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