1//===-- DeclBase.h - Base Classes for representing declarations -*- C++ -*-===//
2//
3// The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file defines the Decl and DeclContext interfaces.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef LLVM_CLANG_AST_DECLBASE_H
15#define LLVM_CLANG_AST_DECLBASE_H
16
17#include "clang/AST/AttrIterator.h"
18#include "clang/AST/DeclarationName.h"
19#include "clang/Basic/Specifiers.h"
20#include "clang/Basic/VersionTuple.h"
21#include "llvm/ADT/PointerUnion.h"
22#include "llvm/ADT/iterator.h"
23#include "llvm/ADT/iterator_range.h"
24#include "llvm/Support/Compiler.h"
25#include "llvm/Support/PrettyStackTrace.h"
26
27namespace clang {
28class ASTMutationListener;
29class BlockDecl;
30class CXXRecordDecl;
31class CompoundStmt;
32class DeclContext;
33class DeclarationName;
34class DependentDiagnostic;
35class EnumDecl;
36class ExportDecl;
37class ExternalSourceSymbolAttr;
38class FunctionDecl;
39class FunctionType;
40enum Linkage : unsigned char;
41class LinkageComputer;
42class LinkageSpecDecl;
43class Module;
44class NamedDecl;
45class NamespaceDecl;
46class ObjCCategoryDecl;
47class ObjCCategoryImplDecl;
48class ObjCContainerDecl;
49class ObjCImplDecl;
50class ObjCImplementationDecl;
51class ObjCInterfaceDecl;
52class ObjCMethodDecl;
53class ObjCProtocolDecl;
54struct PrintingPolicy;
55class RecordDecl;
56class Stmt;
57class StoredDeclsMap;
58class TemplateDecl;
59class TranslationUnitDecl;
60class UsingDirectiveDecl;
61}
62
63namespace clang {
64
65 /// \brief Captures the result of checking the availability of a
66 /// declaration.
67 enum AvailabilityResult {
68 AR_Available = 0,
69 AR_NotYetIntroduced,
70 AR_Deprecated,
71 AR_Unavailable
72 };
73
74/// Decl - This represents one declaration (or definition), e.g. a variable,
75/// typedef, function, struct, etc.
76///
77/// Note: There are objects tacked on before the *beginning* of Decl
78/// (and its subclasses) in its Decl::operator new(). Proper alignment
79/// of all subclasses (not requiring more than the alignment of Decl) is
80/// asserted in DeclBase.cpp.
81class LLVM_ALIGNAS(/*alignof(uint64_t)*/ 8) Decl {
82public:
83 /// \brief Lists the kind of concrete classes of Decl.
84 enum Kind {
85#define DECL(DERIVED, BASE) DERIVED,
86#define ABSTRACT_DECL(DECL)
87#define DECL_RANGE(BASE, START, END) \
88 first##BASE = START, last##BASE = END,
89#define LAST_DECL_RANGE(BASE, START, END) \
90 first##BASE = START, last##BASE = END
91#include "clang/AST/DeclNodes.inc"
92 };
93
94 /// \brief A placeholder type used to construct an empty shell of a
95 /// decl-derived type that will be filled in later (e.g., by some
96 /// deserialization method).
97 struct EmptyShell { };
98
99 /// IdentifierNamespace - The different namespaces in which
100 /// declarations may appear. According to C99 6.2.3, there are
101 /// four namespaces, labels, tags, members and ordinary
102 /// identifiers. C++ describes lookup completely differently:
103 /// certain lookups merely "ignore" certain kinds of declarations,
104 /// usually based on whether the declaration is of a type, etc.
105 ///
106 /// These are meant as bitmasks, so that searches in
107 /// C++ can look into the "tag" namespace during ordinary lookup.
108 ///
109 /// Decl currently provides 15 bits of IDNS bits.
110 enum IdentifierNamespace {
111 /// Labels, declared with 'x:' and referenced with 'goto x'.
112 IDNS_Label = 0x0001,
113
114 /// Tags, declared with 'struct foo;' and referenced with
115 /// 'struct foo'. All tags are also types. This is what
116 /// elaborated-type-specifiers look for in C.
117 /// This also contains names that conflict with tags in the
118 /// same scope but that are otherwise ordinary names (non-type
119 /// template parameters and indirect field declarations).
120 IDNS_Tag = 0x0002,
121
122 /// Types, declared with 'struct foo', typedefs, etc.
123 /// This is what elaborated-type-specifiers look for in C++,
124 /// but note that it's ill-formed to find a non-tag.
125 IDNS_Type = 0x0004,
126
127 /// Members, declared with object declarations within tag
128 /// definitions. In C, these can only be found by "qualified"
129 /// lookup in member expressions. In C++, they're found by
130 /// normal lookup.
131 IDNS_Member = 0x0008,
132
133 /// Namespaces, declared with 'namespace foo {}'.
134 /// Lookup for nested-name-specifiers find these.
135 IDNS_Namespace = 0x0010,
136
137 /// Ordinary names. In C, everything that's not a label, tag,
138 /// member, or function-local extern ends up here.
139 IDNS_Ordinary = 0x0020,
140
141 /// Objective C \@protocol.
142 IDNS_ObjCProtocol = 0x0040,
143
144 /// This declaration is a friend function. A friend function
145 /// declaration is always in this namespace but may also be in
146 /// IDNS_Ordinary if it was previously declared.
147 IDNS_OrdinaryFriend = 0x0080,
148
149 /// This declaration is a friend class. A friend class
150 /// declaration is always in this namespace but may also be in
151 /// IDNS_Tag|IDNS_Type if it was previously declared.
152 IDNS_TagFriend = 0x0100,
153
154 /// This declaration is a using declaration. A using declaration
155 /// *introduces* a number of other declarations into the current
156 /// scope, and those declarations use the IDNS of their targets,
157 /// but the actual using declarations go in this namespace.
158 IDNS_Using = 0x0200,
159
160 /// This declaration is a C++ operator declared in a non-class
161 /// context. All such operators are also in IDNS_Ordinary.
162 /// C++ lexical operator lookup looks for these.
163 IDNS_NonMemberOperator = 0x0400,
164
165 /// This declaration is a function-local extern declaration of a
166 /// variable or function. This may also be IDNS_Ordinary if it
167 /// has been declared outside any function. These act mostly like
168 /// invisible friend declarations, but are also visible to unqualified
169 /// lookup within the scope of the declaring function.
170 IDNS_LocalExtern = 0x0800,
171
172 /// This declaration is an OpenMP user defined reduction construction.
173 IDNS_OMPReduction = 0x1000
174 };
175
176 /// ObjCDeclQualifier - 'Qualifiers' written next to the return and
177 /// parameter types in method declarations. Other than remembering
178 /// them and mangling them into the method's signature string, these
179 /// are ignored by the compiler; they are consumed by certain
180 /// remote-messaging frameworks.
181 ///
182 /// in, inout, and out are mutually exclusive and apply only to
183 /// method parameters. bycopy and byref are mutually exclusive and
184 /// apply only to method parameters (?). oneway applies only to
185 /// results. All of these expect their corresponding parameter to
186 /// have a particular type. None of this is currently enforced by
187 /// clang.
188 ///
189 /// This should be kept in sync with ObjCDeclSpec::ObjCDeclQualifier.
190 enum ObjCDeclQualifier {
191 OBJC_TQ_None = 0x0,
192 OBJC_TQ_In = 0x1,
193 OBJC_TQ_Inout = 0x2,
194 OBJC_TQ_Out = 0x4,
195 OBJC_TQ_Bycopy = 0x8,
196 OBJC_TQ_Byref = 0x10,
197 OBJC_TQ_Oneway = 0x20,
198
199 /// The nullability qualifier is set when the nullability of the
200 /// result or parameter was expressed via a context-sensitive
201 /// keyword.
202 OBJC_TQ_CSNullability = 0x40
203 };
204
205protected:
206 // Enumeration values used in the bits stored in NextInContextAndBits.
207 enum {
208 /// \brief Whether this declaration is a top-level declaration (function,
209 /// global variable, etc.) that is lexically inside an objc container
210 /// definition.
211 TopLevelDeclInObjCContainerFlag = 0x01,
212
213 /// \brief Whether this declaration is private to the module in which it was
214 /// defined.
215 ModulePrivateFlag = 0x02
216 };
217
218 /// \brief The next declaration within the same lexical
219 /// DeclContext. These pointers form the linked list that is
220 /// traversed via DeclContext's decls_begin()/decls_end().
221 ///
222 /// The extra two bits are used for the TopLevelDeclInObjCContainer and
223 /// ModulePrivate bits.
224 llvm::PointerIntPair<Decl *, 2, unsigned> NextInContextAndBits;
225
226private:
227 friend class DeclContext;
228
229 struct MultipleDC {
230 DeclContext *SemanticDC;
231 DeclContext *LexicalDC;
232 };
233
234
235 /// DeclCtx - Holds either a DeclContext* or a MultipleDC*.
236 /// For declarations that don't contain C++ scope specifiers, it contains
237 /// the DeclContext where the Decl was declared.
238 /// For declarations with C++ scope specifiers, it contains a MultipleDC*
239 /// with the context where it semantically belongs (SemanticDC) and the
240 /// context where it was lexically declared (LexicalDC).
241 /// e.g.:
242 ///
243 /// namespace A {
244 /// void f(); // SemanticDC == LexicalDC == 'namespace A'
245 /// }
246 /// void A::f(); // SemanticDC == namespace 'A'
247 /// // LexicalDC == global namespace
248 llvm::PointerUnion<DeclContext*, MultipleDC*> DeclCtx;
249
250 inline bool isInSemaDC() const { return DeclCtx.is<DeclContext*>(); }
251 inline bool isOutOfSemaDC() const { return DeclCtx.is<MultipleDC*>(); }
252 inline MultipleDC *getMultipleDC() const {
253 return DeclCtx.get<MultipleDC*>();
254 }
255 inline DeclContext *getSemanticDC() const {
256 return DeclCtx.get<DeclContext*>();
257 }
258
259 /// Loc - The location of this decl.
