1	//===- ASTWriter.cpp - AST File Writer ------------------------------------===//
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 ASTWriter class, which writes AST files.
10	//
11	//===----------------------------------------------------------------------===//
12
13	#include "ASTCommon.h"
14	#include "ASTReaderInternals.h"
15	#include "MultiOnDiskHashTable.h"
16	#include "TemplateArgumentHasher.h"
17	#include "clang/AST/ASTContext.h"
18	#include "clang/AST/ASTUnresolvedSet.h"
19	#include "clang/AST/AbstractTypeWriter.h"
20	#include "clang/AST/Attr.h"
21	#include "clang/AST/Decl.h"
22	#include "clang/AST/DeclBase.h"
23	#include "clang/AST/DeclCXX.h"
24	#include "clang/AST/DeclContextInternals.h"
25	#include "clang/AST/DeclFriend.h"
26	#include "clang/AST/DeclObjC.h"
27	#include "clang/AST/DeclTemplate.h"
28	#include "clang/AST/DeclarationName.h"
29	#include "clang/AST/Expr.h"
30	#include "clang/AST/ExprCXX.h"
31	#include "clang/AST/LambdaCapture.h"
32	#include "clang/AST/NestedNameSpecifier.h"
33	#include "clang/AST/OpenACCClause.h"
34	#include "clang/AST/OpenMPClause.h"
35	#include "clang/AST/RawCommentList.h"
36	#include "clang/AST/TemplateName.h"
37	#include "clang/AST/Type.h"
38	#include "clang/AST/TypeLoc.h"
39	#include "clang/AST/TypeLocVisitor.h"
40	#include "clang/Basic/Diagnostic.h"
41	#include "clang/Basic/DiagnosticOptions.h"
42	#include "clang/Basic/FileEntry.h"
43	#include "clang/Basic/FileManager.h"
44	#include "clang/Basic/FileSystemOptions.h"
45	#include "clang/Basic/IdentifierTable.h"
46	#include "clang/Basic/LLVM.h"
47	#include "clang/Basic/Lambda.h"
48	#include "clang/Basic/LangOptions.h"
49	#include "clang/Basic/Module.h"
50	#include "clang/Basic/ObjCRuntime.h"
51	#include "clang/Basic/OpenACCKinds.h"
52	#include "clang/Basic/OpenCLOptions.h"
53	#include "clang/Basic/SourceLocation.h"
54	#include "clang/Basic/SourceManager.h"
55	#include "clang/Basic/SourceManagerInternals.h"
56	#include "clang/Basic/Specifiers.h"
57	#include "clang/Basic/TargetInfo.h"
58	#include "clang/Basic/TargetOptions.h"
59	#include "clang/Basic/Version.h"
60	#include "clang/Lex/HeaderSearch.h"
61	#include "clang/Lex/HeaderSearchOptions.h"
62	#include "clang/Lex/MacroInfo.h"
63	#include "clang/Lex/ModuleMap.h"
64	#include "clang/Lex/PreprocessingRecord.h"
65	#include "clang/Lex/Preprocessor.h"
66	#include "clang/Lex/PreprocessorOptions.h"
67	#include "clang/Lex/Token.h"
68	#include "clang/Sema/IdentifierResolver.h"
69	#include "clang/Sema/ObjCMethodList.h"
70	#include "clang/Sema/Sema.h"
71	#include "clang/Sema/SemaCUDA.h"
72	#include "clang/Sema/SemaObjC.h"
73	#include "clang/Sema/Weak.h"
74	#include "clang/Serialization/ASTBitCodes.h"
75	#include "clang/Serialization/ASTReader.h"
76	#include "clang/Serialization/ASTRecordWriter.h"
77	#include "clang/Serialization/InMemoryModuleCache.h"
78	#include "clang/Serialization/ModuleCache.h"
79	#include "clang/Serialization/ModuleFile.h"
80	#include "clang/Serialization/ModuleFileExtension.h"
81	#include "clang/Serialization/SerializationDiagnostic.h"
82	#include "llvm/ADT/APFloat.h"
83	#include "llvm/ADT/APInt.h"
84	#include "llvm/ADT/ArrayRef.h"
85	#include "llvm/ADT/DenseMap.h"
86	#include "llvm/ADT/DenseSet.h"
87	#include "llvm/ADT/PointerIntPair.h"
88	#include "llvm/ADT/STLExtras.h"
89	#include "llvm/ADT/ScopeExit.h"
90	#include "llvm/ADT/SmallPtrSet.h"
91	#include "llvm/ADT/SmallString.h"
92	#include "llvm/ADT/SmallVector.h"
93	#include "llvm/ADT/StringRef.h"
94	#include "llvm/Bitstream/BitCodes.h"
95	#include "llvm/Bitstream/BitstreamWriter.h"
96	#include "llvm/Support/Compression.h"
97	#include "llvm/Support/DJB.h"
98	#include "llvm/Support/EndianStream.h"
99	#include "llvm/Support/ErrorHandling.h"
100	#include "llvm/Support/LEB128.h"
101	#include "llvm/Support/MemoryBuffer.h"
102	#include "llvm/Support/OnDiskHashTable.h"
103	#include "llvm/Support/Path.h"
104	#include "llvm/Support/SHA1.h"
105	#include "llvm/Support/TimeProfiler.h"
106	#include "llvm/Support/VersionTuple.h"
107	#include "llvm/Support/raw_ostream.h"
108	#include <algorithm>
109	#include <cassert>
110	#include <cstdint>
111	#include <cstdlib>
112	#include <cstring>
113	#include <ctime>
114	#include <limits>
115	#include <memory>
116	#include <optional>
117	#include <queue>
118	#include <tuple>
119	#include <utility>
120	#include <vector>
121
122	using namespace clang;
123	using namespace clang::serialization;
124
125	template <typename T, typename Allocator>
126	static StringRef bytes(const std::vector<T, Allocator> &v) {
127	if (v.empty()) return StringRef();
128	return StringRef(reinterpret_cast<const char*>(&v[0]),
129	sizeof(T) * v.size());
130	}
131
132	template <typename T>
133	static StringRef bytes(const SmallVectorImpl<T> &v) {
134	return StringRef(reinterpret_cast<const char*>(v.data()),
135	sizeof(T) * v.size());
136	}
137
138	static std::string bytes(const std::vector<bool> &V) {
139	std::string Str;
140	Str.reserve(res: V.size() / 8);
141	for (unsigned I = 0, E = V.size(); I < E;) {
142	char Byte = 0;
143	for (unsigned Bit = 0; Bit < 8 && I < E; ++Bit, ++I)
144	Byte |= V[I] << Bit;
145	Str += Byte;
146	}
147	return Str;
148	}
149
150	//===----------------------------------------------------------------------===//
151	// Type serialization
152	//===----------------------------------------------------------------------===//
153
154	static TypeCode getTypeCodeForTypeClass(Type::TypeClass id) {
155	switch (id) {
156	#define TYPE_BIT_CODE(CLASS_ID, CODE_ID, CODE_VALUE) \
157	case Type::CLASS_ID: return TYPE_##CODE_ID;
158	#include "clang/Serialization/TypeBitCodes.def"
159	case Type::Builtin:
160	llvm_unreachable("shouldn't be serializing a builtin type this way");
161	}
162	llvm_unreachable("bad type kind");
163	}
164
165	namespace {
166
167	struct AffectingModuleMaps {
168	llvm::DenseSet<FileID> DefinitionFileIDs;
169	llvm::DenseSet<const FileEntry *> DefinitionFiles;
170	};
171
172	std::optional<AffectingModuleMaps>
173	GetAffectingModuleMaps(const Preprocessor &PP, Module *RootModule) {
174	if (!PP.getHeaderSearchInfo()
175	.getHeaderSearchOpts()
176	.ModulesPruneNonAffectingModuleMaps)
177	return std::nullopt;
178
179	const HeaderSearch &HS = PP.getHeaderSearchInfo();
180	const SourceManager &SM = PP.getSourceManager();
181	const ModuleMap &MM = HS.getModuleMap();
182
183	// Module maps used only by textual headers are special. Their FileID is
184	// non-affecting, but their FileEntry is (i.e. must be written as InputFile).
185	enum AffectedReason : bool {
186	AR_TextualHeader = 0,
187	AR_ImportOrTextualHeader = 1,
188	};
189	auto AssignMostImportant = [](AffectedReason &LHS, AffectedReason RHS) {
190	LHS = std::max(a: LHS, b: RHS);
191	};
192	llvm::DenseMap<FileID, AffectedReason> ModuleMaps;
193	llvm::DenseMap<const Module *, AffectedReason> ProcessedModules;
194	auto CollectModuleMapsForHierarchy = [&](const Module *M,
195	AffectedReason Reason) {
196	M = M->getTopLevelModule();
197
198	// We need to process the header either when it was not present or when we
199	// previously flagged module map as textual headers and now we found a
200	// proper import.
201	if (auto [It, Inserted] = ProcessedModules.insert(KV: {M, Reason});
202	!Inserted && Reason <= It->second) {
203	return;
204	} else {
205	It->second = Reason;
206	}
207
208	std::queue<const Module *> Q;
209	Q.push(x: M);
210	while (!Q.empty()) {
211	const Module *Mod = Q.front();
212	Q.pop();
213
214	// The containing module map is affecting, because it's being pointed
215	// into by Module::DefinitionLoc.
216	if (auto F = MM.getContainingModuleMapFileID(Module: Mod); F.isValid())
217	AssignMostImportant(ModuleMaps[F], Reason);
218	// For inferred modules, the module map that allowed inferring is not
219	// related to the virtual containing module map file. It did affect the
220	// compilation, though.
221	if (auto UniqF = MM.getModuleMapFileIDForUniquing(M: Mod); UniqF.isValid())
222	AssignMostImportant(ModuleMaps[UniqF], Reason);
223
224	for (auto *SubM : Mod->submodules())
225	Q.push(x: SubM);
226	}
227	};
228
229	// Handle all the affecting modules referenced from the root module.
230
231	CollectModuleMapsForHierarchy(RootModule, AR_ImportOrTextualHeader);
232
233	std::queue<const Module *> Q;
234	Q.push(x: RootModule);
235	while (!Q.empty()) {
236	const Module *CurrentModule = Q.front();
237	Q.pop();
238
239	for (const Module *ImportedModule : CurrentModule->Imports)
240	CollectModuleMapsForHierarchy(ImportedModule, AR_ImportOrTextualHeader);
241	for (const Module *UndeclaredModule : CurrentModule->UndeclaredUses)
242	CollectModuleMapsForHierarchy(UndeclaredModule, AR_ImportOrTextualHeader);
243
244	for (auto *M : CurrentModule->submodules())
245	Q.push(x: M);
246	}
247
248	// Handle textually-included headers that belong to other modules.
249
250	SmallVector<OptionalFileEntryRef, 16> FilesByUID;
251	HS.getFileMgr().GetUniqueIDMapping(UIDToFiles&: FilesByUID);
252
253	if (FilesByUID.size() > HS.header_file_size())
254	FilesByUID.resize(N: HS.header_file_size());
255
256	for (unsigned UID = 0, LastUID = FilesByUID.size(); UID != LastUID; ++UID) {
257	OptionalFileEntryRef File = FilesByUID[UID];
258	if (!File)
259	continue;
260
261	const HeaderFileInfo *HFI = HS.getExistingLocalFileInfo(FE: *File);
262	if (!HFI)
263	continue; // We have no information on this being a header file.
264	if (!HFI->isCompilingModuleHeader && HFI->isModuleHeader)
265	continue; // Modular header, handled in the above module-based loop.
266	if (!HFI->isCompilingModuleHeader && !HFI->IsLocallyIncluded)
267	continue; // Non-modular header not included locally is not affecting.
268
269	for (const auto &KH : HS.findResolvedModulesForHeader(File: *File))
270	if (const Module *M = KH.getModule())
271	CollectModuleMapsForHierarchy(M, AR_TextualHeader);
272	}
273
274	// FIXME: This algorithm is not correct for module map hierarchies where
275	// module map file defining a (sub)module of a top-level module X includes
276	// a module map file that defines a (sub)module of another top-level module Y.
277	// Whenever X is affecting and Y is not, "replaying" this PCM file will fail
278	// when parsing module map files for X due to not knowing about the `extern`
279	// module map for Y.
280	//
281	// We don't have a good way to fix it here. We could mark all children of
282	// affecting module map files as being affecting as well, but that's
283	// expensive. SourceManager does not model the edge from parent to child
284	// SLocEntries, so instead, we would need to iterate over leaf module map
285	// files, walk up their include hierarchy and check whether we arrive at an
286	// affecting module map.
287	//
288	// Instead of complicating and slowing down this function, we should probably
289	// just ban module map hierarchies where module map defining a (sub)module X
290	// includes a module map defining a module that's not a submodule of X.
291
292	llvm::DenseSet<const FileEntry *> ModuleFileEntries;
293	llvm::DenseSet<FileID> ModuleFileIDs;
294	for (auto [FID, Reason] : ModuleMaps) {
295	if (Reason == AR_ImportOrTextualHeader)
296	ModuleFileIDs.insert(V: FID);
297	if (auto *FE = SM.getFileEntryForID(FID))
298	ModuleFileEntries.insert(V: FE);
299	}
300
301	AffectingModuleMaps R;
302	R.DefinitionFileIDs = std::move(ModuleFileIDs);
303	R.DefinitionFiles = std::move(ModuleFileEntries);
304	return std::move(R);
305	}
306
307	class ASTTypeWriter {
308	ASTWriter &Writer;
309	ASTWriter::RecordData Record;
310	ASTRecordWriter BasicWriter;
311
312	public:
313	ASTTypeWriter(ASTContext &Context, ASTWriter &Writer)
314	: Writer(Writer), BasicWriter(Context, Writer, Record) {}
315
316	uint64_t write(QualType T) {
317	if (T.hasLocalNonFastQualifiers()) {
318	Qualifiers Qs = T.getLocalQualifiers();
319	BasicWriter.writeQualType(T.getLocalUnqualifiedType());
320	BasicWriter.writeQualifiers(Qs);
321	return BasicWriter.Emit(TYPE_EXT_QUAL, Writer.getTypeExtQualAbbrev());
322	}
323
324	const Type *typePtr = T.getTypePtr();
325	serialization::AbstractTypeWriter<ASTRecordWriter> atw(BasicWriter);
326	atw.write(typePtr);
327	return BasicWriter.Emit(getTypeCodeForTypeClass(typePtr->getTypeClass()),
328	/*abbrev*/ 0);
329	}
330	};
331
332	class TypeLocWriter : public TypeLocVisitor<TypeLocWriter> {
333	using LocSeq = SourceLocationSequence;
334
335	ASTRecordWriter &Record;
336	LocSeq *Seq;
337
338	void addSourceLocation(SourceLocation Loc) {
339	Record.AddSourceLocation(Loc, Seq);
340	}
341	void addSourceRange(SourceRange Range) { Record.AddSourceRange(Range, Seq); }
342
343	public:
344	TypeLocWriter(ASTRecordWriter &Record, LocSeq *Seq)
345	: Record(Record), Seq(Seq) {}
346
347	#define ABSTRACT_TYPELOC(CLASS, PARENT)
348	#define TYPELOC(CLASS, PARENT) \
349	void Visit##CLASS##TypeLoc(CLASS##TypeLoc TyLoc);
350	#include "clang/AST/TypeLocNodes.def"
351
352	void VisitArrayTypeLoc(ArrayTypeLoc TyLoc);
353	void VisitFunctionTypeLoc(FunctionTypeLoc TyLoc);
354	};
355
356	} // namespace
357
358	void TypeLocWriter::VisitQualifiedTypeLoc(QualifiedTypeLoc TL) {
359	// nothing to do
360	}
361
362	void TypeLocWriter::VisitBuiltinTypeLoc(BuiltinTypeLoc TL) {
363	addSourceLocation(Loc: TL.getBuiltinLoc());
364	if (TL.needsExtraLocalData()) {
365	Record.push_back(N: TL.getWrittenTypeSpec());
366	Record.push_back(N: static_cast<uint64_t>(TL.getWrittenSignSpec()));
367	Record.push_back(N: static_cast<uint64_t>(TL.getWrittenWidthSpec()));
368	Record.push_back(N: TL.hasModeAttr());
369	}
370	}
371
372	void TypeLocWriter::VisitComplexTypeLoc(ComplexTypeLoc TL) {
373	addSourceLocation(Loc: TL.getNameLoc());
374	}
375
376	void TypeLocWriter::VisitPointerTypeLoc(PointerTypeLoc TL) {
377	addSourceLocation(Loc: TL.getStarLoc());
378	}
379
380	void TypeLocWriter::VisitDecayedTypeLoc(DecayedTypeLoc TL) {
381	// nothing to do
382	}
383
384	void TypeLocWriter::VisitAdjustedTypeLoc(AdjustedTypeLoc TL) {
385	// nothing to do
386	}
387
388	void TypeLocWriter::VisitArrayParameterTypeLoc(ArrayParameterTypeLoc TL) {
389	// nothing to do
390	}
391
392	void TypeLocWriter::VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL) {
393	addSourceLocation(Loc: TL.getCaretLoc());
394	}
395
396	void TypeLocWriter::VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL) {
397	addSourceLocation(Loc: TL.getAmpLoc());
398	}
399
400	void TypeLocWriter::VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL) {
401	addSourceLocation(Loc: TL.getAmpAmpLoc());
402	}
403
404	void TypeLocWriter::VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL) {
405	addSourceLocation(Loc: TL.getStarLoc());
406	Record.AddNestedNameSpecifierLoc(NNS: TL.getQualifierLoc());
407	}
408
409	void TypeLocWriter::VisitArrayTypeLoc(ArrayTypeLoc TL) {
410	addSourceLocation(Loc: TL.getLBracketLoc());
411	addSourceLocation(Loc: TL.getRBracketLoc());
412	Record.push_back(N: TL.getSizeExpr() ? 1 : 0);
413	if (TL.getSizeExpr())
414	Record.AddStmt(TL.getSizeExpr());
415	}
416
417	void TypeLocWriter::VisitConstantArrayTypeLoc(ConstantArrayTypeLoc TL) {
418	VisitArrayTypeLoc(TL);
419	}
420
421	void TypeLocWriter::VisitIncompleteArrayTypeLoc(IncompleteArrayTypeLoc TL) {
422	VisitArrayTypeLoc(TL);
423	}
424
425	void TypeLocWriter::VisitVariableArrayTypeLoc(VariableArrayTypeLoc TL) {
426	VisitArrayTypeLoc(TL);
427	}
428
429	void TypeLocWriter::VisitDependentSizedArrayTypeLoc(
430	DependentSizedArrayTypeLoc TL) {
431	VisitArrayTypeLoc(TL);
432	}
433
434	void TypeLocWriter::VisitDependentAddressSpaceTypeLoc(
435	DependentAddressSpaceTypeLoc TL) {
436	addSourceLocation(Loc: TL.getAttrNameLoc());
437	SourceRange range = TL.getAttrOperandParensRange();
438	addSourceLocation(Loc: range.getBegin());
439	addSourceLocation(Loc: range.getEnd());
440	Record.AddStmt(TL.getAttrExprOperand());
441	}
442
443	void TypeLocWriter::VisitDependentSizedExtVectorTypeLoc(
444	DependentSizedExtVectorTypeLoc TL) {
445	addSourceLocation(Loc: TL.getNameLoc());
446	}
447
448	void TypeLocWriter::VisitVectorTypeLoc(VectorTypeLoc TL) {
449	addSourceLocation(Loc: TL.getNameLoc());
450	}
451
452	void TypeLocWriter::VisitDependentVectorTypeLoc(
453	DependentVectorTypeLoc TL) {
454	addSourceLocation(Loc: TL.getNameLoc());
455	}
456
457	void TypeLocWriter::VisitExtVectorTypeLoc(ExtVectorTypeLoc TL) {
458	addSourceLocation(Loc: TL.getNameLoc());
459	}
460
461	void TypeLocWriter::VisitConstantMatrixTypeLoc(ConstantMatrixTypeLoc TL) {
462	addSourceLocation(Loc: TL.getAttrNameLoc());
463	SourceRange range = TL.getAttrOperandParensRange();
464	addSourceLocation(Loc: range.getBegin());
465	addSourceLocation(Loc: range.getEnd());
466	Record.AddStmt(S: TL.getAttrRowOperand());
467	Record.AddStmt(S: TL.getAttrColumnOperand());
468	}
469
470	void TypeLocWriter::VisitDependentSizedMatrixTypeLoc(
471	DependentSizedMatrixTypeLoc TL) {
472	addSourceLocation(Loc: TL.getAttrNameLoc());
473	SourceRange range = TL.getAttrOperandParensRange();
474	addSourceLocation(Loc: range.getBegin());
475	addSourceLocation(Loc: range.getEnd());
476	Record.AddStmt(S: TL.getAttrRowOperand());
477	Record.AddStmt(S: TL.getAttrColumnOperand());
478	}
479
480	void TypeLocWriter::VisitFunctionTypeLoc(FunctionTypeLoc TL) {
481	addSourceLocation(Loc: TL.getLocalRangeBegin());
482	addSourceLocation(Loc: TL.getLParenLoc());
483	addSourceLocation(Loc: TL.getRParenLoc());
484	addSourceRange(Range: TL.getExceptionSpecRange());
485	addSourceLocation(Loc: TL.getLocalRangeEnd());
486	for (unsigned i = 0, e = TL.getNumParams(); i != e; ++i)
487	Record.AddDeclRef(TL.getParam(i));
488	}
489
490	void TypeLocWriter::VisitFunctionProtoTypeLoc(FunctionProtoTypeLoc TL) {
491	VisitFunctionTypeLoc(TL);
492	}
493
494	void TypeLocWriter::VisitFunctionNoProtoTypeLoc(FunctionNoProtoTypeLoc TL) {
495	VisitFunctionTypeLoc(TL);
496	}
497
498	void TypeLocWriter::VisitUnresolvedUsingTypeLoc(UnresolvedUsingTypeLoc TL) {
499	addSourceLocation(Loc: TL.getNameLoc());
500	}
501
502	void TypeLocWriter::VisitUsingTypeLoc(UsingTypeLoc TL) {
503	addSourceLocation(Loc: TL.getNameLoc());
504	}
505
506	void TypeLocWriter::VisitTypedefTypeLoc(TypedefTypeLoc TL) {
507	addSourceLocation(Loc: TL.getNameLoc());
508	}
509
510	void TypeLocWriter::VisitObjCTypeParamTypeLoc(ObjCTypeParamTypeLoc TL) {
511	if (TL.getNumProtocols()) {
512	addSourceLocation(Loc: TL.getProtocolLAngleLoc());
513	addSourceLocation(Loc: TL.getProtocolRAngleLoc());
514	}
515	for (unsigned i = 0, e = TL.getNumProtocols(); i != e; ++i)
516	addSourceLocation(Loc: TL.getProtocolLoc(i));
517	}
518
519	void TypeLocWriter::VisitTypeOfExprTypeLoc(TypeOfExprTypeLoc TL) {
520	addSourceLocation(Loc: TL.getTypeofLoc());
521	addSourceLocation(Loc: TL.getLParenLoc());
522	addSourceLocation(Loc: TL.getRParenLoc());
523	}
524
525	void TypeLocWriter::VisitTypeOfTypeLoc(TypeOfTypeLoc TL) {
526	addSourceLocation(Loc: TL.getTypeofLoc());
527	addSourceLocation(Loc: TL.getLParenLoc());
528	addSourceLocation(Loc: TL.getRParenLoc());
529	Record.AddTypeSourceInfo(TInfo: TL.getUnmodifiedTInfo());
530	}
531
532	void TypeLocWriter::VisitDecltypeTypeLoc(DecltypeTypeLoc TL) {
533	addSourceLocation(Loc: TL.getDecltypeLoc());
534	addSourceLocation(Loc: TL.getRParenLoc());
535	}
536
537	void TypeLocWriter::VisitUnaryTransformTypeLoc(UnaryTransformTypeLoc TL) {
538	addSourceLocation(Loc: TL.getKWLoc());
539	addSourceLocation(Loc: TL.getLParenLoc());
540	addSourceLocation(Loc: TL.getRParenLoc());
541	Record.AddTypeSourceInfo(TInfo: TL.getUnderlyingTInfo());
542	}
543
544	void ASTRecordWriter::AddConceptReference(const ConceptReference *CR) {
545	assert(CR);
546	AddNestedNameSpecifierLoc(NNS: CR->getNestedNameSpecifierLoc());
547	AddSourceLocation(Loc: CR->getTemplateKWLoc());
548	AddDeclarationNameInfo(NameInfo: CR->getConceptNameInfo());
549	AddDeclRef(CR->getFoundDecl());
550	AddDeclRef(CR->getNamedConcept());
551	push_back(N: CR->getTemplateArgsAsWritten() != nullptr);
552	if (CR->getTemplateArgsAsWritten())
553	AddASTTemplateArgumentListInfo(ASTTemplArgList: CR->getTemplateArgsAsWritten());
554	}
555
556	void TypeLocWriter::VisitPackIndexingTypeLoc(PackIndexingTypeLoc TL) {
557	addSourceLocation(Loc: TL.getEllipsisLoc());
558	}
559
560	void TypeLocWriter::VisitAutoTypeLoc(AutoTypeLoc TL) {
561	addSourceLocation(Loc: TL.getNameLoc());
562	auto *CR = TL.getConceptReference();
563	Record.push_back(N: TL.isConstrained() && CR);
564	if (TL.isConstrained() && CR)
565	Record.AddConceptReference(CR);
566	Record.push_back(N: TL.isDecltypeAuto());
567	if (TL.isDecltypeAuto())
568	addSourceLocation(Loc: TL.getRParenLoc());
569	}
570
571	void TypeLocWriter::VisitDeducedTemplateSpecializationTypeLoc(
572	DeducedTemplateSpecializationTypeLoc TL) {
573	addSourceLocation(Loc: TL.getTemplateNameLoc());
574	}
575
576	void TypeLocWriter::VisitRecordTypeLoc(RecordTypeLoc TL) {
577	addSourceLocation(Loc: TL.getNameLoc());
578	}
579
580	void TypeLocWriter::VisitEnumTypeLoc(EnumTypeLoc TL) {
581	addSourceLocation(Loc: TL.getNameLoc());
582	}
583
584	void TypeLocWriter::VisitAttributedTypeLoc(AttributedTypeLoc TL) {
585	Record.AddAttr(A: TL.getAttr());
586	}
587
588	void TypeLocWriter::VisitCountAttributedTypeLoc(CountAttributedTypeLoc TL) {
589	// Nothing to do
590	}
591
592	void TypeLocWriter::VisitBTFTagAttributedTypeLoc(BTFTagAttributedTypeLoc TL) {
593	// Nothing to do.
