DeclBase.h source code [clang/include/clang/AST/DeclBase.h]

1	//===- DeclBase.h - Base Classes for representing declarations --- C++ --===//
2	//
3	// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4	// See https://llvm.org/LICENSE.txt for license information.
5	// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6	//
7	//===----------------------------------------------------------------------===//
8	//
9	// This file defines the Decl and DeclContext interfaces.
10	//
11	//===----------------------------------------------------------------------===//
12
13	#ifndef LLVM_CLANG_AST_DECLBASE_H
14	#define LLVM_CLANG_AST_DECLBASE_H
15
16	#include "clang/AST/ASTDumperUtils.h"
17	#include "clang/AST/AttrIterator.h"
18	#include "clang/AST/DeclarationName.h"
19	#include "clang/Basic/IdentifierTable.h"
20	#include "clang/Basic/LLVM.h"
21	#include "clang/Basic/SourceLocation.h"
22	#include "clang/Basic/Specifiers.h"
23	#include "llvm/ADT/ArrayRef.h"
24	#include "llvm/ADT/PointerIntPair.h"
25	#include "llvm/ADT/PointerUnion.h"
26	#include "llvm/ADT/iterator.h"
27	#include "llvm/ADT/iterator_range.h"
28	#include "llvm/Support/Casting.h"
29	#include "llvm/Support/Compiler.h"
30	#include "llvm/Support/PrettyStackTrace.h"
31	#include "llvm/Support/VersionTuple.h"
32	#include <algorithm>
33	#include <cassert>
34	#include <cstddef>
35	#include <iterator>
36	#include <string>
37	#include <type_traits>
38	#include <utility>
39
40	namespace clang {
41
42	class ASTContext;
43	class ASTMutationListener;
44	class Attr;
45	class BlockDecl;
46	class DeclContext;
47	class ExternalSourceSymbolAttr;
48	class FunctionDecl;
49	class FunctionType;
50	class IdentifierInfo;
51	enum Linkage : unsigned char;
52	class LinkageSpecDecl;
53	class Module;
54	class NamedDecl;
55	class ObjCCategoryDecl;
56	class ObjCCategoryImplDecl;
57	class ObjCContainerDecl;
58	class ObjCImplDecl;
59	class ObjCImplementationDecl;
60	class ObjCInterfaceDecl;
61	class ObjCMethodDecl;
62	class ObjCProtocolDecl;
63	struct PrintingPolicy;
64	class RecordDecl;
65	class SourceManager;
66	class Stmt;
67	class StoredDeclsMap;
68	class TemplateDecl;
69	class TemplateParameterList;
70	class TranslationUnitDecl;
71	class UsingDirectiveDecl;
72
73	/// Captures the result of checking the availability of a
74	/// declaration.
75	enum AvailabilityResult {
76	AR_Available = `0`,
77	AR_NotYetIntroduced,
78	AR_Deprecated,
79	AR_Unavailable
80	};
81
82	/// Decl - This represents one declaration (or definition), e.g. a variable,
83	/// typedef, function, struct, etc.
84	///
85	/// Note: There are objects tacked on before the beginning* of Decl*
86	/// (and its subclasses) in its Decl::operator new(). Proper alignment
87	/// of all subclasses (not requiring more than the alignment of Decl) is
88	/// asserted in DeclBase.cpp.
89	class alignas(`8`) Decl {
90	public:
91	/// Lists the kind of concrete classes of Decl.
92	enum Kind {
93	#define DECL(DERIVED, BASE) DERIVED,
94	#define ABSTRACT_DECL(DECL)
95	#define DECL_RANGE(BASE, START, END) \
96	first##BASE = START, last##BASE = END,
97	#define LAST_DECL_RANGE(BASE, START, END) \
98	first##BASE = START, last##BASE = END
99	#include "clang/AST/DeclNodes.inc"
100	};
101
102	/// A placeholder type used to construct an empty shell of a
103	/// decl-derived type that will be filled in later (e.g., by some
104	/// deserialization method).
105	struct EmptyShell {};
106
107	/// IdentifierNamespace - The different namespaces in which
108	/// declarations may appear. According to C99 6.2.3, there are
109	/// four namespaces, labels, tags, members and ordinary
110	/// identifiers. C++ describes lookup completely differently:
111	/// certain lookups merely "ignore" certain kinds of declarations,
112	/// usually based on whether the declaration is of a type, etc.
113	///
114	/// These are meant as bitmasks, so that searches in
115	/// C++ can look into the "tag" namespace during ordinary lookup.
116	///
117	/// Decl currently provides 15 bits of IDNS bits.
118	enum IdentifierNamespace {
119	/// Labels, declared with 'x:' and referenced with 'goto x'.
120	IDNS_Label = `0x0001`,
121
122	/// Tags, declared with 'struct foo;' and referenced with
123	/// 'struct foo'. All tags are also types. This is what
124	/// elaborated-type-specifiers look for in C.
125	/// This also contains names that conflict with tags in the
126	/// same scope but that are otherwise ordinary names (non-type
127	/// template parameters and indirect field declarations).
128	IDNS_Tag = `0x0002`,
129
130	/// Types, declared with 'struct foo', typedefs, etc.
131	/// This is what elaborated-type-specifiers look for in C++,
132	/// but note that it's ill-formed to find a non-tag.
133	IDNS_Type = `0x0004`,
134
135	/// Members, declared with object declarations within tag
136	/// definitions. In C, these can only be found by "qualified"
137	/// lookup in member expressions. In C++, they're found by
138	/// normal lookup.
139	IDNS_Member = `0x0008`,
140
141	/// Namespaces, declared with 'namespace foo {}'.
142	/// Lookup for nested-name-specifiers find these.
143	IDNS_Namespace = `0x0010`,
144
145	/// Ordinary names. In C, everything that's not a label, tag,
146	/// member, or function-local extern ends up here.
147	IDNS_Ordinary = `0x0020`,
148
149	/// Objective C \@protocol.
150	IDNS_ObjCProtocol = `0x0040`,
151
152	/// This declaration is a friend function. A friend function
153	/// declaration is always in this namespace but may also be in
154	/// IDNS_Ordinary if it was previously declared.
155	IDNS_OrdinaryFriend = `0x0080`,
156
157	/// This declaration is a friend class. A friend class
158	/// declaration is always in this namespace but may also be in
159	/// IDNS_Tag\|IDNS_Type if it was previously declared.
160	IDNS_TagFriend = `0x0100`,
161
162	/// This declaration is a using declaration. A using declaration
163	/// introduces* a number of other declarations into the current*
164	/// scope, and those declarations use the IDNS of their targets,
165	/// but the actual using declarations go in this namespace.
166	IDNS_Using = `0x0200`,
167
168	/// This declaration is a C++ operator declared in a non-class
169	/// context. All such operators are also in IDNS_Ordinary.
170	/// C++ lexical operator lookup looks for these.
171	IDNS_NonMemberOperator = `0x0400`,
172
173	/// This declaration is a function-local extern declaration of a
174	/// variable or function. This may also be IDNS_Ordinary if it
175	/// has been declared outside any function. These act mostly like
176	/// invisible friend declarations, but are also visible to unqualified
177	/// lookup within the scope of the declaring function.
178	IDNS_LocalExtern = `0x0800`,
179
180	/// This declaration is an OpenMP user defined reduction construction.
181	IDNS_OMPReduction = `0x1000`,
182
183	/// This declaration is an OpenMP user defined mapper.
184	IDNS_OMPMapper = `0x2000`,
185	};
186
187	/// ObjCDeclQualifier - 'Qualifiers' written next to the return and
188	/// parameter types in method declarations. Other than remembering
189	/// them and mangling them into the method's signature string, these
190	/// are ignored by the compiler; they are consumed by certain
191	/// remote-messaging frameworks.
192	///
193	/// in, inout, and out are mutually exclusive and apply only to
194	/// method parameters. bycopy and byref are mutually exclusive and
195	/// apply only to method parameters (?). oneway applies only to
196	/// results. All of these expect their corresponding parameter to
197	/// have a particular type. None of this is currently enforced by
198	/// clang.
199	///
200	/// This should be kept in sync with ObjCDeclSpec::ObjCDeclQualifier.
201	enum ObjCDeclQualifier {
202	OBJC_TQ_None = `0x0`,
203	OBJC_TQ_In = `0x1`,
204	OBJC_TQ_Inout = `0x2`,
205	OBJC_TQ_Out = `0x4`,
206	OBJC_TQ_Bycopy = `0x8`,
207	OBJC_TQ_Byref = `0x10`,
208	OBJC_TQ_Oneway = `0x20`,
209
210	/// The nullability qualifier is set when the nullability of the
211	/// result or parameter was expressed via a context-sensitive
212	/// keyword.
213	OBJC_TQ_CSNullability = `0x40`
214	};
215
216	/// The kind of ownership a declaration has, for visibility purposes.
217	/// This enumeration is designed such that higher values represent higher
218	/// levels of name hiding.
219	enum class ModuleOwnershipKind : unsigned {
220	/// This declaration is not owned by a module.
221	Unowned,
222
223	/// This declaration has an owning module, but is globally visible
224	/// (typically because its owning module is visible and we know that
225	/// modules cannot later become hidden in this compilation).
226	/// After serialization and deserialization, this will be converted
227	/// to VisibleWhenImported.
228	Visible,
229
230	/// This declaration has an owning module, and is visible when that
231	/// module is imported.
232	VisibleWhenImported,
233
234	/// This declaration has an owning module, but is only visible to
235	/// lookups that occur within that module.
236	ModulePrivate
237	};
238
239	protected:
240	/// The next declaration within the same lexical
241	/// DeclContext. These pointers form the linked list that is
242	/// traversed via DeclContext's decls_begin()/decls_end().
243	///
244	/// The extra two bits are used for the ModuleOwnershipKind.
245	llvm::PointerIntPair<Decl *, `2`, ModuleOwnershipKind> NextInContextAndBits;
246
247	private:
248	friend class DeclContext;
249
250	struct MultipleDC {
251	DeclContext *SemanticDC;
252	DeclContext *LexicalDC;
253	};
254
255	/// DeclCtx - Holds either a DeclContext or a MultipleDC.
256	/// For declarations that don't contain C++ scope specifiers, it contains
257	/// the DeclContext where the Decl was declared.
258	/// For declarations with C++ scope specifiers, it contains a MultipleDC*
259	/// with the context where it semantically belongs (SemanticDC) and the
260	/// context where it was lexically declared (LexicalDC).
261	/// e.g.:
262	///
263	/// namespace A {
264	/// void f(); // SemanticDC == LexicalDC == 'namespace A'
265	/// }
266	/// void A::f(); // SemanticDC == namespace 'A'
267	/// // LexicalDC == global namespace
268	llvm::PointerUnion<DeclContext, MultipleDC> DeclCtx;
269
270	bool isInSemaDC() const { return DeclCtx.is<DeclContext*>(); }
271	bool isOutOfSemaDC() const { return DeclCtx.is<MultipleDC*>(); }
272
273	MultipleDC getMultipleDC() const* {
274	return DeclCtx.get<MultipleDC*>();
275	}
276
277	DeclContext getSemanticDC() const* {
278	return DeclCtx.get<DeclContext*>();
279	}
280
281	/// Loc - The location of this decl.
282	SourceLocation Loc;
283
284	/// DeclKind - This indicates which class this is.
285	unsigned DeclKind : `7`;
286
287	/// InvalidDecl - This indicates a semantic error occurred.
288	unsigned InvalidDecl : `1`;
289
290	/// HasAttrs - This indicates whether the decl has attributes or not.
291	unsigned HasAttrs : `1`;
292
293	/// Implicit - Whether this declaration was implicitly generated by
294	/// the implementation rather than explicitly written by the user.
295	unsigned Implicit : `1`;
296
297	/// Whether this declaration was "used", meaning that a definition is
298	/// required.
299	unsigned Used : `1`;
300
301	/// Whether this declaration was "referenced".
302	/// The difference with 'Used' is whether the reference appears in a
303	/// evaluated context or not, e.g. functions used in uninstantiated templates
304	/// are regarded as "referenced" but not "used".
305	unsigned Referenced : `1`;
306
307	/// Whether this declaration is a top-level declaration (function,
308	/// global variable, etc.) that is lexically inside an objc container
309	/// definition.
310	unsigned TopLevelDeclInObjCContainer : `1`;
311
312	/// Whether statistic collection is enabled.
313	static bool StatisticsEnabled;
314
315	protected:
316	friend class ASTDeclReader;
317	friend class ASTDeclWriter;
318	friend class ASTNodeImporter;
319	friend class ASTReader;
320	friend class CXXClassMemberWrapper;
321	friend class LinkageComputer;
322	template<typename decl_type> friend class Redeclarable;
323
324	/// Access - Used by C++ decls for the access specifier.
325	// NOTE: VC++ treats enums as signed, avoid using the AccessSpecifier enum
326	unsigned Access : `2`;
327
328	/// Whether this declaration was loaded from an AST file.
329	unsigned FromASTFile : `1`;
330
331	/// IdentifierNamespace - This specifies what IDNS_ namespace this lives in.*
332	unsigned IdentifierNamespace : `14`;
333
334	/// If 0, we have not computed the linkage of this declaration.
335	/// Otherwise, it is the linkage + 1.
336	mutable unsigned CacheValidAndLinkage : `3`;
337
338	/// Allocate memory for a deserialized declaration.
339	///
340	/// This routine must be used to allocate memory for any declaration that is
341	/// deserialized from a module file.
342	///
343	/// \param Size The size of the allocated object.
344	/// \param Ctx The context in which we will allocate memory.