260 SourceLocation Loc;
261
262 /// DeclKind - This indicates which class this is.
263 unsigned DeclKind : 7;
264
265 /// InvalidDecl - This indicates a semantic error occurred.
266 unsigned InvalidDecl : 1;
267
268 /// HasAttrs - This indicates whether the decl has attributes or not.
269 unsigned HasAttrs : 1;
270
271 /// Implicit - Whether this declaration was implicitly generated by
272 /// the implementation rather than explicitly written by the user.
273 unsigned Implicit : 1;
274
275 /// \brief Whether this declaration was "used", meaning that a definition is
276 /// required.
277 unsigned Used : 1;
278
279 /// \brief Whether this declaration was "referenced".
280 /// The difference with 'Used' is whether the reference appears in a
281 /// evaluated context or not, e.g. functions used in uninstantiated templates
282 /// are regarded as "referenced" but not "used".
283 unsigned Referenced : 1;
284
285 /// \brief Whether statistic collection is enabled.
286 static bool StatisticsEnabled;
287
288protected:
289 /// Access - Used by C++ decls for the access specifier.
290 // NOTE: VC++ treats enums as signed, avoid using the AccessSpecifier enum
291 unsigned Access : 2;
292 friend class CXXClassMemberWrapper;
293
294 /// \brief Whether this declaration was loaded from an AST file.
295 unsigned FromASTFile : 1;
296
297 /// \brief Whether this declaration is hidden from normal name lookup, e.g.,
298 /// because it is was loaded from an AST file is either module-private or
299 /// because its submodule has not been made visible.
300 unsigned Hidden : 1;
301
302 /// IdentifierNamespace - This specifies what IDNS_* namespace this lives in.
303 unsigned IdentifierNamespace : 13;
304
305 /// \brief If 0, we have not computed the linkage of this declaration.
306 /// Otherwise, it is the linkage + 1.
307 mutable unsigned CacheValidAndLinkage : 3;
308
309 friend class ASTDeclWriter;
310 friend class ASTDeclReader;
311 friend class ASTReader;
312 friend class LinkageComputer;
313
314 template<typename decl_type> friend class Redeclarable;
315
316 /// \brief Allocate memory for a deserialized declaration.
317 ///
318 /// This routine must be used to allocate memory for any declaration that is
319 /// deserialized from a module file.
320 ///
321 /// \param Size The size of the allocated object.
322 /// \param Ctx The context in which we will allocate memory.
323 /// \param ID The global ID of the deserialized declaration.
324 /// \param Extra The amount of extra space to allocate after the object.
325 void *operator new(std::size_t Size, const ASTContext &Ctx, unsigned ID,
326 std::size_t Extra = 0);
327
328 /// \brief Allocate memory for a non-deserialized declaration.
329 void *operator new(std::size_t Size, const ASTContext &Ctx,
330 DeclContext *Parent, std::size_t Extra = 0);
331
332private:
333 bool AccessDeclContextSanity() const;
334
335protected:
336 Decl(Kind DK, DeclContext *DC, SourceLocation L)
337 : NextInContextAndBits(), DeclCtx(DC), Loc(L), DeclKind(DK),
338 InvalidDecl(0), HasAttrs(false), Implicit(false), Used(false),
339 Referenced(false), Access(AS_none), FromASTFile(0),
340 Hidden(DC && cast<Decl>(DC)->Hidden &&
341 (!cast<Decl>(DC)->isFromASTFile() ||
342 hasLocalOwningModuleStorage())),
343 IdentifierNamespace(getIdentifierNamespaceForKind(DK)),
344 CacheValidAndLinkage(0) {
345 if (StatisticsEnabled) add(DK);
346 }
347
348 Decl(Kind DK, EmptyShell Empty)
349 : NextInContextAndBits(), DeclKind(DK), InvalidDecl(0),
350 HasAttrs(false), Implicit(false), Used(false), Referenced(false),
351 Access(AS_none), FromASTFile(0), Hidden(0),
352 IdentifierNamespace(getIdentifierNamespaceForKind(DK)),
353 CacheValidAndLinkage(0)
354 {
355 if (StatisticsEnabled) add(DK);
356 }
357
358 virtual ~Decl();
359
360 /// \brief Update a potentially out-of-date declaration.
361 void updateOutOfDate(IdentifierInfo &II) const;
362
363 Linkage getCachedLinkage() const {
364 return Linkage(CacheValidAndLinkage - 1);
365 }
366
367 void setCachedLinkage(Linkage L) const {
368 CacheValidAndLinkage = L + 1;
369 }
370
371 bool hasCachedLinkage() const {
372 return CacheValidAndLinkage;
373 }
374
375public:
376
377 /// \brief Source range that this declaration covers.
378 virtual SourceRange getSourceRange() const LLVM_READONLY {
379 return SourceRange(getLocation(), getLocation());
380 }
381 SourceLocation getLocStart() const LLVM_READONLY {
382 return getSourceRange().getBegin();
383 }
384 SourceLocation getLocEnd() const LLVM_READONLY {
385 return getSourceRange().getEnd();
386 }
387
388 SourceLocation getLocation() const { return Loc; }
389 void setLocation(SourceLocation L) { Loc = L; }
390
391 Kind getKind() const { return static_cast<Kind>(DeclKind); }
392 const char *getDeclKindName() const;
393
394 Decl *getNextDeclInContext() { return NextInContextAndBits.getPointer(); }
395 const Decl *getNextDeclInContext() const {return NextInContextAndBits.getPointer();}
396
397 DeclContext *getDeclContext() {
398 if (isInSemaDC())
399 return getSemanticDC();
400 return getMultipleDC()->SemanticDC;
401 }
402 const DeclContext *getDeclContext() const {
403 return const_cast<Decl*>(this)->getDeclContext();
404 }
405
406 /// Find the innermost non-closure ancestor of this declaration,
407 /// walking up through blocks, lambdas, etc. If that ancestor is
408 /// not a code context (!isFunctionOrMethod()), returns null.
409 ///
410 /// A declaration may be its own non-closure context.
411 Decl *getNonClosureContext();
412 const Decl *getNonClosureContext() const {
413 return const_cast<Decl*>(this)->getNonClosureContext();
414 }
415
416 TranslationUnitDecl *getTranslationUnitDecl();
417 const TranslationUnitDecl *getTranslationUnitDecl() const {
418 return const_cast<Decl*>(this)->getTranslationUnitDecl();
419 }
420
421 bool isInAnonymousNamespace() const;
422
423 bool isInStdNamespace() const;
424
425 ASTContext &getASTContext() const LLVM_READONLY;
426
427 void setAccess(AccessSpecifier AS) {
428 Access = AS;
429 assert(AccessDeclContextSanity());
430 }
431
432 AccessSpecifier getAccess() const {
433 assert(AccessDeclContextSanity());
434 return AccessSpecifier(Access);
435 }
436
437 /// \brief Retrieve the access specifier for this declaration, even though
438 /// it may not yet have been properly set.
439 AccessSpecifier getAccessUnsafe() const {
440 return AccessSpecifier(Access);
441 }
442
443 bool hasAttrs() const { return HasAttrs; }
444 void setAttrs(const AttrVec& Attrs) {
445 return setAttrsImpl(Attrs, getASTContext());
446 }
447 AttrVec &getAttrs() {
448 return const_cast<AttrVec&>(const_cast<const Decl*>(this)->getAttrs());
449 }
450 const AttrVec &getAttrs() const;
451 void dropAttrs();
452
453 void addAttr(Attr *A) {
454 if (hasAttrs())
455 getAttrs().push_back(A);
456 else
457 setAttrs(AttrVec(1, A));
458 }
459
460 typedef AttrVec::const_iterator attr_iterator;
461 typedef llvm::iterator_range<attr_iterator> attr_range;
462
463 attr_range attrs() const {
464 return attr_range(attr_begin(), attr_end());
465 }
466
467 attr_iterator attr_begin() const {
468 return hasAttrs() ? getAttrs().begin() : nullptr;
469 }
470 attr_iterator attr_end() const {
471 return hasAttrs() ? getAttrs().end() : nullptr;
472 }
473
474 template <typename T>
475 void dropAttr() {
476 if (!HasAttrs) return;
477
478 AttrVec &Vec = getAttrs();
479 Vec.erase(std::remove_if(Vec.begin(), Vec.end(), isa<T, Attr*>), Vec.end());
480
481 if (Vec.empty())
482 HasAttrs = false;
483 }
484
485 template <typename T>
486 llvm::iterator_range<specific_attr_iterator<T>> specific_attrs() const {
487 return llvm::make_range(specific_attr_begin<T>(), specific_attr_end<T>());
488 }
489
490 template <typename T>
491 specific_attr_iterator<T> specific_attr_begin() const {
492 return specific_attr_iterator<T>(attr_begin());
493 }
494 template <typename T>
495 specific_attr_iterator<T> specific_attr_end() const {
496 return specific_attr_iterator<T>(attr_end());
497 }
498
499 template<typename T> T *getAttr() const {
500 return hasAttrs() ? getSpecificAttr<T>(getAttrs()) : nullptr;
501 }
502 template<typename T> bool hasAttr() const {
503 return hasAttrs() && hasSpecificAttr<T>(getAttrs());
504 }
505
506 /// getMaxAlignment - return the maximum alignment specified by attributes
507 /// on this decl, 0 if there are none.
508 unsigned getMaxAlignment() const;
509
510 /// setInvalidDecl - Indicates the Decl had a semantic error. This
511 /// allows for graceful error recovery.
512 void setInvalidDecl(bool Invalid = true);
513 bool isInvalidDecl() const { return (bool) InvalidDecl; }
514
515 /// isImplicit - Indicates whether the declaration was implicitly
516 /// generated by the implementation. If false, this declaration
517 /// was written explicitly in the source code.
