTypes.NestedType:
2023 return true;
2024
2025 default:
2026 return false;
2027 }
2028 }
2029
2030 /// <summary>
2031 /// We encode the MemberTypes and BindingFlags of each members in a "magic"
2032 /// number to speed up the searching process.
2033 /// </summary>
2034 [Flags]
2035 protected enum EntryType {
2036 None = 0x000,
2037
2038 Instance = 0x001,
2039 Static = 0x002,
2040 MaskStatic = Instance|Static,
2041
2042 Public = 0x004,
2043 NonPublic = 0x008,
2044 MaskProtection = Public|NonPublic,
2045
2046 Declared = 0x010,
2047
2048 Constructor = 0x020,
2049 Event = 0x040,
2050 Field = 0x080,
2051 Method = 0x100,
2052 Property = 0x200,
2053 NestedType = 0x400,
2054
2055 NotExtensionMethod = 0x800,
2056
2057 MaskType = Constructor|Event|Field|Method|Property|NestedType
2058 }
2059
2060 protected class CacheEntry {
2061 public readonly IMemberContainer Container;
2062 public EntryType EntryType;
2063 public readonly MemberInfo Member;
2064
2065 public CacheEntry (IMemberContainer container, MemberInfo member,
2066 MemberTypes mt, BindingFlags bf)
2067 {
2068 this.Container = container;
2069 this.Member = member;
2070 this.EntryType = GetEntryType (mt, bf);
2071 }
2072
2073 public override string ToString ()
2074 {
2075 return String.Format ("CacheEntry ({0}:{1}:{2})", Container.Name,
2076 EntryType, Member);
2077 }
2078 }
2079
2080 /// <summary>
2081 /// This is called each time we're walking up one level in the class hierarchy
2082 /// and checks whether we can abort the search since we've already found what
2083 /// we were looking for.
2084 /// </summary>
2085 protected bool DoneSearching (ArrayList list)
2086 {
2087 //
2088 // We've found exactly one member in the current class and it's not
2089 // a method or constructor.
2090 //
2091 if (list.Count == 1 && !(list [0] is MethodBase))
2092 return true;
2093
2094 //
2095 // Multiple properties: we query those just to find out the indexer
2096 // name
2097 //
2098 if ((list.Count > 0) && (list [0] is PropertyInfo))
2099 return true;
2100
2101 return false;
2102 }
2103
2104 /// <summary>
2105 /// Looks up members with name `name'. If you provide an optional
2106 /// filter function, it'll only be called with members matching the
2107 /// requested member name.
2108 ///
2109 /// This method will try to use the cache to do the lookup if possible.
2110 ///
2111 /// Unlike other FindMembers implementations, this method will always
2112 /// check all inherited members - even when called on an interface type.
2113 ///
2114 /// If you know that you're only looking for methods, you should use
2115 /// MemberTypes.Method alone since this speeds up the lookup a bit.
2116 /// When doing a method-only search, it'll try to use a special method
2117 /// cache (unless it's a dynamic type or an interface) and the returned
2118 /// MemberInfo's will have the correct ReflectedType for inherited methods.
2119 /// The lookup process will automatically restart itself in method-only
2120 /// search mode if it discovers that it's about to return methods.
2121 /// </summary>
2122 ArrayList global = new ArrayList ();
2123 bool using_global = false;
2124
2125 static MemberInfo [] emptyMemberInfo = new MemberInfo [0];
2126
2127 public MemberInfo [] FindMembers (MemberTypes mt, BindingFlags bf, string name,
2128 MemberFilter filter, object criteria)
2129 {
2130 if (using_global)
2131 throw new Exception ();
2132
2133 bool declared_only = (bf & BindingFlags.DeclaredOnly) != 0;
2134 bool method_search = mt == MemberTypes.Method;
2135 // If we have a method cache and we aren't already doing a method-only search,
2136 // then we restart a method search if the first match is a method.
2137 bool do_method_search = !method_search && (method_hash != null);
2138
2139 ArrayList applicable;
2140
2141 // If this is a method-only search, we try to use the method cache if
2142 // possible; a lookup in the method cache will return a MemberInfo with
2143 // the correct ReflectedType for inherited methods.