345	/// \param ID The global ID of the deserialized declaration.
346	/// \param Extra The amount of extra space to allocate after the object.
347	void *operator new(std::size_t Size, const ASTContext &Ctx, unsigned ID,
348	std::size_t Extra = `0`);
349
350	/// Allocate memory for a non-deserialized declaration.
351	void *operator new(std::size_t Size, const ASTContext &Ctx,
352	DeclContext *Parent, std::size_t Extra = `0`);
353
354	private:
355	bool AccessDeclContextSanity() const;
356
357	/// Get the module ownership kind to use for a local lexical child of \p DC,
358	/// which may be either a local or (rarely) an imported declaration.
359	static ModuleOwnershipKind getModuleOwnershipKindForChildOf(DeclContext *DC) {
360	if (DC) {
361	auto *D = cast<Decl>(DC);
362	auto MOK = D->getModuleOwnershipKind();
363	if (MOK != ModuleOwnershipKind::Unowned &&
364	(!D->isFromASTFile() \|\| D->hasLocalOwningModuleStorage()))
365	return MOK;
366	// If D is not local and we have no local module storage, then we don't
367	// need to track module ownership at all.
368	}
369	return ModuleOwnershipKind::Unowned;
370	}
371
372	public:
373	Decl() = delete;
374	Decl(const Decl&) = delete;
375	Decl(Decl &&) = delete;
376	Decl &operator=(const Decl&) = delete;
377	Decl &operator=(Decl&&) = delete;
378
379	protected:
380	Decl(Kind DK, DeclContext *DC, SourceLocation L)
381	: NextInContextAndBits (nullptr, getModuleOwnershipKindForChildOf(DC)),
382	DeclCtx (DC), Loc (L), DeclKind(DK), InvalidDecl(false), HasAttrs(false),
383	Implicit(false), Used(false), Referenced(false),
384	TopLevelDeclInObjCContainer(false), Access(AS_none), FromASTFile(`0`),
385	IdentifierNamespace(getIdentifierNamespaceForKind(DK)),
386	CacheValidAndLinkage(`0`) {
387	if (StatisticsEnabled) add(DK);
388	}
389
390	Decl(Kind DK, EmptyShell Empty)
391	: DeclKind(DK), InvalidDecl(false), HasAttrs(false), Implicit(false),
392	Used(false), Referenced(false), TopLevelDeclInObjCContainer(false),
393	Access(AS_none), FromASTFile(`0`),
394	IdentifierNamespace(getIdentifierNamespaceForKind(DK)),
395	CacheValidAndLinkage(`0`) {
396	if (StatisticsEnabled) add(DK);
397	}
398
399	virtual ~Decl();
400
401	/// Update a potentially out-of-date declaration.
402	void updateOutOfDate(IdentifierInfo &II) const;
403
404	Linkage getCachedLinkage() const {
405	return Linkage(CacheValidAndLinkage - `1`);
406	}
407
408	void setCachedLinkage(Linkage L) const {
409	CacheValidAndLinkage = L + `1`;
410	}
411
412	bool hasCachedLinkage() const {
413	return CacheValidAndLinkage;
414	}
415
416	public:
417	/// Source range that this declaration covers.
418	virtual SourceRange getSourceRange() const LLVM_READONLY {
419	return SourceRange (getLocation(), getLocation());
420	}
421
422	SourceLocation getBeginLoc() const LLVM_READONLY {
423	return getSourceRange().getBegin();
424	}
425
426	SourceLocation getEndLoc() const LLVM_READONLY {
427	return getSourceRange().getEnd();
428	}
429
430	SourceLocation getLocation() const { return Loc; }
431	void setLocation(SourceLocation L) { Loc = L; }
432
433	Kind getKind() const { return static_cast<Kind>(DeclKind); }
434	const char getDeclKindName() const*;
435
436	Decl getNextDeclInContext() { return* NextInContextAndBits.getPointer(); }
437	const Decl getNextDeclInContext() const* {return NextInContextAndBits.getPointer();}
438
439	DeclContext *getDeclContext() {
440	if (isInSemaDC())
441	return getSemanticDC();
442	return getMultipleDC()->SemanticDC;
443	}
444	const DeclContext getDeclContext() const* {
445	return const_cast<Decl>(this*)->getDeclContext();
446	}
447
448	/// Find the innermost non-closure ancestor of this declaration,
449	/// walking up through blocks, lambdas, etc. If that ancestor is
450	/// not a code context (!isFunctionOrMethod()), returns null.
451	///
452	/// A declaration may be its own non-closure context.
453	Decl *getNonClosureContext();
454	const Decl getNonClosureContext() const* {
455	return const_cast<Decl>(this*)->getNonClosureContext();
456	}
457
458	TranslationUnitDecl *getTranslationUnitDecl();
459	const TranslationUnitDecl getTranslationUnitDecl() const* {
460	return const_cast<Decl>(this*)->getTranslationUnitDecl();
461	}
462
463	bool isInAnonymousNamespace() const;
464
465	bool isInStdNamespace() const;
466
467	ASTContext &getASTContext() const LLVM_READONLY;
468
469	/// Helper to get the language options from the ASTContext.
470	/// Defined out of line to avoid depending on ASTContext.h.
471	const LangOptions &getLangOpts() const LLVM_READONLY;
472
473	void setAccess(AccessSpecifier AS) {
474	Access = AS;
475	assert(AccessDeclContextSanity());
476	}
477
478	AccessSpecifier getAccess() const {
479	assert(AccessDeclContextSanity());
480	return AccessSpecifier(Access);
481	}
482
483	/// Retrieve the access specifier for this declaration, even though
484	/// it may not yet have been properly set.
485	AccessSpecifier getAccessUnsafe() const {
486	return AccessSpecifier(Access);
487	}
488
489	bool hasAttrs() const { return HasAttrs; }
490
491	void setAttrs(const AttrVec& Attrs) {
492	return setAttrsImpl(Attrs, getASTContext());
493	}
494
495	AttrVec &getAttrs() {
496	return const_cast<AttrVec&>(const_cast<const Decl>(this*)->getAttrs());
497	}
498
499	const AttrVec &getAttrs() const;
500	void dropAttrs();
501	void addAttr(Attr *A);
502
503	using attr_iterator = AttrVec::const_iterator;
504	using attr_range = llvm::iterator_range<attr_iterator>;
505
506	attr_range attrs() const {
507	return attr_range (attr_begin(), attr_end());
508	}
509
510	attr_iterator attr_begin() const {
511	return hasAttrs() ? getAttrs().begin() : nullptr;
512	}
513	attr_iterator attr_end() const {
514	return hasAttrs() ? getAttrs().end() : nullptr;
515	}
516
517	template <typename T>
518	void dropAttr() {
519	if (!HasAttrs) return;
520
521	AttrVec &Vec = getAttrs();
522	llvm::erase_if(Vec, [](Attr A) { return* isa<T>(A); });
523
524	if (Vec.empty())
525	HasAttrs = false;
526	}
527
528	template <typename T>
529	llvm::iterator_range<specific_attr_iterator<T>> specific_attrs() const {
530	return llvm::make_range(specific_attr_begin<T>(), specific_attr_end<T>());
531	}
532
533	template <typename T>
534	specific_attr_iterator<T> specific_attr_begin() const {
535	return specific_attr_iterator<T>(attr_begin());
536	}
537
538	template <typename T>
539	specific_attr_iterator<T> specific_attr_end() const {
540	return specific_attr_iterator<T>(attr_end());
541	}
542
543	template<typename T> T getAttr() const* {
544	return hasAttrs() ? getSpecificAttr<T>(getAttrs()) : nullptr;
545	}
546
547	template<typename T> bool hasAttr() const {
548	return hasAttrs() && hasSpecificAttr<T>(getAttrs());
549	}
550
551	/// getMaxAlignment - return the maximum alignment specified by attributes
552	/// on this decl, 0 if there are none.
553	unsigned getMaxAlignment() const;
554
555	/// setInvalidDecl - Indicates the Decl had a semantic error. This
556	/// allows for graceful error recovery.
557	void setInvalidDecl(bool Invalid = true);
558	bool isInvalidDecl() const { return (bool) InvalidDecl; }
559
560	/// isImplicit - Indicates whether the declaration was implicitly
561	/// generated by the implementation. If false, this declaration
562	/// was written explicitly in the source code.
563	bool isImplicit() const { return Implicit; }
564	void setImplicit(bool I = true) { Implicit = I; }
565
566	/// Whether any* (re-)declaration of the entity was used, meaning that*
567	/// a definition is required.
568	///
569	/// \param CheckUsedAttr When true, also consider the "used" attribute
570	/// (in addition to the "used" bit set by \c setUsed()) when determining
571	/// whether the function is used.
572	bool isUsed(bool CheckUsedAttr = true) const;
573
574	/// Set whether the declaration is used, in the sense of odr-use.
575	///
576	/// This should only be used immediately after creating a declaration.
577	/// It intentionally doesn't notify any listeners.
578	void setIsUsed() { getCanonicalDecl()->Used = true; }
579
580	/// Mark the declaration used, in the sense of odr-use.
581	///
582	/// This notifies any mutation listeners in addition to setting a bit
583	/// indicating the declaration is used.
584	void markUsed(ASTContext &C);
585
586	/// Whether any declaration of this entity was referenced.
587	bool isReferenced() const;
588
589	/// Whether this declaration was referenced. This should not be relied
590	/// upon for anything other than debugging.
591	bool isThisDeclarationReferenced() const { return Referenced; }
592
593	void setReferenced(bool R = true) { Referenced = R; }
594
595	/// Whether this declaration is a top-level declaration (function,
596	/// global variable, etc.) that is lexically inside an objc container
597	/// definition.
598	bool isTopLevelDeclInObjCContainer() const {
599	return TopLevelDeclInObjCContainer;
600	}
601
602	void setTopLevelDeclInObjCContainer(bool V = true) {
603	TopLevelDeclInObjCContainer = V;
604	}
605
606	/// Looks on this and related declarations for an applicable
607	/// external source symbol attribute.
608	ExternalSourceSymbolAttr getExternalSourceSymbolAttr() const*;
609
610	/// Whether this declaration was marked as being private to the
611	/// module in which it was defined.
612	bool isModulePrivate() const {
613	return getModuleOwnershipKind() == ModuleOwnershipKind::ModulePrivate;
614	}
615
616	/// Return true if this declaration has an attribute which acts as
617	/// definition of the entity, such as 'alias' or 'ifunc'.
618	bool hasDefiningAttr() const;
619
620	/// Return this declaration's defining attribute if it has one.
621	const Attr getDefiningAttr() const*;
622
623	protected:
624	/// Specify that this declaration was marked as being private
625	/// to the module in which it was defined.
626	void setModulePrivate() {
627	// The module-private specifier has no effect on unowned declarations.
628	// FIXME: We should track this in some way for source fidelity.
629	if (getModuleOwnershipKind() == ModuleOwnershipKind::Unowned)
630	return;
631	setModuleOwnershipKind(ModuleOwnershipKind::ModulePrivate);
632	}
633
634	public:
635	/// Set the FromASTFile flag. This indicates that this declaration
636	/// was deserialized and not parsed from source code and enables
637	/// features such as module ownership information.
638	void setFromASTFile() {
639	FromASTFile = true;
640	}
641
642	/// Set the owning module ID. This may only be called for
643	/// deserialized Decls.
644	void setOwningModuleID(unsigned ID) {
645	assert(isFromASTFile() && "Only works on a deserialized declaration");
646	((unsigned)this** - `2`) = ID;
647	}
648
649	public:
650	/// Determine the availability of the given declaration.
651	///
652	/// This routine will determine the most restrictive availability of
653	/// the given declaration (e.g., preferring 'unavailable' to
654	/// 'deprecated').
655	///
656	/// \param Message If non-NULL and the result is not \c
657	/// AR_Available, will be set to a (possibly empty) message
658	/// describing why the declaration has not been introduced, is
659	/// deprecated, or is unavailable.
660	///
661	/// \param EnclosingVersion The version to compare with. If empty, assume the
662	/// deployment target version.
663	///
664	/// \param RealizedPlatform If non-NULL and the availability result is found
665	/// in an available attribute it will set to the platform which is written in
666	/// the available attribute.
667	AvailabilityResult
668	getAvailability(std::string Message = nullptr*,
669	VersionTuple EnclosingVersion = VersionTuple (),
670	StringRef RealizedPlatform = nullptr) const*;
671
672	/// Retrieve the version of the target platform in which this
673	/// declaration was introduced.
674	///
675	/// \returns An empty version tuple if this declaration has no 'introduced'
676	/// availability attributes, or the version tuple that's specified in the
677	/// attribute otherwise.
678	VersionTuple getVersionIntroduced() const;
679
680	/// Determine whether this declaration is marked 'deprecated'.
681	///
682	/// \param Message If non-NULL and the declaration is deprecated,
683	/// this will be set to the message describing why the declaration
684	/// was deprecated (which may be empty).
685	bool isDeprecated(std::string Message = nullptr) const* {
686	return getAvailability(Message) == AR_Deprecated;
687	}
688
689	/// Determine whether this declaration is marked 'unavailable'.
690	///
691	/// \param Message If non-NULL and the declaration is unavailable,
692	/// this will be set to the message describing why the declaration
693	/// was made unavailable (which may be empty).
694	bool isUnavailable(std::string Message = nullptr) const* {
695	return getAvailability(Message) == AR_Unavailable;
696	}
697
698	/// Determine whether this is a weak-imported symbol.