594	}
595
596	void TypeLocWriter::VisitHLSLAttributedResourceTypeLoc(
597	HLSLAttributedResourceTypeLoc TL) {
598	// Nothing to do.
599	}
600
601	void TypeLocWriter::VisitHLSLInlineSpirvTypeLoc(HLSLInlineSpirvTypeLoc TL) {
602	// Nothing to do.
603	}
604
605	void TypeLocWriter::VisitTemplateTypeParmTypeLoc(TemplateTypeParmTypeLoc TL) {
606	addSourceLocation(Loc: TL.getNameLoc());
607	}
608
609	void TypeLocWriter::VisitSubstTemplateTypeParmTypeLoc(
610	SubstTemplateTypeParmTypeLoc TL) {
611	addSourceLocation(Loc: TL.getNameLoc());
612	}
613
614	void TypeLocWriter::VisitSubstTemplateTypeParmPackTypeLoc(
615	SubstTemplateTypeParmPackTypeLoc TL) {
616	addSourceLocation(Loc: TL.getNameLoc());
617	}
618
619	void TypeLocWriter::VisitTemplateSpecializationTypeLoc(
620	TemplateSpecializationTypeLoc TL) {
621	addSourceLocation(Loc: TL.getTemplateKeywordLoc());
622	addSourceLocation(Loc: TL.getTemplateNameLoc());
623	addSourceLocation(Loc: TL.getLAngleLoc());
624	addSourceLocation(Loc: TL.getRAngleLoc());
625	for (unsigned i = 0, e = TL.getNumArgs(); i != e; ++i)
626	Record.AddTemplateArgumentLocInfo(Kind: TL.getArgLoc(i).getArgument().getKind(),
627	Arg: TL.getArgLoc(i).getLocInfo());
628	}
629
630	void TypeLocWriter::VisitParenTypeLoc(ParenTypeLoc TL) {
631	addSourceLocation(Loc: TL.getLParenLoc());
632	addSourceLocation(Loc: TL.getRParenLoc());
633	}
634
635	void TypeLocWriter::VisitMacroQualifiedTypeLoc(MacroQualifiedTypeLoc TL) {
636	addSourceLocation(Loc: TL.getExpansionLoc());
637	}
638
639	void TypeLocWriter::VisitElaboratedTypeLoc(ElaboratedTypeLoc TL) {
640	addSourceLocation(Loc: TL.getElaboratedKeywordLoc());
641	Record.AddNestedNameSpecifierLoc(NNS: TL.getQualifierLoc());
642	}
643
644	void TypeLocWriter::VisitInjectedClassNameTypeLoc(InjectedClassNameTypeLoc TL) {
645	addSourceLocation(Loc: TL.getNameLoc());
646	}
647
648	void TypeLocWriter::VisitDependentNameTypeLoc(DependentNameTypeLoc TL) {
649	addSourceLocation(Loc: TL.getElaboratedKeywordLoc());
650	Record.AddNestedNameSpecifierLoc(NNS: TL.getQualifierLoc());
651	addSourceLocation(Loc: TL.getNameLoc());
652	}
653
654	void TypeLocWriter::VisitDependentTemplateSpecializationTypeLoc(
655	DependentTemplateSpecializationTypeLoc TL) {
656	addSourceLocation(Loc: TL.getElaboratedKeywordLoc());
657	Record.AddNestedNameSpecifierLoc(NNS: TL.getQualifierLoc());
658	addSourceLocation(Loc: TL.getTemplateKeywordLoc());
659	addSourceLocation(Loc: TL.getTemplateNameLoc());
660	addSourceLocation(Loc: TL.getLAngleLoc());
661	addSourceLocation(Loc: TL.getRAngleLoc());
662	for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I)
663	Record.AddTemplateArgumentLocInfo(Kind: TL.getArgLoc(i: I).getArgument().getKind(),
664	Arg: TL.getArgLoc(i: I).getLocInfo());
665	}
666
667	void TypeLocWriter::VisitPackExpansionTypeLoc(PackExpansionTypeLoc TL) {
668	addSourceLocation(Loc: TL.getEllipsisLoc());
669	}
670
671	void TypeLocWriter::VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL) {
672	addSourceLocation(Loc: TL.getNameLoc());
673	addSourceLocation(Loc: TL.getNameEndLoc());
674	}
675
676	void TypeLocWriter::VisitObjCObjectTypeLoc(ObjCObjectTypeLoc TL) {
677	Record.push_back(N: TL.hasBaseTypeAsWritten());
678	addSourceLocation(Loc: TL.getTypeArgsLAngleLoc());
679	addSourceLocation(Loc: TL.getTypeArgsRAngleLoc());
680	for (unsigned i = 0, e = TL.getNumTypeArgs(); i != e; ++i)
681	Record.AddTypeSourceInfo(TInfo: TL.getTypeArgTInfo(i));
682	addSourceLocation(Loc: TL.getProtocolLAngleLoc());
683	addSourceLocation(Loc: TL.getProtocolRAngleLoc());
684	for (unsigned i = 0, e = TL.getNumProtocols(); i != e; ++i)
685	addSourceLocation(Loc: TL.getProtocolLoc(i));
686	}
687
688	void TypeLocWriter::VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) {
689	addSourceLocation(Loc: TL.getStarLoc());
690	}
691
692	void TypeLocWriter::VisitAtomicTypeLoc(AtomicTypeLoc TL) {
693	addSourceLocation(Loc: TL.getKWLoc());
694	addSourceLocation(Loc: TL.getLParenLoc());
695	addSourceLocation(Loc: TL.getRParenLoc());
696	}
697
698	void TypeLocWriter::VisitPipeTypeLoc(PipeTypeLoc TL) {
699	addSourceLocation(Loc: TL.getKWLoc());
700	}
701
702	void TypeLocWriter::VisitBitIntTypeLoc(clang::BitIntTypeLoc TL) {
703	addSourceLocation(Loc: TL.getNameLoc());
704	}
705	void TypeLocWriter::VisitDependentBitIntTypeLoc(
706	clang::DependentBitIntTypeLoc TL) {
707	addSourceLocation(Loc: TL.getNameLoc());
708	}
709
710	void ASTWriter::WriteTypeAbbrevs() {
711	using namespace llvm;
712
713	std::shared_ptr<BitCodeAbbrev> Abv;
714
715	// Abbreviation for TYPE_EXT_QUAL
716	Abv = std::make_shared<BitCodeAbbrev>();
717	Abv->Add(OpInfo: BitCodeAbbrevOp(serialization::TYPE_EXT_QUAL));
718	Abv->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
719	Abv->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 3)); // Quals
720	TypeExtQualAbbrev = Stream.EmitAbbrev(Abbv: std::move(Abv));
721	}
722
723	//===----------------------------------------------------------------------===//
724	// ASTWriter Implementation
725	//===----------------------------------------------------------------------===//
726
727	static void EmitBlockID(unsigned ID, const char *Name,
728	llvm::BitstreamWriter &Stream,
729	ASTWriter::RecordDataImpl &Record) {
730	Record.clear();
731	Record.push_back(Elt: ID);
732	Stream.EmitRecord(Code: llvm::bitc::BLOCKINFO_CODE_SETBID, Vals: Record);
733
734	// Emit the block name if present.
735	if (!Name || Name[0] == 0)
736	return;
737	Record.clear();
738	while (*Name)
739	Record.push_back(Elt: *Name++);
740	Stream.EmitRecord(Code: llvm::bitc::BLOCKINFO_CODE_BLOCKNAME, Vals: Record);
741	}
742
743	static void EmitRecordID(unsigned ID, const char *Name,
744	llvm::BitstreamWriter &Stream,
745	ASTWriter::RecordDataImpl &Record) {
746	Record.clear();
747	Record.push_back(Elt: ID);
748	while (*Name)
749	Record.push_back(Elt: *Name++);
750	Stream.EmitRecord(Code: llvm::bitc::BLOCKINFO_CODE_SETRECORDNAME, Vals: Record);
751	}
752
753	static void AddStmtsExprs(llvm::BitstreamWriter &Stream,
754	ASTWriter::RecordDataImpl &Record) {
755	#define RECORD(X) EmitRecordID(X, #X, Stream, Record)
756	RECORD(STMT_STOP);
757	RECORD(STMT_NULL_PTR);
758	RECORD(STMT_REF_PTR);
759	RECORD(STMT_NULL);
760	RECORD(STMT_COMPOUND);
761	RECORD(STMT_CASE);
762	RECORD(STMT_DEFAULT);
763	RECORD(STMT_LABEL);
764	RECORD(STMT_ATTRIBUTED);
765	RECORD(STMT_IF);
766	RECORD(STMT_SWITCH);
767	RECORD(STMT_WHILE);
768	RECORD(STMT_DO);
769	RECORD(STMT_FOR);
770	RECORD(STMT_GOTO);
771	RECORD(STMT_INDIRECT_GOTO);
772	RECORD(STMT_CONTINUE);
773	RECORD(STMT_BREAK);
774	RECORD(STMT_RETURN);
775	RECORD(STMT_DECL);
776	RECORD(STMT_GCCASM);
777	RECORD(STMT_MSASM);
778	RECORD(EXPR_PREDEFINED);
779	RECORD(EXPR_DECL_REF);
780	RECORD(EXPR_INTEGER_LITERAL);
781	RECORD(EXPR_FIXEDPOINT_LITERAL);
782	RECORD(EXPR_FLOATING_LITERAL);
783	RECORD(EXPR_IMAGINARY_LITERAL);
784	RECORD(EXPR_STRING_LITERAL);
785	RECORD(EXPR_CHARACTER_LITERAL);
786	RECORD(EXPR_PAREN);
787	RECORD(EXPR_PAREN_LIST);
788	RECORD(EXPR_UNARY_OPERATOR);
789	RECORD(EXPR_SIZEOF_ALIGN_OF);
790	RECORD(EXPR_ARRAY_SUBSCRIPT);
791	RECORD(EXPR_CALL);
792	RECORD(EXPR_MEMBER);
793	RECORD(EXPR_BINARY_OPERATOR);
794	RECORD(EXPR_COMPOUND_ASSIGN_OPERATOR);
795	RECORD(EXPR_CONDITIONAL_OPERATOR);
796	RECORD(EXPR_IMPLICIT_CAST);
797	RECORD(EXPR_CSTYLE_CAST);
798	RECORD(EXPR_COMPOUND_LITERAL);
799	RECORD(EXPR_EXT_VECTOR_ELEMENT);
800	RECORD(EXPR_INIT_LIST);
801	RECORD(EXPR_DESIGNATED_INIT);
802	RECORD(EXPR_DESIGNATED_INIT_UPDATE);
803	RECORD(EXPR_IMPLICIT_VALUE_INIT);
804	RECORD(EXPR_NO_INIT);
805	RECORD(EXPR_VA_ARG);
806	RECORD(EXPR_ADDR_LABEL);
807	RECORD(EXPR_STMT);
808	RECORD(EXPR_CHOOSE);
809	RECORD(EXPR_GNU_NULL);
810	RECORD(EXPR_SHUFFLE_VECTOR);
811	RECORD(EXPR_BLOCK);
812	RECORD(EXPR_GENERIC_SELECTION);
813	RECORD(EXPR_OBJC_STRING_LITERAL);
814	RECORD(EXPR_OBJC_BOXED_EXPRESSION);
815	RECORD(EXPR_OBJC_ARRAY_LITERAL);
816	RECORD(EXPR_OBJC_DICTIONARY_LITERAL);
817	RECORD(EXPR_OBJC_ENCODE);
818	RECORD(EXPR_OBJC_SELECTOR_EXPR);
819	RECORD(EXPR_OBJC_PROTOCOL_EXPR);
820	RECORD(EXPR_OBJC_IVAR_REF_EXPR);
821	RECORD(EXPR_OBJC_PROPERTY_REF_EXPR);
822	RECORD(EXPR_OBJC_KVC_REF_EXPR);
823	RECORD(EXPR_OBJC_MESSAGE_EXPR);
824	RECORD(STMT_OBJC_FOR_COLLECTION);
825	RECORD(STMT_OBJC_CATCH);
826	RECORD(STMT_OBJC_FINALLY);
827	RECORD(STMT_OBJC_AT_TRY);
828	RECORD(STMT_OBJC_AT_SYNCHRONIZED);
829	RECORD(STMT_OBJC_AT_THROW);
830	RECORD(EXPR_OBJC_BOOL_LITERAL);
831	RECORD(STMT_CXX_CATCH);
832	RECORD(STMT_CXX_TRY);
833	RECORD(STMT_CXX_FOR_RANGE);
834	RECORD(EXPR_CXX_OPERATOR_CALL);
835	RECORD(EXPR_CXX_MEMBER_CALL);
836	RECORD(EXPR_CXX_REWRITTEN_BINARY_OPERATOR);
837	RECORD(EXPR_CXX_CONSTRUCT);
838	RECORD(EXPR_CXX_TEMPORARY_OBJECT);
839	RECORD(EXPR_CXX_STATIC_CAST);
840	RECORD(EXPR_CXX_DYNAMIC_CAST);
841	RECORD(EXPR_CXX_REINTERPRET_CAST);
842	RECORD(EXPR_CXX_CONST_CAST);
843	RECORD(EXPR_CXX_ADDRSPACE_CAST);
844	RECORD(EXPR_CXX_FUNCTIONAL_CAST);
845	RECORD(EXPR_USER_DEFINED_LITERAL);
846	RECORD(EXPR_CXX_STD_INITIALIZER_LIST);
847	RECORD(EXPR_CXX_BOOL_LITERAL);
848	RECORD(EXPR_CXX_PAREN_LIST_INIT);
849	RECORD(EXPR_CXX_NULL_PTR_LITERAL);
850	RECORD(EXPR_CXX_TYPEID_EXPR);
851	RECORD(EXPR_CXX_TYPEID_TYPE);
852	RECORD(EXPR_CXX_THIS);
853	RECORD(EXPR_CXX_THROW);
854	RECORD(EXPR_CXX_DEFAULT_ARG);
855	RECORD(EXPR_CXX_DEFAULT_INIT);
856	RECORD(EXPR_CXX_BIND_TEMPORARY);
857	RECORD(EXPR_CXX_SCALAR_VALUE_INIT);
858	RECORD(EXPR_CXX_NEW);
859	RECORD(EXPR_CXX_DELETE);
860	RECORD(EXPR_CXX_PSEUDO_DESTRUCTOR);
861	RECORD(EXPR_EXPR_WITH_CLEANUPS);
862	RECORD(EXPR_CXX_DEPENDENT_SCOPE_MEMBER);
863	RECORD(EXPR_CXX_DEPENDENT_SCOPE_DECL_REF);
864	RECORD(EXPR_CXX_UNRESOLVED_CONSTRUCT);
865	RECORD(EXPR_CXX_UNRESOLVED_MEMBER);
866	RECORD(EXPR_CXX_UNRESOLVED_LOOKUP);
867	RECORD(EXPR_CXX_EXPRESSION_TRAIT);
868	RECORD(EXPR_CXX_NOEXCEPT);
869	RECORD(EXPR_OPAQUE_VALUE);
870	RECORD(EXPR_BINARY_CONDITIONAL_OPERATOR);
871	RECORD(EXPR_TYPE_TRAIT);
872	RECORD(EXPR_ARRAY_TYPE_TRAIT);
873	RECORD(EXPR_PACK_EXPANSION);
874	RECORD(EXPR_SIZEOF_PACK);
875	RECORD(EXPR_PACK_INDEXING);
876	RECORD(EXPR_SUBST_NON_TYPE_TEMPLATE_PARM);
877	RECORD(EXPR_SUBST_NON_TYPE_TEMPLATE_PARM_PACK);
878	RECORD(EXPR_FUNCTION_PARM_PACK);
879	RECORD(EXPR_MATERIALIZE_TEMPORARY);
880	RECORD(EXPR_CUDA_KERNEL_CALL);
881	RECORD(EXPR_CXX_UUIDOF_EXPR);
882	RECORD(EXPR_CXX_UUIDOF_TYPE);
883	RECORD(EXPR_LAMBDA);
884	#undef RECORD
885	}
886
887	void ASTWriter::WriteBlockInfoBlock() {
888	RecordData Record;
889	Stream.EnterBlockInfoBlock();
890
891	#define BLOCK(X) EmitBlockID(X ## _ID, #X, Stream, Record)
892	#define RECORD(X) EmitRecordID(X, #X, Stream, Record)
893
894	// Control Block.
895	BLOCK(CONTROL_BLOCK);
896	RECORD(METADATA);
897	RECORD(MODULE_NAME);
898	RECORD(MODULE_DIRECTORY);
899	RECORD(MODULE_MAP_FILE);
900	RECORD(IMPORT);
901	RECORD(ORIGINAL_FILE);
902	RECORD(ORIGINAL_FILE_ID);
903	RECORD(INPUT_FILE_OFFSETS);
904
905	BLOCK(OPTIONS_BLOCK);
906	RECORD(LANGUAGE_OPTIONS);
907	RECORD(TARGET_OPTIONS);
908	RECORD(FILE_SYSTEM_OPTIONS);
909	RECORD(HEADER_SEARCH_OPTIONS);
910	RECORD(PREPROCESSOR_OPTIONS);
911
912	BLOCK(INPUT_FILES_BLOCK);
913	RECORD(INPUT_FILE);
914	RECORD(INPUT_FILE_HASH);
915
916	// AST Top-Level Block.