518 bool isImplicit() const { return Implicit; }
519 void setImplicit(bool I = true) { Implicit = I; }
520
521 /// \brief Whether *any* (re-)declaration of the entity was used, meaning that
522 /// a definition is required.
523 ///
524 /// \param CheckUsedAttr When true, also consider the "used" attribute
525 /// (in addition to the "used" bit set by \c setUsed()) when determining
526 /// whether the function is used.
527 bool isUsed(bool CheckUsedAttr = true) const;
528
529 /// \brief Set whether the declaration is used, in the sense of odr-use.
530 ///
531 /// This should only be used immediately after creating a declaration.
532 /// It intentionally doesn't notify any listeners.
533 void setIsUsed() { getCanonicalDecl()->Used = true; }
534
535 /// \brief Mark the declaration used, in the sense of odr-use.
536 ///
537 /// This notifies any mutation listeners in addition to setting a bit
538 /// indicating the declaration is used.
539 void markUsed(ASTContext &C);
540
541 /// \brief Whether any declaration of this entity was referenced.
542 bool isReferenced() const;
543
544 /// \brief Whether this declaration was referenced. This should not be relied
545 /// upon for anything other than debugging.
546 bool isThisDeclarationReferenced() const { return Referenced; }
547
548 void setReferenced(bool R = true) { Referenced = R; }
549
550 /// \brief Whether this declaration is a top-level declaration (function,
551 /// global variable, etc.) that is lexically inside an objc container
552 /// definition.
553 bool isTopLevelDeclInObjCContainer() const {
554 return NextInContextAndBits.getInt() & TopLevelDeclInObjCContainerFlag;
555 }
556
557 void setTopLevelDeclInObjCContainer(bool V = true) {
558 unsigned Bits = NextInContextAndBits.getInt();
559 if (V)
560 Bits |= TopLevelDeclInObjCContainerFlag;
561 else
562 Bits &= ~TopLevelDeclInObjCContainerFlag;
563 NextInContextAndBits.setInt(Bits);
564 }
565
566 /// \brief Looks on this and related declarations for an applicable
567 /// external source symbol attribute.
568 ExternalSourceSymbolAttr *getExternalSourceSymbolAttr() const;
569
570 /// \brief Whether this declaration was marked as being private to the
571 /// module in which it was defined.
572 bool isModulePrivate() const {
573 return NextInContextAndBits.getInt() & ModulePrivateFlag;
574 }
575
576 /// \brief Whether this declaration is exported (by virtue of being lexically
577 /// within an ExportDecl or by being a NamespaceDecl).
578 bool isExported() const;
579
580 /// Return true if this declaration has an attribute which acts as
581 /// definition of the entity, such as 'alias' or 'ifunc'.
582 bool hasDefiningAttr() const;
583
584 /// Return this declaration's defining attribute if it has one.
585 const Attr *getDefiningAttr() const;
586
587protected:
588 /// \brief Specify whether this declaration was marked as being private
589 /// to the module in which it was defined.
590 void setModulePrivate(bool MP = true) {
591 unsigned Bits = NextInContextAndBits.getInt();
592 if (MP)
593 Bits |= ModulePrivateFlag;
594 else
595 Bits &= ~ModulePrivateFlag;
596 NextInContextAndBits.setInt(Bits);
597 }
598
599 /// \brief Set the owning module ID.
600 void setOwningModuleID(unsigned ID) {
601 assert(isFromASTFile() && "Only works on a deserialized declaration");
602 *((unsigned*)this - 2) = ID;
603 }
604
605public:
606
607 /// \brief Determine the availability of the given declaration.
608 ///
609 /// This routine will determine the most restrictive availability of
610 /// the given declaration (e.g., preferring 'unavailable' to
611 /// 'deprecated').
612 ///
613 /// \param Message If non-NULL and the result is not \c
614 /// AR_Available, will be set to a (possibly empty) message
615 /// describing why the declaration has not been introduced, is
616 /// deprecated, or is unavailable.
617 ///
618 /// \param EnclosingVersion The version to compare with. If empty, assume the
619 /// deployment target version.
620 AvailabilityResult
621 getAvailability(std::string *Message = nullptr,
622 VersionTuple EnclosingVersion = VersionTuple()) const;
623
624 /// \brief Retrieve the version of the target platform in which this
625 /// declaration was introduced.
626 ///
627 /// \returns An empty version tuple if this declaration has no 'introduced'
628 /// availability attributes, or the version tuple that's specified in the
629 /// attribute otherwise.
630 VersionTuple getVersionIntroduced() const;
631
632 /// \brief Determine whether this declaration is marked 'deprecated'.
633 ///
634 /// \param Message If non-NULL and the declaration is deprecated,
635 /// this will be set to the message describing why the declaration
636 /// was deprecated (which may be empty).
637 bool isDeprecated(std::string *Message = nullptr) const {
638 return getAvailability(Message) == AR_Deprecated;
639 }
640
641 /// \brief Determine whether this declaration is marked 'unavailable'.
642 ///
643 /// \param Message If non-NULL and the declaration is unavailable,
644 /// this will be set to the message describing why the declaration
645 /// was made unavailable (which may be empty).
646 bool isUnavailable(std::string *Message = nullptr) const {
647 return getAvailability(Message) == AR_Unavailable;
648 }
649
650 /// \brief Determine whether this is a weak-imported symbol.
651 ///
652 /// Weak-imported symbols are typically marked with the
653 /// 'weak_import' attribute, but may also be marked with an
654 /// 'availability' attribute where we're targing a platform prior to
655 /// the introduction of this feature.
656 bool isWeakImported() const;
657
658 /// \brief Determines whether this symbol can be weak-imported,
659 /// e.g., whether it would be well-formed to add the weak_import
660 /// attribute.
661 ///
662 /// \param IsDefinition Set to \c true to indicate that this
663 /// declaration cannot be weak-imported because it has a definition.
664 bool canBeWeakImported(bool &IsDefinition) const;
665
666 /// \brief Determine whether this declaration came from an AST file (such as
667 /// a precompiled header or module) rather than having been parsed.
668 bool isFromASTFile() const { return FromASTFile; }
669
670 /// \brief Retrieve the global declaration ID associated with this
671 /// declaration, which specifies where this Decl was loaded from.
672 unsigned getGlobalID() const {
673 if (isFromASTFile())
674 return *((const unsigned*)this - 1);
675 return 0;
676 }
677
678 /// \brief Retrieve the global ID of the module that owns this particular
679 /// declaration.
680 unsigned getOwningModuleID() const {
681 if (isFromASTFile())
682 return *((const unsigned*)this - 2);
683 return 0;
684 }
685
686private:
687 Module *getOwningModuleSlow() const;
688protected:
689 bool hasLocalOwningModuleStorage() const;
690
691public:
692 /// \brief Get the imported owning module, if this decl is from an imported
693 /// (non-local) module.
694 Module *getImportedOwningModule() const {
695 if (!isFromASTFile())
696 return nullptr;
697
698 return getOwningModuleSlow();
699 }
700
701 /// \brief Get the local owning module, if known. Returns nullptr if owner is
702 /// not yet known or declaration is not from a module.
703 Module *getLocalOwningModule() const {
704 if (isFromASTFile() || !Hidden)
705 return nullptr;
706
707 assert(hasLocalOwningModuleStorage() &&
708 "hidden local decl but no local module storage");
709 return reinterpret_cast<Module *const *>(this)[-1];
710 }
711 void setLocalOwningModule(Module *M) {
712 assert(!isFromASTFile() && Hidden && hasLocalOwningModuleStorage() &&
713 "should not have a cached owning module");
714 reinterpret_cast<Module **>(this)[-1] = M;
715 }
716
717 Module *getOwningModule() const {
718 return isFromASTFile() ? getImportedOwningModule() : getLocalOwningModule();
719 }
720
721 /// \brief Determine whether this declaration is hidden from name lookup.
722 bool isHidden() const { return Hidden; }
723
724 /// \brief Set whether this declaration is hidden from name lookup.
725 void setHidden(bool Hide) {
726 assert((!Hide || isFromASTFile() || hasLocalOwningModuleStorage()) &&
727 "declaration with no owning module can't be hidden");
728 Hidden = Hide;
729 }
730
731 unsigned getIdentifierNamespace() const {
732 return IdentifierNamespace;
733 }
734 bool isInIdentifierNamespace(unsigned NS) const {
735 return getIdentifierNamespace() & NS;
736 }
737 static unsigned getIdentifierNamespaceForKind(Kind DK);
738
739 bool hasTagIdentifierNamespace() const {
740 return isTagIdentifierNamespace(getIdentifierNamespace());
741 }
742 static bool isTagIdentifierNamespace(unsigned NS) {
743 // TagDecls have Tag and Type set and may also have TagFriend.
744 return (NS & ~IDNS_TagFriend) == (IDNS_Tag | IDNS_Type);
745 }
746
747 /// getLexicalDeclContext - The declaration context where this Decl was
748 /// lexically declared (LexicalDC). May be different from
749 /// getDeclContext() (SemanticDC).
750 /// e.g.:
751 ///
752 /// namespace A {
753 /// void f(); // SemanticDC == LexicalDC == 'namespace A'
754 /// }
755 /// void A::f(); // SemanticDC == namespace 'A'
756 /// // LexicalDC == global namespace
757 DeclContext *getLexicalDeclContext() {
758 if (isInSemaDC())
759 return getSemanticDC();
760 return getMultipleDC()->LexicalDC;
761 }
762 const DeclContext *getLexicalDeclContext() const {
763 return const_cast<Decl*>(this)->getLexicalDeclContext();
764 }
765
766 /// Determine whether this declaration is declared out of line (outside its
767 /// semantic context).
768 virtual bool isOutOfLine() const;
769
770 /// setDeclContext - Set both the semantic and lexical DeclContext
771 /// to DC.