2144
2145 if (method_search && (method_hash != null))
2146 applicable = (ArrayList) method_hash [name];
2147 else
2148 applicable = (ArrayList) member_hash [name];
2149
2150 if (applicable == null)
2151 return emptyMemberInfo;
2152
2153 //
2154 // 32 slots gives 53 rss/54 size
2155 // 2/4 slots gives 55 rss
2156 //
2157 // Strange: from 25,000 calls, only 1,800
2158 // are above 2. Why does this impact it?
2159 //
2160 global.Clear ();
2161 using_global = true;
2162
2163 Timer.StartTimer (TimerType.CachedLookup);
2164
2165 EntryType type = GetEntryType (mt, bf);
2166
2167 IMemberContainer current = Container;
2168
2169 bool do_interface_search = current.IsInterface;
2170
2171 // `applicable' is a list of all members with the given member name `name'
2172 // in the current class and all its base classes. The list is sorted in
2173 // reverse order due to the way how the cache is initialy created (to speed
2174 // things up, we're doing a deep-copy of our base).
2175
2176 for (int i = applicable.Count-1; i >= 0; i--) {
2177 CacheEntry entry = (CacheEntry) applicable [i];
2178
2179 // This happens each time we're walking one level up in the class
2180 // hierarchy. If we're doing a DeclaredOnly search, we must abort
2181 // the first time this happens (this may already happen in the first
2182 // iteration of this loop if there are no members with the name we're
2183 // looking for in the current class).
2184 if (entry.Container != current) {
2185 if (declared_only)
2186 break;
2187
2188 if (!do_interface_search && DoneSearching (global))
2189 break;
2190
2191 current = entry.Container;
2192 }
2193
2194 // Is the member of the correct type ?
2195 if ((entry.EntryType & type & EntryType.MaskType) == 0)
2196 continue;
2197
2198 // Is the member static/non-static ?
2199 if ((entry.EntryType & type & EntryType.MaskStatic) == 0)
2200 continue;
2201
2202 // Apply the filter to it.
2203 if (filter (entry.Member, criteria)) {
2204 if ((entry.EntryType & EntryType.MaskType) != EntryType.Method) {
2205 do_method_search = false;
2206 }
2207
2208 // Because interfaces support multiple inheritance we have to be sure that
2209 // base member is from same interface, so only top level member will be returned
2210 if (do_interface_search && global.Count > 0) {
2211 bool member_already_exists = false;
2212
2213 foreach (MemberInfo mi in global) {
2214 if (mi is MethodBase)
2215 continue;
2216
2217 if (IsInterfaceBaseInterface (TypeManager.GetInterfaces (mi.DeclaringType), entry.Member.DeclaringType)) {
2218 member_already_exists = true;
2219 break;
2220 }
2221 }
2222 if (member_already_exists)
2223 continue;
2224 }
2225
2226 global.Add (entry.Member);
2227 }
2228 }
2229
2230 Timer.StopTimer (TimerType.CachedLookup);
2231
2232 // If we have a method cache and we aren't already doing a method-only
2233 // search, we restart in method-only search mode if the first match is
2234 // a method. This ensures that we return a MemberInfo with the correct
2235 // ReflectedType for inherited methods.
2236 if (do_method_search && (global.Count > 0)){
2237 using_global = false;
2238
2239 return FindMembers (MemberTypes.Method, bf, name, filter, criteria);
2240 }
2241
2242 using_global = false;
2243 MemberInfo [] copy = new MemberInfo [global.Count];
2244 global.CopyTo (copy);
2245 return copy;
2246 }
2247
2248 /// <summary>
2249 /// Returns true if iterface exists in any base interfaces (ifaces)
2250 /// </summary>
2251 static bool IsInterfaceBaseInterface (Type[] ifaces, Type ifaceToFind)
2252 {
2253 foreach (Type iface in ifaces) {
2254 if (iface == ifaceToFind)
2255 return true;
2256
2257 Type[] base_ifaces = TypeManager.GetInterfaces (iface);
2258 if (base_ifaces.Length > 0 && IsInterfaceBaseInterface (base_ifaces, ifaceToFind))
2259 return true;
2260 }
2261 return false;
2262 }
2263
2264 // find the nested type @name in @this.
2265 public Type FindNestedType (string name)
2266 {
2267 ArrayList applicable = (ArrayList) member_hash [name];
2268 if (applicable == null)
2269 return null;
2270
2271 for (int i = applicable.Count-1; i >= 0; i--) {
2272 CacheEntry entry = (CacheEntry) applicable [i];
2273 if ((entry.EntryType & EntryType.NestedType & EntryType.MaskType) != 0)
2274 return (Type) entry.Member;
2275 }
2276
2277 return null;
2278 }
2279
2280 public MemberInfo FindBaseEvent (Type invocation_type, string name)
2281 {
2282 ArrayList applicable = (ArrayList) member_hash [name];
2283 if (applicable == null)
2284 return null;
2285
2286 //
2287 // Walk the chain of events, starting from the top.