917	BLOCK(AST_BLOCK);
918	RECORD(TYPE_OFFSET);
919	RECORD(DECL_OFFSET);
920	RECORD(IDENTIFIER_OFFSET);
921	RECORD(IDENTIFIER_TABLE);
922	RECORD(EAGERLY_DESERIALIZED_DECLS);
923	RECORD(MODULAR_CODEGEN_DECLS);
924	RECORD(SPECIAL_TYPES);
925	RECORD(STATISTICS);
926	RECORD(TENTATIVE_DEFINITIONS);
927	RECORD(SELECTOR_OFFSETS);
928	RECORD(METHOD_POOL);
929	RECORD(PP_COUNTER_VALUE);
930	RECORD(SOURCE_LOCATION_OFFSETS);
931	RECORD(EXT_VECTOR_DECLS);
932	RECORD(UNUSED_FILESCOPED_DECLS);
933	RECORD(PPD_ENTITIES_OFFSETS);
934	RECORD(VTABLE_USES);
935	RECORD(PPD_SKIPPED_RANGES);
936	RECORD(REFERENCED_SELECTOR_POOL);
937	RECORD(TU_UPDATE_LEXICAL);
938	RECORD(SEMA_DECL_REFS);
939	RECORD(WEAK_UNDECLARED_IDENTIFIERS);
940	RECORD(PENDING_IMPLICIT_INSTANTIATIONS);
941	RECORD(UPDATE_VISIBLE);
942	RECORD(DELAYED_NAMESPACE_LEXICAL_VISIBLE_RECORD);
943	RECORD(RELATED_DECLS_MAP);
944	RECORD(DECL_UPDATE_OFFSETS);
945	RECORD(DECL_UPDATES);
946	RECORD(CUDA_SPECIAL_DECL_REFS);
947	RECORD(HEADER_SEARCH_TABLE);
948	RECORD(FP_PRAGMA_OPTIONS);
949	RECORD(OPENCL_EXTENSIONS);
950	RECORD(OPENCL_EXTENSION_TYPES);
951	RECORD(OPENCL_EXTENSION_DECLS);
952	RECORD(DELEGATING_CTORS);
953	RECORD(KNOWN_NAMESPACES);
954	RECORD(MODULE_OFFSET_MAP);
955	RECORD(SOURCE_MANAGER_LINE_TABLE);
956	RECORD(OBJC_CATEGORIES_MAP);
957	RECORD(FILE_SORTED_DECLS);
958	RECORD(IMPORTED_MODULES);
959	RECORD(OBJC_CATEGORIES);
960	RECORD(MACRO_OFFSET);
961	RECORD(INTERESTING_IDENTIFIERS);
962	RECORD(UNDEFINED_BUT_USED);
963	RECORD(LATE_PARSED_TEMPLATE);
964	RECORD(OPTIMIZE_PRAGMA_OPTIONS);
965	RECORD(MSSTRUCT_PRAGMA_OPTIONS);
966	RECORD(POINTERS_TO_MEMBERS_PRAGMA_OPTIONS);
967	RECORD(UNUSED_LOCAL_TYPEDEF_NAME_CANDIDATES);
968	RECORD(DELETE_EXPRS_TO_ANALYZE);
969	RECORD(CUDA_PRAGMA_FORCE_HOST_DEVICE_DEPTH);
970	RECORD(PP_CONDITIONAL_STACK);
971	RECORD(DECLS_TO_CHECK_FOR_DEFERRED_DIAGS);
972	RECORD(PP_ASSUME_NONNULL_LOC);
973	RECORD(PP_UNSAFE_BUFFER_USAGE);
974	RECORD(VTABLES_TO_EMIT);
975
976	// SourceManager Block.
977	BLOCK(SOURCE_MANAGER_BLOCK);
978	RECORD(SM_SLOC_FILE_ENTRY);
979	RECORD(SM_SLOC_BUFFER_ENTRY);
980	RECORD(SM_SLOC_BUFFER_BLOB);
981	RECORD(SM_SLOC_BUFFER_BLOB_COMPRESSED);
982	RECORD(SM_SLOC_EXPANSION_ENTRY);
983
984	// Preprocessor Block.
985	BLOCK(PREPROCESSOR_BLOCK);
986	RECORD(PP_MACRO_DIRECTIVE_HISTORY);
987	RECORD(PP_MACRO_FUNCTION_LIKE);
988	RECORD(PP_MACRO_OBJECT_LIKE);
989	RECORD(PP_MODULE_MACRO);
990	RECORD(PP_TOKEN);
991
992	// Submodule Block.
993	BLOCK(SUBMODULE_BLOCK);
994	RECORD(SUBMODULE_METADATA);
995	RECORD(SUBMODULE_DEFINITION);
996	RECORD(SUBMODULE_UMBRELLA_HEADER);
997	RECORD(SUBMODULE_HEADER);
998	RECORD(SUBMODULE_TOPHEADER);
999	RECORD(SUBMODULE_UMBRELLA_DIR);
1000	RECORD(SUBMODULE_IMPORTS);
1001	RECORD(SUBMODULE_AFFECTING_MODULES);
1002	RECORD(SUBMODULE_EXPORTS);
1003	RECORD(SUBMODULE_REQUIRES);
1004	RECORD(SUBMODULE_EXCLUDED_HEADER);
1005	RECORD(SUBMODULE_LINK_LIBRARY);
1006	RECORD(SUBMODULE_CONFIG_MACRO);
1007	RECORD(SUBMODULE_CONFLICT);
1008	RECORD(SUBMODULE_PRIVATE_HEADER);
1009	RECORD(SUBMODULE_TEXTUAL_HEADER);
1010	RECORD(SUBMODULE_PRIVATE_TEXTUAL_HEADER);
1011	RECORD(SUBMODULE_INITIALIZERS);
1012	RECORD(SUBMODULE_EXPORT_AS);
1013
1014	// Comments Block.
1015	BLOCK(COMMENTS_BLOCK);
1016	RECORD(COMMENTS_RAW_COMMENT);
1017
1018	// Decls and Types block.
1019	BLOCK(DECLTYPES_BLOCK);
1020	RECORD(TYPE_EXT_QUAL);
1021	RECORD(TYPE_COMPLEX);
1022	RECORD(TYPE_POINTER);
1023	RECORD(TYPE_BLOCK_POINTER);
1024	RECORD(TYPE_LVALUE_REFERENCE);
1025	RECORD(TYPE_RVALUE_REFERENCE);
1026	RECORD(TYPE_MEMBER_POINTER);
1027	RECORD(TYPE_CONSTANT_ARRAY);
1028	RECORD(TYPE_INCOMPLETE_ARRAY);
1029	RECORD(TYPE_VARIABLE_ARRAY);
1030	RECORD(TYPE_VECTOR);
1031	RECORD(TYPE_EXT_VECTOR);
1032	RECORD(TYPE_FUNCTION_NO_PROTO);
1033	RECORD(TYPE_FUNCTION_PROTO);
1034	RECORD(TYPE_TYPEDEF);
1035	RECORD(TYPE_TYPEOF_EXPR);
1036	RECORD(TYPE_TYPEOF);
1037	RECORD(TYPE_RECORD);
1038	RECORD(TYPE_ENUM);
1039	RECORD(TYPE_OBJC_INTERFACE);
1040	RECORD(TYPE_OBJC_OBJECT_POINTER);
1041	RECORD(TYPE_DECLTYPE);
1042	RECORD(TYPE_ELABORATED);
1043	RECORD(TYPE_SUBST_TEMPLATE_TYPE_PARM);
1044	RECORD(TYPE_UNRESOLVED_USING);
1045	RECORD(TYPE_INJECTED_CLASS_NAME);
1046	RECORD(TYPE_OBJC_OBJECT);
1047	RECORD(TYPE_TEMPLATE_TYPE_PARM);
1048	RECORD(TYPE_TEMPLATE_SPECIALIZATION);
1049	RECORD(TYPE_DEPENDENT_NAME);
1050	RECORD(TYPE_DEPENDENT_TEMPLATE_SPECIALIZATION);
1051	RECORD(TYPE_DEPENDENT_SIZED_ARRAY);
1052	RECORD(TYPE_PAREN);
1053	RECORD(TYPE_MACRO_QUALIFIED);
1054	RECORD(TYPE_PACK_EXPANSION);
1055	RECORD(TYPE_ATTRIBUTED);
1056	RECORD(TYPE_SUBST_TEMPLATE_TYPE_PARM_PACK);
1057	RECORD(TYPE_AUTO);
1058	RECORD(TYPE_UNARY_TRANSFORM);
1059	RECORD(TYPE_ATOMIC);
1060	RECORD(TYPE_DECAYED);
1061	RECORD(TYPE_ADJUSTED);
1062	RECORD(TYPE_OBJC_TYPE_PARAM);
1063	RECORD(LOCAL_REDECLARATIONS);
1064	RECORD(DECL_TYPEDEF);
1065	RECORD(DECL_TYPEALIAS);
1066	RECORD(DECL_ENUM);
1067	RECORD(DECL_RECORD);
1068	RECORD(DECL_ENUM_CONSTANT);
1069	RECORD(DECL_FUNCTION);
1070	RECORD(DECL_OBJC_METHOD);
1071	RECORD(DECL_OBJC_INTERFACE);
1072	RECORD(DECL_OBJC_PROTOCOL);
1073	RECORD(DECL_OBJC_IVAR);
1074	RECORD(DECL_OBJC_AT_DEFS_FIELD);
1075	RECORD(DECL_OBJC_CATEGORY);
1076	RECORD(DECL_OBJC_CATEGORY_IMPL);
1077	RECORD(DECL_OBJC_IMPLEMENTATION);
1078	RECORD(DECL_OBJC_COMPATIBLE_ALIAS);
1079	RECORD(DECL_OBJC_PROPERTY);
1080	RECORD(DECL_OBJC_PROPERTY_IMPL);
1081	RECORD(DECL_FIELD);
1082	RECORD(DECL_MS_PROPERTY);
1083	RECORD(DECL_VAR);
1084	RECORD(DECL_IMPLICIT_PARAM);
1085	RECORD(DECL_PARM_VAR);
1086	RECORD(DECL_FILE_SCOPE_ASM);
1087	RECORD(DECL_BLOCK);
1088	RECORD(DECL_CONTEXT_LEXICAL);
1089	RECORD(DECL_CONTEXT_VISIBLE);
1090	RECORD(DECL_CONTEXT_MODULE_LOCAL_VISIBLE);
1091	RECORD(DECL_NAMESPACE);
1092	RECORD(DECL_NAMESPACE_ALIAS);
1093	RECORD(DECL_USING);
1094	RECORD(DECL_USING_SHADOW);
1095	RECORD(DECL_USING_DIRECTIVE);
1096	RECORD(DECL_UNRESOLVED_USING_VALUE);
1097	RECORD(DECL_UNRESOLVED_USING_TYPENAME);
1098	RECORD(DECL_LINKAGE_SPEC);
1099	RECORD(DECL_EXPORT);
1100	RECORD(DECL_CXX_RECORD);
1101	RECORD(DECL_CXX_METHOD);
1102	RECORD(DECL_CXX_CONSTRUCTOR);
1103	RECORD(DECL_CXX_DESTRUCTOR);
1104	RECORD(DECL_CXX_CONVERSION);
1105	RECORD(DECL_ACCESS_SPEC);
1106	RECORD(DECL_FRIEND);
1107	RECORD(DECL_FRIEND_TEMPLATE);
1108	RECORD(DECL_CLASS_TEMPLATE);
1109	RECORD(DECL_CLASS_TEMPLATE_SPECIALIZATION);
1110	RECORD(DECL_CLASS_TEMPLATE_PARTIAL_SPECIALIZATION);
1111	RECORD(DECL_VAR_TEMPLATE);
1112	RECORD(DECL_VAR_TEMPLATE_SPECIALIZATION);
1113	RECORD(DECL_VAR_TEMPLATE_PARTIAL_SPECIALIZATION);
1114	RECORD(DECL_FUNCTION_TEMPLATE);
1115	RECORD(DECL_TEMPLATE_TYPE_PARM);
1116	RECORD(DECL_NON_TYPE_TEMPLATE_PARM);
1117	RECORD(DECL_TEMPLATE_TEMPLATE_PARM);
1118	RECORD(DECL_CONCEPT);
1119	RECORD(DECL_REQUIRES_EXPR_BODY);
1120	RECORD(DECL_TYPE_ALIAS_TEMPLATE);
1121	RECORD(DECL_STATIC_ASSERT);
1122	RECORD(DECL_CXX_BASE_SPECIFIERS);
1123	RECORD(DECL_CXX_CTOR_INITIALIZERS);
1124	RECORD(DECL_INDIRECTFIELD);
1125	RECORD(DECL_EXPANDED_NON_TYPE_TEMPLATE_PARM_PACK);
1126	RECORD(DECL_EXPANDED_TEMPLATE_TEMPLATE_PARM_PACK);
1127	RECORD(DECL_IMPORT);
1128	RECORD(DECL_OMP_THREADPRIVATE);
1129	RECORD(DECL_EMPTY);
1130	RECORD(DECL_OBJC_TYPE_PARAM);
1131	RECORD(DECL_OMP_CAPTUREDEXPR);
1132	RECORD(DECL_PRAGMA_COMMENT);
1133	RECORD(DECL_PRAGMA_DETECT_MISMATCH);
1134	RECORD(DECL_OMP_DECLARE_REDUCTION);
1135	RECORD(DECL_OMP_ALLOCATE);
1136	RECORD(DECL_HLSL_BUFFER);
1137	RECORD(DECL_OPENACC_DECLARE);
1138	RECORD(DECL_OPENACC_ROUTINE);
1139
1140	// Statements and Exprs can occur in the Decls and Types block.
1141	AddStmtsExprs(Stream, Record);
1142
1143	BLOCK(PREPROCESSOR_DETAIL_BLOCK);
1144	RECORD(PPD_MACRO_EXPANSION);
1145	RECORD(PPD_MACRO_DEFINITION);
1146	RECORD(PPD_INCLUSION_DIRECTIVE);
1147
1148	// Decls and Types block.
1149	BLOCK(EXTENSION_BLOCK);
1150	RECORD(EXTENSION_METADATA);
1151
1152	BLOCK(UNHASHED_CONTROL_BLOCK);
1153	RECORD(SIGNATURE);
1154	RECORD(AST_BLOCK_HASH);
1155	RECORD(DIAGNOSTIC_OPTIONS);
1156	RECORD(HEADER_SEARCH_PATHS);
1157	RECORD(DIAG_PRAGMA_MAPPINGS);
1158	RECORD(HEADER_SEARCH_ENTRY_USAGE);
1159	RECORD(VFS_USAGE);
1160
1161	#undef RECORD
1162	#undef BLOCK
1163	Stream.ExitBlock();
1164	}
1165
1166	/// Prepares a path for being written to an AST file by converting it
1167	/// to an absolute path and removing nested './'s.
1168	///
1169	/// \return \c true if the path was changed.
1170	static bool cleanPathForOutput(FileManager &FileMgr,
1171	SmallVectorImpl<char> &Path) {
1172	bool Changed = FileMgr.makeAbsolutePath(Path);
1173	return Changed | llvm::sys::path::remove_dots(path&: Path);
1174	}
1175
1176	/// Adjusts the given filename to only write out the portion of the
1177	/// filename that is not part of the system root directory.
1178	///
1179	/// \param Filename the file name to adjust.
1180	///
1181	/// \param BaseDir When non-NULL, the PCH file is a relocatable AST file and
1182	/// the returned filename will be adjusted by this root directory.
1183	///
1184	/// \returns either the original filename (if it needs no adjustment) or the
1185	/// adjusted filename (which points into the @p Filename parameter).
1186	static const char *
1187	adjustFilenameForRelocatableAST(const char *Filename, StringRef BaseDir) {
1188	assert(Filename && "No file name to adjust?");
1189
1190	if (BaseDir.empty())
1191	return Filename;
1192
1193	// Verify that the filename and the system root have the same prefix.
1194	unsigned Pos = 0;
1195	for (; Filename[Pos] && Pos < BaseDir.size(); ++Pos)
1196	if (Filename[Pos] != BaseDir[Pos])
1197	return Filename; // Prefixes don't match.
1198
1199	// We hit the end of the filename before we hit the end of the system root.
1200	if (!Filename[Pos])
1201	return Filename;
1202
1203	// If there's not a path separator at the end of the base directory nor
1204	// immediately after it, then this isn't within the base directory.
1205	if (!llvm::sys::path::is_separator(value: Filename[Pos])) {
1206	if (!llvm::sys::path::is_separator(value: BaseDir.back()))
1207	return Filename;
1208	} else {
1209	// If the file name has a '/' at the current position, skip over the '/'.
1210	// We distinguish relative paths from absolute paths by the
1211	// absence of '/' at the beginning of relative paths.
1212	//
1213	// FIXME: This is wrong. We distinguish them by asking if the path is
1214	// absolute, which isn't the same thing. And there might be multiple '/'s
1215	// in a row. Use a better mechanism to indicate whether we have emitted an
1216	// absolute or relative path.
1217	++Pos;
1218	}
1219
1220	return Filename + Pos;
1221	}
1222
1223	std::pair<ASTFileSignature, ASTFileSignature>
1224	ASTWriter::createSignature() const {
1225	StringRef AllBytes(Buffer.data(), Buffer.size());
1226
1227	llvm::SHA1 Hasher;
1228	Hasher.update(Str: AllBytes.slice(Start: ASTBlockRange.first, End: ASTBlockRange.second));
1229	ASTFileSignature ASTBlockHash = ASTFileSignature::create(Bytes: Hasher.result());
1230
1231	// Add the remaining bytes:
1232	// 1. Before the unhashed control block.
1233	Hasher.update(Str: AllBytes.slice(Start: 0, End: UnhashedControlBlockRange.first));
1234	// 2. Between the unhashed control block and the AST block.
1235	Hasher.update(
1236	Str: AllBytes.slice(Start: UnhashedControlBlockRange.second, End: ASTBlockRange.first));
1237	// 3. After the AST block.
1238	Hasher.update(Str: AllBytes.substr(Start: ASTBlockRange.second));
1239	ASTFileSignature Signature = ASTFileSignature::create(Bytes: Hasher.result());
1240
1241	return std::make_pair(x&: ASTBlockHash, y&: Signature);
1242	}
1243
1244	ASTFileSignature ASTWriter::createSignatureForNamedModule() const {
1245	llvm::SHA1 Hasher;
1246	Hasher.update(Str: StringRef(Buffer.data(), Buffer.size()));
1247
1248	assert(WritingModule);
1249	assert(WritingModule->isNamedModule());
1250
1251	// We need to combine all the export imported modules no matter
1252	// we used it or not.
1253	for (auto [ExportImported, _] : WritingModule->Exports)
1254	Hasher.update(Data: ExportImported->Signature);
1255
1256	// We combine all the used modules to make sure the signature is precise.
1257	// Consider the case like:
1258	//
1259	// // a.cppm
1260	// export module a;
1261	// export inline int a() { ... }
1262	//
1263	// // b.cppm
1264	// export module b;
1265	// import a;
1266	// export inline int b() { return a(); }
1267	//
1268	// Since both `a()` and `b()` are inline, we need to make sure the BMI of
1269	// `b.pcm` will change after the implementation of `a()` changes. We can't
1270	// get that naturally since we won't record the body of `a()` during the
1271	// writing process. We can't reuse ODRHash here since ODRHash won't calculate
1272	// the called function recursively. So ODRHash will be problematic if `a()`
1273	// calls other inline functions.
1274	//
1275	// Probably we can solve this by a new hash mechanism. But the safety and
1276	// efficiency may a problem too. Here we just combine the hash value of the
1277	// used modules conservatively.
1278	for (Module *M : TouchedTopLevelModules)
1279	Hasher.update(Data: M->Signature);
1280
1281	return ASTFileSignature::create(Bytes: Hasher.result());
1282	}
1283
1284	static void BackpatchSignatureAt(llvm::BitstreamWriter &Stream,
1285	const ASTFileSignature &S, uint64_t BitNo) {
1286	for (uint8_t Byte : S) {
1287	Stream.BackpatchByte(BitNo, NewByte: Byte);
1288	BitNo += 8;
1289	}
1290	}
1291
1292	ASTFileSignature ASTWriter::backpatchSignature() {
1293	if (isWritingStdCXXNamedModules()) {
1294	ASTFileSignature Signature = createSignatureForNamedModule();
1295	BackpatchSignatureAt(Stream, S: Signature, BitNo: SignatureOffset);
1296	return Signature;
1297	}
1298
1299	if (!WritingModule ||
1300	!PP->getHeaderSearchInfo().getHeaderSearchOpts().ModulesHashContent)
1301	return {};
1302
1303	// For implicit modules, write the hash of the PCM as its signature.
1304	ASTFileSignature ASTBlockHash;
1305	ASTFileSignature Signature;
1306	std::tie(args&: ASTBlockHash, args&: Signature) = createSignature();
1307
1308	BackpatchSignatureAt(Stream, S: ASTBlockHash, BitNo: ASTBlockHashOffset);
1309	BackpatchSignatureAt(Stream, S: Signature, BitNo: SignatureOffset);
1310
1311	return Signature;
1312	}
1313
1314	void ASTWriter::writeUnhashedControlBlock(Preprocessor &PP) {
1315	using namespace llvm;
1316
1317	// Flush first to prepare the PCM hash (signature).
1318	Stream.FlushToWord();
1319	UnhashedControlBlockRange.first = Stream.GetCurrentBitNo() >> 3;
1320
1321	// Enter the block and prepare to write records.