772 void setDeclContext(DeclContext *DC);
773
774 void setLexicalDeclContext(DeclContext *DC);
775
776 /// isDefinedOutsideFunctionOrMethod - This predicate returns true if this
777 /// scoped decl is defined outside the current function or method. This is
778 /// roughly global variables and functions, but also handles enums (which
779 /// could be defined inside or outside a function etc).
780 bool isDefinedOutsideFunctionOrMethod() const {
781 return getParentFunctionOrMethod() == nullptr;
782 }
783
784 /// \brief Returns true if this declaration lexically is inside a function.
785 /// It recognizes non-defining declarations as well as members of local
786 /// classes:
787 /// \code
788 /// void foo() { void bar(); }
789 /// void foo2() { class ABC { void bar(); }; }
790 /// \endcode
791 bool isLexicallyWithinFunctionOrMethod() const;
792
793 /// \brief If this decl is defined inside a function/method/block it returns
794 /// the corresponding DeclContext, otherwise it returns null.
795 const DeclContext *getParentFunctionOrMethod() const;
796 DeclContext *getParentFunctionOrMethod() {
797 return const_cast<DeclContext*>(
798 const_cast<const Decl*>(this)->getParentFunctionOrMethod());
799 }
800
801 /// \brief Retrieves the "canonical" declaration of the given declaration.
802 virtual Decl *getCanonicalDecl() { return this; }
803 const Decl *getCanonicalDecl() const {
804 return const_cast<Decl*>(this)->getCanonicalDecl();
805 }
806
807 /// \brief Whether this particular Decl is a canonical one.
808 bool isCanonicalDecl() const { return getCanonicalDecl() == this; }
809
810protected:
811 /// \brief Returns the next redeclaration or itself if this is the only decl.
812 ///
813 /// Decl subclasses that can be redeclared should override this method so that
814 /// Decl::redecl_iterator can iterate over them.
815 virtual Decl *getNextRedeclarationImpl() { return this; }
816
817 /// \brief Implementation of getPreviousDecl(), to be overridden by any
818 /// subclass that has a redeclaration chain.
819 virtual Decl *getPreviousDeclImpl() { return nullptr; }
820
821 /// \brief Implementation of getMostRecentDecl(), to be overridden by any
822 /// subclass that has a redeclaration chain.
823 virtual Decl *getMostRecentDeclImpl() { return this; }
824
825public:
826 /// \brief Iterates through all the redeclarations of the same decl.
827 class redecl_iterator {
828 /// Current - The current declaration.
829 Decl *Current;
830 Decl *Starter;
831
832 public:
833 typedef Decl *value_type;
834 typedef const value_type &reference;
835 typedef const value_type *pointer;
836 typedef std::forward_iterator_tag iterator_category;
837 typedef std::ptrdiff_t difference_type;
838
839 redecl_iterator() : Current(nullptr) { }
840 explicit redecl_iterator(Decl *C) : Current(C), Starter(C) { }
841
842 reference operator*() const { return Current; }
843 value_type operator->() const { return Current; }
844
845 redecl_iterator& operator++() {
846 assert(Current && "Advancing while iterator has reached end");
847 // Get either previous decl or latest decl.
848 Decl *Next = Current->getNextRedeclarationImpl();
849 assert(Next && "Should return next redeclaration or itself, never null!");
850 Current = (Next != Starter) ? Next : nullptr;
851 return *this;
852 }
853
854 redecl_iterator operator++(int) {
855 redecl_iterator tmp(*this);
856 ++(*this);
857 return tmp;
858 }
859
860 friend bool operator==(redecl_iterator x, redecl_iterator y) {
861 return x.Current == y.Current;
862 }
863 friend bool operator!=(redecl_iterator x, redecl_iterator y) {
864 return x.Current != y.Current;
865 }
866 };
867
868 typedef llvm::iterator_range<redecl_iterator> redecl_range;
869
870 /// \brief Returns an iterator range for all the redeclarations of the same
871 /// decl. It will iterate at least once (when this decl is the only one).
872 redecl_range redecls() const {
873 return redecl_range(redecls_begin(), redecls_end());
874 }
875
876 redecl_iterator redecls_begin() const {
877 return redecl_iterator(const_cast<Decl *>(this));
878 }
879 redecl_iterator redecls_end() const { return redecl_iterator(); }
880
881 /// \brief Retrieve the previous declaration that declares the same entity
882 /// as this declaration, or NULL if there is no previous declaration.
883 Decl *getPreviousDecl() { return getPreviousDeclImpl(); }
884
885 /// \brief Retrieve the most recent declaration that declares the same entity
886 /// as this declaration, or NULL if there is no previous declaration.
887 const Decl *getPreviousDecl() const {
888 return const_cast<Decl *>(this)->getPreviousDeclImpl();
889 }
890
891 /// \brief True if this is the first declaration in its redeclaration chain.
892 bool isFirstDecl() const {
893 return getPreviousDecl() == nullptr;
894 }
895
896 /// \brief Retrieve the most recent declaration that declares the same entity
897 /// as this declaration (which may be this declaration).
898 Decl *getMostRecentDecl() { return getMostRecentDeclImpl(); }
899
900 /// \brief Retrieve the most recent declaration that declares the same entity
901 /// as this declaration (which may be this declaration).
902 const Decl *getMostRecentDecl() const {
903 return const_cast<Decl *>(this)->getMostRecentDeclImpl();
904 }
905
906 /// getBody - If this Decl represents a declaration for a body of code,
907 /// such as a function or method definition, this method returns the
908 /// top-level Stmt* of that body. Otherwise this method returns null.
909 virtual Stmt* getBody() const { return nullptr; }
910
911 /// \brief Returns true if this \c Decl represents a declaration for a body of
912 /// code, such as a function or method definition.
913 /// Note that \c hasBody can also return true if any redeclaration of this
914 /// \c Decl represents a declaration for a body of code.
915 virtual bool hasBody() const { return getBody() != nullptr; }
916
917 /// getBodyRBrace - Gets the right brace of the body, if a body exists.
918 /// This works whether the body is a CompoundStmt or a CXXTryStmt.
919 SourceLocation getBodyRBrace() const;
920
921 // global temp stats (until we have a per-module visitor)
922 static void add(Kind k);
923 static void EnableStatistics();
924 static void PrintStats();
925
926 /// isTemplateParameter - Determines whether this declaration is a
927 /// template parameter.
928 bool isTemplateParameter() const;
929
930 /// isTemplateParameter - Determines whether this declaration is a
931 /// template parameter pack.
932 bool isTemplateParameterPack() const;
933
934 /// \brief Whether this declaration is a parameter pack.
935 bool isParameterPack() const;
936
937 /// \brief returns true if this declaration is a template
938 bool isTemplateDecl() const;
939
940 /// \brief Whether this declaration is a function or function template.
941 bool isFunctionOrFunctionTemplate() const {
942 return (DeclKind >= Decl::firstFunction &&
943 DeclKind <= Decl::lastFunction) ||
944 DeclKind == FunctionTemplate;
945 }
946
947 /// \brief If this is a declaration that describes some template, this
948 /// method returns that template declaration.
949 TemplateDecl *getDescribedTemplate() const;
950
951 /// \brief Returns the function itself, or the templated function if this is a
952 /// function template.
953 FunctionDecl *getAsFunction() LLVM_READONLY;
954
955 const FunctionDecl *getAsFunction() const {
956 return const_cast<Decl *>(this)->getAsFunction();
957 }
958
959 /// \brief Changes the namespace of this declaration to reflect that it's
960 /// a function-local extern declaration.
961 ///
962 /// These declarations appear in the lexical context of the extern
963 /// declaration, but in the semantic context of the enclosing namespace
964 /// scope.
965 void setLocalExternDecl() {
966 assert((IdentifierNamespace == IDNS_Ordinary ||
967 IdentifierNamespace == IDNS_OrdinaryFriend) &&
968 "namespace is not ordinary");
969
970 Decl *Prev = getPreviousDecl();
971 IdentifierNamespace &= ~IDNS_Ordinary;
972
973 IdentifierNamespace |= IDNS_LocalExtern;
974 if (Prev && Prev->getIdentifierNamespace() & IDNS_Ordinary)
975 IdentifierNamespace |= IDNS_Ordinary;
976 }
977
978 /// \brief Determine whether this is a block-scope declaration with linkage.
979 /// This will either be a local variable declaration declared 'extern', or a
980 /// local function declaration.
981 bool isLocalExternDecl() {
982 return IdentifierNamespace & IDNS_LocalExtern;
983 }
984
985 /// \brief Changes the namespace of this declaration to reflect that it's
986 /// the object of a friend declaration.
987 ///
988 /// These declarations appear in the lexical context of the friending
989 /// class, but in the semantic context of the actual entity. This property
990 /// applies only to a specific decl object; other redeclarations of the
991 /// same entity may not (and probably don't) share this property.
992 void setObjectOfFriendDecl(bool PerformFriendInjection = false) {
993 unsigned OldNS = IdentifierNamespace;
994 assert((OldNS & (IDNS_Tag | IDNS_Ordinary |
995 IDNS_TagFriend | IDNS_OrdinaryFriend |
996 IDNS_LocalExtern)) &&
997 "namespace includes neither ordinary nor tag");
998 assert(!(OldNS & ~(IDNS_Tag | IDNS_Ordinary | IDNS_Type |
999 IDNS_TagFriend | IDNS_OrdinaryFriend |
1000 IDNS_LocalExtern)) &&
1001 "namespace includes other than ordinary or tag");
1002
1003 Decl *Prev = getPreviousDecl();
1004 IdentifierNamespace &= ~(IDNS_Ordinary | IDNS_Tag | IDNS_Type);
1005
1006 if (OldNS & (IDNS_Tag | IDNS_TagFriend)) {
1007 IdentifierNamespace |= IDNS_TagFriend;
1008 if (PerformFriendInjection ||
1009 (Prev && Prev->getIdentifierNamespace() & IDNS_Tag))
1010 IdentifierNamespace |= IDNS_Tag | IDNS_Type;
1011 }
1012
1013 if (OldNS & (IDNS_Ordinary | IDNS_OrdinaryFriend | IDNS_LocalExtern)) {
1014 IdentifierNamespace |= IDNS_OrdinaryFriend;
1015 if (PerformFriendInjection ||
1016 (Prev && Prev->getIdentifierNamespace() & IDNS_Ordinary))
1017 IdentifierNamespace |= IDNS_Ordinary;
1018 }
1019 }
1020
1021 enum FriendObjectKind {
1022 FOK_None, ///< Not a friend object.
1023 FOK_Declared, ///< A friend of a previously-declared entity.
1024 FOK_Undeclared ///< A friend of a previously-undeclared entity.
1025 };
1026
1027 /// \brief Determines whether this declaration is the object of a
1028 /// friend declaration and, if so, what kind.