2288 //
2289 for (int i = applicable.Count - 1; i >= 0; i--)
2290 {
2291 CacheEntry entry = (CacheEntry) applicable [i];
2292 if ((entry.EntryType & EntryType.Event) == 0)
2293 continue;
2294
2295 EventInfo ei = (EventInfo)entry.Member;
2296 return ei.GetAddMethod (true);
2297 }
2298
2299 return null;
2300 }
2301
2302 //
2303 // Looks for extension methods with defined name and extension type
2304 //
2305 public ArrayList FindExtensionMethods (Type extensionType, string name, bool publicOnly)
2306 {
2307 ArrayList entries;
2308 if (method_hash != null)
2309 entries = (ArrayList)method_hash [name];
2310 else
2311 entries = (ArrayList)member_hash [name];
2312
2313 if (entries == null)
2314 return null;
2315
2316 EntryType entry_type = EntryType.Static | EntryType.Method | EntryType.NotExtensionMethod;
2317 EntryType found_entry_type = entry_type & ~EntryType.NotExtensionMethod;
2318
2319 ArrayList candidates = null;
2320 foreach (CacheEntry entry in entries) {
2321 if ((entry.EntryType & entry_type) == found_entry_type) {
2322 MethodBase mb = (MethodBase)entry.Member;
2323
2324 // Simple accessibility check
2325 if ((entry.EntryType & EntryType.Public) == 0 && publicOnly) {
2326 MethodAttributes ma = mb.Attributes & MethodAttributes.MemberAccessMask;
2327 if (ma != MethodAttributes.Assembly && ma != MethodAttributes.FamORAssem)
2328 continue;
2329
2330 if (!TypeManager.IsThisOrFriendAssembly (mb.DeclaringType.Assembly))
2331 continue;
2332 }
2333
2334 IMethodData md = TypeManager.GetMethod (mb);
2335 AParametersCollection pd = md == null ?
2336 TypeManager.GetParameterData (mb) : md.ParameterInfo;
2337
2338 Type ex_type = pd.ExtensionMethodType;
2339 if (ex_type == null) {
2340 entry.EntryType |= EntryType.NotExtensionMethod;
2341 continue;
2342 }
2343
2344 //if (implicit conversion between ex_type and extensionType exist) {
2345 if (candidates == null)
2346 candidates = new ArrayList (2);
2347 candidates.Add (mb);
2348 //}
2349 }
2350 }
2351
2352 return candidates;
2353 }
2354
2355 //
2356 // This finds the method or property for us to override. invocation_type is the type where
2357 // the override is going to be declared, name is the name of the method/property, and
2358 // param_types is the parameters, if any to the method or property
2359 //
2360 // Because the MemberCache holds members from this class and all the base classes,
2361 // we can avoid tons of reflection stuff.
2362 //
2363 public MemberInfo FindMemberToOverride (Type invocation_type, string name, AParametersCollection parameters, GenericMethod generic_method, bool is_property)
2364 {
2365 ArrayList applicable;
2366 if (method_hash != null && !is_property)
2367 applicable = (ArrayList) method_hash [name];
2368 else
2369 applicable = (ArrayList) member_hash [name];
2370
2371 if (applicable == null)
2372 return null;
2373 //
2374 // Walk the chain of methods, starting from the top.
2375 //
2376 for (int i = applicable.Count - 1; i >= 0; i--) {
2377 CacheEntry entry = (CacheEntry) applicable [i];
2378
2379 if ((entry.EntryType & (is_property ? (EntryType.Property | EntryType.Field) : EntryType.Method)) == 0)
2380 continue;
2381
2382 PropertyInfo pi = null;
2383 MethodInfo mi = null;
2384 FieldInfo fi = null;
2385 AParametersCollection cmp_attrs;
2386
2387 if (is_property) {
2388 if ((entry.EntryType & EntryType.Field) != 0) {
2389 fi = (FieldInfo)entry.Member;
2390 cmp_attrs = ParametersCompiled.EmptyReadOnlyParameters;
2391 } else {
2392 pi = (PropertyInfo) entry.Member;
2393 cmp_attrs = TypeManager.GetParameterData (pi);
2394 }
2395 } else {
2396 mi = (MethodInfo) entry.Member;
2397 cmp_attrs = TypeManager.GetParameterData (mi);
2398 }
2399
2400 if (fi != null) {
2401 // TODO: Almost duplicate !