1322	RecordData Record;
1323	Stream.EnterSubblock(BlockID: UNHASHED_CONTROL_BLOCK_ID, CodeLen: 5);
1324
1325	// For implicit modules and C++20 named modules, write the hash of the PCM as
1326	// its signature.
1327	if (isWritingStdCXXNamedModules() ||
1328	(WritingModule &&
1329	PP.getHeaderSearchInfo().getHeaderSearchOpts().ModulesHashContent)) {
1330	// At this point, we don't know the actual signature of the file or the AST
1331	// block - we're only able to compute those at the end of the serialization
1332	// process. Let's store dummy signatures for now, and replace them with the
1333	// real ones later on.
1334	// The bitstream VBR-encodes record elements, which makes backpatching them
1335	// really difficult. Let's store the signatures as blobs instead - they are
1336	// guaranteed to be word-aligned, and we control their format/encoding.
1337	auto Dummy = ASTFileSignature::createDummy();
1338	SmallString<128> Blob{Dummy.begin(), Dummy.end()};
1339
1340	// We don't need AST Block hash in named modules.
1341	if (!isWritingStdCXXNamedModules()) {
1342	auto Abbrev = std::make_shared<BitCodeAbbrev>();
1343	Abbrev->Add(OpInfo: BitCodeAbbrevOp(AST_BLOCK_HASH));
1344	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
1345	unsigned ASTBlockHashAbbrev = Stream.EmitAbbrev(Abbv: std::move(Abbrev));
1346
1347	Record.push_back(Elt: AST_BLOCK_HASH);
1348	Stream.EmitRecordWithBlob(Abbrev: ASTBlockHashAbbrev, Vals: Record, Blob);
1349	ASTBlockHashOffset = Stream.GetCurrentBitNo() - Blob.size() * 8;
1350	Record.clear();
1351	}
1352
1353	auto Abbrev = std::make_shared<BitCodeAbbrev>();
1354	Abbrev->Add(OpInfo: BitCodeAbbrevOp(SIGNATURE));
1355	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
1356	unsigned SignatureAbbrev = Stream.EmitAbbrev(Abbv: std::move(Abbrev));
1357
1358	Record.push_back(Elt: SIGNATURE);
1359	Stream.EmitRecordWithBlob(Abbrev: SignatureAbbrev, Vals: Record, Blob);
1360	SignatureOffset = Stream.GetCurrentBitNo() - Blob.size() * 8;
1361	Record.clear();
1362	}
1363
1364	const auto &HSOpts = PP.getHeaderSearchInfo().getHeaderSearchOpts();
1365
1366	// Diagnostic options.
1367	const auto &Diags = PP.getDiagnostics();
1368	const DiagnosticOptions &DiagOpts = Diags.getDiagnosticOptions();
1369	if (!HSOpts.ModulesSkipDiagnosticOptions) {
1370	#define DIAGOPT(Name, Bits, Default) Record.push_back(DiagOpts.Name);
1371	#define ENUM_DIAGOPT(Name, Type, Bits, Default) \
1372	Record.push_back(static_cast<unsigned>(DiagOpts.get##Name()));
1373	#include "clang/Basic/DiagnosticOptions.def"
1374	Record.push_back(Elt: DiagOpts.Warnings.size());
1375	for (unsigned I = 0, N = DiagOpts.Warnings.size(); I != N; ++I)
1376	AddString(Str: DiagOpts.Warnings[I], Record);
1377	Record.push_back(Elt: DiagOpts.Remarks.size());
1378	for (unsigned I = 0, N = DiagOpts.Remarks.size(); I != N; ++I)
1379	AddString(Str: DiagOpts.Remarks[I], Record);
1380	// Note: we don't serialize the log or serialization file names, because
1381	// they are generally transient files and will almost always be overridden.
1382	Stream.EmitRecord(Code: DIAGNOSTIC_OPTIONS, Vals: Record);
1383	Record.clear();
1384	}
1385
1386	// Header search paths.
1387	if (!HSOpts.ModulesSkipHeaderSearchPaths) {
1388	// Include entries.
1389	Record.push_back(Elt: HSOpts.UserEntries.size());
1390	for (unsigned I = 0, N = HSOpts.UserEntries.size(); I != N; ++I) {
1391	const HeaderSearchOptions::Entry &Entry = HSOpts.UserEntries[I];
1392	AddString(Str: Entry.Path, Record);
1393	Record.push_back(Elt: static_cast<unsigned>(Entry.Group));
1394	Record.push_back(Elt: Entry.IsFramework);
1395	Record.push_back(Elt: Entry.IgnoreSysRoot);
1396	}
1397
1398	// System header prefixes.
1399	Record.push_back(Elt: HSOpts.SystemHeaderPrefixes.size());
1400	for (unsigned I = 0, N = HSOpts.SystemHeaderPrefixes.size(); I != N; ++I) {
1401	AddString(Str: HSOpts.SystemHeaderPrefixes[I].Prefix, Record);
1402	Record.push_back(Elt: HSOpts.SystemHeaderPrefixes[I].IsSystemHeader);
1403	}
1404
1405	// VFS overlay files.
1406	Record.push_back(Elt: HSOpts.VFSOverlayFiles.size());
1407	for (StringRef VFSOverlayFile : HSOpts.VFSOverlayFiles)
1408	AddString(Str: VFSOverlayFile, Record);
1409
1410	Stream.EmitRecord(Code: HEADER_SEARCH_PATHS, Vals: Record);
1411	}
1412
1413	if (!HSOpts.ModulesSkipPragmaDiagnosticMappings)
1414	WritePragmaDiagnosticMappings(Diag: Diags, /* isModule = */ WritingModule);
1415
1416	// Header search entry usage.
1417	{
1418	auto HSEntryUsage = PP.getHeaderSearchInfo().computeUserEntryUsage();
1419	auto Abbrev = std::make_shared<BitCodeAbbrev>();
1420	Abbrev->Add(OpInfo: BitCodeAbbrevOp(HEADER_SEARCH_ENTRY_USAGE));
1421	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // Number of bits.
1422	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Bit vector.
1423	unsigned HSUsageAbbrevCode = Stream.EmitAbbrev(Abbv: std::move(Abbrev));
1424	RecordData::value_type Record[] = {HEADER_SEARCH_ENTRY_USAGE,
1425	HSEntryUsage.size()};
1426	Stream.EmitRecordWithBlob(Abbrev: HSUsageAbbrevCode, Vals: Record, Blob: bytes(V: HSEntryUsage));
1427	}
1428
1429	// VFS usage.
1430	{
1431	auto VFSUsage = PP.getHeaderSearchInfo().collectVFSUsageAndClear();
1432	auto Abbrev = std::make_shared<BitCodeAbbrev>();
1433	Abbrev->Add(OpInfo: BitCodeAbbrevOp(VFS_USAGE));
1434	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // Number of bits.
1435	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Bit vector.
1436	unsigned VFSUsageAbbrevCode = Stream.EmitAbbrev(Abbv: std::move(Abbrev));
1437	RecordData::value_type Record[] = {VFS_USAGE, VFSUsage.size()};
1438	Stream.EmitRecordWithBlob(Abbrev: VFSUsageAbbrevCode, Vals: Record, Blob: bytes(V: VFSUsage));
1439	}
1440
1441	// Leave the options block.
1442	Stream.ExitBlock();
1443	UnhashedControlBlockRange.second = Stream.GetCurrentBitNo() >> 3;
1444	}
1445
1446	/// Write the control block.
1447	void ASTWriter::WriteControlBlock(Preprocessor &PP, StringRef isysroot) {
1448	using namespace llvm;
1449
1450	SourceManager &SourceMgr = PP.getSourceManager();
1451	FileManager &FileMgr = PP.getFileManager();
1452
1453	Stream.EnterSubblock(BlockID: CONTROL_BLOCK_ID, CodeLen: 5);
1454	RecordData Record;
1455
1456	// Metadata
1457	auto MetadataAbbrev = std::make_shared<BitCodeAbbrev>();
1458	MetadataAbbrev->Add(OpInfo: BitCodeAbbrevOp(METADATA));
1459	MetadataAbbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 16)); // Major
1460	MetadataAbbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 16)); // Minor
1461	MetadataAbbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 16)); // Clang maj.
1462	MetadataAbbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 16)); // Clang min.
1463	MetadataAbbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Relocatable
1464	// Standard C++ module
1465	MetadataAbbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1));
1466	MetadataAbbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Timestamps
1467	MetadataAbbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Errors
1468	MetadataAbbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // SVN branch/tag
1469	unsigned MetadataAbbrevCode = Stream.EmitAbbrev(Abbv: std::move(MetadataAbbrev));
1470	assert((!WritingModule || isysroot.empty()) &&
1471	"writing module as a relocatable PCH?");
1472	{
1473	RecordData::value_type Record[] = {METADATA,
1474	VERSION_MAJOR,
1475	VERSION_MINOR,
1476	CLANG_VERSION_MAJOR,
1477	CLANG_VERSION_MINOR,
1478	!isysroot.empty(),
1479	isWritingStdCXXNamedModules(),
1480	IncludeTimestamps,
1481	ASTHasCompilerErrors};
1482	Stream.EmitRecordWithBlob(Abbrev: MetadataAbbrevCode, Vals: Record,
1483	Blob: getClangFullRepositoryVersion());
1484	}
1485
1486	if (WritingModule) {
1487	// Module name
1488	auto Abbrev = std::make_shared<BitCodeAbbrev>();
1489	Abbrev->Add(OpInfo: BitCodeAbbrevOp(MODULE_NAME));
1490	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Name
1491	unsigned AbbrevCode = Stream.EmitAbbrev(Abbv: std::move(Abbrev));
1492	RecordData::value_type Record[] = {MODULE_NAME};
1493	Stream.EmitRecordWithBlob(Abbrev: AbbrevCode, Vals: Record, Blob: WritingModule->Name);
1494
1495	auto BaseDir = [&]() -> std::optional<SmallString<128>> {
1496	if (PP.getHeaderSearchInfo().getHeaderSearchOpts().ModuleFileHomeIsCwd) {
1497	// Use the current working directory as the base path for all inputs.
1498	auto CWD = FileMgr.getOptionalDirectoryRef(DirName: ".");
1499	return CWD->getName();
1500	}
1501	if (WritingModule->Directory) {
1502	return WritingModule->Directory->getName();
1503	}
1504	return std::nullopt;
1505	}();
1506	if (BaseDir) {
1507	cleanPathForOutput(FileMgr, Path&: *BaseDir);
1508
1509	// If the home of the module is the current working directory, then we
1510	// want to pick up the cwd of the build process loading the module, not
1511	// our cwd, when we load this module.
1512	if (!PP.getHeaderSearchInfo().getHeaderSearchOpts().ModuleFileHomeIsCwd &&
1513	(!PP.getHeaderSearchInfo()
1514	.getHeaderSearchOpts()
1515	.ModuleMapFileHomeIsCwd ||
1516	WritingModule->Directory->getName() != ".")) {
1517	// Module directory.
1518	auto Abbrev = std::make_shared<BitCodeAbbrev>();
1519	Abbrev->Add(OpInfo: BitCodeAbbrevOp(MODULE_DIRECTORY));
1520	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Directory
1521	unsigned AbbrevCode = Stream.EmitAbbrev(Abbv: std::move(Abbrev));
1522
1523	RecordData::value_type Record[] = {MODULE_DIRECTORY};
1524	Stream.EmitRecordWithBlob(Abbrev: AbbrevCode, Vals: Record, Blob: *BaseDir);
1525	}
1526
1527	// Write out all other paths relative to the base directory if possible.
1528	BaseDirectory.assign(first: BaseDir->begin(), last: BaseDir->end());
1529	} else if (!isysroot.empty()) {
1530	// Write out paths relative to the sysroot if possible.
1531	BaseDirectory = std::string(isysroot);
1532	}
1533	}
1534
1535	// Module map file
1536	if (WritingModule && WritingModule->Kind == Module::ModuleMapModule) {
1537	Record.clear();
1538
1539	auto &Map = PP.getHeaderSearchInfo().getModuleMap();
1540	AddPath(Path: WritingModule->PresumedModuleMapFile.empty()
1541	? Map.getModuleMapFileForUniquing(M: WritingModule)
1542	->getNameAsRequested()
1543	: StringRef(WritingModule->PresumedModuleMapFile),
1544	Record);
1545
1546	// Additional module map files.
1547	if (auto *AdditionalModMaps =
1548	Map.getAdditionalModuleMapFiles(M: WritingModule)) {
1549	Record.push_back(Elt: AdditionalModMaps->size());
1550	SmallVector<FileEntryRef, 1> ModMaps(AdditionalModMaps->begin(),
1551	AdditionalModMaps->end());
1552	llvm::sort(C&: ModMaps, Comp: [](FileEntryRef A, FileEntryRef B) {
1553	return A.getName() < B.getName();
1554	});
1555	for (FileEntryRef F : ModMaps)
1556	AddPath(Path: F.getName(), Record);
1557	} else {
1558	Record.push_back(Elt: 0);
1559	}
1560
1561	Stream.EmitRecord(Code: MODULE_MAP_FILE, Vals: Record);
1562	}
1563
1564	// Imports
1565	if (Chain) {
1566	auto Abbrev = std::make_shared<BitCodeAbbrev>();
1567	Abbrev->Add(OpInfo: BitCodeAbbrevOp(IMPORT));
1568	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // Kind
1569	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ImportLoc
1570	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Module name len
1571	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Standard C++ mod
1572	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // File size
1573	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // File timestamp
1574	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // File name len
1575	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Strings
1576	unsigned AbbrevCode = Stream.EmitAbbrev(Abbv: std::move(Abbrev));
1577
1578	SmallString<128> Blob;
1579
1580	for (ModuleFile &M : Chain->getModuleManager()) {
1581	// Skip modules that weren't directly imported.
1582	if (!M.isDirectlyImported())
1583	continue;
1584
1585	Record.clear();
1586	Blob.clear();
1587
1588	Record.push_back(Elt: IMPORT);
1589	Record.push_back(Elt: (unsigned)M.Kind); // FIXME: Stable encoding
1590	AddSourceLocation(Loc: M.ImportLoc, Record);
1591	AddStringBlob(Str: M.ModuleName, Record, Blob);
1592	Record.push_back(Elt: M.StandardCXXModule);
1593
1594	// We don't want to hard code the information about imported modules
1595	// in the C++20 named modules.
1596	if (M.StandardCXXModule) {
1597	Record.push_back(Elt: 0);
1598	Record.push_back(Elt: 0);
1599	Record.push_back(Elt: 0);
1600	} else {
1601	// If we have calculated signature, there is no need to store
1602	// the size or timestamp.
1603	Record.push_back(Elt: M.Signature ? 0 : M.File.getSize());
1604	Record.push_back(Elt: M.Signature ? 0 : getTimestampForOutput(E: M.File));
1605
1606	llvm::append_range(C&: Blob, R&: M.Signature);
1607
1608	AddPathBlob(Str: M.FileName, Record, Blob);
1609	}
1610
1611	Stream.EmitRecordWithBlob(Abbrev: AbbrevCode, Vals: Record, Blob);
1612	}
1613	}
1614
1615	// Write the options block.
1616	Stream.EnterSubblock(BlockID: OPTIONS_BLOCK_ID, CodeLen: 4);
1617
1618	// Language options.
1619	Record.clear();
1620	const LangOptions &LangOpts = PP.getLangOpts();
1621	#define LANGOPT(Name, Bits, Default, Description) \
1622	Record.push_back(LangOpts.Name);
1623	#define ENUM_LANGOPT(Name, Type, Bits, Default, Description) \
1624	Record.push_back(static_cast<unsigned>(LangOpts.get##Name()));
1625	#include "clang/Basic/LangOptions.def"
1626	#define SANITIZER(NAME, ID) \
1627	Record.push_back(LangOpts.Sanitize.has(SanitizerKind::ID));
1628	#include "clang/Basic/Sanitizers.def"
1629
1630	Record.push_back(Elt: LangOpts.ModuleFeatures.size());
1631	for (StringRef Feature : LangOpts.ModuleFeatures)
1632	AddString(Str: Feature, Record);
1633
1634	Record.push_back(Elt: (unsigned) LangOpts.ObjCRuntime.getKind());
1635	AddVersionTuple(Version: LangOpts.ObjCRuntime.getVersion(), Record);
1636
1637	AddString(Str: LangOpts.CurrentModule, Record);
1638
1639	// Comment options.
1640	Record.push_back(Elt: LangOpts.CommentOpts.BlockCommandNames.size());
1641	for (const auto &I : LangOpts.CommentOpts.BlockCommandNames) {
1642	AddString(Str: I, Record);
1643	}
1644	Record.push_back(Elt: LangOpts.CommentOpts.ParseAllComments);
1645
1646	// OpenMP offloading options.
1647	Record.push_back(Elt: LangOpts.OMPTargetTriples.size());
1648	for (auto &T : LangOpts.OMPTargetTriples)
1649	AddString(Str: T.getTriple(), Record);
1650
1651	AddString(Str: LangOpts.OMPHostIRFile, Record);
1652
1653	Stream.EmitRecord(Code: LANGUAGE_OPTIONS, Vals: Record);
1654
1655	// Target options.
1656	Record.clear();
1657	const TargetInfo &Target = PP.getTargetInfo();
1658	const TargetOptions &TargetOpts = Target.getTargetOpts();
1659	AddString(Str: TargetOpts.Triple, Record);
1660	AddString(Str: TargetOpts.CPU, Record);
1661	AddString(Str: TargetOpts.TuneCPU, Record);
1662	AddString(Str: TargetOpts.ABI, Record);
1663	Record.push_back(Elt: TargetOpts.FeaturesAsWritten.size());
1664	for (unsigned I = 0, N = TargetOpts.FeaturesAsWritten.size(); I != N; ++I) {
1665	AddString(Str: TargetOpts.FeaturesAsWritten[I], Record);
1666	}
1667	Record.push_back(Elt: TargetOpts.Features.size());
1668	for (unsigned I = 0, N = TargetOpts.Features.size(); I != N; ++I) {
1669	AddString(Str: TargetOpts.Features[I], Record);
1670	}
1671	Stream.EmitRecord(Code: TARGET_OPTIONS, Vals: Record);
1672
1673	// File system options.
1674	Record.clear();
1675	const FileSystemOptions &FSOpts = FileMgr.getFileSystemOpts();
1676	AddString(Str: FSOpts.WorkingDir, Record);
1677	Stream.EmitRecord(Code: FILE_SYSTEM_OPTIONS, Vals: Record);
1678
1679	// Header search options.
1680	Record.clear();
1681	const HeaderSearchOptions &HSOpts =
1682	PP.getHeaderSearchInfo().getHeaderSearchOpts();
1683
1684	AddString(Str: HSOpts.Sysroot, Record);
1685	AddString(Str: HSOpts.ResourceDir, Record);
1686	AddString(Str: HSOpts.ModuleCachePath, Record);
1687	AddString(Str: HSOpts.ModuleUserBuildPath, Record);
1688	Record.push_back(Elt: HSOpts.DisableModuleHash);
1689	Record.push_back(Elt: HSOpts.ImplicitModuleMaps);
1690	Record.push_back(Elt: HSOpts.ModuleMapFileHomeIsCwd);
1691	Record.push_back(Elt: HSOpts.EnablePrebuiltImplicitModules);
1692	Record.push_back(Elt: HSOpts.UseBuiltinIncludes);
1693	Record.push_back(Elt: HSOpts.UseStandardSystemIncludes);
1694	Record.push_back(Elt: HSOpts.UseStandardCXXIncludes);
1695	Record.push_back(Elt: HSOpts.UseLibcxx);
1696	// Write out the specific module cache path that contains the module files.
1697	AddString(Str: PP.getHeaderSearchInfo().getModuleCachePath(), Record);
1698	Stream.EmitRecord(Code: HEADER_SEARCH_OPTIONS, Vals: Record);
1699
1700	// Preprocessor options.
1701	Record.clear();
1702	const PreprocessorOptions &PPOpts = PP.getPreprocessorOpts();
1703
1704	// If we're building an implicit module with a context hash, the importer is
1705	// guaranteed to have the same macros defined on the command line. Skip
1706	// writing them.
1707	bool SkipMacros = BuildingImplicitModule && !HSOpts.DisableModuleHash;
1708	bool WriteMacros = !SkipMacros;
1709	Record.push_back(Elt: WriteMacros);
1710	if (WriteMacros) {
1711	// Macro definitions.
1712	Record.push_back(Elt: PPOpts.Macros.size());
1713	for (unsigned I = 0, N = PPOpts.Macros.size(); I != N; ++I) {
1714	AddString(Str: PPOpts.Macros[I].first, Record);
1715	Record.push_back(Elt: PPOpts.Macros[I].second);
1716	}
1717	}
1718
1719	// Includes
1720	Record.push_back(Elt: PPOpts.Includes.size());
1721	for (unsigned I = 0, N = PPOpts.Includes.size(); I != N; ++I)
1722	AddString(Str: PPOpts.Includes[I], Record);
1723
1724	// Macro includes
1725	Record.push_back(Elt: PPOpts.MacroIncludes.size());
1726	for (unsigned I = 0, N = PPOpts.MacroIncludes.size(); I != N; ++I)
1727	AddString(Str: PPOpts.MacroIncludes[I], Record);
1728
1729	Record.push_back(Elt: PPOpts.UsePredefines);
1730	// Detailed record is important since it is used for the module cache hash.
1731	Record.push_back(Elt: PPOpts.DetailedRecord);
1732	AddString(Str: PPOpts.ImplicitPCHInclude, Record);
1733	Record.push_back(Elt: static_cast<unsigned>(PPOpts.ObjCXXARCStandardLibrary));
1734	Stream.EmitRecord(Code: PREPROCESSOR_OPTIONS, Vals: Record);
1735
1736	// Leave the options block.