1029 ///
1030 /// There is currently no direct way to find the associated FriendDecl.
1031 FriendObjectKind getFriendObjectKind() const {
1032 unsigned mask =
1033 (IdentifierNamespace & (IDNS_TagFriend | IDNS_OrdinaryFriend));
1034 if (!mask) return FOK_None;
1035 return (IdentifierNamespace & (IDNS_Tag | IDNS_Ordinary) ? FOK_Declared
1036 : FOK_Undeclared);
1037 }
1038
1039 /// Specifies that this declaration is a C++ overloaded non-member.
1040 void setNonMemberOperator() {
1041 assert(getKind() == Function || getKind() == FunctionTemplate);
1042 assert((IdentifierNamespace & IDNS_Ordinary) &&
1043 "visible non-member operators should be in ordinary namespace");
1044 IdentifierNamespace |= IDNS_NonMemberOperator;
1045 }
1046
1047 static bool classofKind(Kind K) { return true; }
1048 static DeclContext *castToDeclContext(const Decl *);
1049 static Decl *castFromDeclContext(const DeclContext *);
1050
1051 void print(raw_ostream &Out, unsigned Indentation = 0,
1052 bool PrintInstantiation = false) const;
1053 void print(raw_ostream &Out, const PrintingPolicy &Policy,
1054 unsigned Indentation = 0, bool PrintInstantiation = false) const;
1055 static void printGroup(Decl** Begin, unsigned NumDecls,
1056 raw_ostream &Out, const PrintingPolicy &Policy,
1057 unsigned Indentation = 0);
1058 // Debuggers don't usually respect default arguments.
1059 void dump() const;
1060 // Same as dump(), but forces color printing.
1061 void dumpColor() const;
1062 void dump(raw_ostream &Out, bool Deserialize = false) const;
1063
1064 /// \brief Looks through the Decl's underlying type to extract a FunctionType
1065 /// when possible. Will return null if the type underlying the Decl does not
1066 /// have a FunctionType.
1067 const FunctionType *getFunctionType(bool BlocksToo = true) const;
1068
1069private:
1070 void setAttrsImpl(const AttrVec& Attrs, ASTContext &Ctx);
1071 void setDeclContextsImpl(DeclContext *SemaDC, DeclContext *LexicalDC,
1072 ASTContext &Ctx);
1073
1074protected:
1075 ASTMutationListener *getASTMutationListener() const;
1076};
1077
1078/// \brief Determine whether two declarations declare the same entity.
1079inline bool declaresSameEntity(const Decl *D1, const Decl *D2) {
1080 if (!D1 || !D2)
1081 return false;
1082
1083 if (D1 == D2)
1084 return true;
1085
1086 return D1->getCanonicalDecl() == D2->getCanonicalDecl();
1087}
1088
1089/// PrettyStackTraceDecl - If a crash occurs, indicate that it happened when
1090/// doing something to a specific decl.
1091class PrettyStackTraceDecl : public llvm::PrettyStackTraceEntry {
1092 const Decl *TheDecl;
1093 SourceLocation Loc;
1094 SourceManager &SM;
1095 const char *Message;
1096public:
1097 PrettyStackTraceDecl(const Decl *theDecl, SourceLocation L,
1098 SourceManager &sm, const char *Msg)
1099 : TheDecl(theDecl), Loc(L), SM(sm), Message(Msg) {}
1100
1101 void print(raw_ostream &OS) const override;
1102};
1103
1104/// \brief The results of name lookup within a DeclContext. This is either a
1105/// single result (with no stable storage) or a collection of results (with
1106/// stable storage provided by the lookup table).
1107class DeclContextLookupResult {
1108 typedef ArrayRef<NamedDecl *> ResultTy;
1109 ResultTy Result;
1110 // If there is only one lookup result, it would be invalidated by
1111 // reallocations of the name table, so store it separately.
1112 NamedDecl *Single;
1113
1114 static NamedDecl *const SingleElementDummyList;
1115
1116public:
1117 DeclContextLookupResult() : Result(), Single() {}
1118 DeclContextLookupResult(ArrayRef<NamedDecl *> Result)
1119 : Result(Result), Single() {}
1120 DeclContextLookupResult(NamedDecl *Single)
1121 : Result(SingleElementDummyList), Single(Single) {}
1122
1123 class iterator;
1124 typedef llvm::iterator_adaptor_base<iterator, ResultTy::iterator,
1125 std::random_access_iterator_tag,
1126 NamedDecl *const> IteratorBase;
1127 class iterator : public IteratorBase {
1128 value_type SingleElement;
1129
1130 public:
1131 iterator() : IteratorBase(), SingleElement() {}
1132 explicit iterator(pointer Pos, value_type Single = nullptr)
1133 : IteratorBase(Pos), SingleElement(Single) {}
1134
1135 reference operator*() const {
1136 return SingleElement ? SingleElement : IteratorBase::operator*();
1137 }
1138 };
1139 typedef iterator const_iterator;
1140 typedef iterator::pointer pointer;
1141 typedef iterator::reference reference;
1142
1143 iterator begin() const { return iterator(Result.begin(), Single); }
1144 iterator end() const { return iterator(Result.end(), Single); }
1145
1146 bool empty() const { return Result.empty(); }
1147 pointer data() const { return Single ? &Single : Result.data(); }
1148 size_t size() const { return Single ? 1 : Result.size(); }
1149 reference front() const { return Single ? Single : Result.front(); }
1150 reference back() const { return Single ? Single : Result.back(); }
1151 reference operator[](size_t N) const { return Single ? Single : Result[N]; }
1152
1153 // FIXME: Remove this from the interface
1154 DeclContextLookupResult slice(size_t N) const {
1155 DeclContextLookupResult Sliced = Result.slice(N);
1156 Sliced.Single = Single;
1157 return Sliced;
1158 }
1159};
1160
1161/// DeclContext - This is used only as base class of specific decl types that
1162/// can act as declaration contexts. These decls are (only the top classes
1163/// that directly derive from DeclContext are mentioned, not their subclasses):
1164///
1165/// TranslationUnitDecl
1166/// NamespaceDecl
1167/// FunctionDecl
1168/// TagDecl
1169/// ObjCMethodDecl
1170/// ObjCContainerDecl
1171/// LinkageSpecDecl
1172/// ExportDecl
1173/// BlockDecl
1174/// OMPDeclareReductionDecl
1175///
1176class DeclContext {
1177 /// DeclKind - This indicates which class this is.
1178 unsigned DeclKind : 8;
1179
1180 /// \brief Whether this declaration context also has some external
1181 /// storage that contains additional declarations that are lexically
1182 /// part of this context.
1183 mutable bool ExternalLexicalStorage : 1;
1184
1185 /// \brief Whether this declaration context also has some external
1186 /// storage that contains additional declarations that are visible
1187 /// in this context.
1188 mutable bool ExternalVisibleStorage : 1;
1189
1190 /// \brief Whether this declaration context has had external visible
1191 /// storage added since the last lookup. In this case, \c LookupPtr's
1192 /// invariant may not hold and needs to be fixed before we perform
1193 /// another lookup.
1194 mutable bool NeedToReconcileExternalVisibleStorage : 1;
1195
1196 /// \brief If \c true, this context may have local lexical declarations
1197 /// that are missing from the lookup table.
1198 mutable bool HasLazyLocalLexicalLookups : 1;
1199
1200 /// \brief If \c true, the external source may have lexical declarations
1201 /// that are missing from the lookup table.
1202 mutable bool HasLazyExternalLexicalLookups : 1;
1203
1204 /// \brief If \c true, lookups should only return identifier from
1205 /// DeclContext scope (for example TranslationUnit). Used in
1206 /// LookupQualifiedName()
1207 mutable bool UseQualifiedLookup : 1;
1208
1209 /// \brief Pointer to the data structure used to lookup declarations
1210 /// within this context (or a DependentStoredDeclsMap if this is a
1211 /// dependent context). We maintain the invariant that, if the map
1212 /// contains an entry for a DeclarationName (and we haven't lazily
1213 /// omitted anything), then it contains all relevant entries for that
1214 /// name (modulo the hasExternalDecls() flag).
1215 mutable StoredDeclsMap *LookupPtr;
1216
1217protected:
1218 /// FirstDecl - The first declaration stored within this declaration
1219 /// context.
1220 mutable Decl *FirstDecl;
1221
1222 /// LastDecl - The last declaration stored within this declaration
1223 /// context. FIXME: We could probably cache this value somewhere
1224 /// outside of the DeclContext, to reduce the size of DeclContext by
1225 /// another pointer.
1226 mutable Decl *LastDecl;
1227
1228 friend class ExternalASTSource;
1229 friend class ASTDeclReader;
1230 friend class ASTWriter;
1231
1232 /// \brief Build up a chain of declarations.
1233 ///
1234 /// \returns the first/last pair of declarations.