2402 // Check visibility
2403 switch (fi.Attributes & FieldAttributes.FieldAccessMask) {
2404 case FieldAttributes.PrivateScope:
2405 continue;
2406 case FieldAttributes.Private:
2407 //
2408 // A private method is Ok if we are a nested subtype.
2409 // The spec actually is not very clear about this, see bug 52458.
2410 //
2411 if (!invocation_type.Equals (entry.Container.Type) &&
2412 !TypeManager.IsNestedChildOf (invocation_type, entry.Container.Type))
2413 continue;
2414 break;
2415 case FieldAttributes.FamANDAssem:
2416 case FieldAttributes.Assembly:
2417 //
2418 // Check for assembly methods
2419 //
2420 if (fi.DeclaringType.Assembly != CodeGen.Assembly.Builder)
2421 continue;
2422 break;
2423 }
2424 return entry.Member;
2425 }
2426
2427 //
2428 // Check the arguments
2429 //
2430 if (cmp_attrs.Count != parameters.Count)
2431 continue;
2432
2433 int j;
2434 for (j = 0; j < cmp_attrs.Count; ++j) {
2435 //
2436 // LAMESPEC: No idea why `params' modifier is ignored
2437 //
2438 if ((parameters.FixedParameters [j].ModFlags & ~Parameter.Modifier.PARAMS) !=
2439 (cmp_attrs.FixedParameters [j].ModFlags & ~Parameter.Modifier.PARAMS))
2440 break;
2441
2442 if (!TypeManager.IsEqual (parameters.Types [j], cmp_attrs.Types [j]))
2443 break;
2444 }
2445
2446 if (j < cmp_attrs.Count)
2447 continue;
2448
2449 //
2450 // check generic arguments for methods
2451 //
2452 if (mi != null) {
2453 Type [] cmpGenArgs = TypeManager.GetGenericArguments (mi);
2454 if (generic_method == null && cmpGenArgs != null && cmpGenArgs.Length != 0)
2455 continue;
2456 if (generic_method != null && cmpGenArgs != null && cmpGenArgs.Length != generic_method.TypeParameters.Length)
2457 continue;
2458 }
2459
2460 //
2461 // get one of the methods because this has the visibility info.
2462 //
2463 if (is_property) {
2464 mi = pi.GetGetMethod (true);
2465 if (mi == null)
2466 mi = pi.GetSetMethod (true);
2467 }
2468
2469 //
2470 // Check visibility
2471 //
2472 switch (mi.Attributes & MethodAttributes.MemberAccessMask) {
2473 case MethodAttributes.PrivateScope:
2474 continue;
2475 case MethodAttributes.Private:
2476 //
2477 // A private method is Ok if we are a nested subtype.
2478 // The spec actually is not very clear about this, see bug 52458.
2479 //
2480 if (!invocation_type.Equals (entry.Container.Type) &&
2481 !TypeManager.IsNestedChildOf (invocation_type, entry.Container.Type))
2482 continue;
2483 break;
2484 case MethodAttributes.FamANDAssem:
2485 case MethodAttributes.Assembly:
2486 //
2487 // Check for assembly methods
2488 //
2489 if (!TypeManager.IsThisOrFriendAssembly (mi.DeclaringType.Assembly))
2490 continue;
2491 break;
2492 }
2493 return entry.Member;
2494 }
2495
2496 return null;
2497 }
2498
2499 /// <summary>
2500 /// The method is looking for conflict with inherited symbols (errors CS0108, CS0109).
2501 /// We handle two cases. The first is for types without parameters (events, field, properties).
2502 /// The second are methods, indexers and this is why ignore_complex_types is here.
2503 /// The latest param is temporary hack. See DoDefineMembers method for more info.