699	///
700	/// Weak-imported symbols are typically marked with the
701	/// 'weak_import' attribute, but may also be marked with an
702	/// 'availability' attribute where we're targing a platform prior to
703	/// the introduction of this feature.
704	bool isWeakImported() const;
705
706	/// Determines whether this symbol can be weak-imported,
707	/// e.g., whether it would be well-formed to add the weak_import
708	/// attribute.
709	///
710	/// \param IsDefinition Set to \c true to indicate that this
711	/// declaration cannot be weak-imported because it has a definition.
712	bool canBeWeakImported(bool &IsDefinition) const;
713
714	/// Determine whether this declaration came from an AST file (such as
715	/// a precompiled header or module) rather than having been parsed.
716	bool isFromASTFile() const { return FromASTFile; }
717
718	/// Retrieve the global declaration ID associated with this
719	/// declaration, which specifies where this Decl was loaded from.
720	unsigned getGlobalID() const {
721	if (isFromASTFile())
722	return ((const* unsigned)this* - `1`);
723	return `0`;
724	}
725
726	/// Retrieve the global ID of the module that owns this particular
727	/// declaration.
728	unsigned getOwningModuleID() const {
729	if (isFromASTFile())
730	return ((const* unsigned)this* - `2`);
731	return `0`;
732	}
733
734	private:
735	Module getOwningModuleSlow() const*;
736
737	protected:
738	bool hasLocalOwningModuleStorage() const;
739
740	public:
741	/// Get the imported owning module, if this decl is from an imported
742	/// (non-local) module.
743	Module getImportedOwningModule() const* {
744	if (!isFromASTFile() \|\| !hasOwningModule())
745	return nullptr;
746
747	return getOwningModuleSlow();
748	}
749
750	/// Get the local owning module, if known. Returns nullptr if owner is
751	/// not yet known or declaration is not from a module.
752	Module getLocalOwningModule() const* {
753	if (isFromASTFile() \|\| !hasOwningModule())
754	return nullptr;
755
756	assert(hasLocalOwningModuleStorage() &&
757	"owned local decl but no local module storage");
758	return reinterpret_cast<Module *const >(this*)[-`1`];
759	}
760	void setLocalOwningModule(Module *M) {
761	assert(!isFromASTFile() && hasOwningModule() &&
762	hasLocalOwningModuleStorage() &&
763	"should not have a cached owning module");
764	reinterpret_cast<Module >(this**)[-`1`] = M;
765	}
766
767	/// Is this declaration owned by some module?
768	bool hasOwningModule() const {
769	return getModuleOwnershipKind() != ModuleOwnershipKind::Unowned;
770	}
771
772	/// Get the module that owns this declaration (for visibility purposes).
773	Module getOwningModule() const* {
774	return isFromASTFile() ? getImportedOwningModule() : getLocalOwningModule();
775	}
776
777	/// Get the module that owns this declaration for linkage purposes.
778	/// There only ever is such a module under the C++ Modules TS.
779	///
780	/// \param IgnoreLinkage Ignore the linkage of the entity; assume that
781	/// all declarations in a global module fragment are unowned.
782	Module getOwningModuleForLinkage(bool* IgnoreLinkage = false) const;
783
784	/// Determine whether this declaration is definitely visible to name lookup,
785	/// independent of whether the owning module is visible.
786	/// Note: The declaration may be visible even if this returns \c false if the
787	/// owning module is visible within the query context. This is a low-level
788	/// helper function; most code should be calling Sema::isVisible() instead.
789	bool isUnconditionallyVisible() const {
790	return (int)getModuleOwnershipKind() <= (int)ModuleOwnershipKind::Visible;
791	}
792
793	/// Set that this declaration is globally visible, even if it came from a
794	/// module that is not visible.
795	void setVisibleDespiteOwningModule() {
796	if (!isUnconditionallyVisible())
797	setModuleOwnershipKind(ModuleOwnershipKind::Visible);
798	}
799
800	/// Get the kind of module ownership for this declaration.
801	ModuleOwnershipKind getModuleOwnershipKind() const {
802	return NextInContextAndBits.getInt();
803	}
804
805	/// Set whether this declaration is hidden from name lookup.
806	void setModuleOwnershipKind(ModuleOwnershipKind MOK) {
807	assert(!(getModuleOwnershipKind() == ModuleOwnershipKind::Unowned &&
808	MOK != ModuleOwnershipKind::Unowned && !isFromASTFile() &&
809	!hasLocalOwningModuleStorage()) &&
810	"no storage available for owning module for this declaration");
811	NextInContextAndBits.setInt(MOK);
812	}
813
814	unsigned getIdentifierNamespace() const {
815	return IdentifierNamespace;
816	}
817
818	bool isInIdentifierNamespace(unsigned NS) const {
819	return getIdentifierNamespace() & NS;
820	}
821
822	static unsigned getIdentifierNamespaceForKind(Kind DK);
823
824	bool hasTagIdentifierNamespace() const {
825	return isTagIdentifierNamespace(getIdentifierNamespace());
826	}
827
828	static bool isTagIdentifierNamespace(unsigned NS) {
829	// TagDecls have Tag and Type set and may also have TagFriend.
830	return (NS & ~IDNS_TagFriend) == (IDNS_Tag \| IDNS_Type);
831	}
832
833	/// getLexicalDeclContext - The declaration context where this Decl was
834	/// lexically declared (LexicalDC). May be different from
835	/// getDeclContext() (SemanticDC).
836	/// e.g.:
837	///
838	/// namespace A {
839	/// void f(); // SemanticDC == LexicalDC == 'namespace A'
840	/// }
841	/// void A::f(); // SemanticDC == namespace 'A'
842	/// // LexicalDC == global namespace
843	DeclContext *getLexicalDeclContext() {
844	if (isInSemaDC())
845	return getSemanticDC();
846	return getMultipleDC()->LexicalDC;
847	}
848	const DeclContext getLexicalDeclContext() const* {
849	return const_cast<Decl>(this*)->getLexicalDeclContext();
850	}
851
852	/// Determine whether this declaration is declared out of line (outside its
853	/// semantic context).
854	virtual bool isOutOfLine() const;
855
856	/// setDeclContext - Set both the semantic and lexical DeclContext
857	/// to DC.
858	void setDeclContext(DeclContext *DC);
859
860	void setLexicalDeclContext(DeclContext *DC);
861
862	/// Determine whether this declaration is a templated entity (whether it is
863	// within the scope of a template parameter).
864	bool isTemplated() const;
865
866	/// Determine the number of levels of template parameter surrounding this
867	/// declaration.
868	unsigned getTemplateDepth() const;
869
870	/// isDefinedOutsideFunctionOrMethod - This predicate returns true if this
871	/// scoped decl is defined outside the current function or method. This is
872	/// roughly global variables and functions, but also handles enums (which
873	/// could be defined inside or outside a function etc).
874	bool isDefinedOutsideFunctionOrMethod() const {
875	return getParentFunctionOrMethod() == nullptr;
876	}
877
878	/// Determine whether a substitution into this declaration would occur as
879	/// part of a substitution into a dependent local scope. Such a substitution
880	/// transitively substitutes into all constructs nested within this
881	/// declaration.
882	///
883	/// This recognizes non-defining declarations as well as members of local
884	/// classes and lambdas:
885	/// \code
886	/// template<typename T> void foo() { void bar(); }
887	/// template<typename T> void foo2() { class ABC { void bar(); }; }
888	/// template<typename T> inline int x = [](){ return 0; }();
889	/// \endcode
890	bool isInLocalScopeForInstantiation() const;
891
892	/// If this decl is defined inside a function/method/block it returns
893	/// the corresponding DeclContext, otherwise it returns null.
894	const DeclContext getParentFunctionOrMethod() const*;
895	DeclContext *getParentFunctionOrMethod() {
896	return const_cast<DeclContext*>(
897	const_cast<const Decl>(this*)->getParentFunctionOrMethod());
898	}
899
900	/// Retrieves the "canonical" declaration of the given declaration.
901	virtual Decl getCanonicalDecl() { return* this; }
902	const Decl getCanonicalDecl() const* {
903	return const_cast<Decl>(this*)->getCanonicalDecl();
904	}
905
906	/// Whether this particular Decl is a canonical one.
907	bool isCanonicalDecl() const { return getCanonicalDecl() == this; }
908
909	protected:
910	/// Returns the next redeclaration or itself if this is the only decl.
911	///
912	/// Decl subclasses that can be redeclared should override this method so that
913	/// Decl::redecl_iterator can iterate over them.
914	virtual Decl getNextRedeclarationImpl() { return* this; }
915
916	/// Implementation of getPreviousDecl(), to be overridden by any
917	/// subclass that has a redeclaration chain.
918	virtual Decl getPreviousDeclImpl() { return* nullptr; }
919
920	/// Implementation of getMostRecentDecl(), to be overridden by any
921	/// subclass that has a redeclaration chain.
922	virtual Decl getMostRecentDeclImpl() { return* this; }
923
924	public:
925	/// Iterates through all the redeclarations of the same decl.
926	class redecl_iterator {
927	/// Current - The current declaration.
928	Decl Current = nullptr*;
929	Decl *Starter;
930
931	public:
932	using value_type = Decl *;
933	using reference = const value_type &;
934	using pointer = const value_type *;
935	using iterator_category = std::forward_iterator_tag;
936	using difference_type = std::ptrdiff_t;
937
938	redecl_iterator() = default;
939	explicit redecl_iterator(Decl *C) : Current(C), Starter(C) {}
940
941	reference operator() const* { return Current; }
942	value_type operator->() const { return Current; }
943
944	redecl_iterator& operator++() {
945	assert(Current && "Advancing while iterator has reached end");
946	// Get either previous decl or latest decl.
947	Decl *Next = Current->getNextRedeclarationImpl();
948	assert(Next && "Should return next redeclaration or itself, never null!");
949	Current = (Next != Starter) ? Next : nullptr;
950	return *this;
951	}
952
953	redecl_iterator operator++(int) {
954	redecl_iterator tmp(*this);
955	++(*this);
956	return tmp;
957	}
958
959	friend bool operator==(redecl_iterator x, redecl_iterator y) {
960	return x.Current == y.Current;
961	}
962
963	friend bool operator!=(redecl_iterator x, redecl_iterator y) {
964	return x.Current != y.Current;
965	}
966	};
967
968	using redecl_range = llvm::iterator_range<redecl_iterator>;
969
970	/// Returns an iterator range for all the redeclarations of the same
971	/// decl. It will iterate at least once (when this decl is the only one).
972	redecl_range redecls() const {
973	return redecl_range (redecls_begin(), redecls_end());
974	}
975
976	redecl_iterator redecls_begin() const {
977	return redecl_iterator (const_cast<Decl >(this*));
978	}
979
980	redecl_iterator redecls_end() const { return redecl_iterator (); }
981
982	/// Retrieve the previous declaration that declares the same entity
983	/// as this declaration, or NULL if there is no previous declaration.
984	Decl getPreviousDecl() { return* getPreviousDeclImpl(); }
985
986	/// Retrieve the previous declaration that declares the same entity
987	/// as this declaration, or NULL if there is no previous declaration.
988	const Decl getPreviousDecl() const* {
989	return const_cast<Decl >(this*)->getPreviousDeclImpl();
990	}
991
992	/// True if this is the first declaration in its redeclaration chain.
993	bool isFirstDecl() const {
994	return getPreviousDecl() == nullptr;
995	}
996
997	/// Retrieve the most recent declaration that declares the same entity
998	/// as this declaration (which may be this declaration).
999	Decl getMostRecentDecl() { return* getMostRecentDeclImpl(); }
1000
1001	/// Retrieve the most recent declaration that declares the same entity
1002	/// as this declaration (which may be this declaration).
1003	const Decl getMostRecentDecl() const* {
1004	return const_cast<Decl >(this*)->getMostRecentDeclImpl();
1005	}
1006
1007	/// getBody - If this Decl represents a declaration for a body of code,
1008	/// such as a function or method definition, this method returns the
1009	/// top-level Stmt of that body. Otherwise this method returns null.*
1010	virtual Stmt* getBody() const { return nullptr; }
1011
1012	/// Returns true if this \c Decl represents a declaration for a body of
1013	/// code, such as a function or method definition.
1014	/// Note that \c hasBody can also return true if any redeclaration of this
1015	/// \c Decl represents a declaration for a body of code.
1016	virtual bool hasBody() const { return getBody() != nullptr; }
1017
1018	/// getBodyRBrace - Gets the right brace of the body, if a body exists.
1019	/// This works whether the body is a CompoundStmt or a CXXTryStmt.
1020	SourceLocation getBodyRBrace() const;
1021
1022	// global temp stats (until we have a per-module visitor)
1023	static void add(Kind k);
1024	static void EnableStatistics();
1025	static void PrintStats();
1026
1027	/// isTemplateParameter - Determines whether this declaration is a
1028	/// template parameter.
1029	bool isTemplateParameter() const;
1030
1031	/// isTemplateParameter - Determines whether this declaration is a
1032	/// template parameter pack.
1033	bool isTemplateParameterPack() const;
1034
1035	/// Whether this declaration is a parameter pack.
1036	bool isParameterPack() const;
1037
1038	/// returns true if this declaration is a template
1039	bool isTemplateDecl() const;
1040
1041	/// Whether this declaration is a function or function template.
1042	bool isFunctionOrFunctionTemplate() const {
1043	return (DeclKind >= Decl::firstFunction &&
1044	DeclKind <= Decl::lastFunction) \|\|
1045	DeclKind == FunctionTemplate;
1046	}
1047
1048	/// If this is a declaration that describes some template, this
1049	/// method returns that template declaration.