1737	Stream.ExitBlock();
1738
1739	// Original file name and file ID
1740	if (auto MainFile =
1741	SourceMgr.getFileEntryRefForID(FID: SourceMgr.getMainFileID())) {
1742	auto FileAbbrev = std::make_shared<BitCodeAbbrev>();
1743	FileAbbrev->Add(OpInfo: BitCodeAbbrevOp(ORIGINAL_FILE));
1744	FileAbbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // File ID
1745	FileAbbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // File name
1746	unsigned FileAbbrevCode = Stream.EmitAbbrev(Abbv: std::move(FileAbbrev));
1747
1748	Record.clear();
1749	Record.push_back(Elt: ORIGINAL_FILE);
1750	AddFileID(FID: SourceMgr.getMainFileID(), Record);
1751	EmitRecordWithPath(Abbrev: FileAbbrevCode, Record, Path: MainFile->getName());
1752	}
1753
1754	Record.clear();
1755	AddFileID(FID: SourceMgr.getMainFileID(), Record);
1756	Stream.EmitRecord(Code: ORIGINAL_FILE_ID, Vals: Record);
1757
1758	WriteInputFiles(SourceMgr);
1759	Stream.ExitBlock();
1760	}
1761
1762	namespace {
1763
1764	/// An input file.
1765	struct InputFileEntry {
1766	FileEntryRef File;
1767	bool IsSystemFile;
1768	bool IsTransient;
1769	bool BufferOverridden;
1770	bool IsTopLevel;
1771	bool IsModuleMap;
1772	uint32_t ContentHash[2];
1773
1774	InputFileEntry(FileEntryRef File) : File(File) {}
1775
1776	void trySetContentHash(
1777	Preprocessor &PP,
1778	llvm::function_ref<std::optional<llvm::MemoryBufferRef>()> GetMemBuff) {
1779	ContentHash[0] = 0;
1780	ContentHash[1] = 0;
1781
1782	if (!PP.getHeaderSearchInfo()
1783	.getHeaderSearchOpts()
1784	.ValidateASTInputFilesContent)
1785	return;
1786
1787	auto MemBuff = GetMemBuff();
1788	if (!MemBuff) {
1789	PP.Diag(SourceLocation(), diag::err_module_unable_to_hash_content)
1790	<< File.getName();
1791	return;
1792	}
1793
1794	uint64_t Hash = xxh3_64bits(data: MemBuff->getBuffer());
1795	ContentHash[0] = uint32_t(Hash);
1796	ContentHash[1] = uint32_t(Hash >> 32);
1797	}
1798	};
1799
1800	} // namespace
1801
1802	SourceLocation ASTWriter::getAffectingIncludeLoc(const SourceManager &SourceMgr,
1803	const SrcMgr::FileInfo &File) {
1804	SourceLocation IncludeLoc = File.getIncludeLoc();
1805	if (IncludeLoc.isValid()) {
1806	FileID IncludeFID = SourceMgr.getFileID(SpellingLoc: IncludeLoc);
1807	assert(IncludeFID.isValid() && "IncludeLoc in invalid file");
1808	if (!IsSLocAffecting[IncludeFID.ID])
1809	IncludeLoc = SourceLocation();
1810	}
1811	return IncludeLoc;
1812	}
1813
1814	void ASTWriter::WriteInputFiles(SourceManager &SourceMgr) {
1815	using namespace llvm;
1816
1817	Stream.EnterSubblock(BlockID: INPUT_FILES_BLOCK_ID, CodeLen: 4);
1818
1819	// Create input-file abbreviation.
1820	auto IFAbbrev = std::make_shared<BitCodeAbbrev>();
1821	IFAbbrev->Add(OpInfo: BitCodeAbbrevOp(INPUT_FILE));
1822	IFAbbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ID
1823	IFAbbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 12)); // Size
1824	IFAbbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 32)); // Modification time
1825	IFAbbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Overridden
1826	IFAbbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Transient
1827	IFAbbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Top-level
1828	IFAbbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Module map
1829	IFAbbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 16)); // Name as req. len
1830	IFAbbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Name as req. + name
1831	unsigned IFAbbrevCode = Stream.EmitAbbrev(Abbv: std::move(IFAbbrev));
1832
1833	// Create input file hash abbreviation.
1834	auto IFHAbbrev = std::make_shared<BitCodeAbbrev>();
1835	IFHAbbrev->Add(OpInfo: BitCodeAbbrevOp(INPUT_FILE_HASH));
1836	IFHAbbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
1837	IFHAbbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
1838	unsigned IFHAbbrevCode = Stream.EmitAbbrev(Abbv: std::move(IFHAbbrev));
1839
1840	uint64_t InputFilesOffsetBase = Stream.GetCurrentBitNo();
1841
1842	// Get all ContentCache objects for files.
1843	std::vector<InputFileEntry> UserFiles;
1844	std::vector<InputFileEntry> SystemFiles;
1845	for (unsigned I = 1, N = SourceMgr.local_sloc_entry_size(); I != N; ++I) {
1846	// Get this source location entry.
1847	const SrcMgr::SLocEntry *SLoc = &SourceMgr.getLocalSLocEntry(Index: I);
1848	assert(&SourceMgr.getSLocEntry(FileID::get(I)) == SLoc);
1849
1850	// We only care about file entries that were not overridden.
1851	if (!SLoc->isFile())
1852	continue;
1853	const SrcMgr::FileInfo &File = SLoc->getFile();
1854	const SrcMgr::ContentCache *Cache = &File.getContentCache();
1855	if (!Cache->OrigEntry)
1856	continue;
1857
1858	// Do not emit input files that do not affect current module.
1859	if (!IsSLocFileEntryAffecting[I])
1860	continue;
1861
1862	InputFileEntry Entry(*Cache->OrigEntry);
1863	Entry.IsSystemFile = isSystem(CK: File.getFileCharacteristic());
1864	Entry.IsTransient = Cache->IsTransient;
1865	Entry.BufferOverridden = Cache->BufferOverridden;
1866
1867	FileID IncludeFileID = SourceMgr.getFileID(SpellingLoc: File.getIncludeLoc());
1868	Entry.IsTopLevel = IncludeFileID.isInvalid() || IncludeFileID.ID < 0 ||
1869	!IsSLocFileEntryAffecting[IncludeFileID.ID];
1870	Entry.IsModuleMap = isModuleMap(CK: File.getFileCharacteristic());
1871
1872	Entry.trySetContentHash(PP&: *PP, GetMemBuff: [&] { return Cache->getBufferIfLoaded(); });
1873
1874	if (Entry.IsSystemFile)
1875	SystemFiles.push_back(x: Entry);
1876	else
1877	UserFiles.push_back(x: Entry);
1878	}
1879
1880	// FIXME: Make providing input files not in the SourceManager more flexible.
1881	// The SDKSettings.json file is necessary for correct evaluation of
1882	// availability annotations.
1883	StringRef Sysroot = PP->getHeaderSearchInfo().getHeaderSearchOpts().Sysroot;
1884	if (!Sysroot.empty()) {
1885	SmallString<128> SDKSettingsJSON = Sysroot;
1886	llvm::sys::path::append(path&: SDKSettingsJSON, a: "SDKSettings.json");
1887	FileManager &FM = PP->getFileManager();
1888	if (auto FE = FM.getOptionalFileRef(Filename: SDKSettingsJSON)) {
1889	InputFileEntry Entry(*FE);
1890	Entry.IsSystemFile = true;
1891	Entry.IsTransient = false;
1892	Entry.BufferOverridden = false;
1893	Entry.IsTopLevel = true;
1894	Entry.IsModuleMap = false;
1895	std::unique_ptr<MemoryBuffer> MB;
1896	Entry.trySetContentHash(PP&: *PP, GetMemBuff: [&]() -> std::optional<MemoryBufferRef> {
1897	if (auto MBOrErr = FM.getBufferForFile(Entry: Entry.File)) {
1898	MB = std::move(*MBOrErr);
1899	return MB->getMemBufferRef();
1900	}
1901	return std::nullopt;
1902	});
1903	SystemFiles.push_back(x: Entry);
1904	}
1905	}
1906
1907	// User files go at the front, system files at the back.
1908	auto SortedFiles = llvm::concat<InputFileEntry>(Ranges: std::move(UserFiles),
1909	Ranges: std::move(SystemFiles));
1910
1911	unsigned UserFilesNum = 0;
1912	// Write out all of the input files.
1913	std::vector<uint64_t> InputFileOffsets;
1914	for (const auto &Entry : SortedFiles) {
1915	uint32_t &InputFileID = InputFileIDs[Entry.File];
1916	if (InputFileID != 0)
1917	continue; // already recorded this file.
1918
1919	// Record this entry's offset.
1920	InputFileOffsets.push_back(x: Stream.GetCurrentBitNo() - InputFilesOffsetBase);
1921
1922	InputFileID = InputFileOffsets.size();
1923
1924	if (!Entry.IsSystemFile)
1925	++UserFilesNum;
1926
1927	// Emit size/modification time for this file.
1928	// And whether this file was overridden.
1929	{
1930	SmallString<128> NameAsRequested = Entry.File.getNameAsRequested();
1931	SmallString<128> Name = Entry.File.getName();
1932
1933	PreparePathForOutput(Path&: NameAsRequested);
1934	PreparePathForOutput(Path&: Name);
1935
1936	if (Name == NameAsRequested)
1937	Name.clear();
1938
1939	RecordData::value_type Record[] = {
1940	INPUT_FILE,
1941	InputFileOffsets.size(),
1942	(uint64_t)Entry.File.getSize(),
1943	(uint64_t)getTimestampForOutput(E: Entry.File),
1944	Entry.BufferOverridden,
1945	Entry.IsTransient,
1946	Entry.IsTopLevel,
1947	Entry.IsModuleMap,
1948	NameAsRequested.size()};
1949
1950	Stream.EmitRecordWithBlob(Abbrev: IFAbbrevCode, Vals: Record,
1951	Blob: (NameAsRequested + Name).str());
1952	}
1953
1954	// Emit content hash for this file.
1955	{
1956	RecordData::value_type Record[] = {INPUT_FILE_HASH, Entry.ContentHash[0],
1957	Entry.ContentHash[1]};
1958	Stream.EmitRecordWithAbbrev(Abbrev: IFHAbbrevCode, Vals: Record);
1959	}
1960	}
1961
1962	Stream.ExitBlock();
1963
1964	// Create input file offsets abbreviation.
1965	auto OffsetsAbbrev = std::make_shared<BitCodeAbbrev>();
1966	OffsetsAbbrev->Add(OpInfo: BitCodeAbbrevOp(INPUT_FILE_OFFSETS));
1967	OffsetsAbbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // # input files
1968	OffsetsAbbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // # non-system
1969	// input files
1970	OffsetsAbbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Array
1971	unsigned OffsetsAbbrevCode = Stream.EmitAbbrev(Abbv: std::move(OffsetsAbbrev));
1972
1973	// Write input file offsets.
1974	RecordData::value_type Record[] = {INPUT_FILE_OFFSETS,
1975	InputFileOffsets.size(), UserFilesNum};
1976	Stream.EmitRecordWithBlob(Abbrev: OffsetsAbbrevCode, Vals: Record, Blob: bytes(v: InputFileOffsets));
1977	}
1978
1979	//===----------------------------------------------------------------------===//
1980	// Source Manager Serialization
1981	//===----------------------------------------------------------------------===//
1982
1983	/// Create an abbreviation for the SLocEntry that refers to a
1984	/// file.
1985	static unsigned CreateSLocFileAbbrev(llvm::BitstreamWriter &Stream) {
1986	using namespace llvm;
1987
1988	auto Abbrev = std::make_shared<BitCodeAbbrev>();
1989	Abbrev->Add(OpInfo: BitCodeAbbrevOp(SM_SLOC_FILE_ENTRY));
1990	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // Offset
1991	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // Include location
1992	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // Characteristic
1993	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Line directives
1994	// FileEntry fields.
1995	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Input File ID
1996	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // NumCreatedFIDs
1997	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 24)); // FirstDeclIndex
1998	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // NumDecls
1999	return Stream.EmitAbbrev(Abbv: std::move(Abbrev));
2000	}
2001
2002	/// Create an abbreviation for the SLocEntry that refers to a
2003	/// buffer.
2004	static unsigned CreateSLocBufferAbbrev(llvm::BitstreamWriter &Stream) {
2005	using namespace llvm;
2006
2007	auto Abbrev = std::make_shared<BitCodeAbbrev>();
2008	Abbrev->Add(OpInfo: BitCodeAbbrevOp(SM_SLOC_BUFFER_ENTRY));
2009	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // Offset
2010	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // Include location
2011	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // Characteristic
2012	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Line directives
2013	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Buffer name blob
2014	return Stream.EmitAbbrev(Abbv: std::move(Abbrev));
2015	}
2016
2017	/// Create an abbreviation for the SLocEntry that refers to a
2018	/// buffer's blob.
2019	static unsigned CreateSLocBufferBlobAbbrev(llvm::BitstreamWriter &Stream,
2020	bool Compressed) {
2021	using namespace llvm;
2022
2023	auto Abbrev = std::make_shared<BitCodeAbbrev>();
2024	Abbrev->Add(OpInfo: BitCodeAbbrevOp(Compressed ? SM_SLOC_BUFFER_BLOB_COMPRESSED
2025	: SM_SLOC_BUFFER_BLOB));
2026	if (Compressed)
2027	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // Uncompressed size
2028	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Blob
2029	return Stream.EmitAbbrev(Abbv: std::move(Abbrev));
2030	}
2031
2032	/// Create an abbreviation for the SLocEntry that refers to a macro
2033	/// expansion.
2034	static unsigned CreateSLocExpansionAbbrev(llvm::BitstreamWriter &Stream) {
2035	using namespace llvm;
2036
2037	auto Abbrev = std::make_shared<BitCodeAbbrev>();
2038	Abbrev->Add(OpInfo: BitCodeAbbrevOp(SM_SLOC_EXPANSION_ENTRY));
2039	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // Offset
2040	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // Spelling location
2041	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Start location
2042	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // End location
2043	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Is token range
2044	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Token length
2045	return Stream.EmitAbbrev(Abbv: std::move(Abbrev));
2046	}
2047
2048	/// Emit key length and data length as ULEB-encoded data, and return them as a
2049	/// pair.
2050	static std::pair<unsigned, unsigned>
2051	emitULEBKeyDataLength(unsigned KeyLen, unsigned DataLen, raw_ostream &Out) {
2052	llvm::encodeULEB128(Value: KeyLen, OS&: Out);
2053	llvm::encodeULEB128(Value: DataLen, OS&: Out);
2054	return std::make_pair(x&: KeyLen, y&: DataLen);
2055	}
2056
2057	namespace {
2058
2059	// Trait used for the on-disk hash table of header search information.
2060	class HeaderFileInfoTrait {
2061	ASTWriter &Writer;
2062
2063	public:
2064	HeaderFileInfoTrait(ASTWriter &Writer) : Writer(Writer) {}
2065
2066	struct key_type {
2067	StringRef Filename;
2068	off_t Size;
2069	time_t ModTime;
2070	};
2071	using key_type_ref = const key_type &;
2072
2073	using UnresolvedModule =
2074	llvm::PointerIntPair<Module *, 2, ModuleMap::ModuleHeaderRole>;
2075
2076	struct data_type {
2077	data_type(const HeaderFileInfo &HFI, bool AlreadyIncluded,
2078	ArrayRef<ModuleMap::KnownHeader> KnownHeaders,
2079	UnresolvedModule Unresolved)
2080	: HFI(HFI), AlreadyIncluded(AlreadyIncluded),
2081	KnownHeaders(KnownHeaders), Unresolved(Unresolved) {}
2082
2083	HeaderFileInfo HFI;
2084	bool AlreadyIncluded;
2085	SmallVector<ModuleMap::KnownHeader, 1> KnownHeaders;
2086	UnresolvedModule Unresolved;
2087	};
2088	using data_type_ref = const data_type &;
2089
2090	using hash_value_type = unsigned;
2091	using offset_type = unsigned;
2092
2093	hash_value_type ComputeHash(key_type_ref key) {
2094	// The hash is based only on size/time of the file, so that the reader can
2095	// match even when symlinking or excess path elements ("foo/../", "../")
2096	// change the form of the name. However, complete path is still the key.
2097	uint8_t buf[sizeof(key.Size) + sizeof(key.ModTime)];
2098	memcpy(dest: buf, src: &key.Size, n: sizeof(key.Size));
2099	memcpy(dest: buf + sizeof(key.Size), src: &key.ModTime, n: sizeof(key.ModTime));
2100	return llvm::xxh3_64bits(data: buf);
2101	}
2102
2103	std::pair<unsigned, unsigned>
2104	EmitKeyDataLength(raw_ostream& Out, key_type_ref key, data_type_ref Data) {
2105	unsigned KeyLen = key.Filename.size() + 1 + 8 + 8;
2106	unsigned DataLen = 1 + sizeof(IdentifierID);
2107	for (auto ModInfo : Data.KnownHeaders)
2108	if (Writer.getLocalOrImportedSubmoduleID(Mod: ModInfo.getModule()))
2109	DataLen += 4;
2110	if (Data.Unresolved.getPointer())
2111	DataLen += 4;
2112	return emitULEBKeyDataLength(KeyLen, DataLen, Out);
2113	}
2114
2115	void EmitKey(raw_ostream& Out, key_type_ref key, unsigned KeyLen) {
2116	using namespace llvm::support;
2117
2118	endian::Writer LE(Out, llvm::endianness::little);
2119	LE.write<uint64_t>(Val: key.Size);
2120	KeyLen -= 8;
2121	LE.write<uint64_t>(Val: key.ModTime);
2122	KeyLen -= 8;
2123	Out.write(Ptr: key.Filename.data(), Size: KeyLen);
2124	}
2125
2126	void EmitData(raw_ostream &Out, key_type_ref key,
2127	data_type_ref Data, unsigned DataLen) {
2128	using namespace llvm::support;
2129
2130	endian::Writer LE(Out, llvm::endianness::little);
2131	uint64_t Start = Out.tell(); (void)Start;
2132
2133	unsigned char Flags = (Data.AlreadyIncluded << 6)
2134	| (Data.HFI.isImport << 5)
2135	| (Writer.isWritingStdCXXNamedModules() ? 0 :
2136	Data.HFI.isPragmaOnce << 4)
2137	| (Data.HFI.DirInfo << 1);
2138	LE.write<uint8_t>(Val: Flags);
2139
2140	if (Data.HFI.LazyControllingMacro.isID())
2141	LE.write<IdentifierID>(Val: Data.HFI.LazyControllingMacro.getID());
2142	else
2143	LE.write<IdentifierID>(
2144	Val: Writer.getIdentifierRef(II: Data.HFI.LazyControllingMacro.getPtr()));
2145
2146	auto EmitModule = [&](Module *M, ModuleMap::ModuleHeaderRole Role) {
2147	if (uint32_t ModID = Writer.getLocalOrImportedSubmoduleID(Mod: M)) {
2148	uint32_t Value = (ModID << 3) | (unsigned)Role;
2149	assert((Value >> 3) == ModID && "overflow in header module info");
2150	LE.write<uint32_t>(Val: Value);
2151	}
2152	};
2153
2154	for (auto ModInfo : Data.KnownHeaders)
2155	EmitModule(ModInfo.getModule(), ModInfo.getRole());
2156	if (Data.Unresolved.getPointer())
2157	EmitModule(Data.Unresolved.getPointer(), Data.Unresolved.getInt());
2158
2159	assert(Out.tell() - Start == DataLen && "Wrong data length");
2160	}
2161	};
2162
2163	} // namespace
2164
2165	/// Write the header search block for the list of files that
2166	///
2167	/// \param HS The header search structure to save.
2168	void ASTWriter::WriteHeaderSearch(const HeaderSearch &HS) {
2169	HeaderFileInfoTrait GeneratorTrait(*this);
2170	llvm::OnDiskChainedHashTableGenerator<HeaderFileInfoTrait> Generator;
2171	SmallVector<const char *, 4> SavedStrings;
2172	unsigned NumHeaderSearchEntries = 0;
2173
2174	// Find all unresolved headers for the current module. We generally will
2175	// have resolved them before we get here, but not necessarily: we might be
2176	// compiling a preprocessed module, where there is no requirement for the
2177	// original files to exist any more.
2178	const HeaderFileInfo Empty; // So we can take a reference.
2179	if (WritingModule) {
2180	llvm::SmallVector<Module *, 16> Worklist(1, WritingModule);
2181	while (!Worklist.empty()) {
2182	Module *M = Worklist.pop_back_val();
2183	// We don't care about headers in unimportable submodules.
2184	if (M->isUnimportable())
2185	continue;
2186
2187	// Map to disk files where possible, to pick up any missing stat
2188	// information. This also means we don't need to check the unresolved
2189	// headers list when emitting resolved headers in the first loop below.
2190	// FIXME: It'd be preferable to avoid doing this if we were given
2191	// sufficient stat information in the module map.
2192	HS.getModuleMap().resolveHeaderDirectives(Mod: M, /*File=*/std::nullopt);
2193
2194	// If the file didn't exist, we can still create a module if we were given
2195	// enough information in the module map.
2196	for (const auto &U : M->MissingHeaders) {
2197	// Check that we were given enough information to build a module
2198	// without this file existing on disk.
2199	if (!U.Size || (!U.ModTime && IncludeTimestamps)) {
2200	PP->Diag(U.FileNameLoc, diag::err_module_no_size_mtime_for_header)
2201	<< WritingModule->getFullModuleName() << U.Size.has_value()
2202	<< U.FileName;
2203	continue;
2204	}
2205
2206	// Form the effective relative pathname for the file.
2207	SmallString<128> Filename(M->Directory->getName());
2208	llvm::sys::path::append(path&: Filename, a: U.FileName);
2209	PreparePathForOutput(Path&: Filename);
2210
2211	StringRef FilenameDup = strdup(s: Filename.c_str());
2212	SavedStrings.push_back(Elt: FilenameDup.data());
2213
2214	HeaderFileInfoTrait::key_type Key = {
2215	.Filename: FilenameDup, .Size: *U.Size, .ModTime: IncludeTimestamps ? *U.ModTime : 0};
2216	HeaderFileInfoTrait::data_type Data = {
2217	Empty, false, {}, {M, ModuleMap::headerKindToRole(Kind: U.Kind)}};
2218	// FIXME: Deal with cases where there are multiple unresolved header
2219	// directives in different submodules for the same header.