2504 /// </summary>
2505 public MemberInfo FindMemberWithSameName (string name, bool ignore_complex_types, MemberInfo ignore_member)
2506 {
2507 ArrayList applicable = null;
2508
2509 if (method_hash != null)
2510 applicable = (ArrayList) method_hash [name];
2511
2512 if (applicable != null) {
2513 for (int i = applicable.Count - 1; i >= 0; i--) {
2514 CacheEntry entry = (CacheEntry) applicable [i];
2515 if ((entry.EntryType & EntryType.Public) != 0)
2516 return entry.Member;
2517 }
2518 }
2519
2520 if (member_hash == null)
2521 return null;
2522 applicable = (ArrayList) member_hash [name];
2523
2524 if (applicable != null) {
2525 for (int i = applicable.Count - 1; i >= 0; i--) {
2526 CacheEntry entry = (CacheEntry) applicable [i];
2527 if ((entry.EntryType & EntryType.Public) != 0 & entry.Member != ignore_member) {
2528 if (ignore_complex_types) {
2529 if ((entry.EntryType & EntryType.Method) != 0)
2530 continue;
2531
2532 // Does exist easier way how to detect indexer ?
2533 if ((entry.EntryType & EntryType.Property) != 0) {
2534 AParametersCollection arg_types = TypeManager.GetParameterData ((PropertyInfo)entry.Member);
2535 if (arg_types.Count > 0)
2536 continue;
2537 }
2538 }
2539 return entry.Member;
2540 }
2541 }
2542 }
2543 return null;
2544 }
2545
2546 Hashtable locase_table;
2547
2548 /// <summary>
2549 /// Builds low-case table for CLS Compliance test
2550 /// </summary>
2551 public Hashtable GetPublicMembers ()
2552 {
2553 if (locase_table != null)
2554 return locase_table;
2555
2556 locase_table = new Hashtable ();
2557 foreach (DictionaryEntry entry in member_hash) {
2558 ArrayList members = (ArrayList)entry.Value;
2559 for (int ii = 0; ii < members.Count; ++ii) {
2560 CacheEntry member_entry = (CacheEntry) members [ii];
2561
2562 if ((member_entry.EntryType & EntryType.Public) == 0)
2563 continue;
2564
2565 // TODO: Does anyone know easier way how to detect that member is internal ?
2566 switch (member_entry.EntryType & EntryType.MaskType) {
2567 case EntryType.Constructor:
2568 continue;
2569
2570 case EntryType.Field:
2571 if ((((FieldInfo)member_entry.Member).Attributes & (FieldAttributes.Assembly | FieldAttributes.Public)) == FieldAttributes.Assembly)
2572 continue;
2573 break;
2574
2575 case EntryType.Method:
2576 if ((((MethodInfo)member_entry.Member).Attributes & (MethodAttributes.Assembly | MethodAttributes.Public)) == MethodAttributes.Assembly)
2577 continue;
2578 break;
2579
2580 case EntryType.Property:
2581 PropertyInfo pi = (PropertyInfo)member_entry.Member;
2582 if (pi.GetSetMethod () == null && pi.GetGetMethod () == null)
2583 continue;
2584 break;
2585
2586 case EntryType.Event:
2587 EventInfo ei = (EventInfo)member_entry.Member;
2588 MethodInfo mi = ei.GetAddMethod ();
2589 if ((mi.Attributes & (MethodAttributes.Assembly | MethodAttributes.Public)) == MethodAttributes.Assembly)
2590 continue;
2591 break;
2592 }
2593 string lcase = ((string)entry.Key).ToLower (System.Globalization.CultureInfo.InvariantCulture);
2594 locase_table [lcase] = member_entry.Member;
2595 break;
2596 }
2597 }
2598 return locase_table;
2599 }
2600
2601 public Hashtable Members {
2602 get {
2603 return member_hash;
2604 }
2605 }
2606
2607 /// <summary>
2608 /// Cls compliance check whether methods or constructors parameters differing only in ref or out, or in array rank
2609 /// </summary>
2610 ///
2611 // TODO: refactor as method is always 'this'
2612 public static void VerifyClsParameterConflict (ArrayList al, MethodCore method, MemberInfo this_builder)
2613 {
2614 EntryType tested_type = (method is Constructor ? EntryType.Constructor : EntryType.Method) | EntryType.Public;
2615
2616 for (int i = 0; i < al.Count; ++i) {
2617 MemberCache.CacheEntry entry = (MemberCache.CacheEntry) al [i];
2618
2619 // skip itself
2620 if (entry.Member == this_builder)
2621 continue;
2622
2623 if ((entry.EntryType & tested_type) != tested_type)
2624 continue;
2625
2626 MethodBase method_to_compare = (MethodBase)entry.Member;
2627 AttributeTester.Result result = AttributeTester.AreOverloadedMethodParamsClsCompliant (
2628 method.Parameters, TypeManager.GetParameterData (method_to_compare));
2629
2630 if (result == AttributeTester.Result.Ok)
2631 continue;
2632
2633 IMethodData md = TypeManager.GetMethod (method_to_compare);
2634
2635 // TODO: now we are ignoring CLSCompliance(false) on method from other assembly which is buggy.