1050	///
1051	/// Note that this returns nullptr for partial specializations, because they
1052	/// are not modeled as TemplateDecls. Use getDescribedTemplateParams to handle
1053	/// those cases.
1054	TemplateDecl getDescribedTemplate() const*;
1055
1056	/// If this is a declaration that describes some template or partial
1057	/// specialization, this returns the corresponding template parameter list.
1058	const TemplateParameterList getDescribedTemplateParams() const*;
1059
1060	/// Returns the function itself, or the templated function if this is a
1061	/// function template.
1062	FunctionDecl *getAsFunction() LLVM_READONLY;
1063
1064	const FunctionDecl getAsFunction() const* {
1065	return const_cast<Decl >(this*)->getAsFunction();
1066	}
1067
1068	/// Changes the namespace of this declaration to reflect that it's
1069	/// a function-local extern declaration.
1070	///
1071	/// These declarations appear in the lexical context of the extern
1072	/// declaration, but in the semantic context of the enclosing namespace
1073	/// scope.
1074	void setLocalExternDecl() {
1075	Decl *Prev = getPreviousDecl();
1076	IdentifierNamespace &= ~IDNS_Ordinary;
1077
1078	// It's OK for the declaration to still have the "invisible friend" flag or
1079	// the "conflicts with tag declarations in this scope" flag for the outer
1080	// scope.
1081	assert((IdentifierNamespace & ~(IDNS_OrdinaryFriend \| IDNS_Tag)) == `0` &&
1082	"namespace is not ordinary");
1083
1084	IdentifierNamespace \|= IDNS_LocalExtern;
1085	if (Prev && Prev->getIdentifierNamespace() & IDNS_Ordinary)
1086	IdentifierNamespace \|= IDNS_Ordinary;
1087	}
1088
1089	/// Determine whether this is a block-scope declaration with linkage.
1090	/// This will either be a local variable declaration declared 'extern', or a
1091	/// local function declaration.
1092	bool isLocalExternDecl() {
1093	return IdentifierNamespace & IDNS_LocalExtern;
1094	}
1095
1096	/// Changes the namespace of this declaration to reflect that it's
1097	/// the object of a friend declaration.
1098	///
1099	/// These declarations appear in the lexical context of the friending
1100	/// class, but in the semantic context of the actual entity. This property
1101	/// applies only to a specific decl object; other redeclarations of the
1102	/// same entity may not (and probably don't) share this property.
1103	void setObjectOfFriendDecl(bool PerformFriendInjection = false) {
1104	unsigned OldNS = IdentifierNamespace;
1105	assert((OldNS & (IDNS_Tag \| IDNS_Ordinary \|
1106	IDNS_TagFriend \| IDNS_OrdinaryFriend \|
1107	IDNS_LocalExtern \| IDNS_NonMemberOperator)) &&
1108	"namespace includes neither ordinary nor tag");
1109	assert(!(OldNS & ~(IDNS_Tag \| IDNS_Ordinary \| IDNS_Type \|
1110	IDNS_TagFriend \| IDNS_OrdinaryFriend \|
1111	IDNS_LocalExtern \| IDNS_NonMemberOperator)) &&
1112	"namespace includes other than ordinary or tag");
1113
1114	Decl *Prev = getPreviousDecl();
1115	IdentifierNamespace &= ~(IDNS_Ordinary \| IDNS_Tag \| IDNS_Type);
1116
1117	if (OldNS & (IDNS_Tag \| IDNS_TagFriend)) {
1118	IdentifierNamespace \|= IDNS_TagFriend;
1119	if (PerformFriendInjection \|\|
1120	(Prev && Prev->getIdentifierNamespace() & IDNS_Tag))
1121	IdentifierNamespace \|= IDNS_Tag \| IDNS_Type;
1122	}
1123
1124	if (OldNS & (IDNS_Ordinary \| IDNS_OrdinaryFriend \|
1125	IDNS_LocalExtern \| IDNS_NonMemberOperator)) {
1126	IdentifierNamespace \|= IDNS_OrdinaryFriend;
1127	if (PerformFriendInjection \|\|
1128	(Prev && Prev->getIdentifierNamespace() & IDNS_Ordinary))
1129	IdentifierNamespace \|= IDNS_Ordinary;
1130	}
1131	}
1132
1133	enum FriendObjectKind {
1134	FOK_None, ///< Not a friend object.
1135	FOK_Declared, ///< A friend of a previously-declared entity.
1136	FOK_Undeclared ///< A friend of a previously-undeclared entity.
1137	};
1138
1139	/// Determines whether this declaration is the object of a
1140	/// friend declaration and, if so, what kind.
1141	///
1142	/// There is currently no direct way to find the associated FriendDecl.
1143	FriendObjectKind getFriendObjectKind() const {
1144	unsigned mask =
1145	(IdentifierNamespace & (IDNS_TagFriend \| IDNS_OrdinaryFriend));
1146	if (!mask) return FOK_None;
1147	return (IdentifierNamespace & (IDNS_Tag \| IDNS_Ordinary) ? FOK_Declared
1148	: FOK_Undeclared);
1149	}
1150
1151	/// Specifies that this declaration is a C++ overloaded non-member.
1152	void setNonMemberOperator() {
1153	assert(getKind() == Function \|\| getKind() == FunctionTemplate);
1154	assert((IdentifierNamespace & IDNS_Ordinary) &&
1155	"visible non-member operators should be in ordinary namespace");
1156	IdentifierNamespace \|= IDNS_NonMemberOperator;
1157	}
1158
1159	static bool classofKind(Kind K) { return true; }
1160	static DeclContext castToDeclContext(const* Decl *);
1161	static Decl castFromDeclContext(const* DeclContext *);
1162
1163	void print(raw_ostream &Out, unsigned Indentation = `0`,
1164	bool PrintInstantiation = false) const;
1165	void print(raw_ostream &Out, const PrintingPolicy &Policy,
1166	unsigned Indentation = `0`, bool PrintInstantiation = false) const;
1167	static void printGroup(Decl** Begin, unsigned NumDecls,
1168	raw_ostream &Out, const PrintingPolicy &Policy,
1169	unsigned Indentation = `0`);
1170
1171	// Debuggers don't usually respect default arguments.
1172	void dump() const;
1173
1174	// Same as dump(), but forces color printing.
1175	void dumpColor() const;
1176
1177	void dump(raw_ostream &Out, bool Deserialize = false,
1178	ASTDumpOutputFormat OutputFormat = ADOF_Default) const;
1179
1180	/// \return Unique reproducible object identifier
1181	int64_t getID() const;
1182
1183	/// Looks through the Decl's underlying type to extract a FunctionType
1184	/// when possible. Will return null if the type underlying the Decl does not
1185	/// have a FunctionType.
1186	const FunctionType getFunctionType(bool* BlocksToo = true) const;
1187
1188	private:
1189	void setAttrsImpl(const AttrVec& Attrs, ASTContext &Ctx);
1190	void setDeclContextsImpl(DeclContext SemaDC, DeclContext LexicalDC,
1191	ASTContext &Ctx);
1192
1193	protected:
1194	ASTMutationListener getASTMutationListener() const*;
1195	};
1196
1197	/// Determine whether two declarations declare the same entity.
1198	inline bool declaresSameEntity(const Decl D1, const* Decl *D2) {
1199	if (!D1 \|\| !D2)
1200	return false;
1201
1202	if (D1 == D2)
1203	return true;
1204
1205	return D1->getCanonicalDecl() == D2->getCanonicalDecl();
1206	}
1207
1208	/// PrettyStackTraceDecl - If a crash occurs, indicate that it happened when
1209	/// doing something to a specific decl.
1210	class PrettyStackTraceDecl : public llvm::PrettyStackTraceEntry {
1211	const Decl *TheDecl;
1212	SourceLocation Loc;
1213	SourceManager &SM;
1214	const char *Message;
1215
1216	public:
1217	PrettyStackTraceDecl(const Decl *theDecl, SourceLocation L,
1218	SourceManager &sm, const char *Msg)
1219	: TheDecl(theDecl), Loc (L), SM(sm), Message(Msg) {}
1220
1221	void print(raw_ostream &OS) const override;
1222	};
1223	} // namespace clang
1224
1225	// Required to determine the layout of the PointerUnion<NamedDecl> before*
1226	// seeing the NamedDecl definition being first used in DeclListNode::operator.*
1227	namespace llvm {
1228	template <> struct PointerLikeTypeTraits<::clang::NamedDecl *> {
1229	static inline void getAsVoidPointer(::clang::NamedDecl P) { return P; }
1230	static inline ::clang::NamedDecl getFromVoidPointer(void* *P) {
1231	return static_cast<::clang::NamedDecl *>(P);
1232	}
1233	static constexpr int NumLowBitsAvailable = `3`;
1234	};
1235	}
1236
1237	namespace clang {
1238	/// A list storing NamedDecls in the lookup tables.
1239	class DeclListNode {
1240	friend class ASTContext; // allocate, deallocate nodes.
1241	friend class StoredDeclsList;
1242	public:
1243	using Decls = llvm::PointerUnion<NamedDecl, DeclListNode>;
1244	class iterator {
1245	friend class DeclContextLookupResult;
1246	friend class StoredDeclsList;
1247
1248	Decls Ptr;
1249	iterator(Decls Node) : Ptr (Node) { }
1250	public:
1251	using difference_type = ptrdiff_t;
1252	using value_type = NamedDecl*;
1253	using pointer = void;
1254	using reference = value_type;
1255	using iterator_category = std::forward_iterator_tag;
1256
1257	iterator() = default;
1258
1259	reference operator() const* {
1260	assert(Ptr && "dereferencing end() iterator");
1261	if (DeclListNode CurNode = Ptr.dyn_cast<DeclListNode>())
1262	return CurNode->D;
1263	return Ptr.get<NamedDecl*>();
1264	}
1265	void operator->() const { } // Unsupported.
1266	bool operator==(const iterator &X) const { return Ptr == X.Ptr; }
1267	bool operator!=(const iterator &X) const { return Ptr != X.Ptr; }
1268	inline iterator &operator++() { // ++It
1269	assert(!Ptr.isNull() && "Advancing empty iterator");
1270
1271	if (DeclListNode CurNode = Ptr.dyn_cast<DeclListNode>())
1272	Ptr = CurNode->Rest;
1273	else
1274	Ptr = nullptr;
1275	return *this;
1276	}
1277	iterator operator++(int) { // It++
1278	iterator temp = *this;
1279	++(*this);
1280	return temp;
1281	}
1282	// Enables the pattern for (iterator I =..., E = I.end(); I != E; ++I)
1283	iterator end() { return iterator (); }
1284	};
1285	private:
1286	NamedDecl D = nullptr*;
1287	Decls Rest = nullptr;
1288	DeclListNode(NamedDecl *ND) : D(ND) {}
1289	};
1290
1291	/// The results of name lookup within a DeclContext.
1292	class DeclContextLookupResult {
1293	using Decls = DeclListNode::Decls;
1294
1295	/// When in collection form, this is what the Data pointer points to.
1296	Decls Result;
1297
1298	public:
1299	DeclContextLookupResult() = default;
1300	DeclContextLookupResult(Decls Result) : Result (Result) {}
1301
1302	using iterator = DeclListNode::iterator;
1303	using const_iterator = iterator;
1304	using reference = iterator::reference;
1305
1306	iterator begin() { return iterator (Result); }
1307	iterator end() { return iterator (); }
1308	const_iterator begin() const {
1309	return const_cast<DeclContextLookupResult>(this*)->begin();
1310	}
1311	const_iterator end() const { return iterator (); }
1312
1313	bool empty() const { return Result.isNull(); }
1314	bool isSingleResult() const { return Result.dyn_cast<NamedDecl*>(); }
1315	reference front() const { return *begin(); }
1316
1317	// Find the first declaration of the given type in the list. Note that this
1318	// is not in general the earliest-declared declaration, and should only be
1319	// used when it's not possible for there to be more than one match or where
1320	// it doesn't matter which one is found.
1321	template<class T> T find_first() const* {
1322	for (auto D : this)
1323	if (T *Decl = dyn_cast<T>(D))
1324	return Decl;
1325
1326	return nullptr;
1327	}
1328	};
1329
1330	/// DeclContext - This is used only as base class of specific decl types that
1331	/// can act as declaration contexts. These decls are (only the top classes
1332	/// that directly derive from DeclContext are mentioned, not their subclasses):
1333	///
1334	/// TranslationUnitDecl
1335	/// ExternCContext
1336	/// NamespaceDecl
1337	/// TagDecl
1338	/// OMPDeclareReductionDecl
1339	/// OMPDeclareMapperDecl
1340	/// FunctionDecl
1341	/// ObjCMethodDecl
1342	/// ObjCContainerDecl
1343	/// LinkageSpecDecl
1344	/// ExportDecl
1345	/// BlockDecl
1346	/// CapturedDecl
1347	class DeclContext {
1348	/// For makeDeclVisibleInContextImpl
1349	friend class ASTDeclReader;
1350	/// For reconcileExternalVisibleStorage, CreateStoredDeclsMap,
1351	/// hasNeedToReconcileExternalVisibleStorage
1352	friend class ExternalASTSource;
1353	/// For CreateStoredDeclsMap
1354	friend class DependentDiagnostic;
1355	/// For hasNeedToReconcileExternalVisibleStorage,
1356	/// hasLazyLocalLexicalLookups, hasLazyExternalLexicalLookups
1357	friend class ASTWriter;
1358
1359	// We use uint64_t in the bit-fields below since some bit-fields
1360	// cross the unsigned boundary and this breaks the packing.
1361
1362	/// Stores the bits used by DeclContext.