1235 static std::pair<Decl *, Decl *>
1236 BuildDeclChain(ArrayRef<Decl*> Decls, bool FieldsAlreadyLoaded);
1237
1238 DeclContext(Decl::Kind K)
1239 : DeclKind(K), ExternalLexicalStorage(false),
1240 ExternalVisibleStorage(false),
1241 NeedToReconcileExternalVisibleStorage(false),
1242 HasLazyLocalLexicalLookups(false), HasLazyExternalLexicalLookups(false),
1243 UseQualifiedLookup(false),
1244 LookupPtr(nullptr), FirstDecl(nullptr), LastDecl(nullptr) {}
1245
1246public:
1247 ~DeclContext();
1248
1249 Decl::Kind getDeclKind() const {
1250 return static_cast<Decl::Kind>(DeclKind);
1251 }
1252 const char *getDeclKindName() const;
1253
1254 /// getParent - Returns the containing DeclContext.
1255 DeclContext *getParent() {
1256 return cast<Decl>(this)->getDeclContext();
1257 }
1258 const DeclContext *getParent() const {
1259 return const_cast<DeclContext*>(this)->getParent();
1260 }
1261
1262 /// getLexicalParent - Returns the containing lexical DeclContext. May be
1263 /// different from getParent, e.g.:
1264 ///
1265 /// namespace A {
1266 /// struct S;
1267 /// }
1268 /// struct A::S {}; // getParent() == namespace 'A'
1269 /// // getLexicalParent() == translation unit
1270 ///
1271 DeclContext *getLexicalParent() {
1272 return cast<Decl>(this)->getLexicalDeclContext();
1273 }
1274 const DeclContext *getLexicalParent() const {
1275 return const_cast<DeclContext*>(this)->getLexicalParent();
1276 }
1277
1278 DeclContext *getLookupParent();
1279
1280 const DeclContext *getLookupParent() const {
1281 return const_cast<DeclContext*>(this)->getLookupParent();
1282 }
1283
1284 ASTContext &getParentASTContext() const {
1285 return cast<Decl>(this)->getASTContext();
1286 }
1287
1288 bool isClosure() const {
1289 return DeclKind == Decl::Block;
1290 }
1291
1292 bool isObjCContainer() const {
1293 switch (DeclKind) {
1294 case Decl::ObjCCategory:
1295 case Decl::ObjCCategoryImpl:
1296 case Decl::ObjCImplementation:
1297 case Decl::ObjCInterface:
1298 case Decl::ObjCProtocol:
1299 return true;
1300 }
1301 return false;
1302 }
1303
1304 bool isFunctionOrMethod() const {
1305 switch (DeclKind) {
1306 case Decl::Block:
1307 case Decl::Captured:
1308 case Decl::ObjCMethod:
1309 return true;
1310 default:
1311 return DeclKind >= Decl::firstFunction && DeclKind <= Decl::lastFunction;
1312 }
1313 }
1314
1315 /// \brief Test whether the context supports looking up names.
1316 bool isLookupContext() const {
1317 return !isFunctionOrMethod() && DeclKind != Decl::LinkageSpec &&
1318 DeclKind != Decl::Export;
1319 }
1320
1321 bool isFileContext() const {
1322 return DeclKind == Decl::TranslationUnit || DeclKind == Decl::Namespace;
1323 }
1324
1325 bool isTranslationUnit() const {
1326 return DeclKind == Decl::TranslationUnit;
1327 }
1328
1329 bool isRecord() const {
1330 return DeclKind >= Decl::firstRecord && DeclKind <= Decl::lastRecord;
1331 }
1332
1333 bool isNamespace() const {
1334 return DeclKind == Decl::Namespace;
1335 }
1336
1337 bool isStdNamespace() const;
1338
1339 bool isInlineNamespace() const;
1340
1341 /// \brief Determines whether this context is dependent on a
1342 /// template parameter.
1343 bool isDependentContext() const;
1344
1345 /// isTransparentContext - Determines whether this context is a
1346 /// "transparent" context, meaning that the members declared in this
1347 /// context are semantically declared in the nearest enclosing
1348 /// non-transparent (opaque) context but are lexically declared in
1349 /// this context. For example, consider the enumerators of an
1350 /// enumeration type:
1351 /// @code
1352 /// enum E {
1353 /// Val1
1354 /// };
1355 /// @endcode
1356 /// Here, E is a transparent context, so its enumerator (Val1) will
1357 /// appear (semantically) that it is in the same context of E.
1358 /// Examples of transparent contexts include: enumerations (except for
1359 /// C++0x scoped enums), and C++ linkage specifications.
1360 bool isTransparentContext() const;
1361
1362 /// \brief Determines whether this context or some of its ancestors is a
1363 /// linkage specification context that specifies C linkage.
1364 bool isExternCContext() const;
1365
1366 /// \brief Retrieve the nearest enclosing C linkage specification context.
1367 const LinkageSpecDecl *getExternCContext() const;
1368
1369 /// \brief Determines whether this context or some of its ancestors is a
1370 /// linkage specification context that specifies C++ linkage.
1371 bool isExternCXXContext() const;
1372
1373 /// \brief Determine whether this declaration context is equivalent
1374 /// to the declaration context DC.
1375 bool Equals(const DeclContext *DC) const {
1376 return DC && this->getPrimaryContext() == DC->getPrimaryContext();
1377 }
1378
1379 /// \brief Determine whether this declaration context encloses the
1380 /// declaration context DC.
1381 bool Encloses(const DeclContext *DC) const;
1382
1383 /// \brief Find the nearest non-closure ancestor of this context,
1384 /// i.e. the innermost semantic parent of this context which is not
1385 /// a closure. A context may be its own non-closure ancestor.
1386 Decl *getNonClosureAncestor();
1387 const Decl *getNonClosureAncestor() const {
1388 return const_cast<DeclContext*>(this)->getNonClosureAncestor();
1389 }
1390
1391 /// getPrimaryContext - There may be many different
1392 /// declarations of the same entity (including forward declarations
1393 /// of classes, multiple definitions of namespaces, etc.), each with
1394 /// a different set of declarations. This routine returns the
1395 /// "primary" DeclContext structure, which will contain the
1396 /// information needed to perform name lookup into this context.
1397 DeclContext *getPrimaryContext();
1398 const DeclContext *getPrimaryContext() const {
1399 return const_cast<DeclContext*>(this)->getPrimaryContext();
1400 }
1401
1402 /// getRedeclContext - Retrieve the context in which an entity conflicts with
1403 /// other entities of the same name, or where it is a redeclaration if the
1404 /// two entities are compatible. This skips through transparent contexts.
1405 DeclContext *getRedeclContext();
1406 const DeclContext *getRedeclContext() const {
1407 return const_cast<DeclContext *>(this)->getRedeclContext();
1408 }
1409
1410 /// \brief Retrieve the nearest enclosing namespace context.
1411 DeclContext *getEnclosingNamespaceContext();
1412 const DeclContext *getEnclosingNamespaceContext() const {
1413 return const_cast<DeclContext *>(this)->getEnclosingNamespaceContext();
1414 }
1415
1416 /// \brief Retrieve the outermost lexically enclosing record context.
1417 RecordDecl *getOuterLexicalRecordContext();
1418 const RecordDecl *getOuterLexicalRecordContext() const {
1419 return const_cast<DeclContext *>(this)->getOuterLexicalRecordContext();
1420 }
1421
1422 /// \brief Test if this context is part of the enclosing namespace set of
1423 /// the context NS, as defined in C++0x [namespace.def]p9. If either context
1424 /// isn't a namespace, this is equivalent to Equals().
1425 ///
1426 /// The enclosing namespace set of a namespace is the namespace and, if it is
1427 /// inline, its enclosing namespace, recursively.
1428 bool InEnclosingNamespaceSetOf(const DeclContext *NS) const;
1429
1430 /// \brief Collects all of the declaration contexts that are semantically
1431 /// connected to this declaration context.
1432 ///
1433 /// For declaration contexts that have multiple semantically connected but
1434 /// syntactically distinct contexts, such as C++ namespaces, this routine
1435 /// retrieves the complete set of such declaration contexts in source order.
1436 /// For example, given:
1437 ///
1438 /// \code
1439 /// namespace N {
1440 /// int x;
1441 /// }
1442 /// namespace N {
1443 /// int y;
1444 /// }
1445 /// \endcode
1446 ///
1447 /// The \c Contexts parameter will contain both definitions of N.
1448 ///
1449 /// \param Contexts Will be cleared and set to the set of declaration
1450 /// contexts that are semanticaly connected to this declaration context,
1451 /// in source order, including this context (which may be the only result,
1452 /// for non-namespace contexts).
1453 void collectAllContexts(SmallVectorImpl<DeclContext *> &Contexts);
1454
1455 /// decl_iterator - Iterates through the declarations stored
1456 /// within this context.
1457 class decl_iterator {
1458 /// Current - The current declaration.
1459 Decl *Current;
1460
1461 public:
1462 typedef Decl *value_type;
1463 typedef const value_type &reference;
1464 typedef const value_type *pointer;
1465 typedef std::forward_iterator_tag iterator_category;
1466 typedef std::ptrdiff_t difference_type;
1467
1468 decl_iterator() : Current(nullptr) { }
1469 explicit decl_iterator(Decl *C) : Current(C) { }
1470
1471 reference operator*() const { return Current; }
1472 // This doesn't meet the iterator requirements, but it's convenient
1473 value_type operator->() const { return Current; }
1474
1475 decl_iterator& operator++() {
1476 Current = Current->getNextDeclInContext();
1477 return *this;
1478 }
1479
1480 decl_iterator operator++(int) {
1481 decl_iterator tmp(*this);
1482 ++(*this);
1483 return tmp;
1484 }
1485
1486 friend bool operator==(decl_iterator x, decl_iterator y) {
1487 return x.Current == y.Current;
1488 }
1489 friend bool operator!=(decl_iterator x, decl_iterator y) {
1490 return x.Current != y.Current;
1491 }
1492 };
1493
1494 typedef llvm::iterator_range<decl_iterator> decl_range;
1495
1496 /// decls_begin/decls_end - Iterate over the declarations stored in
1497 /// this context.