2220	Generator.insert(Key, Data, InfoObj&: GeneratorTrait);
2221	++NumHeaderSearchEntries;
2222	}
2223	auto SubmodulesRange = M->submodules();
2224	Worklist.append(in_start: SubmodulesRange.begin(), in_end: SubmodulesRange.end());
2225	}
2226	}
2227
2228	SmallVector<OptionalFileEntryRef, 16> FilesByUID;
2229	HS.getFileMgr().GetUniqueIDMapping(UIDToFiles&: FilesByUID);
2230
2231	if (FilesByUID.size() > HS.header_file_size())
2232	FilesByUID.resize(N: HS.header_file_size());
2233
2234	for (unsigned UID = 0, LastUID = FilesByUID.size(); UID != LastUID; ++UID) {
2235	OptionalFileEntryRef File = FilesByUID[UID];
2236	if (!File)
2237	continue;
2238
2239	const HeaderFileInfo *HFI = HS.getExistingLocalFileInfo(FE: *File);
2240	if (!HFI)
2241	continue; // We have no information on this being a header file.
2242	if (!HFI->isCompilingModuleHeader && HFI->isModuleHeader)
2243	continue; // Header file info is tracked by the owning module file.
2244	if (!HFI->isCompilingModuleHeader && !HFI->IsLocallyIncluded)
2245	continue; // Header file info is tracked by the including module file.
2246
2247	// Massage the file path into an appropriate form.
2248	StringRef Filename = File->getName();
2249	SmallString<128> FilenameTmp(Filename);
2250	if (PreparePathForOutput(Path&: FilenameTmp)) {
2251	// If we performed any translation on the file name at all, we need to
2252	// save this string, since the generator will refer to it later.
2253	Filename = StringRef(strdup(s: FilenameTmp.c_str()));
2254	SavedStrings.push_back(Elt: Filename.data());
2255	}
2256
2257	bool Included = HFI->IsLocallyIncluded || PP->alreadyIncluded(File: *File);
2258
2259	HeaderFileInfoTrait::key_type Key = {
2260	.Filename: Filename, .Size: File->getSize(), .ModTime: getTimestampForOutput(E: *File)
2261	};
2262	HeaderFileInfoTrait::data_type Data = {
2263	*HFI, Included, HS.getModuleMap().findResolvedModulesForHeader(File: *File), {}
2264	};
2265	Generator.insert(Key, Data, InfoObj&: GeneratorTrait);
2266	++NumHeaderSearchEntries;
2267	}
2268
2269	// Create the on-disk hash table in a buffer.
2270	SmallString<4096> TableData;
2271	uint32_t BucketOffset;
2272	{
2273	using namespace llvm::support;
2274
2275	llvm::raw_svector_ostream Out(TableData);
2276	// Make sure that no bucket is at offset 0
2277	endian::write<uint32_t>(os&: Out, value: 0, endian: llvm::endianness::little);
2278	BucketOffset = Generator.Emit(Out, InfoObj&: GeneratorTrait);
2279	}
2280
2281	// Create a blob abbreviation
2282	using namespace llvm;
2283
2284	auto Abbrev = std::make_shared<BitCodeAbbrev>();
2285	Abbrev->Add(OpInfo: BitCodeAbbrevOp(HEADER_SEARCH_TABLE));
2286	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
2287	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
2288	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
2289	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
2290	unsigned TableAbbrev = Stream.EmitAbbrev(Abbv: std::move(Abbrev));
2291
2292	// Write the header search table
2293	RecordData::value_type Record[] = {HEADER_SEARCH_TABLE, BucketOffset,
2294	NumHeaderSearchEntries, TableData.size()};
2295	Stream.EmitRecordWithBlob(Abbrev: TableAbbrev, Vals: Record, Blob: TableData);
2296
2297	// Free all of the strings we had to duplicate.
2298	for (unsigned I = 0, N = SavedStrings.size(); I != N; ++I)
2299	free(ptr: const_cast<char *>(SavedStrings[I]));
2300	}
2301
2302	static void emitBlob(llvm::BitstreamWriter &Stream, StringRef Blob,
2303	unsigned SLocBufferBlobCompressedAbbrv,
2304	unsigned SLocBufferBlobAbbrv) {
2305	using RecordDataType = ASTWriter::RecordData::value_type;
2306
2307	// Compress the buffer if possible. We expect that almost all PCM
2308	// consumers will not want its contents.
2309	SmallVector<uint8_t, 0> CompressedBuffer;
2310	if (llvm::compression::zstd::isAvailable()) {
2311	llvm::compression::zstd::compress(
2312	Input: llvm::arrayRefFromStringRef(Input: Blob.drop_back(N: 1)), CompressedBuffer, Level: 9);
2313	RecordDataType Record[] = {SM_SLOC_BUFFER_BLOB_COMPRESSED, Blob.size() - 1};
2314	Stream.EmitRecordWithBlob(Abbrev: SLocBufferBlobCompressedAbbrv, Vals: Record,
2315	Blob: llvm::toStringRef(Input: CompressedBuffer));
2316	return;
2317	}
2318	if (llvm::compression::zlib::isAvailable()) {
2319	llvm::compression::zlib::compress(
2320	Input: llvm::arrayRefFromStringRef(Input: Blob.drop_back(N: 1)), CompressedBuffer);
2321	RecordDataType Record[] = {SM_SLOC_BUFFER_BLOB_COMPRESSED, Blob.size() - 1};
2322	Stream.EmitRecordWithBlob(Abbrev: SLocBufferBlobCompressedAbbrv, Vals: Record,
2323	Blob: llvm::toStringRef(Input: CompressedBuffer));
2324	return;
2325	}
2326
2327	RecordDataType Record[] = {SM_SLOC_BUFFER_BLOB};
2328	Stream.EmitRecordWithBlob(Abbrev: SLocBufferBlobAbbrv, Vals: Record, Blob);
2329	}
2330
2331	/// Writes the block containing the serialized form of the
2332	/// source manager.
2333	///
2334	/// TODO: We should probably use an on-disk hash table (stored in a
2335	/// blob), indexed based on the file name, so that we only create
2336	/// entries for files that we actually need. In the common case (no
2337	/// errors), we probably won't have to create file entries for any of
2338	/// the files in the AST.
2339	void ASTWriter::WriteSourceManagerBlock(SourceManager &SourceMgr) {
2340	RecordData Record;
2341
2342	// Enter the source manager block.
2343	Stream.EnterSubblock(BlockID: SOURCE_MANAGER_BLOCK_ID, CodeLen: 4);
2344	const uint64_t SourceManagerBlockOffset = Stream.GetCurrentBitNo();
2345
2346	// Abbreviations for the various kinds of source-location entries.
2347	unsigned SLocFileAbbrv = CreateSLocFileAbbrev(Stream);
2348	unsigned SLocBufferAbbrv = CreateSLocBufferAbbrev(Stream);
2349	unsigned SLocBufferBlobAbbrv = CreateSLocBufferBlobAbbrev(Stream, Compressed: false);
2350	unsigned SLocBufferBlobCompressedAbbrv =
2351	CreateSLocBufferBlobAbbrev(Stream, Compressed: true);
2352	unsigned SLocExpansionAbbrv = CreateSLocExpansionAbbrev(Stream);
2353
2354	// Write out the source location entry table. We skip the first
2355	// entry, which is always the same dummy entry.
2356	std::vector<uint32_t> SLocEntryOffsets;
2357	uint64_t SLocEntryOffsetsBase = Stream.GetCurrentBitNo();
2358	SLocEntryOffsets.reserve(n: SourceMgr.local_sloc_entry_size() - 1);
2359	for (unsigned I = 1, N = SourceMgr.local_sloc_entry_size();
2360	I != N; ++I) {
2361	// Get this source location entry.
2362	const SrcMgr::SLocEntry *SLoc = &SourceMgr.getLocalSLocEntry(Index: I);
2363	FileID FID = FileID::get(V: I);
2364	assert(&SourceMgr.getSLocEntry(FID) == SLoc);
2365
2366	// Record the offset of this source-location entry.
2367	uint64_t Offset = Stream.GetCurrentBitNo() - SLocEntryOffsetsBase;
2368	assert((Offset >> 32) == 0 && "SLocEntry offset too large");
2369
2370	// Figure out which record code to use.
2371	unsigned Code;
2372	if (SLoc->isFile()) {
2373	const SrcMgr::ContentCache *Cache = &SLoc->getFile().getContentCache();
2374	if (Cache->OrigEntry) {
2375	Code = SM_SLOC_FILE_ENTRY;
2376	} else
2377	Code = SM_SLOC_BUFFER_ENTRY;
2378	} else
2379	Code = SM_SLOC_EXPANSION_ENTRY;
2380	Record.clear();
2381	Record.push_back(Elt: Code);
2382
2383	if (SLoc->isFile()) {
2384	const SrcMgr::FileInfo &File = SLoc->getFile();
2385	const SrcMgr::ContentCache *Content = &File.getContentCache();
2386	// Do not emit files that were not listed as inputs.
2387	if (!IsSLocAffecting[I])
2388	continue;
2389	SLocEntryOffsets.push_back(x: Offset);
2390	// Starting offset of this entry within this module, so skip the dummy.
2391	Record.push_back(Elt: getAdjustedOffset(Offset: SLoc->getOffset()) - 2);
2392	AddSourceLocation(Loc: getAffectingIncludeLoc(SourceMgr, File), Record);
2393	Record.push_back(Elt: File.getFileCharacteristic()); // FIXME: stable encoding
2394	Record.push_back(Elt: File.hasLineDirectives());
2395
2396	bool EmitBlob = false;
2397	if (Content->OrigEntry) {
2398	assert(Content->OrigEntry == Content->ContentsEntry &&
2399	"Writing to AST an overridden file is not supported");
2400
2401	// The source location entry is a file. Emit input file ID.
2402	assert(InputFileIDs[*Content->OrigEntry] != 0 && "Missed file entry");
2403	Record.push_back(Elt: InputFileIDs[*Content->OrigEntry]);
2404
2405	Record.push_back(Elt: getAdjustedNumCreatedFIDs(FID));
2406
2407	FileDeclIDsTy::iterator FDI = FileDeclIDs.find(Val: FID);
2408	if (FDI != FileDeclIDs.end()) {
2409	Record.push_back(Elt: FDI->second->FirstDeclIndex);
2410	Record.push_back(Elt: FDI->second->DeclIDs.size());
2411	} else {
2412	Record.push_back(Elt: 0);
2413	Record.push_back(Elt: 0);
2414	}
2415
2416	Stream.EmitRecordWithAbbrev(Abbrev: SLocFileAbbrv, Vals: Record);
2417
2418	if (Content->BufferOverridden || Content->IsTransient)
2419	EmitBlob = true;
2420	} else {
2421	// The source location entry is a buffer. The blob associated
2422	// with this entry contains the contents of the buffer.
2423
2424	// We add one to the size so that we capture the trailing NULL
2425	// that is required by llvm::MemoryBuffer::getMemBuffer (on
2426	// the reader side).
2427	std::optional<llvm::MemoryBufferRef> Buffer = Content->getBufferOrNone(
2428	Diag&: SourceMgr.getDiagnostics(), FM&: SourceMgr.getFileManager());
2429	StringRef Name = Buffer ? Buffer->getBufferIdentifier() : "";
2430	Stream.EmitRecordWithBlob(Abbrev: SLocBufferAbbrv, Vals: Record,
2431	Blob: StringRef(Name.data(), Name.size() + 1));
2432	EmitBlob = true;
2433	}
2434
2435	if (EmitBlob) {
2436	// Include the implicit terminating null character in the on-disk buffer
2437	// if we're writing it uncompressed.
2438	std::optional<llvm::MemoryBufferRef> Buffer = Content->getBufferOrNone(
2439	Diag&: SourceMgr.getDiagnostics(), FM&: SourceMgr.getFileManager());
2440	if (!Buffer)
2441	Buffer = llvm::MemoryBufferRef("<<<INVALID BUFFER>>>", "");
2442	StringRef Blob(Buffer->getBufferStart(), Buffer->getBufferSize() + 1);
2443	emitBlob(Stream, Blob, SLocBufferBlobCompressedAbbrv,
2444	SLocBufferBlobAbbrv);
2445	}
2446	} else {
2447	// The source location entry is a macro expansion.
2448	const SrcMgr::ExpansionInfo &Expansion = SLoc->getExpansion();
2449	SLocEntryOffsets.push_back(x: Offset);
2450	// Starting offset of this entry within this module, so skip the dummy.
2451	Record.push_back(Elt: getAdjustedOffset(Offset: SLoc->getOffset()) - 2);
2452	LocSeq::State Seq;
2453	AddSourceLocation(Loc: Expansion.getSpellingLoc(), Record, Seq);
2454	AddSourceLocation(Loc: Expansion.getExpansionLocStart(), Record, Seq);
2455	AddSourceLocation(Loc: Expansion.isMacroArgExpansion()
2456	? SourceLocation()
2457	: Expansion.getExpansionLocEnd(),
2458	Record, Seq);
2459	Record.push_back(Elt: Expansion.isExpansionTokenRange());
2460
2461	// Compute the token length for this macro expansion.
2462	SourceLocation::UIntTy NextOffset = SourceMgr.getNextLocalOffset();
2463	if (I + 1 != N)
2464	NextOffset = SourceMgr.getLocalSLocEntry(Index: I + 1).getOffset();
2465	Record.push_back(Elt: getAdjustedOffset(Offset: NextOffset - SLoc->getOffset()) - 1);
2466	Stream.EmitRecordWithAbbrev(Abbrev: SLocExpansionAbbrv, Vals: Record);
2467	}
2468	}
2469
2470	Stream.ExitBlock();
2471
2472	if (SLocEntryOffsets.empty())
2473	return;
2474
2475	// Write the source-location offsets table into the AST block. This
2476	// table is used for lazily loading source-location information.
2477	using namespace llvm;
2478
2479	auto Abbrev = std::make_shared<BitCodeAbbrev>();
2480	Abbrev->Add(OpInfo: BitCodeAbbrevOp(SOURCE_LOCATION_OFFSETS));
2481	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 16)); // # of slocs
2482	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 16)); // total size
2483	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 32)); // base offset
2484	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // offsets
2485	unsigned SLocOffsetsAbbrev = Stream.EmitAbbrev(Abbv: std::move(Abbrev));
2486	{
2487	RecordData::value_type Record[] = {
2488	SOURCE_LOCATION_OFFSETS, SLocEntryOffsets.size(),
2489	getAdjustedOffset(Offset: SourceMgr.getNextLocalOffset()) - 1 /* skip dummy */,
2490	SLocEntryOffsetsBase - SourceManagerBlockOffset};
2491	Stream.EmitRecordWithBlob(Abbrev: SLocOffsetsAbbrev, Vals: Record,
2492	Blob: bytes(v: SLocEntryOffsets));
2493	}
2494
2495	// Write the line table. It depends on remapping working, so it must come
2496	// after the source location offsets.
2497	if (SourceMgr.hasLineTable()) {
2498	LineTableInfo &LineTable = SourceMgr.getLineTable();
2499
2500	Record.clear();
2501
2502	// Emit the needed file names.
2503	llvm::DenseMap<int, int> FilenameMap;
2504	FilenameMap[-1] = -1; // For unspecified filenames.
2505	for (const auto &L : LineTable) {
2506	if (L.first.ID < 0)
2507	continue;
2508	for (auto &LE : L.second) {
2509	if (FilenameMap.insert(KV: std::make_pair(x: LE.FilenameID,
2510	y: FilenameMap.size() - 1)).second)
2511	AddPath(Path: LineTable.getFilename(ID: LE.FilenameID), Record);
2512	}
2513	}
2514	Record.push_back(Elt: 0);
2515
2516	// Emit the line entries
2517	for (const auto &L : LineTable) {
2518	// Only emit entries for local files.
2519	if (L.first.ID < 0)
2520	continue;
2521
2522	AddFileID(FID: L.first, Record);
2523
2524	// Emit the line entries
2525	Record.push_back(Elt: L.second.size());
2526	for (const auto &LE : L.second) {
2527	Record.push_back(Elt: LE.FileOffset);
2528	Record.push_back(Elt: LE.LineNo);
2529	Record.push_back(Elt: FilenameMap[LE.FilenameID]);
2530	Record.push_back(Elt: (unsigned)LE.FileKind);
2531	Record.push_back(Elt: LE.IncludeOffset);
2532	}
2533	}
2534
2535	Stream.EmitRecord(Code: SOURCE_MANAGER_LINE_TABLE, Vals: Record);
2536	}
2537	}
2538
2539	//===----------------------------------------------------------------------===//
2540	// Preprocessor Serialization
2541	//===----------------------------------------------------------------------===//
2542
2543	static bool shouldIgnoreMacro(MacroDirective *MD, bool IsModule,
2544	const Preprocessor &PP) {
2545	if (MacroInfo *MI = MD->getMacroInfo())
2546	if (MI->isBuiltinMacro())
2547	return true;
2548
2549	if (IsModule) {
2550	SourceLocation Loc = MD->getLocation();
2551	if (Loc.isInvalid())
2552	return true;
2553	if (PP.getSourceManager().getFileID(SpellingLoc: Loc) == PP.getPredefinesFileID())
2554	return true;
2555	}
2556
2557	return false;
2558	}
2559
2560	/// Writes the block containing the serialized form of the
2561	/// preprocessor.
2562	void ASTWriter::WritePreprocessor(const Preprocessor &PP, bool IsModule) {
2563	uint64_t MacroOffsetsBase = Stream.GetCurrentBitNo();
2564
2565	PreprocessingRecord *PPRec = PP.getPreprocessingRecord();
2566	if (PPRec)
2567	WritePreprocessorDetail(PPRec&: *PPRec, MacroOffsetsBase);
2568
2569	RecordData Record;
2570	RecordData ModuleMacroRecord;
2571
2572	// If the preprocessor __COUNTER__ value has been bumped, remember it.
2573	if (PP.getCounterValue() != 0) {
2574	RecordData::value_type Record[] = {PP.getCounterValue()};
2575	Stream.EmitRecord(Code: PP_COUNTER_VALUE, Vals: Record);
2576	}
2577
2578	// If we have a recorded #pragma assume_nonnull, remember it so it can be
2579	// replayed when the preamble terminates into the main file.
2580	SourceLocation AssumeNonNullLoc =
2581	PP.getPreambleRecordedPragmaAssumeNonNullLoc();
2582	if (AssumeNonNullLoc.isValid()) {
2583	assert(PP.isRecordingPreamble());
2584	AddSourceLocation(Loc: AssumeNonNullLoc, Record);
2585	Stream.EmitRecord(Code: PP_ASSUME_NONNULL_LOC, Vals: Record);
2586	Record.clear();
2587	}
2588
2589	if (PP.isRecordingPreamble() && PP.hasRecordedPreamble()) {
2590	assert(!IsModule);
2591	auto SkipInfo = PP.getPreambleSkipInfo();
2592	if (SkipInfo) {
2593	Record.push_back(Elt: true);
2594	AddSourceLocation(Loc: SkipInfo->HashTokenLoc, Record);
2595	AddSourceLocation(Loc: SkipInfo->IfTokenLoc, Record);
2596	Record.push_back(Elt: SkipInfo->FoundNonSkipPortion);
2597	Record.push_back(Elt: SkipInfo->FoundElse);
2598	AddSourceLocation(Loc: SkipInfo->ElseLoc, Record);
2599	} else {
2600	Record.push_back(Elt: false);
2601	}
2602	for (const auto &Cond : PP.getPreambleConditionalStack()) {
2603	AddSourceLocation(Loc: Cond.IfLoc, Record);
2604	Record.push_back(Elt: Cond.WasSkipping);
2605	Record.push_back(Elt: Cond.FoundNonSkip);
2606	Record.push_back(Elt: Cond.FoundElse);
2607	}
2608	Stream.EmitRecord(Code: PP_CONDITIONAL_STACK, Vals: Record);
2609	Record.clear();
2610	}
2611
2612	// Write the safe buffer opt-out region map in PP
2613	for (SourceLocation &S : PP.serializeSafeBufferOptOutMap())
2614	AddSourceLocation(Loc: S, Record);
2615	Stream.EmitRecord(Code: PP_UNSAFE_BUFFER_USAGE, Vals: Record);
2616	Record.clear();
2617
2618	// Enter the preprocessor block.
2619	Stream.EnterSubblock(BlockID: PREPROCESSOR_BLOCK_ID, CodeLen: 3);
2620
2621	// If the AST file contains __DATE__ or __TIME__ emit a warning about this.
2622	// FIXME: Include a location for the use, and say which one was used.
2623	if (PP.SawDateOrTime())
2624	PP.Diag(SourceLocation(), diag::warn_module_uses_date_time) << IsModule;
2625
2626	// Loop over all the macro directives that are live at the end of the file,
2627	// emitting each to the PP section.
2628
2629	// Construct the list of identifiers with macro directives that need to be
2630	// serialized.
2631	SmallVector<const IdentifierInfo *, 128> MacroIdentifiers;
2632	// It is meaningless to emit macros for named modules. It only wastes times
2633	// and spaces.
2634	if (!isWritingStdCXXNamedModules())
2635	for (auto &Id : PP.getIdentifierTable())
2636	if (Id.second->hadMacroDefinition() &&
2637	(!Id.second->isFromAST() ||
2638	Id.second->hasChangedSinceDeserialization()))
2639	MacroIdentifiers.push_back(Id.second);
2640	// Sort the set of macro definitions that need to be serialized by the
2641	// name of the macro, to provide a stable ordering.
2642	llvm::sort(C&: MacroIdentifiers, Comp: llvm::deref<std::less<>>());
2643
2644	// Emit the macro directives as a list and associate the offset with the
2645	// identifier they belong to.