1363	/// If modified NumDeclContextBit, the ctor of DeclContext and the accessor
1364	/// methods in DeclContext should be updated appropriately.
1365	class DeclContextBitfields {
1366	friend class DeclContext;
1367	/// DeclKind - This indicates which class this is.
1368	uint64_t DeclKind : `7`;
1369
1370	/// Whether this declaration context also has some external
1371	/// storage that contains additional declarations that are lexically
1372	/// part of this context.
1373	mutable uint64_t ExternalLexicalStorage : `1`;
1374
1375	/// Whether this declaration context also has some external
1376	/// storage that contains additional declarations that are visible
1377	/// in this context.
1378	mutable uint64_t ExternalVisibleStorage : `1`;
1379
1380	/// Whether this declaration context has had externally visible
1381	/// storage added since the last lookup. In this case, \c LookupPtr's
1382	/// invariant may not hold and needs to be fixed before we perform
1383	/// another lookup.
1384	mutable uint64_t NeedToReconcileExternalVisibleStorage : `1`;
1385
1386	/// If \c true, this context may have local lexical declarations
1387	/// that are missing from the lookup table.
1388	mutable uint64_t HasLazyLocalLexicalLookups : `1`;
1389
1390	/// If \c true, the external source may have lexical declarations
1391	/// that are missing from the lookup table.
1392	mutable uint64_t HasLazyExternalLexicalLookups : `1`;
1393
1394	/// If \c true, lookups should only return identifier from
1395	/// DeclContext scope (for example TranslationUnit). Used in
1396	/// LookupQualifiedName()
1397	mutable uint64_t UseQualifiedLookup : `1`;
1398	};
1399
1400	/// Number of bits in DeclContextBitfields.
1401	enum { NumDeclContextBits = `13` };
1402
1403	/// Stores the bits used by TagDecl.
1404	/// If modified NumTagDeclBits and the accessor
1405	/// methods in TagDecl should be updated appropriately.
1406	class TagDeclBitfields {
1407	friend class TagDecl;
1408	/// For the bits in DeclContextBitfields
1409	uint64_t : NumDeclContextBits;
1410
1411	/// The TagKind enum.
1412	uint64_t TagDeclKind : `3`;
1413
1414	/// True if this is a definition ("struct foo {};"), false if it is a
1415	/// declaration ("struct foo;"). It is not considered a definition
1416	/// until the definition has been fully processed.
1417	uint64_t IsCompleteDefinition : `1`;
1418
1419	/// True if this is currently being defined.
1420	uint64_t IsBeingDefined : `1`;
1421
1422	/// True if this tag declaration is "embedded" (i.e., defined or declared
1423	/// for the very first time) in the syntax of a declarator.
1424	uint64_t IsEmbeddedInDeclarator : `1`;
1425
1426	/// True if this tag is free standing, e.g. "struct foo;".
1427	uint64_t IsFreeStanding : `1`;
1428
1429	/// Indicates whether it is possible for declarations of this kind
1430	/// to have an out-of-date definition.
1431	///
1432	/// This option is only enabled when modules are enabled.
1433	uint64_t MayHaveOutOfDateDef : `1`;
1434
1435	/// Has the full definition of this type been required by a use somewhere in
1436	/// the TU.
1437	uint64_t IsCompleteDefinitionRequired : `1`;
1438	};
1439
1440	/// Number of non-inherited bits in TagDeclBitfields.
1441	enum { NumTagDeclBits = `9` };
1442
1443	/// Stores the bits used by EnumDecl.
1444	/// If modified NumEnumDeclBit and the accessor
1445	/// methods in EnumDecl should be updated appropriately.
1446	class EnumDeclBitfields {
1447	friend class EnumDecl;
1448	/// For the bits in DeclContextBitfields.
1449	uint64_t : NumDeclContextBits;
1450	/// For the bits in TagDeclBitfields.
1451	uint64_t : NumTagDeclBits;
1452
1453	/// Width in bits required to store all the non-negative
1454	/// enumerators of this enum.
1455	uint64_t NumPositiveBits : `8`;
1456
1457	/// Width in bits required to store all the negative
1458	/// enumerators of this enum.
1459	uint64_t NumNegativeBits : `8`;
1460
1461	/// True if this tag declaration is a scoped enumeration. Only
1462	/// possible in C++11 mode.
1463	uint64_t IsScoped : `1`;
1464
1465	/// If this tag declaration is a scoped enum,
1466	/// then this is true if the scoped enum was declared using the class
1467	/// tag, false if it was declared with the struct tag. No meaning is
1468	/// associated if this tag declaration is not a scoped enum.
1469	uint64_t IsScopedUsingClassTag : `1`;
1470
1471	/// True if this is an enumeration with fixed underlying type. Only
1472	/// possible in C++11, Microsoft extensions, or Objective C mode.
1473	uint64_t IsFixed : `1`;
1474
1475	/// True if a valid hash is stored in ODRHash.
1476	uint64_t HasODRHash : `1`;
1477	};
1478
1479	/// Number of non-inherited bits in EnumDeclBitfields.
1480	enum { NumEnumDeclBits = `20` };
1481
1482	/// Stores the bits used by RecordDecl.
1483	/// If modified NumRecordDeclBits and the accessor
1484	/// methods in RecordDecl should be updated appropriately.
1485	class RecordDeclBitfields {
1486	friend class RecordDecl;
1487	/// For the bits in DeclContextBitfields.
1488	uint64_t : NumDeclContextBits;
1489	/// For the bits in TagDeclBitfields.
1490	uint64_t : NumTagDeclBits;
1491
1492	/// This is true if this struct ends with a flexible
1493	/// array member (e.g. int X[]) or if this union contains a struct that does.
1494	/// If so, this cannot be contained in arrays or other structs as a member.
1495	uint64_t HasFlexibleArrayMember : `1`;
1496
1497	/// Whether this is the type of an anonymous struct or union.
1498	uint64_t AnonymousStructOrUnion : `1`;
1499
1500	/// This is true if this struct has at least one member
1501	/// containing an Objective-C object pointer type.
1502	uint64_t HasObjectMember : `1`;
1503
1504	/// This is true if struct has at least one member of
1505	/// 'volatile' type.
1506	uint64_t HasVolatileMember : `1`;
1507
1508	/// Whether the field declarations of this record have been loaded
1509	/// from external storage. To avoid unnecessary deserialization of
1510	/// methods/nested types we allow deserialization of just the fields
1511	/// when needed.
1512	mutable uint64_t LoadedFieldsFromExternalStorage : `1`;
1513
1514	/// Basic properties of non-trivial C structs.
1515	uint64_t NonTrivialToPrimitiveDefaultInitialize : `1`;
1516	uint64_t NonTrivialToPrimitiveCopy : `1`;
1517	uint64_t NonTrivialToPrimitiveDestroy : `1`;
1518
1519	/// The following bits indicate whether this is or contains a C union that
1520	/// is non-trivial to default-initialize, destruct, or copy. These bits
1521	/// imply the associated basic non-triviality predicates declared above.
1522	uint64_t HasNonTrivialToPrimitiveDefaultInitializeCUnion : `1`;
1523	uint64_t HasNonTrivialToPrimitiveDestructCUnion : `1`;
1524	uint64_t HasNonTrivialToPrimitiveCopyCUnion : `1`;
1525
1526	/// Indicates whether this struct is destroyed in the callee.
1527	uint64_t ParamDestroyedInCallee : `1`;
1528
1529	/// Represents the way this type is passed to a function.
1530	uint64_t ArgPassingRestrictions : `2`;
1531	};
1532
1533	/// Number of non-inherited bits in RecordDeclBitfields.
1534	enum { NumRecordDeclBits = `14` };
1535
1536	/// Stores the bits used by OMPDeclareReductionDecl.
1537	/// If modified NumOMPDeclareReductionDeclBits and the accessor
1538	/// methods in OMPDeclareReductionDecl should be updated appropriately.
1539	class OMPDeclareReductionDeclBitfields {
1540	friend class OMPDeclareReductionDecl;
1541	/// For the bits in DeclContextBitfields
1542	uint64_t : NumDeclContextBits;
1543
1544	/// Kind of initializer,
1545	/// function call or omp_priv<init_expr> initializtion.
1546	uint64_t InitializerKind : `2`;
1547	};
1548
1549	/// Number of non-inherited bits in OMPDeclareReductionDeclBitfields.
1550	enum { NumOMPDeclareReductionDeclBits = `2` };
1551
1552	/// Stores the bits used by FunctionDecl.
1553	/// If modified NumFunctionDeclBits and the accessor
1554	/// methods in FunctionDecl and CXXDeductionGuideDecl
1555	/// (for IsCopyDeductionCandidate) should be updated appropriately.
1556	class FunctionDeclBitfields {
1557	friend class FunctionDecl;
1558	/// For IsCopyDeductionCandidate
1559	friend class CXXDeductionGuideDecl;
1560	/// For the bits in DeclContextBitfields.
1561	uint64_t : NumDeclContextBits;
1562
1563	uint64_t SClass : `3`;
1564	uint64_t IsInline : `1`;
1565	uint64_t IsInlineSpecified : `1`;
1566
1567	uint64_t IsVirtualAsWritten : `1`;
1568	uint64_t IsPure : `1`;
1569	uint64_t HasInheritedPrototype : `1`;
1570	uint64_t HasWrittenPrototype : `1`;
1571	uint64_t IsDeleted : `1`;
1572	/// Used by CXXMethodDecl
1573	uint64_t IsTrivial : `1`;
1574
1575	/// This flag indicates whether this function is trivial for the purpose of
1576	/// calls. This is meaningful only when this function is a copy/move
1577	/// constructor or a destructor.
1578	uint64_t IsTrivialForCall : `1`;
1579
1580	uint64_t IsDefaulted : `1`;
1581	uint64_t IsExplicitlyDefaulted : `1`;
1582	uint64_t HasDefaultedFunctionInfo : `1`;
1583	uint64_t HasImplicitReturnZero : `1`;
1584	uint64_t IsLateTemplateParsed : `1`;
1585
1586	/// Kind of contexpr specifier as defined by ConstexprSpecKind.
1587	uint64_t ConstexprKind : `2`;
1588	uint64_t InstantiationIsPending : `1`;
1589
1590	/// Indicates if the function uses __try.
1591	uint64_t UsesSEHTry : `1`;
1592
1593	/// Indicates if the function was a definition
1594	/// but its body was skipped.
1595	uint64_t HasSkippedBody : `1`;
1596
1597	/// Indicates if the function declaration will
1598	/// have a body, once we're done parsing it.
1599	uint64_t WillHaveBody : `1`;
1600
1601	/// Indicates that this function is a multiversioned
1602	/// function using attribute 'target'.
1603	uint64_t IsMultiVersion : `1`;
1604
1605	/// [C++17] Only used by CXXDeductionGuideDecl. Indicates that
1606	/// the Deduction Guide is the implicitly generated 'copy
1607	/// deduction candidate' (is used during overload resolution).
1608	uint64_t IsCopyDeductionCandidate : `1`;
1609
1610	/// Store the ODRHash after first calculation.
1611	uint64_t HasODRHash : `1`;
1612
1613	/// Indicates if the function uses Floating Point Constrained Intrinsics
1614	uint64_t UsesFPIntrin : `1`;
1615	};
1616
1617	/// Number of non-inherited bits in FunctionDeclBitfields.
1618	enum { NumFunctionDeclBits = `27` };
1619
1620	/// Stores the bits used by CXXConstructorDecl. If modified
1621	/// NumCXXConstructorDeclBits and the accessor
1622	/// methods in CXXConstructorDecl should be updated appropriately.
1623	class CXXConstructorDeclBitfields {
1624	friend class CXXConstructorDecl;
1625	/// For the bits in DeclContextBitfields.
1626	uint64_t : NumDeclContextBits;
1627	/// For the bits in FunctionDeclBitfields.
1628	uint64_t : NumFunctionDeclBits;
1629
1630	/// 24 bits to fit in the remaining available space.
1631	/// Note that this makes CXXConstructorDeclBitfields take
1632	/// exactly 64 bits and thus the width of NumCtorInitializers
1633	/// will need to be shrunk if some bit is added to NumDeclContextBitfields,
1634	/// NumFunctionDeclBitfields or CXXConstructorDeclBitfields.
1635	uint64_t NumCtorInitializers : `21`;
1636	uint64_t IsInheritingConstructor : `1`;
1637
1638	/// Whether this constructor has a trail-allocated explicit specifier.
1639	uint64_t HasTrailingExplicitSpecifier : `1`;
1640	/// If this constructor does't have a trail-allocated explicit specifier.
1641	/// Whether this constructor is explicit specified.
1642	uint64_t IsSimpleExplicit : `1`;
1643	};
1644
1645	/// Number of non-inherited bits in CXXConstructorDeclBitfields.
1646	enum {
1647	NumCXXConstructorDeclBits = `64` - NumDeclContextBits - NumFunctionDeclBits
1648	};
1649
1650	/// Stores the bits used by ObjCMethodDecl.
1651	/// If modified NumObjCMethodDeclBits and the accessor
1652	/// methods in ObjCMethodDecl should be updated appropriately.
1653	class ObjCMethodDeclBitfields {
1654	friend class ObjCMethodDecl;
1655
1656	/// For the bits in DeclContextBitfields.
1657	uint64_t : NumDeclContextBits;
1658
1659	/// The conventional meaning of this method; an ObjCMethodFamily.
1660	/// This is not serialized; instead, it is computed on demand and
1661	/// cached.
1662	mutable uint64_t Family : ObjCMethodFamilyBitWidth;
1663
1664	/// instance (true) or class (false) method.