2636 // However it is exactly what csc does.
2637 if (md != null && !md.IsClsComplianceRequired ())
2638 continue;
2639
2640 Report.SymbolRelatedToPreviousError (entry.Member);
2641 switch (result) {
2642 case AttributeTester.Result.RefOutArrayError:
2643 Report.Warning (3006, 1, method.Location,
2644 "Overloaded method `{0}' differing only in ref or out, or in array rank, is not CLS-compliant",
2645 method.GetSignatureForError ());
2646 continue;
2647 case AttributeTester.Result.ArrayArrayError:
2648 Report.Warning (3007, 1, method.Location,
2649 "Overloaded method `{0}' differing only by unnamed array types is not CLS-compliant",
2650 method.GetSignatureForError ());
2651 continue;
2652 }
2653
2654 throw new NotImplementedException (result.ToString ());
2655 }
2656 }
2657
2658 public bool CheckExistingMembersOverloads (MemberCore member, string name, ParametersCompiled parameters)
2659 {
2660 ArrayList entries = (ArrayList)member_hash [name];
2661 if (entries == null)
2662 return true;
2663
2664 int method_param_count = parameters.Count;
2665 for (int i = entries.Count - 1; i >= 0; --i) {
2666 CacheEntry ce = (CacheEntry) entries [i];
2667
2668 if (ce.Container != member.Parent.PartialContainer)
2669 return true;
2670
2671 Type [] p_types;
2672 AParametersCollection pd;
2673 if ((ce.EntryType & EntryType.Property) != 0) {
2674 pd = TypeManager.GetParameterData ((PropertyInfo) ce.Member);
2675 p_types = pd.Types;
2676 } else {
2677 MethodBase mb = (MethodBase) ce.Member;
2678
2679 // TODO: This is more like a hack, because we are adding generic methods
2680 // twice with and without arity name
2681 if (TypeManager.IsGenericMethod (mb) && !member.MemberName.IsGeneric)
2682 continue;
2683
2684 pd = TypeManager.GetParameterData (mb);
2685 p_types = pd.Types;
2686 }
2687
2688 if (p_types.Length != method_param_count)
2689 continue;
2690
2691 if (method_param_count > 0) {
2692 int ii = method_param_count - 1;
2693 Type type_a, type_b;
2694 do {
2695 type_a = parameters.Types [ii];
2696 type_b = p_types [ii];
2697
2698 #if GMCS_SOURCE
2699 if (TypeManager.IsGenericParameter (type_a) && type_a.DeclaringMethod != null)
2700 type_a = typeof (TypeParameter);
2701
2702 if (TypeManager.IsGenericParameter (type_b) && type_b.DeclaringMethod != null)
2703 type_b = typeof (TypeParameter);
2704 #endif
2705 if ((pd.FixedParameters [ii].ModFlags & Parameter.Modifier.ISBYREF) !=
2706 (parameters.FixedParameters [ii].ModFlags & Parameter.Modifier.ISBYREF))
2707 type_a = null;
2708
2709 } while (type_a == type_b && ii-- != 0);
2710
2711 if (ii >= 0)
2712 continue;
2713
2714 //
2715 // Operators can differ in return type only
2716 //
2717 if (member is Operator) {
2718 Operator op = TypeManager.GetMethod ((MethodBase) ce.Member) as Operator;
2719 if (op != null && op.ReturnType != ((Operator) member).ReturnType)
2720 continue;
2721 }
2722
2723 //
2724 // Report difference in parameter modifiers only
2725 //
2726 if (pd != null && member is MethodCore) {
2727 ii = method_param_count;
2728 while (ii-- != 0 && parameters.FixedParameters [ii].ModFlags == pd.FixedParameters [ii].ModFlags &&
2729 parameters.ExtensionMethodType == pd.ExtensionMethodType);
2730
2731 if (ii >= 0) {
2732 MethodCore mc = TypeManager.GetMethod ((MethodBase) ce.Member) as MethodCore;
2733 Report.SymbolRelatedToPreviousError (ce.Member);
2734 if ((member.ModFlags & Modifiers.PARTIAL) != 0 && (mc.ModFlags & Modifiers.PARTIAL) != 0) {
2735 if (parameters.HasParams || pd.HasParams) {
2736 Report.Error (758, member.Location,
2737 "A partial method declaration and partial method implementation cannot differ on use of `params' modifier");