1498 decl_range decls() const { return decl_range(decls_begin(), decls_end()); }
1499 decl_iterator decls_begin() const;
1500 decl_iterator decls_end() const { return decl_iterator(); }
1501 bool decls_empty() const;
1502
1503 /// noload_decls_begin/end - Iterate over the declarations stored in this
1504 /// context that are currently loaded; don't attempt to retrieve anything
1505 /// from an external source.
1506 decl_range noload_decls() const {
1507 return decl_range(noload_decls_begin(), noload_decls_end());
1508 }
1509 decl_iterator noload_decls_begin() const { return decl_iterator(FirstDecl); }
1510 decl_iterator noload_decls_end() const { return decl_iterator(); }
1511
1512 /// specific_decl_iterator - Iterates over a subrange of
1513 /// declarations stored in a DeclContext, providing only those that
1514 /// are of type SpecificDecl (or a class derived from it). This
1515 /// iterator is used, for example, to provide iteration over just
1516 /// the fields within a RecordDecl (with SpecificDecl = FieldDecl).
1517 template<typename SpecificDecl>
1518 class specific_decl_iterator {
1519 /// Current - The current, underlying declaration iterator, which
1520 /// will either be NULL or will point to a declaration of
1521 /// type SpecificDecl.
1522 DeclContext::decl_iterator Current;
1523
1524 /// SkipToNextDecl - Advances the current position up to the next
1525 /// declaration of type SpecificDecl that also meets the criteria
1526 /// required by Acceptable.
1527 void SkipToNextDecl() {
1528 while (*Current && !isa<SpecificDecl>(*Current))
1529 ++Current;
1530 }
1531
1532 public:
1533 typedef SpecificDecl *value_type;
1534 // TODO: Add reference and pointer typedefs (with some appropriate proxy
1535 // type) if we ever have a need for them.
1536 typedef void reference;
1537 typedef void pointer;
1538 typedef std::iterator_traits<DeclContext::decl_iterator>::difference_type
1539 difference_type;
1540 typedef std::forward_iterator_tag iterator_category;
1541
1542 specific_decl_iterator() : Current() { }
1543
1544 /// specific_decl_iterator - Construct a new iterator over a
1545 /// subset of the declarations the range [C,
1546 /// end-of-declarations). If A is non-NULL, it is a pointer to a
1547 /// member function of SpecificDecl that should return true for
1548 /// all of the SpecificDecl instances that will be in the subset
1549 /// of iterators. For example, if you want Objective-C instance
1550 /// methods, SpecificDecl will be ObjCMethodDecl and A will be
1551 /// &ObjCMethodDecl::isInstanceMethod.
1552 explicit specific_decl_iterator(DeclContext::decl_iterator C) : Current(C) {
1553 SkipToNextDecl();
1554 }
1555
1556 value_type operator*() const { return cast<SpecificDecl>(*Current); }
1557 // This doesn't meet the iterator requirements, but it's convenient
1558 value_type operator->() const { return **this; }
1559
1560 specific_decl_iterator& operator++() {
1561 ++Current;
1562 SkipToNextDecl();
1563 return *this;
1564 }
1565
1566 specific_decl_iterator operator++(int) {
1567 specific_decl_iterator tmp(*this);
1568 ++(*this);
1569 return tmp;
1570 }
1571
1572 friend bool operator==(const specific_decl_iterator& x,
1573 const specific_decl_iterator& y) {
1574 return x.Current == y.Current;
1575 }
1576
1577 friend bool operator!=(const specific_decl_iterator& x,
1578 const specific_decl_iterator& y) {
1579 return x.Current != y.Current;
1580 }
1581 };
1582
1583 /// \brief Iterates over a filtered subrange of declarations stored
1584 /// in a DeclContext.
1585 ///
1586 /// This iterator visits only those declarations that are of type
1587 /// SpecificDecl (or a class derived from it) and that meet some
1588 /// additional run-time criteria. This iterator is used, for
1589 /// example, to provide access to the instance methods within an
1590 /// Objective-C interface (with SpecificDecl = ObjCMethodDecl and
1591 /// Acceptable = ObjCMethodDecl::isInstanceMethod).
1592 template<typename SpecificDecl, bool (SpecificDecl::*Acceptable)() const>
1593 class filtered_decl_iterator {
1594 /// Current - The current, underlying declaration iterator, which
1595 /// will either be NULL or will point to a declaration of
1596 /// type SpecificDecl.
1597 DeclContext::decl_iterator Current;
1598
1599 /// SkipToNextDecl - Advances the current position up to the next
1600 /// declaration of type SpecificDecl that also meets the criteria
1601 /// required by Acceptable.
1602 void SkipToNextDecl() {
1603 while (*Current &&
1604 (!isa<SpecificDecl>(*Current) ||
1605 (Acceptable && !(cast<SpecificDecl>(*Current)->*Acceptable)())))
1606 ++Current;
1607 }
1608
1609 public:
1610 typedef SpecificDecl *value_type;
1611 // TODO: Add reference and pointer typedefs (with some appropriate proxy
1612 // type) if we ever have a need for them.
1613 typedef void reference;
1614 typedef void pointer;
1615 typedef std::iterator_traits<DeclContext::decl_iterator>::difference_type
1616 difference_type;
1617 typedef std::forward_iterator_tag iterator_category;
1618
1619 filtered_decl_iterator() : Current() { }
1620
1621 /// filtered_decl_iterator - Construct a new iterator over a
1622 /// subset of the declarations the range [C,
1623 /// end-of-declarations). If A is non-NULL, it is a pointer to a
1624 /// member function of SpecificDecl that should return true for
1625 /// all of the SpecificDecl instances that will be in the subset
1626 /// of iterators. For example, if you want Objective-C instance
1627 /// methods, SpecificDecl will be ObjCMethodDecl and A will be
1628 /// &ObjCMethodDecl::isInstanceMethod.
1629 explicit filtered_decl_iterator(DeclContext::decl_iterator C) : Current(C) {
1630 SkipToNextDecl();
1631 }
1632
1633 value_type operator*() const { return cast<SpecificDecl>(*Current); }
1634 value_type operator->() const { return cast<SpecificDecl>(*Current); }
1635
1636 filtered_decl_iterator& operator++() {
1637 ++Current;
1638 SkipToNextDecl();
1639 return *this;
1640 }
1641
1642 filtered_decl_iterator operator++(int) {
1643 filtered_decl_iterator tmp(*this);
1644 ++(*this);
1645 return tmp;
1646 }
1647
1648 friend bool operator==(const filtered_decl_iterator& x,
1649 const filtered_decl_iterator& y) {
1650 return x.Current == y.Current;
1651 }
1652
1653 friend bool operator!=(const filtered_decl_iterator& x,
1654 const filtered_decl_iterator& y) {
1655 return x.Current != y.Current;
1656 }
1657 };
1658
1659 /// @brief Add the declaration D into this context.
1660 ///
1661 /// This routine should be invoked when the declaration D has first
1662 /// been declared, to place D into the context where it was
1663 /// (lexically) defined. Every declaration must be added to one
1664 /// (and only one!) context, where it can be visited via
1665 /// [decls_begin(), decls_end()). Once a declaration has been added
1666 /// to its lexical context, the corresponding DeclContext owns the
1667 /// declaration.
1668 ///
1669 /// If D is also a NamedDecl, it will be made visible within its
1670 /// semantic context via makeDeclVisibleInContext.
1671 void addDecl(Decl *D);
1672
1673 /// @brief Add the declaration D into this context, but suppress
1674 /// searches for external declarations with the same name.
1675 ///
1676 /// Although analogous in function to addDecl, this removes an
1677 /// important check. This is only useful if the Decl is being
1678 /// added in response to an external search; in all other cases,
1679 /// addDecl() is the right function to use.
1680 /// See the ASTImporter for use cases.
1681 void addDeclInternal(Decl *D);
1682
1683 /// @brief Add the declaration D to this context without modifying
1684 /// any lookup tables.
1685 ///
1686 /// This is useful for some operations in dependent contexts where
1687 /// the semantic context might not be dependent; this basically
1688 /// only happens with friends.
1689 void addHiddenDecl(Decl *D);
1690
1691 /// @brief Removes a declaration from this context.
1692 void removeDecl(Decl *D);
1693
1694 /// @brief Checks whether a declaration is in this context.
1695 bool containsDecl(Decl *D) const;
1696
1697 typedef DeclContextLookupResult lookup_result;
1698 typedef lookup_result::iterator lookup_iterator;
1699
1700 /// lookup - Find the declarations (if any) with the given Name in
1701 /// this context. Returns a range of iterators that contains all of
1702 /// the declarations with this name, with object, function, member,
1703 /// and enumerator names preceding any tag name. Note that this
1704 /// routine will not look into parent contexts.
1705 lookup_result lookup(DeclarationName Name) const;
1706
1707 /// \brief Find the declarations with the given name that are visible
1708 /// within this context; don't attempt to retrieve anything from an
1709 /// external source.
1710 lookup_result noload_lookup(DeclarationName Name);
1711
1712 /// \brief A simplistic name lookup mechanism that performs name lookup
1713 /// into this declaration context without consulting the external source.
1714 ///
1715 /// This function should almost never be used, because it subverts the
1716 /// usual relationship between a DeclContext and the external source.
1717 /// See the ASTImporter for the (few, but important) use cases.
1718 ///
1719 /// FIXME: This is very inefficient; replace uses of it with uses of
1720 /// noload_lookup.
1721 void localUncachedLookup(DeclarationName Name,
1722 SmallVectorImpl<NamedDecl *> &Results);
1723
1724 /// @brief Makes a declaration visible within this context.
1725 ///
1726 /// This routine makes the declaration D visible to name lookup
1727 /// within this context and, if this is a transparent context,
1728 /// within its parent contexts up to the first enclosing
1729 /// non-transparent context. Making a declaration visible within a
1730 /// context does not transfer ownership of a declaration, and a
1731 /// declaration can be visible in many contexts that aren't its
1732 /// lexical context.