1665	uint64_t IsInstance : `1`;
1666	uint64_t IsVariadic : `1`;
1667
1668	/// True if this method is the getter or setter for an explicit property.
1669	uint64_t IsPropertyAccessor : `1`;
1670
1671	/// True if this method is a synthesized property accessor stub.
1672	uint64_t IsSynthesizedAccessorStub : `1`;
1673
1674	/// Method has a definition.
1675	uint64_t IsDefined : `1`;
1676
1677	/// Method redeclaration in the same interface.
1678	uint64_t IsRedeclaration : `1`;
1679
1680	/// Is redeclared in the same interface.
1681	mutable uint64_t HasRedeclaration : `1`;
1682
1683	/// \@required/\@optional
1684	uint64_t DeclImplementation : `2`;
1685
1686	/// in, inout, etc.
1687	uint64_t objcDeclQualifier : `7`;
1688
1689	/// Indicates whether this method has a related result type.
1690	uint64_t RelatedResultType : `1`;
1691
1692	/// Whether the locations of the selector identifiers are in a
1693	/// "standard" position, a enum SelectorLocationsKind.
1694	uint64_t SelLocsKind : `2`;
1695
1696	/// Whether this method overrides any other in the class hierarchy.
1697	///
1698	/// A method is said to override any method in the class's
1699	/// base classes, its protocols, or its categories' protocols, that has
1700	/// the same selector and is of the same kind (class or instance).
1701	/// A method in an implementation is not considered as overriding the same
1702	/// method in the interface or its categories.
1703	uint64_t IsOverriding : `1`;
1704
1705	/// Indicates if the method was a definition but its body was skipped.
1706	uint64_t HasSkippedBody : `1`;
1707	};
1708
1709	/// Number of non-inherited bits in ObjCMethodDeclBitfields.
1710	enum { NumObjCMethodDeclBits = `24` };
1711
1712	/// Stores the bits used by ObjCContainerDecl.
1713	/// If modified NumObjCContainerDeclBits and the accessor
1714	/// methods in ObjCContainerDecl should be updated appropriately.
1715	class ObjCContainerDeclBitfields {
1716	friend class ObjCContainerDecl;
1717	/// For the bits in DeclContextBitfields
1718	uint32_t : NumDeclContextBits;
1719
1720	// Not a bitfield but this saves space.
1721	// Note that ObjCContainerDeclBitfields is full.
1722	SourceLocation AtStart;
1723	};
1724
1725	/// Number of non-inherited bits in ObjCContainerDeclBitfields.
1726	/// Note that here we rely on the fact that SourceLocation is 32 bits
1727	/// wide. We check this with the static_assert in the ctor of DeclContext.
1728	enum { NumObjCContainerDeclBits = `64` - NumDeclContextBits };
1729
1730	/// Stores the bits used by LinkageSpecDecl.
1731	/// If modified NumLinkageSpecDeclBits and the accessor
1732	/// methods in LinkageSpecDecl should be updated appropriately.
1733	class LinkageSpecDeclBitfields {
1734	friend class LinkageSpecDecl;
1735	/// For the bits in DeclContextBitfields.
1736	uint64_t : NumDeclContextBits;
1737
1738	/// The language for this linkage specification with values
1739	/// in the enum LinkageSpecDecl::LanguageIDs.
1740	uint64_t Language : `3`;
1741
1742	/// True if this linkage spec has braces.
1743	/// This is needed so that hasBraces() returns the correct result while the
1744	/// linkage spec body is being parsed. Once RBraceLoc has been set this is
1745	/// not used, so it doesn't need to be serialized.
1746	uint64_t HasBraces : `1`;
1747	};
1748
1749	/// Number of non-inherited bits in LinkageSpecDeclBitfields.
1750	enum { NumLinkageSpecDeclBits = `4` };
1751
1752	/// Stores the bits used by BlockDecl.
1753	/// If modified NumBlockDeclBits and the accessor
1754	/// methods in BlockDecl should be updated appropriately.
1755	class BlockDeclBitfields {
1756	friend class BlockDecl;
1757	/// For the bits in DeclContextBitfields.
1758	uint64_t : NumDeclContextBits;
1759
1760	uint64_t IsVariadic : `1`;
1761	uint64_t CapturesCXXThis : `1`;
1762	uint64_t BlockMissingReturnType : `1`;
1763	uint64_t IsConversionFromLambda : `1`;
1764
1765	/// A bit that indicates this block is passed directly to a function as a
1766	/// non-escaping parameter.
1767	uint64_t DoesNotEscape : `1`;
1768
1769	/// A bit that indicates whether it's possible to avoid coying this block to
1770	/// the heap when it initializes or is assigned to a local variable with
1771	/// automatic storage.
1772	uint64_t CanAvoidCopyToHeap : `1`;
1773	};
1774
1775	/// Number of non-inherited bits in BlockDeclBitfields.
1776	enum { NumBlockDeclBits = `5` };
1777
1778	/// Pointer to the data structure used to lookup declarations
1779	/// within this context (or a DependentStoredDeclsMap if this is a
1780	/// dependent context). We maintain the invariant that, if the map
1781	/// contains an entry for a DeclarationName (and we haven't lazily
1782	/// omitted anything), then it contains all relevant entries for that
1783	/// name (modulo the hasExternalDecls() flag).
1784	mutable StoredDeclsMap LookupPtr = nullptr*;
1785
1786	protected:
1787	/// This anonymous union stores the bits belonging to DeclContext and classes
1788	/// deriving from it. The goal is to use otherwise wasted
1789	/// space in DeclContext to store data belonging to derived classes.
1790	/// The space saved is especially significient when pointers are aligned
1791	/// to 8 bytes. In this case due to alignment requirements we have a
1792	/// little less than 8 bytes free in DeclContext which we can use.
1793	/// We check that none of the classes in this union is larger than
1794	/// 8 bytes with static_asserts in the ctor of DeclContext.
1795	union {
1796	DeclContextBitfields DeclContextBits;
1797	TagDeclBitfields TagDeclBits;
1798	EnumDeclBitfields EnumDeclBits;
1799	RecordDeclBitfields RecordDeclBits;
1800	OMPDeclareReductionDeclBitfields OMPDeclareReductionDeclBits;
1801	FunctionDeclBitfields FunctionDeclBits;
1802	CXXConstructorDeclBitfields CXXConstructorDeclBits;
1803	ObjCMethodDeclBitfields ObjCMethodDeclBits;
1804	ObjCContainerDeclBitfields ObjCContainerDeclBits;
1805	LinkageSpecDeclBitfields LinkageSpecDeclBits;
1806	BlockDeclBitfields BlockDeclBits;
1807
1808	static_assert(sizeof(DeclContextBitfields) <= `8`,
1809	"DeclContextBitfields is larger than 8 bytes!");
1810	static_assert(sizeof(TagDeclBitfields) <= `8`,
1811	"TagDeclBitfields is larger than 8 bytes!");
1812	static_assert(sizeof(EnumDeclBitfields) <= `8`,
1813	"EnumDeclBitfields is larger than 8 bytes!");
1814	static_assert(sizeof(RecordDeclBitfields) <= `8`,
1815	"RecordDeclBitfields is larger than 8 bytes!");
1816	static_assert(sizeof(OMPDeclareReductionDeclBitfields) <= `8`,
1817	"OMPDeclareReductionDeclBitfields is larger than 8 bytes!");
1818	static_assert(sizeof(FunctionDeclBitfields) <= `8`,
1819	"FunctionDeclBitfields is larger than 8 bytes!");
1820	static_assert(sizeof(CXXConstructorDeclBitfields) <= `8`,
1821	"CXXConstructorDeclBitfields is larger than 8 bytes!");
1822	static_assert(sizeof(ObjCMethodDeclBitfields) <= `8`,
1823	"ObjCMethodDeclBitfields is larger than 8 bytes!");
1824	static_assert(sizeof(ObjCContainerDeclBitfields) <= `8`,
1825	"ObjCContainerDeclBitfields is larger than 8 bytes!");
1826	static_assert(sizeof(LinkageSpecDeclBitfields) <= `8`,
1827	"LinkageSpecDeclBitfields is larger than 8 bytes!");
1828	static_assert(sizeof(BlockDeclBitfields) <= `8`,
1829	"BlockDeclBitfields is larger than 8 bytes!");
1830	};
1831
1832	/// FirstDecl - The first declaration stored within this declaration
1833	/// context.
1834	mutable Decl FirstDecl = nullptr*;
1835
1836	/// LastDecl - The last declaration stored within this declaration
1837	/// context. FIXME: We could probably cache this value somewhere
1838	/// outside of the DeclContext, to reduce the size of DeclContext by
1839	/// another pointer.
1840	mutable Decl LastDecl = nullptr*;
1841
1842	/// Build up a chain of declarations.
1843	///
1844	/// \returns the first/last pair of declarations.
1845	static std::pair<Decl , Decl >
1846	BuildDeclChain(ArrayRef<Decl> Decls, bool* FieldsAlreadyLoaded);
1847
1848	DeclContext(Decl::Kind K);
1849
1850	public:
1851	~DeclContext();
1852
1853	Decl::Kind getDeclKind() const {
1854	return static_cast<Decl::Kind>(DeclContextBits.DeclKind);
1855	}
1856
1857	const char getDeclKindName() const*;
1858
1859	/// getParent - Returns the containing DeclContext.
1860	DeclContext *getParent() {
1861	return cast<Decl>(this)->getDeclContext();
1862	}
1863	const DeclContext getParent() const* {
1864	return const_cast<DeclContext>(this*)->getParent();
1865	}
1866
1867	/// getLexicalParent - Returns the containing lexical DeclContext. May be
1868	/// different from getParent, e.g.:
1869	///
1870	/// namespace A {
1871	/// struct S;
1872	/// }
1873	/// struct A::S {}; // getParent() == namespace 'A'
1874	/// // getLexicalParent() == translation unit
1875	///
1876	DeclContext *getLexicalParent() {
1877	return cast<Decl>(this)->getLexicalDeclContext();
1878	}
1879	const DeclContext getLexicalParent() const* {
1880	return const_cast<DeclContext>(this*)->getLexicalParent();
1881	}
1882
1883	DeclContext *getLookupParent();
1884
1885	const DeclContext getLookupParent() const* {
1886	return const_cast<DeclContext>(this*)->getLookupParent();
1887	}
1888
1889	ASTContext &getParentASTContext() const {
1890	return cast<Decl>(this)->getASTContext();
1891	}
1892
1893	bool isClosure() const { return getDeclKind() == Decl::Block; }
1894
1895	/// Return this DeclContext if it is a BlockDecl. Otherwise, return the
1896	/// innermost enclosing BlockDecl or null if there are no enclosing blocks.
1897	const BlockDecl getInnermostBlockDecl() const*;
1898
1899	bool isObjCContainer() const {
1900	switch (getDeclKind()) {
1901	case Decl::ObjCCategory:
1902	case Decl::ObjCCategoryImpl:
1903	case Decl::ObjCImplementation:
1904	case Decl::ObjCInterface:
1905	case Decl::ObjCProtocol:
1906	return true;
1907	default:
1908	return false;
1909	}
1910	}
1911
1912	bool isFunctionOrMethod() const {
1913	switch (getDeclKind()) {
1914	case Decl::Block:
1915	case Decl::Captured:
1916	case Decl::ObjCMethod:
1917	return true;
1918	default:
1919	return getDeclKind() >= Decl::firstFunction &&
1920	getDeclKind() <= Decl::lastFunction;
1921	}
1922	}
1923
1924	/// Test whether the context supports looking up names.
1925	bool isLookupContext() const {
1926	return !isFunctionOrMethod() && getDeclKind() != Decl::LinkageSpec &&
1927	getDeclKind() != Decl::Export;
1928	}
1929
1930	bool isFileContext() const {
1931	return getDeclKind() == Decl::TranslationUnit \|\|
1932	getDeclKind() == Decl::Namespace;
1933	}
1934
1935	bool isTranslationUnit() const {
1936	return getDeclKind() == Decl::TranslationUnit;
1937	}
1938
1939	bool isRecord() const {
1940	return getDeclKind() >= Decl::firstRecord &&
1941	getDeclKind() <= Decl::lastRecord;
1942	}
1943
1944	bool isNamespace() const { return getDeclKind() == Decl::Namespace; }
1945
1946	bool isStdNamespace() const;
1947
1948	bool isInlineNamespace() const;
1949
1950	/// Determines whether this context is dependent on a
1951	/// template parameter.
1952	bool isDependentContext() const;
1953
1954	/// isTransparentContext - Determines whether this context is a
1955	/// "transparent" context, meaning that the members declared in this
1956	/// context are semantically declared in the nearest enclosing
1957	/// non-transparent (opaque) context but are lexically declared in
1958	/// this context. For example, consider the enumerators of an
1959	/// enumeration type:
1960	/// @code
1961	/// enum E {
1962	/// Val1
1963	/// };
1964	/// @endcode
1965	/// Here, E is a transparent context, so its enumerator (Val1) will
1966	/// appear (semantically) that it is in the same context of E.
1967	/// Examples of transparent contexts include: enumerations (except for
1968	/// C++0x scoped enums), and C++ linkage specifications.
1969	bool isTransparentContext() const;
1970
1971	/// Determines whether this context or some of its ancestors is a
1972	/// linkage specification context that specifies C linkage.
1973	bool isExternCContext() const;
1974
1975	/// Retrieve the nearest enclosing C linkage specification context.
1976	const LinkageSpecDecl getExternCContext() const*;
1977
1978	/// Determines whether this context or some of its ancestors is a
1979	/// linkage specification context that specifies C++ linkage.