2646	for (const IdentifierInfo *Name : MacroIdentifiers) {
2647	MacroDirective *MD = PP.getLocalMacroDirectiveHistory(II: Name);
2648	uint64_t StartOffset = Stream.GetCurrentBitNo() - MacroOffsetsBase;
2649	assert((StartOffset >> 32) == 0 && "Macro identifiers offset too large");
2650
2651	// Write out any exported module macros.
2652	bool EmittedModuleMacros = false;
2653	// C+=20 Header Units are compiled module interfaces, but they preserve
2654	// macros that are live (i.e. have a defined value) at the end of the
2655	// compilation. So when writing a header unit, we preserve only the final
2656	// value of each macro (and discard any that are undefined). Header units
2657	// do not have sub-modules (although they might import other header units).
2658	// PCH files, conversely, retain the history of each macro's define/undef
2659	// and of leaf macros in sub modules.
2660	if (IsModule && WritingModule->isHeaderUnit()) {
2661	// This is for the main TU when it is a C++20 header unit.
2662	// We preserve the final state of defined macros, and we do not emit ones
2663	// that are undefined.
2664	if (!MD || shouldIgnoreMacro(MD, IsModule, PP) ||
2665	MD->getKind() == MacroDirective::MD_Undefine)
2666	continue;
2667	AddSourceLocation(Loc: MD->getLocation(), Record);
2668	Record.push_back(Elt: MD->getKind());
2669	if (auto *DefMD = dyn_cast<DefMacroDirective>(Val: MD)) {
2670	Record.push_back(Elt: getMacroRef(MI: DefMD->getInfo(), Name));
2671	} else if (auto *VisMD = dyn_cast<VisibilityMacroDirective>(Val: MD)) {
2672	Record.push_back(Elt: VisMD->isPublic());
2673	}
2674	ModuleMacroRecord.push_back(Elt: getSubmoduleID(Mod: WritingModule));
2675	ModuleMacroRecord.push_back(Elt: getMacroRef(MI: MD->getMacroInfo(), Name));
2676	Stream.EmitRecord(Code: PP_MODULE_MACRO, Vals: ModuleMacroRecord);
2677	ModuleMacroRecord.clear();
2678	EmittedModuleMacros = true;
2679	} else {
2680	// Emit the macro directives in reverse source order.
2681	for (; MD; MD = MD->getPrevious()) {
2682	// Once we hit an ignored macro, we're done: the rest of the chain
2683	// will all be ignored macros.
2684	if (shouldIgnoreMacro(MD, IsModule, PP))
2685	break;
2686	AddSourceLocation(Loc: MD->getLocation(), Record);
2687	Record.push_back(Elt: MD->getKind());
2688	if (auto *DefMD = dyn_cast<DefMacroDirective>(Val: MD)) {
2689	Record.push_back(Elt: getMacroRef(MI: DefMD->getInfo(), Name));
2690	} else if (auto *VisMD = dyn_cast<VisibilityMacroDirective>(Val: MD)) {
2691	Record.push_back(Elt: VisMD->isPublic());
2692	}
2693	}
2694
2695	// We write out exported module macros for PCH as well.
2696	auto Leafs = PP.getLeafModuleMacros(II: Name);
2697	SmallVector<ModuleMacro *, 8> Worklist(Leafs);
2698	llvm::DenseMap<ModuleMacro *, unsigned> Visits;
2699	while (!Worklist.empty()) {
2700	auto *Macro = Worklist.pop_back_val();
2701
2702	// Emit a record indicating this submodule exports this macro.
2703	ModuleMacroRecord.push_back(Elt: getSubmoduleID(Mod: Macro->getOwningModule()));
2704	ModuleMacroRecord.push_back(Elt: getMacroRef(MI: Macro->getMacroInfo(), Name));
2705	for (auto *M : Macro->overrides())
2706	ModuleMacroRecord.push_back(Elt: getSubmoduleID(Mod: M->getOwningModule()));
2707
2708	Stream.EmitRecord(Code: PP_MODULE_MACRO, Vals: ModuleMacroRecord);
2709	ModuleMacroRecord.clear();
2710
2711	// Enqueue overridden macros once we've visited all their ancestors.
2712	for (auto *M : Macro->overrides())
2713	if (++Visits[M] == M->getNumOverridingMacros())
2714	Worklist.push_back(Elt: M);
2715
2716	EmittedModuleMacros = true;
2717	}
2718	}
2719	if (Record.empty() && !EmittedModuleMacros)
2720	continue;
2721
2722	IdentMacroDirectivesOffsetMap[Name] = StartOffset;
2723	Stream.EmitRecord(Code: PP_MACRO_DIRECTIVE_HISTORY, Vals: Record);
2724	Record.clear();
2725	}
2726
2727	/// Offsets of each of the macros into the bitstream, indexed by
2728	/// the local macro ID
2729	///
2730	/// For each identifier that is associated with a macro, this map
2731	/// provides the offset into the bitstream where that macro is
2732	/// defined.
2733	std::vector<uint32_t> MacroOffsets;
2734
2735	for (unsigned I = 0, N = MacroInfosToEmit.size(); I != N; ++I) {
2736	const IdentifierInfo *Name = MacroInfosToEmit[I].Name;
2737	MacroInfo *MI = MacroInfosToEmit[I].MI;
2738	MacroID ID = MacroInfosToEmit[I].ID;
2739
2740	if (ID < FirstMacroID) {
2741	assert(0 && "Loaded MacroInfo entered MacroInfosToEmit ?");
2742	continue;
2743	}
2744
2745	// Record the local offset of this macro.
2746	unsigned Index = ID - FirstMacroID;
2747	if (Index >= MacroOffsets.size())
2748	MacroOffsets.resize(new_size: Index + 1);
2749
2750	uint64_t Offset = Stream.GetCurrentBitNo() - MacroOffsetsBase;
2751	assert((Offset >> 32) == 0 && "Macro offset too large");
2752	MacroOffsets[Index] = Offset;
2753
2754	AddIdentifierRef(II: Name, Record);
2755	AddSourceLocation(Loc: MI->getDefinitionLoc(), Record);
2756	AddSourceLocation(Loc: MI->getDefinitionEndLoc(), Record);
2757	Record.push_back(Elt: MI->isUsed());
2758	Record.push_back(Elt: MI->isUsedForHeaderGuard());
2759	Record.push_back(Elt: MI->getNumTokens());
2760	unsigned Code;
2761	if (MI->isObjectLike()) {
2762	Code = PP_MACRO_OBJECT_LIKE;
2763	} else {
2764	Code = PP_MACRO_FUNCTION_LIKE;
2765
2766	Record.push_back(Elt: MI->isC99Varargs());
2767	Record.push_back(Elt: MI->isGNUVarargs());
2768	Record.push_back(Elt: MI->hasCommaPasting());
2769	Record.push_back(Elt: MI->getNumParams());
2770	for (const IdentifierInfo *Param : MI->params())
2771	AddIdentifierRef(II: Param, Record);
2772	}
2773
2774	// If we have a detailed preprocessing record, record the macro definition
2775	// ID that corresponds to this macro.
2776	if (PPRec)
2777	Record.push_back(Elt: MacroDefinitions[PPRec->findMacroDefinition(MI)]);
2778
2779	Stream.EmitRecord(Code, Vals: Record);
2780	Record.clear();
2781
2782	// Emit the tokens array.
2783	for (unsigned TokNo = 0, e = MI->getNumTokens(); TokNo != e; ++TokNo) {
2784	// Note that we know that the preprocessor does not have any annotation
2785	// tokens in it because they are created by the parser, and thus can't
2786	// be in a macro definition.
2787	const Token &Tok = MI->getReplacementToken(Tok: TokNo);
2788	AddToken(Tok, Record);
2789	Stream.EmitRecord(Code: PP_TOKEN, Vals: Record);
2790	Record.clear();
2791	}
2792	++NumMacros;
2793	}
2794
2795	Stream.ExitBlock();
2796
2797	// Write the offsets table for macro IDs.
2798	using namespace llvm;
2799
2800	auto Abbrev = std::make_shared<BitCodeAbbrev>();
2801	Abbrev->Add(OpInfo: BitCodeAbbrevOp(MACRO_OFFSET));
2802	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // # of macros
2803	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // first ID
2804	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 32)); // base offset
2805	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
2806
2807	unsigned MacroOffsetAbbrev = Stream.EmitAbbrev(Abbv: std::move(Abbrev));
2808	{
2809	RecordData::value_type Record[] = {MACRO_OFFSET, MacroOffsets.size(),
2810	FirstMacroID - NUM_PREDEF_MACRO_IDS,
2811	MacroOffsetsBase - ASTBlockStartOffset};
2812	Stream.EmitRecordWithBlob(Abbrev: MacroOffsetAbbrev, Vals: Record, Blob: bytes(v: MacroOffsets));
2813	}
2814	}
2815
2816	void ASTWriter::WritePreprocessorDetail(PreprocessingRecord &PPRec,
2817	uint64_t MacroOffsetsBase) {
2818	if (PPRec.local_begin() == PPRec.local_end())
2819	return;
2820
2821	SmallVector<PPEntityOffset, 64> PreprocessedEntityOffsets;
2822
2823	// Enter the preprocessor block.
2824	Stream.EnterSubblock(BlockID: PREPROCESSOR_DETAIL_BLOCK_ID, CodeLen: 3);
2825
2826	// If the preprocessor has a preprocessing record, emit it.
2827	unsigned NumPreprocessingRecords = 0;
2828	using namespace llvm;
2829
2830	// Set up the abbreviation for
2831	unsigned InclusionAbbrev = 0;
2832	{
2833	auto Abbrev = std::make_shared<BitCodeAbbrev>();
2834	Abbrev->Add(OpInfo: BitCodeAbbrevOp(PPD_INCLUSION_DIRECTIVE));
2835	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // filename length
2836	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // in quotes
2837	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // kind
2838	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // imported module
2839	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
2840	InclusionAbbrev = Stream.EmitAbbrev(Abbv: std::move(Abbrev));
2841	}
2842
2843	unsigned FirstPreprocessorEntityID
2844	= (Chain ? PPRec.getNumLoadedPreprocessedEntities() : 0)
2845	+ NUM_PREDEF_PP_ENTITY_IDS;
2846	unsigned NextPreprocessorEntityID = FirstPreprocessorEntityID;
2847	RecordData Record;
2848	for (PreprocessingRecord::iterator E = PPRec.local_begin(),
2849	EEnd = PPRec.local_end();
2850	E != EEnd;
2851	(void)++E, ++NumPreprocessingRecords, ++NextPreprocessorEntityID) {
2852	Record.clear();
2853
2854	uint64_t Offset = Stream.GetCurrentBitNo() - MacroOffsetsBase;
2855	assert((Offset >> 32) == 0 && "Preprocessed entity offset too large");
2856	SourceRange R = getAdjustedRange(Range: (*E)->getSourceRange());
2857	PreprocessedEntityOffsets.emplace_back(
2858	Args: getRawSourceLocationEncoding(Loc: R.getBegin()),
2859	Args: getRawSourceLocationEncoding(Loc: R.getEnd()), Args&: Offset);
2860
2861	if (auto *MD = dyn_cast<MacroDefinitionRecord>(Val: *E)) {
2862	// Record this macro definition's ID.
2863	MacroDefinitions[MD] = NextPreprocessorEntityID;
2864
2865	AddIdentifierRef(II: MD->getName(), Record);
2866	Stream.EmitRecord(Code: PPD_MACRO_DEFINITION, Vals: Record);
2867	continue;
2868	}
2869
2870	if (auto *ME = dyn_cast<MacroExpansion>(Val: *E)) {
2871	Record.push_back(Elt: ME->isBuiltinMacro());
2872	if (ME->isBuiltinMacro())
2873	AddIdentifierRef(II: ME->getName(), Record);
2874	else
2875	Record.push_back(Elt: MacroDefinitions[ME->getDefinition()]);
2876	Stream.EmitRecord(Code: PPD_MACRO_EXPANSION, Vals: Record);
2877	continue;
2878	}
2879
2880	if (auto *ID = dyn_cast<InclusionDirective>(Val: *E)) {
2881	Record.push_back(Elt: PPD_INCLUSION_DIRECTIVE);
2882	Record.push_back(Elt: ID->getFileName().size());
2883	Record.push_back(Elt: ID->wasInQuotes());
2884	Record.push_back(Elt: static_cast<unsigned>(ID->getKind()));
2885	Record.push_back(Elt: ID->importedModule());
2886	SmallString<64> Buffer;
2887	Buffer += ID->getFileName();
2888	// Check that the FileEntry is not null because it was not resolved and
2889	// we create a PCH even with compiler errors.
2890	if (ID->getFile())
2891	Buffer += ID->getFile()->getName();
2892	Stream.EmitRecordWithBlob(Abbrev: InclusionAbbrev, Vals: Record, Blob: Buffer);
2893	continue;
2894	}
2895
2896	llvm_unreachable("Unhandled PreprocessedEntity in ASTWriter");
2897	}
2898	Stream.ExitBlock();
2899
2900	// Write the offsets table for the preprocessing record.
2901	if (NumPreprocessingRecords > 0) {
2902	assert(PreprocessedEntityOffsets.size() == NumPreprocessingRecords);
2903
2904	// Write the offsets table for identifier IDs.
2905	using namespace llvm;
2906
2907	auto Abbrev = std::make_shared<BitCodeAbbrev>();
2908	Abbrev->Add(OpInfo: BitCodeAbbrevOp(PPD_ENTITIES_OFFSETS));
2909	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // first pp entity
2910	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
2911	unsigned PPEOffsetAbbrev = Stream.EmitAbbrev(Abbv: std::move(Abbrev));
2912
2913	RecordData::value_type Record[] = {PPD_ENTITIES_OFFSETS,
2914	FirstPreprocessorEntityID -
2915	NUM_PREDEF_PP_ENTITY_IDS};
2916	Stream.EmitRecordWithBlob(Abbrev: PPEOffsetAbbrev, Vals: Record,
2917	Blob: bytes(v: PreprocessedEntityOffsets));
2918	}
2919
2920	// Write the skipped region table for the preprocessing record.
2921	ArrayRef<SourceRange> SkippedRanges = PPRec.getSkippedRanges();
2922	if (SkippedRanges.size() > 0) {
2923	std::vector<PPSkippedRange> SerializedSkippedRanges;
2924	SerializedSkippedRanges.reserve(n: SkippedRanges.size());
2925	for (auto const& Range : SkippedRanges)
2926	SerializedSkippedRanges.emplace_back(
2927	args: getRawSourceLocationEncoding(Loc: Range.getBegin()),
2928	args: getRawSourceLocationEncoding(Loc: Range.getEnd()));
2929
2930	using namespace llvm;
2931	auto Abbrev = std::make_shared<BitCodeAbbrev>();
2932	Abbrev->Add(OpInfo: BitCodeAbbrevOp(PPD_SKIPPED_RANGES));
2933	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
2934	unsigned PPESkippedRangeAbbrev = Stream.EmitAbbrev(Abbv: std::move(Abbrev));
2935
2936	Record.clear();
2937	Record.push_back(Elt: PPD_SKIPPED_RANGES);
2938	Stream.EmitRecordWithBlob(Abbrev: PPESkippedRangeAbbrev, Vals: Record,
2939	Blob: bytes(v: SerializedSkippedRanges));
2940	}
2941	}
2942
2943	unsigned ASTWriter::getLocalOrImportedSubmoduleID(const Module *Mod) {
2944	if (!Mod)
2945	return 0;
2946
2947	auto Known = SubmoduleIDs.find(Val: Mod);
2948	if (Known != SubmoduleIDs.end())
2949	return Known->second;
2950
2951	auto *Top = Mod->getTopLevelModule();
2952	if (Top != WritingModule &&
2953	(getLangOpts().CompilingPCH ||
2954	!Top->fullModuleNameIs(nameParts: StringRef(getLangOpts().CurrentModule))))
2955	return 0;
2956
2957	return SubmoduleIDs[Mod] = NextSubmoduleID++;
2958	}
2959
2960	unsigned ASTWriter::getSubmoduleID(Module *Mod) {
2961	unsigned ID = getLocalOrImportedSubmoduleID(Mod);
2962	// FIXME: This can easily happen, if we have a reference to a submodule that
2963	// did not result in us loading a module file for that submodule. For
2964	// instance, a cross-top-level-module 'conflict' declaration will hit this.
2965	// assert((ID || !Mod) &&
2966	// "asked for module ID for non-local, non-imported module");
2967	return ID;
2968	}
2969
2970	/// Compute the number of modules within the given tree (including the
2971	/// given module).
2972	static unsigned getNumberOfModules(Module *Mod) {
2973	unsigned ChildModules = 0;
2974	for (auto *Submodule : Mod->submodules())
2975	ChildModules += getNumberOfModules(Mod: Submodule);
2976
2977	return ChildModules + 1;
2978	}
2979
2980	void ASTWriter::WriteSubmodules(Module *WritingModule, ASTContext *Context) {
2981	// Enter the submodule description block.
2982	Stream.EnterSubblock(BlockID: SUBMODULE_BLOCK_ID, /*bits for abbreviations*/CodeLen: 5);
2983
2984	// Write the abbreviations needed for the submodules block.
2985	using namespace llvm;
2986
2987	auto Abbrev = std::make_shared<BitCodeAbbrev>();
2988	Abbrev->Add(OpInfo: BitCodeAbbrevOp(SUBMODULE_DEFINITION));
2989	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ID
2990	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Parent
2991	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // Kind
2992	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // Definition location
2993	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // Inferred allowed by
2994	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsFramework
2995	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsExplicit
2996	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsSystem
2997	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsExternC
2998	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // InferSubmodules...
2999	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // InferExplicit...
3000	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // InferExportWild...
3001	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ConfigMacrosExh...
3002	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ModuleMapIsPriv...
3003	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // NamedModuleHasN...
3004	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Name
3005	unsigned DefinitionAbbrev = Stream.EmitAbbrev(Abbv: std::move(Abbrev));
3006
3007	Abbrev = std::make_shared<BitCodeAbbrev>();
3008	Abbrev->Add(OpInfo: BitCodeAbbrevOp(SUBMODULE_UMBRELLA_HEADER));
3009	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Name
3010	unsigned UmbrellaAbbrev = Stream.EmitAbbrev(Abbv: std::move(Abbrev));
3011
3012	Abbrev = std::make_shared<BitCodeAbbrev>();
3013	Abbrev->Add(OpInfo: BitCodeAbbrevOp(SUBMODULE_HEADER));
3014	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Name
3015	unsigned HeaderAbbrev = Stream.EmitAbbrev(Abbv: std::move(Abbrev));
3016
3017	Abbrev = std::make_shared<BitCodeAbbrev>();
3018	Abbrev->Add(OpInfo: BitCodeAbbrevOp(SUBMODULE_TOPHEADER));
3019	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Name
3020	unsigned TopHeaderAbbrev = Stream.EmitAbbrev(Abbv: std::move(Abbrev));
3021
3022	Abbrev = std::make_shared<BitCodeAbbrev>();
3023	Abbrev->Add(OpInfo: BitCodeAbbrevOp(SUBMODULE_UMBRELLA_DIR));
3024	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Name
3025	unsigned UmbrellaDirAbbrev = Stream.EmitAbbrev(Abbv: std::move(Abbrev));
3026
3027	Abbrev = std::make_shared<BitCodeAbbrev>();
3028	Abbrev->Add(OpInfo: BitCodeAbbrevOp(SUBMODULE_REQUIRES));
3029	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // State
3030	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Feature
3031	unsigned RequiresAbbrev = Stream.EmitAbbrev(Abbv: std::move(Abbrev));
3032
3033	Abbrev = std::make_shared<BitCodeAbbrev>();
3034	Abbrev->Add(OpInfo: BitCodeAbbrevOp(SUBMODULE_EXCLUDED_HEADER));
3035	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Name
3036	unsigned ExcludedHeaderAbbrev = Stream.EmitAbbrev(Abbv: std::move(Abbrev));
3037
3038	Abbrev = std::make_shared<BitCodeAbbrev>();
3039	Abbrev->Add(OpInfo: BitCodeAbbrevOp(SUBMODULE_TEXTUAL_HEADER));
3040	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Name
3041	unsigned TextualHeaderAbbrev = Stream.EmitAbbrev(Abbv: std::move(Abbrev));
3042
3043	Abbrev = std::make_shared<BitCodeAbbrev>();
3044	Abbrev->Add(OpInfo: BitCodeAbbrevOp(SUBMODULE_PRIVATE_HEADER));
3045	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Name
3046	unsigned PrivateHeaderAbbrev = Stream.EmitAbbrev(Abbv: std::move(Abbrev));
3047
3048	Abbrev = std::make_shared<BitCodeAbbrev>();
3049	Abbrev->Add(OpInfo: BitCodeAbbrevOp(SUBMODULE_PRIVATE_TEXTUAL_HEADER));
3050	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Name
3051	unsigned PrivateTextualHeaderAbbrev = Stream.EmitAbbrev(Abbv: std::move(Abbrev));
3052
3053	Abbrev = std::make_shared<BitCodeAbbrev>();
3054	Abbrev->Add(OpInfo: BitCodeAbbrevOp(SUBMODULE_LINK_LIBRARY));
3055	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsFramework
3056	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Name
3057	unsigned LinkLibraryAbbrev = Stream.EmitAbbrev(Abbv: std::move(Abbrev));
3058
3059	Abbrev = std::make_shared<BitCodeAbbrev>();
3060	Abbrev->Add(OpInfo: BitCodeAbbrevOp(SUBMODULE_CONFIG_MACRO));
3061	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Macro name
3062	unsigned ConfigMacroAbbrev = Stream.EmitAbbrev(Abbv: std::move(Abbrev));
3063
3064	Abbrev = std::make_shared<BitCodeAbbrev>();
3065	Abbrev->Add(OpInfo: BitCodeAbbrevOp(SUBMODULE_CONFLICT));
3066	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Other module
3067	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Message
3068	unsigned ConflictAbbrev = Stream.EmitAbbrev(Abbv: std::move(Abbrev));
3069
3070	Abbrev = std::make_shared<BitCodeAbbrev>();
3071	Abbrev->Add(OpInfo: BitCodeAbbrevOp(SUBMODULE_EXPORT_AS));
3072	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Macro name
3073	unsigned ExportAsAbbrev = Stream.EmitAbbrev(Abbv: std::move(Abbrev));
3074
3075	// Write the submodule metadata block.