1733 ///
1734 /// If D is a redeclaration of an existing declaration that is
1735 /// visible from this context, as determined by
1736 /// NamedDecl::declarationReplaces, the previous declaration will be
1737 /// replaced with D.
1738 void makeDeclVisibleInContext(NamedDecl *D);
1739
1740 /// all_lookups_iterator - An iterator that provides a view over the results
1741 /// of looking up every possible name.
1742 class all_lookups_iterator;
1743
1744 typedef llvm::iterator_range<all_lookups_iterator> lookups_range;
1745
1746 lookups_range lookups() const;
1747 lookups_range noload_lookups() const;
1748
1749 /// \brief Iterators over all possible lookups within this context.
1750 all_lookups_iterator lookups_begin() const;
1751 all_lookups_iterator lookups_end() const;
1752
1753 /// \brief Iterators over all possible lookups within this context that are
1754 /// currently loaded; don't attempt to retrieve anything from an external
1755 /// source.
1756 all_lookups_iterator noload_lookups_begin() const;
1757 all_lookups_iterator noload_lookups_end() const;
1758
1759 struct udir_iterator;
1760 typedef llvm::iterator_adaptor_base<udir_iterator, lookup_iterator,
1761 std::random_access_iterator_tag,
1762 UsingDirectiveDecl *> udir_iterator_base;
1763 struct udir_iterator : udir_iterator_base {
1764 udir_iterator(lookup_iterator I) : udir_iterator_base(I) {}
1765 UsingDirectiveDecl *operator*() const;
1766 };
1767
1768 typedef llvm::iterator_range<udir_iterator> udir_range;
1769
1770 udir_range using_directives() const;
1771
1772 // These are all defined in DependentDiagnostic.h.
1773 class ddiag_iterator;
1774 typedef llvm::iterator_range<DeclContext::ddiag_iterator> ddiag_range;
1775
1776 inline ddiag_range ddiags() const;
1777
1778 // Low-level accessors
1779
1780 /// \brief Mark that there are external lexical declarations that we need
1781 /// to include in our lookup table (and that are not available as external
1782 /// visible lookups). These extra lookup results will be found by walking
1783 /// the lexical declarations of this context. This should be used only if
1784 /// setHasExternalLexicalStorage() has been called on any decl context for
1785 /// which this is the primary context.
1786 void setMustBuildLookupTable() {
1787 assert(this == getPrimaryContext() &&
1788 "should only be called on primary context");
1789 HasLazyExternalLexicalLookups = true;
1790 }
1791
1792 /// \brief Retrieve the internal representation of the lookup structure.
1793 /// This may omit some names if we are lazily building the structure.
1794 StoredDeclsMap *getLookupPtr() const { return LookupPtr; }
1795
1796 /// \brief Ensure the lookup structure is fully-built and return it.
1797 StoredDeclsMap *buildLookup();
1798
1799 /// \brief Whether this DeclContext has external storage containing
1800 /// additional declarations that are lexically in this context.
1801 bool hasExternalLexicalStorage() const { return ExternalLexicalStorage; }
1802
1803 /// \brief State whether this DeclContext has external storage for
1804 /// declarations lexically in this context.
1805 void setHasExternalLexicalStorage(bool ES = true) {
1806 ExternalLexicalStorage = ES;
1807 }
1808
1809 /// \brief Whether this DeclContext has external storage containing
1810 /// additional declarations that are visible in this context.
1811 bool hasExternalVisibleStorage() const { return ExternalVisibleStorage; }
1812
1813 /// \brief State whether this DeclContext has external storage for
1814 /// declarations visible in this context.
1815 void setHasExternalVisibleStorage(bool ES = true) {
1816 ExternalVisibleStorage = ES;
1817 if (ES && LookupPtr)
1818 NeedToReconcileExternalVisibleStorage = true;
1819 }
1820
1821 /// \brief Determine whether the given declaration is stored in the list of
1822 /// declarations lexically within this context.
1823 bool isDeclInLexicalTraversal(const Decl *D) const {
1824 return D && (D->NextInContextAndBits.getPointer() || D == FirstDecl ||
1825 D == LastDecl);
1826 }
1827
1828 bool setUseQualifiedLookup(bool use = true) {
1829 bool old_value = UseQualifiedLookup;
1830 UseQualifiedLookup = use;
1831 return old_value;
1832 }
1833
1834 bool shouldUseQualifiedLookup() const {
1835 return UseQualifiedLookup;
1836 }
1837
1838 static bool classof(const Decl *D);
1839 static bool classof(const DeclContext *D) { return true; }
1840
1841 void dumpDeclContext() const;
1842 void dumpLookups() const;
1843 void dumpLookups(llvm::raw_ostream &OS, bool DumpDecls = false,
1844 bool Deserialize = false) const;
1845
1846private:
1847 void reconcileExternalVisibleStorage() const;
1848 bool LoadLexicalDeclsFromExternalStorage() const;
1849
1850 /// @brief Makes a declaration visible within this context, but
1851 /// suppresses searches for external declarations with the same
1852 /// name.
1853 ///
1854 /// Analogous to makeDeclVisibleInContext, but for the exclusive
1855 /// use of addDeclInternal().
1856 void makeDeclVisibleInContextInternal(NamedDecl *D);
1857
1858 friend class DependentDiagnostic;
1859 StoredDeclsMap *CreateStoredDeclsMap(ASTContext &C) const;
1860
1861 void buildLookupImpl(DeclContext *DCtx, bool Internal);
1862 void makeDeclVisibleInContextWithFlags(NamedDecl *D, bool Internal,
1863 bool Rediscoverable);
1864 void makeDeclVisibleInContextImpl(NamedDecl *D, bool Internal);
1865};
1866
1867inline bool Decl::isTemplateParameter() const {
1868 return getKind() == TemplateTypeParm || getKind() == NonTypeTemplateParm ||
1869 getKind() == TemplateTemplateParm;
1870}
1871
1872// Specialization selected when ToTy is not a known subclass of DeclContext.
1873template <class ToTy,
1874 bool IsKnownSubtype = ::std::is_base_of<DeclContext, ToTy>::value>
1875struct cast_convert_decl_context {
1876 static const ToTy *doit(const DeclContext *Val) {
1877 return static_cast<const ToTy*>(Decl::castFromDeclContext(Val));
1878 }
1879
1880 static ToTy *doit(DeclContext *Val) {
1881 return static_cast<ToTy*>(Decl::castFromDeclContext(Val));
1882 }
1883};
1884
1885// Specialization selected when ToTy is a known subclass of DeclContext.
1886template <class ToTy>
1887struct cast_convert_decl_context<ToTy, true> {
1888 static const ToTy *doit(const DeclContext *Val) {
1889 return static_cast<const ToTy*>(Val);
1890 }
1891
1892 static ToTy *doit(DeclContext *Val) {
1893 return static_cast<ToTy*>(Val);
1894 }
1895};
1896
1897
1898} // end clang.
1899
1900namespace llvm {
1901
1902/// isa<T>(DeclContext*)
1903template <typename To>
1904struct isa_impl<To, ::clang::DeclContext> {
1905 static bool doit(const ::clang::DeclContext &Val) {
1906 return To::classofKind(Val.getDeclKind());
1907 }
1908};
1909
1910/// cast<T>(DeclContext*)
1911template<class ToTy>
1912struct cast_convert_val<ToTy,
1913 const ::clang::DeclContext,const ::clang::DeclContext> {
1914 static const ToTy &doit(const ::clang::DeclContext &Val) {
1915 return *::clang::cast_convert_decl_context<ToTy>::doit(&Val);
1916 }
1917};
1918template<class ToTy>
1919struct cast_convert_val<ToTy, ::clang::DeclContext, ::clang::DeclContext> {
1920 static ToTy &doit(::clang::DeclContext &Val) {
1921 return *::clang::cast_convert_decl_context<ToTy>::doit(&Val);
1922 }
1923};
1924template<class ToTy>
1925struct cast_convert_val<ToTy,
1926 const ::clang::DeclContext*, const ::clang::DeclContext*> {
1927 static const ToTy *doit(const ::clang::DeclContext *Val) {
1928 return ::clang::cast_convert_decl_context<ToTy>::doit(Val);
1929 }
1930};
1931template<class ToTy>
1932struct cast_convert_val<ToTy, ::clang::DeclContext*, ::clang::DeclContext*> {
1933 static ToTy *doit(::clang::DeclContext *Val) {
1934 return ::clang::cast_convert_decl_context<ToTy>::doit(Val);
1935 }
1936};
1937
1938/// Implement cast_convert_val for Decl -> DeclContext conversions.
1939template<class FromTy>
1940struct cast_convert_val< ::clang::DeclContext, FromTy, FromTy> {
1941 static ::clang::DeclContext &doit(const FromTy &Val) {
1942 return *FromTy::castToDeclContext(&Val);
1943 }
1944};
1945
1946template<class FromTy>
1947struct cast_convert_val< ::clang::DeclContext, FromTy*, FromTy*> {
1948 static ::clang::DeclContext *doit(const FromTy *Val) {
1949 return FromTy::castToDeclContext(Val);
1950 }
1951};
1952
1953template<class FromTy>
1954struct cast_convert_val< const ::clang::DeclContext, FromTy, FromTy> {
1955 static const ::clang::DeclContext &doit(const FromTy &Val) {
1956 return *FromTy::castToDeclContext(&Val);
1957 }
1958};
1959
1960template<class FromTy>
1961struct cast_convert_val< const ::clang::DeclContext, FromTy*, FromTy*> {
1962 static const ::clang::DeclContext *doit(const FromTy *Val) {
1963 return FromTy::castToDeclContext(Val);
1964 }
1965};
1966
1967} // end namespace llvm
1968
1969#endif
1970