1980	bool isExternCXXContext() const;
1981
1982	/// Determine whether this declaration context is equivalent
1983	/// to the declaration context DC.
1984	bool Equals(const DeclContext DC) const* {
1985	return DC && this->getPrimaryContext() == DC->getPrimaryContext();
1986	}
1987
1988	/// Determine whether this declaration context encloses the
1989	/// declaration context DC.
1990	bool Encloses(const DeclContext DC) const*;
1991
1992	/// Find the nearest non-closure ancestor of this context,
1993	/// i.e. the innermost semantic parent of this context which is not
1994	/// a closure. A context may be its own non-closure ancestor.
1995	Decl *getNonClosureAncestor();
1996	const Decl getNonClosureAncestor() const* {
1997	return const_cast<DeclContext>(this*)->getNonClosureAncestor();
1998	}
1999
2000	/// getPrimaryContext - There may be many different
2001	/// declarations of the same entity (including forward declarations
2002	/// of classes, multiple definitions of namespaces, etc.), each with
2003	/// a different set of declarations. This routine returns the
2004	/// "primary" DeclContext structure, which will contain the
2005	/// information needed to perform name lookup into this context.
2006	DeclContext *getPrimaryContext();
2007	const DeclContext getPrimaryContext() const* {
2008	return const_cast<DeclContext>(this*)->getPrimaryContext();
2009	}
2010
2011	/// getRedeclContext - Retrieve the context in which an entity conflicts with
2012	/// other entities of the same name, or where it is a redeclaration if the
2013	/// two entities are compatible. This skips through transparent contexts.
2014	DeclContext *getRedeclContext();
2015	const DeclContext getRedeclContext() const* {
2016	return const_cast<DeclContext >(this*)->getRedeclContext();
2017	}
2018
2019	/// Retrieve the nearest enclosing namespace context.
2020	DeclContext *getEnclosingNamespaceContext();
2021	const DeclContext getEnclosingNamespaceContext() const* {
2022	return const_cast<DeclContext >(this*)->getEnclosingNamespaceContext();
2023	}
2024
2025	/// Retrieve the outermost lexically enclosing record context.
2026	RecordDecl *getOuterLexicalRecordContext();
2027	const RecordDecl getOuterLexicalRecordContext() const* {
2028	return const_cast<DeclContext >(this*)->getOuterLexicalRecordContext();
2029	}
2030
2031	/// Test if this context is part of the enclosing namespace set of
2032	/// the context NS, as defined in C++0x [namespace.def]p9. If either context
2033	/// isn't a namespace, this is equivalent to Equals().
2034	///
2035	/// The enclosing namespace set of a namespace is the namespace and, if it is
2036	/// inline, its enclosing namespace, recursively.
2037	bool InEnclosingNamespaceSetOf(const DeclContext NS) const*;
2038
2039	/// Collects all of the declaration contexts that are semantically
2040	/// connected to this declaration context.
2041	///
2042	/// For declaration contexts that have multiple semantically connected but
2043	/// syntactically distinct contexts, such as C++ namespaces, this routine
2044	/// retrieves the complete set of such declaration contexts in source order.
2045	/// For example, given:
2046	///
2047	/// \code
2048	/// namespace N {
2049	/// int x;
2050	/// }
2051	/// namespace N {
2052	/// int y;
2053	/// }
2054	/// \endcode
2055	///
2056	/// The \c Contexts parameter will contain both definitions of N.
2057	///
2058	/// \param Contexts Will be cleared and set to the set of declaration
2059	/// contexts that are semanticaly connected to this declaration context,
2060	/// in source order, including this context (which may be the only result,
2061	/// for non-namespace contexts).
2062	void collectAllContexts(SmallVectorImpl<DeclContext *> &Contexts);
2063
2064	/// decl_iterator - Iterates through the declarations stored
2065	/// within this context.
2066	class decl_iterator {
2067	/// Current - The current declaration.
2068	Decl Current = nullptr*;
2069
2070	public:
2071	using value_type = Decl *;
2072	using reference = const value_type &;
2073	using pointer = const value_type *;
2074	using iterator_category = std::forward_iterator_tag;
2075	using difference_type = std::ptrdiff_t;
2076
2077	decl_iterator() = default;
2078	explicit decl_iterator(Decl *C) : Current(C) {}
2079
2080	reference operator() const* { return Current; }
2081
2082	// This doesn't meet the iterator requirements, but it's convenient
2083	value_type operator->() const { return Current; }
2084
2085	decl_iterator& operator++() {
2086	Current = Current->getNextDeclInContext();
2087	return *this;
2088	}
2089
2090	decl_iterator operator++(int) {
2091	decl_iterator tmp(*this);
2092	++(*this);
2093	return tmp;
2094	}
2095
2096	friend bool operator==(decl_iterator x, decl_iterator y) {
2097	return x.Current == y.Current;
2098	}
2099
2100	friend bool operator!=(decl_iterator x, decl_iterator y) {
2101	return x.Current != y.Current;
2102	}
2103	};
2104
2105	using decl_range = llvm::iterator_range<decl_iterator>;
2106
2107	/// decls_begin/decls_end - Iterate over the declarations stored in
2108	/// this context.
2109	decl_range decls() const { return decl_range (decls_begin(), decls_end()); }
2110	decl_iterator decls_begin() const;
2111	decl_iterator decls_end() const { return decl_iterator (); }
2112	bool decls_empty() const;
2113
2114	/// noload_decls_begin/end - Iterate over the declarations stored in this
2115	/// context that are currently loaded; don't attempt to retrieve anything
2116	/// from an external source.
2117	decl_range noload_decls() const {
2118	return decl_range (noload_decls_begin(), noload_decls_end());
2119	}
2120	decl_iterator noload_decls_begin() const { return decl_iterator (FirstDecl); }
2121	decl_iterator noload_decls_end() const { return decl_iterator (); }
2122
2123	/// specific_decl_iterator - Iterates over a subrange of
2124	/// declarations stored in a DeclContext, providing only those that
2125	/// are of type SpecificDecl (or a class derived from it). This
2126	/// iterator is used, for example, to provide iteration over just
2127	/// the fields within a RecordDecl (with SpecificDecl = FieldDecl).
2128	template<typename SpecificDecl>
2129	class specific_decl_iterator {
2130	/// Current - The current, underlying declaration iterator, which
2131	/// will either be NULL or will point to a declaration of
2132	/// type SpecificDecl.
2133	DeclContext::decl_iterator Current;
2134
2135	/// SkipToNextDecl - Advances the current position up to the next
2136	/// declaration of type SpecificDecl that also meets the criteria
2137	/// required by Acceptable.
2138	void SkipToNextDecl() {
2139	while (Current && !isa<SpecificDecl>(Current))
2140	++Current;
2141	}
2142
2143	public:
2144	using value_type = SpecificDecl *;
2145	// TODO: Add reference and pointer types (with some appropriate proxy type)
2146	// if we ever have a need for them.
2147	using reference = void;
2148	using pointer = void;
2149	using difference_type =
2150	std::iterator_traits<DeclContext::decl_iterator>::difference_type;
2151	using iterator_category = std::forward_iterator_tag;
2152
2153	specific_decl_iterator() = default;
2154
2155	/// specific_decl_iterator - Construct a new iterator over a
2156	/// subset of the declarations the range [C,
2157	/// end-of-declarations). If A is non-NULL, it is a pointer to a
2158	/// member function of SpecificDecl that should return true for
2159	/// all of the SpecificDecl instances that will be in the subset
2160	/// of iterators. For example, if you want Objective-C instance
2161	/// methods, SpecificDecl will be ObjCMethodDecl and A will be
2162	/// &ObjCMethodDecl::isInstanceMethod.
2163	explicit specific_decl_iterator(DeclContext::decl_iterator C) : Current (C) {
2164	SkipToNextDecl();
2165	}
2166
2167	value_type operator() const* { return cast<SpecificDecl>(*Current); }
2168
2169	// This doesn't meet the iterator requirements, but it's convenient
2170	value_type operator->() const { return **this; }
2171
2172	specific_decl_iterator& operator++() {
2173	++Current;
2174	SkipToNextDecl();
2175	return *this;
2176	}
2177
2178	specific_decl_iterator operator++(int) {
2179	specific_decl_iterator tmp(*this);
2180	++(*this);
2181	return tmp;
2182	}
2183
2184	friend bool operator==(const specific_decl_iterator& x,
2185	const specific_decl_iterator& y) {
2186	return x.Current == y.Current;
2187	}
2188
2189	friend bool operator!=(const specific_decl_iterator& x,
2190	const specific_decl_iterator& y) {
2191	return x.Current != y.Current;
2192	}
2193	};
2194
2195	/// Iterates over a filtered subrange of declarations stored
2196	/// in a DeclContext.
2197	///
2198	/// This iterator visits only those declarations that are of type
2199	/// SpecificDecl (or a class derived from it) and that meet some
2200	/// additional run-time criteria. This iterator is used, for
2201	/// example, to provide access to the instance methods within an
2202	/// Objective-C interface (with SpecificDecl = ObjCMethodDecl and
2203	/// Acceptable = ObjCMethodDecl::isInstanceMethod).
2204	template<typename SpecificDecl, bool (SpecificDecl::Acceptable)() const*>
2205	class filtered_decl_iterator {
2206	/// Current - The current, underlying declaration iterator, which
2207	/// will either be NULL or will point to a declaration of
2208	/// type SpecificDecl.
2209	DeclContext::decl_iterator Current;
2210
2211	/// SkipToNextDecl - Advances the current position up to the next
2212	/// declaration of type SpecificDecl that also meets the criteria
2213	/// required by Acceptable.
2214	void SkipToNextDecl() {
2215	while (*Current &&
2216	(!isa<SpecificDecl>(*Current) \|\|
2217	(Acceptable && !(cast<SpecificDecl>(Current)->Acceptable)())))
2218	++Current;
2219	}
2220
2221	public:
2222	using value_type = SpecificDecl *;
2223	// TODO: Add reference and pointer types (with some appropriate proxy type)
2224	// if we ever have a need for them.
2225	using reference = void;
2226	using pointer = void;
2227	using difference_type =
2228	std::iterator_traits<DeclContext::decl_iterator>::difference_type;
2229	using iterator_category = std::forward_iterator_tag;
2230
2231	filtered_decl_iterator() = default;
2232
2233	/// filtered_decl_iterator - Construct a new iterator over a
2234	/// subset of the declarations the range [C,
2235	/// end-of-declarations). If A is non-NULL, it is a pointer to a
2236	/// member function of SpecificDecl that should return true for
2237	/// all of the SpecificDecl instances that will be in the subset
2238	/// of iterators. For example, if you want Objective-C instance
2239	/// methods, SpecificDecl will be ObjCMethodDecl and A will be
2240	/// &ObjCMethodDecl::isInstanceMethod.
2241	explicit filtered_decl_iterator(DeclContext::decl_iterator C) : Current (C) {
2242	SkipToNextDecl();
2243	}
2244
2245	value_type operator() const* { return cast<SpecificDecl>(*Current); }
2246	value_type operator->() const { return cast<SpecificDecl>(*Current); }
2247
2248	filtered_decl_iterator& operator++() {
2249	++Current;
2250	SkipToNextDecl();
2251	return *this;
2252	}
2253
2254	filtered_decl_iterator operator++(int) {
2255	filtered_decl_iterator tmp(*this);
2256	++(*this);
2257	return tmp;
2258	}
2259
2260	friend bool operator==(const filtered_decl_iterator& x,
2261	const filtered_decl_iterator& y) {
2262	return x.Current == y.Current;
2263	}
2264
2265	friend bool operator!=(const filtered_decl_iterator& x,
2266	const filtered_decl_iterator& y) {
2267	return x.Current != y.Current;
2268	}
2269	};
2270
2271	/// Add the declaration D into this context.
2272	///
2273	/// This routine should be invoked when the declaration D has first
2274	/// been declared, to place D into the context where it was
2275	/// (lexically) defined. Every declaration must be added to one
2276	/// (and only one!) context, where it can be visited via
2277	/// [decls_begin(), decls_end()). Once a declaration has been added
2278	/// to its lexical context, the corresponding DeclContext owns the
2279	/// declaration.
2280	///
2281	/// If D is also a NamedDecl, it will be made visible within its
2282	/// semantic context via makeDeclVisibleInContext.
2283	void addDecl(Decl *D);
2284
2285	/// Add the declaration D into this context, but suppress
2286	/// searches for external declarations with the same name.
2287	///
2288	/// Although analogous in function to addDecl, this removes an
2289	/// important check. This is only useful if the Decl is being
2290	/// added in response to an external search; in all other cases,
2291	/// addDecl() is the right function to use.
2292	/// See the ASTImporter for use cases.
2293	void addDeclInternal(Decl *D);
2294
2295	/// Add the declaration D to this context without modifying
2296	/// any lookup tables.
2297	///
2298	/// This is useful for some operations in dependent contexts where
2299	/// the semantic context might not be dependent; this basically
2300	/// only happens with friends.
2301	void addHiddenDecl(Decl *D);
2302
2303	/// Removes a declaration from this context.
2304	void removeDecl(Decl *D);
2305
2306	/// Checks whether a declaration is in this context.
2307	bool containsDecl(Decl D) const*;
2308
2309	/// Checks whether a declaration is in this context.
2310	/// This also loads the Decls from the external source before the check.