2738 } else {
2739 Report.Error (755, member.Location,
2740 "A partial method declaration and partial method implementation must be both an extension method or neither");
2741 }
2742 } else {
2743 if (member is Constructor) {
2744 Report.Error (851, member.Location,
2745 "Overloaded contructor `{0}' cannot differ on use of parameter modifiers only",
2746 member.GetSignatureForError ());
2747 } else {
2748 Report.Error (663, member.Location,
2749 "Overloaded method `{0}' cannot differ on use of parameter modifiers only",
2750 member.GetSignatureForError ());
2751 }
2752 }
2753 return false;
2754 }
2755 }
2756 }
2757
2758 if ((ce.EntryType & EntryType.Method) != 0) {
2759 Method method_a = member as Method;
2760 Method method_b = TypeManager.GetMethod ((MethodBase) ce.Member) as Method;
2761 if (method_a != null && method_b != null && (method_a.ModFlags & method_b.ModFlags & Modifiers.PARTIAL) != 0) {
2762 const int partial_modifiers = Modifiers.STATIC | Modifiers.UNSAFE;
2763 if (method_a.IsPartialDefinition == method_b.IsPartialImplementation) {
2764 if ((method_a.ModFlags & partial_modifiers) == (method_b.ModFlags & partial_modifiers) ||
2765 method_a.Parent.IsInUnsafeScope && method_b.Parent.IsInUnsafeScope) {
2766 if (method_a.IsPartialImplementation) {
2767 method_a.SetPartialDefinition (method_b);
2768 entries.RemoveAt (i);
2769 } else {
2770 method_b.SetPartialDefinition (method_a);
2771 }
2772 continue;
2773 }
2774
2775 if ((method_a.ModFlags & Modifiers.STATIC) != (method_b.ModFlags & Modifiers.STATIC)) {
2776 Report.SymbolRelatedToPreviousError (ce.Member);
2777 Report.Error (763, member.Location,
2778 "A partial method declaration and partial method implementation must be both `static' or neither");
2779 }
2780
2781 Report.SymbolRelatedToPreviousError (ce.Member);
2782 Report.Error (764, member.Location,
2783 "A partial method declaration and partial method implementation must be both `unsafe' or neither");
2784 return false;
2785 }
2786
2787 Report.SymbolRelatedToPreviousError (ce.Member);
2788 if (method_a.IsPartialDefinition) {
2789 Report.Error (756, member.Location, "A partial method `{0}' declaration is already defined",
2790 member.GetSignatureForError ());
2791 }
2792
2793 Report.Error (757, member.Location, "A partial method `{0}' implementation is already defined",
2794 member.GetSignatureForError ());
2795 return false;
2796 }
2797
2798 Report.SymbolRelatedToPreviousError (ce.Member);
2799 IMethodData duplicate_member = TypeManager.GetMethod ((MethodBase) ce.Member);
2800 if (member is Operator && duplicate_member is Operator) {
2801 Report.Error (557, member.Location, "Duplicate user-defined conversion in type `{0}'",
2802 member.Parent.GetSignatureForError ());
2803 return false;
2804 }
2805
2806 bool is_reserved_a = member is AbstractPropertyEventMethod || member is Operator;
2807 bool is_reserved_b = duplicate_member is AbstractPropertyEventMethod || duplicate_member is Operator;
2808
2809 if (is_reserved_a || is_reserved_b) {
2810 Report.Error (82, member.Location, "A member `{0}' is already reserved",
2811 is_reserved_a ?
2812 TypeManager.GetFullNameSignature (ce.Member) :
2813 member.GetSignatureForError ());
2814 return false;
2815 }
2816 } else {
2817 Report.SymbolRelatedToPreviousError (ce.Member);
2818 }
2819
2820 Report.Error (111, member.Location,
2821 "A member `{0}' is already defined. Rename this member or use different parameter types",
2822 member.GetSignatureForError ());
2823 return false;
2824 }
2825
2826 return true;
2827 }
2828 }
2829 }
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