2311	bool containsDeclAndLoad(Decl D) const*;
2312
2313	using lookup_result = DeclContextLookupResult;
2314	using lookup_iterator = lookup_result::iterator;
2315
2316	/// lookup - Find the declarations (if any) with the given Name in
2317	/// this context. Returns a range of iterators that contains all of
2318	/// the declarations with this name, with object, function, member,
2319	/// and enumerator names preceding any tag name. Note that this
2320	/// routine will not look into parent contexts.
2321	lookup_result lookup(DeclarationName Name) const;
2322
2323	/// Find the declarations with the given name that are visible
2324	/// within this context; don't attempt to retrieve anything from an
2325	/// external source.
2326	lookup_result noload_lookup(DeclarationName Name);
2327
2328	/// A simplistic name lookup mechanism that performs name lookup
2329	/// into this declaration context without consulting the external source.
2330	///
2331	/// This function should almost never be used, because it subverts the
2332	/// usual relationship between a DeclContext and the external source.
2333	/// See the ASTImporter for the (few, but important) use cases.
2334	///
2335	/// FIXME: This is very inefficient; replace uses of it with uses of
2336	/// noload_lookup.
2337	void localUncachedLookup(DeclarationName Name,
2338	SmallVectorImpl<NamedDecl *> &Results);
2339
2340	/// Makes a declaration visible within this context.
2341	///
2342	/// This routine makes the declaration D visible to name lookup
2343	/// within this context and, if this is a transparent context,
2344	/// within its parent contexts up to the first enclosing
2345	/// non-transparent context. Making a declaration visible within a
2346	/// context does not transfer ownership of a declaration, and a
2347	/// declaration can be visible in many contexts that aren't its
2348	/// lexical context.
2349	///
2350	/// If D is a redeclaration of an existing declaration that is
2351	/// visible from this context, as determined by
2352	/// NamedDecl::declarationReplaces, the previous declaration will be
2353	/// replaced with D.
2354	void makeDeclVisibleInContext(NamedDecl *D);
2355
2356	/// all_lookups_iterator - An iterator that provides a view over the results
2357	/// of looking up every possible name.
2358	class all_lookups_iterator;
2359
2360	using lookups_range = llvm::iterator_range<all_lookups_iterator>;
2361
2362	lookups_range lookups() const;
2363	// Like lookups(), but avoids loading external declarations.
2364	// If PreserveInternalState, avoids building lookup data structures too.
2365	lookups_range noload_lookups(bool PreserveInternalState) const;
2366
2367	/// Iterators over all possible lookups within this context.
2368	all_lookups_iterator lookups_begin() const;
2369	all_lookups_iterator lookups_end() const;
2370
2371	/// Iterators over all possible lookups within this context that are
2372	/// currently loaded; don't attempt to retrieve anything from an external
2373	/// source.
2374	all_lookups_iterator noload_lookups_begin() const;
2375	all_lookups_iterator noload_lookups_end() const;
2376
2377	struct udir_iterator;
2378
2379	using udir_iterator_base =
2380	llvm::iterator_adaptor_base<udir_iterator, lookup_iterator,
2381	typename lookup_iterator::iterator_category,
2382	UsingDirectiveDecl *>;
2383
2384	struct udir_iterator : udir_iterator_base {
2385	udir_iterator(lookup_iterator I) : udir_iterator_base (I) {}
2386
2387	UsingDirectiveDecl *operator() const*;
2388	};
2389
2390	using udir_range = llvm::iterator_range<udir_iterator>;
2391
2392	udir_range using_directives() const;
2393
2394	// These are all defined in DependentDiagnostic.h.
2395	class ddiag_iterator;
2396
2397	using ddiag_range = llvm::iterator_range<DeclContext::ddiag_iterator>;
2398
2399	inline ddiag_range ddiags() const;
2400
2401	// Low-level accessors
2402
2403	/// Mark that there are external lexical declarations that we need
2404	/// to include in our lookup table (and that are not available as external
2405	/// visible lookups). These extra lookup results will be found by walking
2406	/// the lexical declarations of this context. This should be used only if
2407	/// setHasExternalLexicalStorage() has been called on any decl context for
2408	/// which this is the primary context.
2409	void setMustBuildLookupTable() {
2410	assert(this == getPrimaryContext() &&
2411	"should only be called on primary context");
2412	DeclContextBits.HasLazyExternalLexicalLookups = true;
2413	}
2414
2415	/// Retrieve the internal representation of the lookup structure.
2416	/// This may omit some names if we are lazily building the structure.
2417	StoredDeclsMap getLookupPtr() const* { return LookupPtr; }
2418
2419	/// Ensure the lookup structure is fully-built and return it.
2420	StoredDeclsMap *buildLookup();
2421
2422	/// Whether this DeclContext has external storage containing
2423	/// additional declarations that are lexically in this context.
2424	bool hasExternalLexicalStorage() const {
2425	return DeclContextBits.ExternalLexicalStorage;
2426	}
2427
2428	/// State whether this DeclContext has external storage for
2429	/// declarations lexically in this context.
2430	void setHasExternalLexicalStorage(bool ES = true) const {
2431	DeclContextBits.ExternalLexicalStorage = ES;
2432	}
2433
2434	/// Whether this DeclContext has external storage containing
2435	/// additional declarations that are visible in this context.
2436	bool hasExternalVisibleStorage() const {
2437	return DeclContextBits.ExternalVisibleStorage;
2438	}
2439
2440	/// State whether this DeclContext has external storage for
2441	/// declarations visible in this context.
2442	void setHasExternalVisibleStorage(bool ES = true) const {
2443	DeclContextBits.ExternalVisibleStorage = ES;
2444	if (ES && LookupPtr)
2445	DeclContextBits.NeedToReconcileExternalVisibleStorage = true;
2446	}
2447
2448	/// Determine whether the given declaration is stored in the list of
2449	/// declarations lexically within this context.
2450	bool isDeclInLexicalTraversal(const Decl D) const* {
2451	return D && (D->NextInContextAndBits.getPointer() \|\| D == FirstDecl \|\|
2452	D == LastDecl);
2453	}
2454
2455	bool setUseQualifiedLookup(bool use = true) const {
2456	bool old_value = DeclContextBits.UseQualifiedLookup;
2457	DeclContextBits.UseQualifiedLookup = use;
2458	return old_value;
2459	}
2460
2461	bool shouldUseQualifiedLookup() const {
2462	return DeclContextBits.UseQualifiedLookup;
2463	}
2464
2465	static bool classof(const Decl *D);
2466	static bool classof(const DeclContext D) { return* true; }
2467
2468	void dumpDeclContext() const;
2469	void dumpLookups() const;
2470	void dumpLookups(llvm::raw_ostream &OS, bool DumpDecls = false,
2471	bool Deserialize = false) const;
2472
2473	private:
2474	/// Whether this declaration context has had externally visible
2475	/// storage added since the last lookup. In this case, \c LookupPtr's
2476	/// invariant may not hold and needs to be fixed before we perform
2477	/// another lookup.
2478	bool hasNeedToReconcileExternalVisibleStorage() const {
2479	return DeclContextBits.NeedToReconcileExternalVisibleStorage;
2480	}
2481
2482	/// State that this declaration context has had externally visible
2483	/// storage added since the last lookup. In this case, \c LookupPtr's
2484	/// invariant may not hold and needs to be fixed before we perform
2485	/// another lookup.
2486	void setNeedToReconcileExternalVisibleStorage(bool Need = true) const {
2487	DeclContextBits.NeedToReconcileExternalVisibleStorage = Need;
2488	}
2489
2490	/// If \c true, this context may have local lexical declarations
2491	/// that are missing from the lookup table.
2492	bool hasLazyLocalLexicalLookups() const {
2493	return DeclContextBits.HasLazyLocalLexicalLookups;
2494	}
2495
2496	/// If \c true, this context may have local lexical declarations
2497	/// that are missing from the lookup table.
2498	void setHasLazyLocalLexicalLookups(bool HasLLLL = true) const {
2499	DeclContextBits.HasLazyLocalLexicalLookups = HasLLLL;
2500	}
2501
2502	/// If \c true, the external source may have lexical declarations
2503	/// that are missing from the lookup table.
2504	bool hasLazyExternalLexicalLookups() const {
2505	return DeclContextBits.HasLazyExternalLexicalLookups;
2506	}
2507
2508	/// If \c true, the external source may have lexical declarations
2509	/// that are missing from the lookup table.
2510	void setHasLazyExternalLexicalLookups(bool HasLELL = true) const {
2511	DeclContextBits.HasLazyExternalLexicalLookups = HasLELL;
2512	}
2513
2514	void reconcileExternalVisibleStorage() const;
2515	bool LoadLexicalDeclsFromExternalStorage() const;
2516
2517	/// Makes a declaration visible within this context, but
2518	/// suppresses searches for external declarations with the same
2519	/// name.
2520	///
2521	/// Analogous to makeDeclVisibleInContext, but for the exclusive
2522	/// use of addDeclInternal().
2523	void makeDeclVisibleInContextInternal(NamedDecl *D);
2524
2525	StoredDeclsMap CreateStoredDeclsMap(ASTContext &C) const*;
2526
2527	void loadLazyLocalLexicalLookups();
2528	void buildLookupImpl(DeclContext DCtx, bool* Internal);
2529	void makeDeclVisibleInContextWithFlags(NamedDecl D, bool* Internal,
2530	bool Rediscoverable);
2531	void makeDeclVisibleInContextImpl(NamedDecl D, bool* Internal);
2532	};
2533
2534	inline bool Decl::isTemplateParameter() const {
2535	return getKind() == TemplateTypeParm \|\| getKind() == NonTypeTemplateParm \|\|
2536	getKind() == TemplateTemplateParm;
2537	}
2538
2539	// Specialization selected when ToTy is not a known subclass of DeclContext.
2540	template <class ToTy,
2541	bool IsKnownSubtype = ::std::is_base_of<DeclContext, ToTy>::value>
2542	struct cast_convert_decl_context {
2543	static const ToTy doit(const* DeclContext *Val) {
2544	return static_cast<const ToTy*>(Decl::castFromDeclContext(Val));
2545	}
2546
2547	static ToTy doit(DeclContext Val) {
2548	return static_cast<ToTy*>(Decl::castFromDeclContext(Val));
2549	}
2550	};
2551
2552	// Specialization selected when ToTy is a known subclass of DeclContext.
2553	template <class ToTy>
2554	struct cast_convert_decl_context<ToTy, true> {
2555	static const ToTy doit(const* DeclContext *Val) {
2556	return static_cast<const ToTy*>(Val);
2557	}
2558
2559	static ToTy doit(DeclContext Val) {
2560	return static_cast<ToTy*>(Val);
2561	}
2562	};
2563
2564	} // namespace clang
2565
2566	namespace llvm {
2567
2568	/// isa<T>(DeclContext)*
2569	template <typename To>
2570	struct isa_impl<To, ::clang::DeclContext> {
2571	static bool doit(const ::clang::DeclContext &Val) {
2572	return To::classofKind(Val.getDeclKind());
2573	}
2574	};
2575
2576	/// cast<T>(DeclContext)*
2577	template<class ToTy>
2578	struct cast_convert_val<ToTy,
2579	const ::clang::DeclContext,const ::clang::DeclContext> {
2580	static const ToTy &doit(const ::clang::DeclContext &Val) {
2581	return *::clang::cast_convert_decl_context<ToTy>::doit(&Val);
2582	}
2583	};
2584
2585	template<class ToTy>
2586	struct cast_convert_val<ToTy, ::clang::DeclContext, ::clang::DeclContext> {
2587	static ToTy &doit(::clang::DeclContext &Val) {
2588	return *::clang::cast_convert_decl_context<ToTy>::doit(&Val);
2589	}
2590	};
2591
2592	template<class ToTy>
2593	struct cast_convert_val<ToTy,
2594	const ::clang::DeclContext, const* ::clang::DeclContext*> {
2595	static const ToTy doit(const* ::clang::DeclContext *Val) {
2596	return ::clang::cast_convert_decl_context<ToTy>::doit(Val);
2597	}
2598	};
2599
2600	template<class ToTy>
2601	struct cast_convert_val<ToTy, ::clang::DeclContext, ::clang::DeclContext> {
2602	static ToTy doit(::clang::DeclContext Val) {
2603	return ::clang::cast_convert_decl_context<ToTy>::doit(Val);
2604	}
2605	};
2606
2607	/// Implement cast_convert_val for Decl -> DeclContext conversions.
2608	template<class FromTy>
2609	struct cast_convert_val< ::clang::DeclContext, FromTy, FromTy> {
2610	static ::clang::DeclContext &doit(const FromTy &Val) {
2611	return *FromTy::castToDeclContext(&Val);
2612	}
2613	};
2614
2615	template<class FromTy>
2616	struct cast_convert_val< ::clang::DeclContext, FromTy, FromTy> {
2617	static ::clang::DeclContext doit(const* FromTy *Val) {
2618	return FromTy::castToDeclContext(Val);
2619	}
2620	};
2621
2622	template<class FromTy>
2623	struct cast_convert_val< const ::clang::DeclContext, FromTy, FromTy> {
2624	static const ::clang::DeclContext &doit(const FromTy &Val) {
2625	return *FromTy::castToDeclContext(&Val);
2626	}
2627	};
2628
2629	template<class FromTy>
2630	struct cast_convert_val< const ::clang::DeclContext, FromTy, FromTy> {
2631	static const ::clang::DeclContext doit(const* FromTy *Val) {
2632	return FromTy::castToDeclContext(Val);
2633	}
2634	};
2635
2636	} // namespace llvm
2637
2638	#endif // LLVM_CLANG_AST_DECLBASE_H
2639

Browse the source code of clang/include/clang/AST/DeclBase.h