3076	RecordData::value_type Record[] = {
3077	getNumberOfModules(Mod: WritingModule),
3078	FirstSubmoduleID - NUM_PREDEF_SUBMODULE_IDS};
3079	Stream.EmitRecord(Code: SUBMODULE_METADATA, Vals: Record);
3080
3081	// Write all of the submodules.
3082	std::queue<Module *> Q;
3083	Q.push(x: WritingModule);
3084	while (!Q.empty()) {
3085	Module *Mod = Q.front();
3086	Q.pop();
3087	unsigned ID = getSubmoduleID(Mod);
3088
3089	uint64_t ParentID = 0;
3090	if (Mod->Parent) {
3091	assert(SubmoduleIDs[Mod->Parent] && "Submodule parent not written?");
3092	ParentID = SubmoduleIDs[Mod->Parent];
3093	}
3094
3095	SourceLocationEncoding::RawLocEncoding DefinitionLoc =
3096	getRawSourceLocationEncoding(Loc: getAdjustedLocation(Loc: Mod->DefinitionLoc));
3097
3098	ModuleMap &ModMap = PP->getHeaderSearchInfo().getModuleMap();
3099	FileID UnadjustedInferredFID;
3100	if (Mod->IsInferred)
3101	UnadjustedInferredFID = ModMap.getModuleMapFileIDForUniquing(M: Mod);
3102	int InferredFID = getAdjustedFileID(FID: UnadjustedInferredFID).getOpaqueValue();
3103
3104	// Emit the definition of the block.
3105	{
3106	RecordData::value_type Record[] = {SUBMODULE_DEFINITION,
3107	ID,
3108	ParentID,
3109	(RecordData::value_type)Mod->Kind,
3110	DefinitionLoc,
3111	(RecordData::value_type)InferredFID,
3112	Mod->IsFramework,
3113	Mod->IsExplicit,
3114	Mod->IsSystem,
3115	Mod->IsExternC,
3116	Mod->InferSubmodules,
3117	Mod->InferExplicitSubmodules,
3118	Mod->InferExportWildcard,
3119	Mod->ConfigMacrosExhaustive,
3120	Mod->ModuleMapIsPrivate,
3121	Mod->NamedModuleHasInit};
3122	Stream.EmitRecordWithBlob(Abbrev: DefinitionAbbrev, Vals: Record, Blob: Mod->Name);
3123	}
3124
3125	// Emit the requirements.
3126	for (const auto &R : Mod->Requirements) {
3127	RecordData::value_type Record[] = {SUBMODULE_REQUIRES, R.RequiredState};
3128	Stream.EmitRecordWithBlob(Abbrev: RequiresAbbrev, Vals: Record, Blob: R.FeatureName);
3129	}
3130
3131	// Emit the umbrella header, if there is one.
3132	if (std::optional<Module::Header> UmbrellaHeader =
3133	Mod->getUmbrellaHeaderAsWritten()) {
3134	RecordData::value_type Record[] = {SUBMODULE_UMBRELLA_HEADER};
3135	Stream.EmitRecordWithBlob(Abbrev: UmbrellaAbbrev, Vals: Record,
3136	Blob: UmbrellaHeader->NameAsWritten);
3137	} else if (std::optional<Module::DirectoryName> UmbrellaDir =
3138	Mod->getUmbrellaDirAsWritten()) {
3139	RecordData::value_type Record[] = {SUBMODULE_UMBRELLA_DIR};
3140	Stream.EmitRecordWithBlob(Abbrev: UmbrellaDirAbbrev, Vals: Record,
3141	Blob: UmbrellaDir->NameAsWritten);
3142	}
3143
3144	// Emit the headers.
3145	struct {
3146	unsigned RecordKind;
3147	unsigned Abbrev;
3148	Module::HeaderKind HeaderKind;
3149	} HeaderLists[] = {
3150	{.RecordKind: SUBMODULE_HEADER, .Abbrev: HeaderAbbrev, .HeaderKind: Module::HK_Normal},
3151	{.RecordKind: SUBMODULE_TEXTUAL_HEADER, .Abbrev: TextualHeaderAbbrev, .HeaderKind: Module::HK_Textual},
3152	{.RecordKind: SUBMODULE_PRIVATE_HEADER, .Abbrev: PrivateHeaderAbbrev, .HeaderKind: Module::HK_Private},
3153	{.RecordKind: SUBMODULE_PRIVATE_TEXTUAL_HEADER, .Abbrev: PrivateTextualHeaderAbbrev,
3154	.HeaderKind: Module::HK_PrivateTextual},
3155	{.RecordKind: SUBMODULE_EXCLUDED_HEADER, .Abbrev: ExcludedHeaderAbbrev, .HeaderKind: Module::HK_Excluded}
3156	};
3157	for (const auto &HL : HeaderLists) {
3158	RecordData::value_type Record[] = {HL.RecordKind};
3159	for (const auto &H : Mod->getHeaders(HK: HL.HeaderKind))
3160	Stream.EmitRecordWithBlob(Abbrev: HL.Abbrev, Vals: Record, Blob: H.NameAsWritten);
3161	}
3162
3163	// Emit the top headers.
3164	{
3165	RecordData::value_type Record[] = {SUBMODULE_TOPHEADER};
3166	for (FileEntryRef H : Mod->getTopHeaders(FileMgr&: PP->getFileManager())) {
3167	SmallString<128> HeaderName(H.getName());
3168	PreparePathForOutput(Path&: HeaderName);
3169	Stream.EmitRecordWithBlob(Abbrev: TopHeaderAbbrev, Vals: Record, Blob: HeaderName);
3170	}
3171	}
3172
3173	// Emit the imports.
3174	if (!Mod->Imports.empty()) {
3175	RecordData Record;
3176	for (auto *I : Mod->Imports)
3177	Record.push_back(Elt: getSubmoduleID(Mod: I));
3178	Stream.EmitRecord(Code: SUBMODULE_IMPORTS, Vals: Record);
3179	}
3180
3181	// Emit the modules affecting compilation that were not imported.
3182	if (!Mod->AffectingClangModules.empty()) {
3183	RecordData Record;
3184	for (auto *I : Mod->AffectingClangModules)
3185	Record.push_back(Elt: getSubmoduleID(Mod: I));
3186	Stream.EmitRecord(Code: SUBMODULE_AFFECTING_MODULES, Vals: Record);
3187	}
3188
3189	// Emit the exports.
3190	if (!Mod->Exports.empty()) {
3191	RecordData Record;
3192	for (const auto &E : Mod->Exports) {
3193	// FIXME: This may fail; we don't require that all exported modules
3194	// are local or imported.
3195	Record.push_back(Elt: getSubmoduleID(Mod: E.getPointer()));
3196	Record.push_back(Elt: E.getInt());
3197	}
3198	Stream.EmitRecord(Code: SUBMODULE_EXPORTS, Vals: Record);
3199	}
3200
3201	//FIXME: How do we emit the 'use'd modules? They may not be submodules.
3202	// Might be unnecessary as use declarations are only used to build the
3203	// module itself.
3204
3205	// TODO: Consider serializing undeclared uses of modules.
3206
3207	// Emit the link libraries.
3208	for (const auto &LL : Mod->LinkLibraries) {
3209	RecordData::value_type Record[] = {SUBMODULE_LINK_LIBRARY,
3210	LL.IsFramework};
3211	Stream.EmitRecordWithBlob(Abbrev: LinkLibraryAbbrev, Vals: Record, Blob: LL.Library);
3212	}
3213
3214	// Emit the conflicts.
3215	for (const auto &C : Mod->Conflicts) {
3216	// FIXME: This may fail; we don't require that all conflicting modules
3217	// are local or imported.
3218	RecordData::value_type Record[] = {SUBMODULE_CONFLICT,
3219	getSubmoduleID(Mod: C.Other)};
3220	Stream.EmitRecordWithBlob(Abbrev: ConflictAbbrev, Vals: Record, Blob: C.Message);
3221	}
3222
3223	// Emit the configuration macros.
3224	for (const auto &CM : Mod->ConfigMacros) {
3225	RecordData::value_type Record[] = {SUBMODULE_CONFIG_MACRO};
3226	Stream.EmitRecordWithBlob(Abbrev: ConfigMacroAbbrev, Vals: Record, Blob: CM);
3227	}
3228
3229	// Emit the reachable initializers.
3230	// The initializer may only be unreachable in reduced BMI.
3231	if (Context) {
3232	RecordData Inits;
3233	for (Decl *D : Context->getModuleInitializers(M: Mod))
3234	if (wasDeclEmitted(D))
3235	AddDeclRef(D, Record&: Inits);
3236	if (!Inits.empty())
3237	Stream.EmitRecord(Code: SUBMODULE_INITIALIZERS, Vals: Inits);
3238	}
3239
3240	// Emit the name of the re-exported module, if any.
3241	if (!Mod->ExportAsModule.empty()) {
3242	RecordData::value_type Record[] = {SUBMODULE_EXPORT_AS};
3243	Stream.EmitRecordWithBlob(Abbrev: ExportAsAbbrev, Vals: Record, Blob: Mod->ExportAsModule);
3244	}
3245
3246	// Queue up the submodules of this module.
3247	for (auto *M : Mod->submodules())
3248	Q.push(x: M);
3249	}
3250
3251	Stream.ExitBlock();
3252
3253	assert((NextSubmoduleID - FirstSubmoduleID ==
3254	getNumberOfModules(WritingModule)) &&
3255	"Wrong # of submodules; found a reference to a non-local, "
3256	"non-imported submodule?");
3257	}
3258
3259	void ASTWriter::WritePragmaDiagnosticMappings(const DiagnosticsEngine &Diag,
3260	bool isModule) {
3261	llvm::SmallDenseMap<const DiagnosticsEngine::DiagState *, unsigned, 64>
3262	DiagStateIDMap;
3263	unsigned CurrID = 0;
3264	RecordData Record;
3265
3266	auto EncodeDiagStateFlags =
3267	[](const DiagnosticsEngine::DiagState *DS) -> unsigned {
3268	unsigned Result = (unsigned)DS->ExtBehavior;
3269	for (unsigned Val :
3270	{(unsigned)DS->IgnoreAllWarnings, (unsigned)DS->EnableAllWarnings,
3271	(unsigned)DS->WarningsAsErrors, (unsigned)DS->ErrorsAsFatal,
3272	(unsigned)DS->SuppressSystemWarnings})
3273	Result = (Result << 1) | Val;
3274	return Result;
3275	};
3276
3277	unsigned Flags = EncodeDiagStateFlags(Diag.DiagStatesByLoc.FirstDiagState);
3278	Record.push_back(Elt: Flags);
3279
3280	auto AddDiagState = [&](const DiagnosticsEngine::DiagState *State,
3281	bool IncludeNonPragmaStates) {
3282	// Ensure that the diagnostic state wasn't modified since it was created.
3283	// We will not correctly round-trip this information otherwise.
3284	assert(Flags == EncodeDiagStateFlags(State) &&
3285	"diag state flags vary in single AST file");
3286
3287	// If we ever serialize non-pragma mappings outside the initial state, the
3288	// code below will need to consider more than getDefaultMapping.
3289	assert(!IncludeNonPragmaStates ||
3290	State == Diag.DiagStatesByLoc.FirstDiagState);
3291
3292	unsigned &DiagStateID = DiagStateIDMap[State];
3293	Record.push_back(Elt: DiagStateID);
3294
3295	if (DiagStateID == 0) {
3296	DiagStateID = ++CurrID;
3297	SmallVector<std::pair<unsigned, DiagnosticMapping>> Mappings;
3298
3299	// Add a placeholder for the number of mappings.
3300	auto SizeIdx = Record.size();
3301	Record.emplace_back();
3302	for (const auto &I : *State) {
3303	// Maybe skip non-pragmas.
3304	if (!I.second.isPragma() && !IncludeNonPragmaStates)
3305	continue;
3306	// Skip default mappings. We have a mapping for every diagnostic ever
3307	// emitted, regardless of whether it was customized.
3308	if (!I.second.isPragma() &&
3309	I.second == Diag.getDiagnosticIDs()->getDefaultMapping(DiagID: I.first))
3310	continue;
3311	Mappings.push_back(Elt: I);
3312	}
3313
3314	// Sort by diag::kind for deterministic output.
3315	llvm::sort(C&: Mappings, Comp: llvm::less_first());
3316
3317	for (const auto &I : Mappings) {
3318	Record.push_back(Elt: I.first);
3319	Record.push_back(Elt: I.second.serialize());
3320	}
3321	// Update the placeholder.
3322	Record[SizeIdx] = (Record.size() - SizeIdx) / 2;
3323	}
3324	};
3325
3326	AddDiagState(Diag.DiagStatesByLoc.FirstDiagState, isModule);
3327
3328	// Reserve a spot for the number of locations with state transitions.
3329	auto NumLocationsIdx = Record.size();
3330	Record.emplace_back();
3331
3332	// Emit the state transitions.
3333	unsigned NumLocations = 0;
3334	for (auto &FileIDAndFile : Diag.DiagStatesByLoc.Files) {
3335	if (!FileIDAndFile.first.isValid() ||
3336	!FileIDAndFile.second.HasLocalTransitions)
3337	continue;
3338	++NumLocations;
3339
3340	AddFileID(FID: FileIDAndFile.first, Record);
3341
3342	Record.push_back(Elt: FileIDAndFile.second.StateTransitions.size());
3343	for (auto &StatePoint : FileIDAndFile.second.StateTransitions) {
3344	Record.push_back(Elt: getAdjustedOffset(Offset: StatePoint.Offset));
3345	AddDiagState(StatePoint.State, false);
3346	}
3347	}
3348
3349	// Backpatch the number of locations.
3350	Record[NumLocationsIdx] = NumLocations;
3351
3352	// Emit CurDiagStateLoc. Do it last in order to match source order.
3353	//
3354	// This also protects against a hypothetical corner case with simulating
3355	// -Werror settings for implicit modules in the ASTReader, where reading
3356	// CurDiagState out of context could change whether warning pragmas are
3357	// treated as errors.
3358	AddSourceLocation(Loc: Diag.DiagStatesByLoc.CurDiagStateLoc, Record);
3359	AddDiagState(Diag.DiagStatesByLoc.CurDiagState, false);
3360
3361	Stream.EmitRecord(Code: DIAG_PRAGMA_MAPPINGS, Vals: Record);
3362	}
3363
3364	//===----------------------------------------------------------------------===//
3365	// Type Serialization
3366	//===----------------------------------------------------------------------===//
3367
3368	/// Write the representation of a type to the AST stream.
3369	void ASTWriter::WriteType(ASTContext &Context, QualType T) {
3370	TypeIdx &IdxRef = TypeIdxs[T];
3371	if (IdxRef.getValue() == 0) // we haven't seen this type before.
3372	IdxRef = TypeIdx(0, NextTypeID++);
3373	TypeIdx Idx = IdxRef;
3374
3375	assert(Idx.getModuleFileIndex() == 0 && "Re-writing a type from a prior AST");
3376	assert(Idx.getValue() >= FirstTypeID && "Writing predefined type");
3377
3378	// Emit the type's representation.
3379	uint64_t Offset =
3380	ASTTypeWriter(Context, *this).write(T) - DeclTypesBlockStartOffset;
3381
3382	// Record the offset for this type.
3383	uint64_t Index = Idx.getValue() - FirstTypeID;
3384	if (TypeOffsets.size() == Index)
3385	TypeOffsets.emplace_back(args&: Offset);
3386	else if (TypeOffsets.size() < Index) {
3387	TypeOffsets.resize(new_size: Index + 1);
3388	TypeOffsets[Index].set(Offset);
3389	} else {
3390	llvm_unreachable("Types emitted in wrong order");
3391	}
3392	}
3393
3394	//===----------------------------------------------------------------------===//
3395	// Declaration Serialization
3396	//===----------------------------------------------------------------------===//
3397
3398	static bool IsInternalDeclFromFileContext(const Decl *D) {
3399	auto *ND = dyn_cast<NamedDecl>(Val: D);
3400	if (!ND)
3401	return false;
3402
3403	if (!D->getDeclContext()->getRedeclContext()->isFileContext())
3404	return false;
3405
3406	return ND->getFormalLinkage() == Linkage::Internal;
3407	}
3408
3409	/// Write the block containing all of the declaration IDs
3410	/// lexically declared within the given DeclContext.
3411	///
3412	/// \returns the offset of the DECL_CONTEXT_LEXICAL block within the
3413	/// bitstream, or 0 if no block was written.
3414	uint64_t ASTWriter::WriteDeclContextLexicalBlock(ASTContext &Context,
3415	const DeclContext *DC) {
3416	if (DC->decls_empty())
3417	return 0;
3418
3419	// In reduced BMI, we don't care the declarations in functions.
3420	if (GeneratingReducedBMI && DC->isFunctionOrMethod())
3421	return 0;
3422
3423	uint64_t Offset = Stream.GetCurrentBitNo();
3424	SmallVector<DeclID, 128> KindDeclPairs;
3425	for (const auto *D : DC->decls()) {
3426	if (DoneWritingDeclsAndTypes && !wasDeclEmitted(D))
3427	continue;
3428
3429	// We don't need to write decls with internal linkage into reduced BMI.
3430	// If such decls gets emitted due to it get used from inline functions,
3431	// the program illegal. However, there are too many use of static inline
3432	// functions in the global module fragment and it will be breaking change
3433	// to forbid that. So we have to allow to emit such declarations from GMF.
3434	if (GeneratingReducedBMI && !D->isFromExplicitGlobalModule() &&
3435	IsInternalDeclFromFileContext(D))
3436	continue;
3437
3438	KindDeclPairs.push_back(Elt: D->getKind());
3439	KindDeclPairs.push_back(Elt: GetDeclRef(D).getRawValue());
3440	}
3441
3442	++NumLexicalDeclContexts;
3443	RecordData::value_type Record[] = {DECL_CONTEXT_LEXICAL};
3444	Stream.EmitRecordWithBlob(Abbrev: DeclContextLexicalAbbrev, Vals: Record,
3445	Blob: bytes(v: KindDeclPairs));
3446	return Offset;
3447	}
3448
3449	void ASTWriter::WriteTypeDeclOffsets() {
3450	using namespace llvm;
3451
3452	// Write the type offsets array
3453	auto Abbrev = std::make_shared<BitCodeAbbrev>();
3454	Abbrev->Add(OpInfo: BitCodeAbbrevOp(TYPE_OFFSET));
3455	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // # of types
3456	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // types block
3457	unsigned TypeOffsetAbbrev = Stream.EmitAbbrev(Abbv: std::move(Abbrev));
3458	{
3459	RecordData::value_type Record[] = {TYPE_OFFSET, TypeOffsets.size()};
3460	Stream.EmitRecordWithBlob(Abbrev: TypeOffsetAbbrev, Vals: Record, Blob: bytes(v: TypeOffsets));
3461	}
3462
3463	// Write the declaration offsets array
3464	Abbrev = std::make_shared<BitCodeAbbrev>();
3465	Abbrev->Add(OpInfo: BitCodeAbbrevOp(DECL_OFFSET));
3466	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // # of declarations
3467	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // declarations block
3468	unsigned DeclOffsetAbbrev = Stream.EmitAbbrev(Abbv: std::move(Abbrev));
3469	{
3470	RecordData::value_type Record[] = {DECL_OFFSET, DeclOffsets.size()};
3471	Stream.EmitRecordWithBlob(Abbrev: DeclOffsetAbbrev, Vals: Record, Blob: bytes(v: DeclOffsets));
3472	}
3473	}
3474
3475	void ASTWriter::WriteFileDeclIDsMap() {
3476	using namespace llvm;
3477
3478	SmallVector<std::pair<FileID, DeclIDInFileInfo *>, 64> SortedFileDeclIDs;
3479	SortedFileDeclIDs.reserve(N: FileDeclIDs.size());
3480	for (const auto &P : FileDeclIDs)
3481	SortedFileDeclIDs.push_back(Elt: std::make_pair(x: P.first, y: P.second.get()));
3482	llvm::sort(C&: SortedFileDeclIDs, Comp: llvm::less_first());
3483
3484	// Join the vectors of DeclIDs from all files.
3485	SmallVector<DeclID, 256> FileGroupedDeclIDs;
3486	for (auto &FileDeclEntry : SortedFileDeclIDs) {
3487	DeclIDInFileInfo &Info = *FileDeclEntry.second;
3488	Info.FirstDeclIndex = FileGroupedDeclIDs.size();
3489	llvm::stable_sort(Range&: Info.DeclIDs);
3490	for (auto &LocDeclEntry : Info.DeclIDs)
3491	FileGroupedDeclIDs.push_back(Elt: LocDeclEntry.second.getRawValue());
3492	}
3493
3494	auto Abbrev = std::make_shared<BitCodeAbbrev>();
3495	Abbrev->Add(OpInfo: BitCodeAbbrevOp(FILE_SORTED_DECLS));
3496	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
3497	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
3498	unsigned AbbrevCode = Stream.EmitAbbrev(Abbv: std::move(Abbrev));
3499	RecordData::value_type Record[] = {FILE_SORTED_DECLS,
3500	FileGroupedDeclIDs.size()};
3501	Stream.EmitRecordWithBlob(Abbrev: AbbrevCode, Vals: Record, Blob: bytes(v: FileGroupedDeclIDs));
3502	}
3503
3504	void ASTWriter::WriteComments(ASTContext &Context) {
3505	Stream.EnterSubblock(BlockID: COMMENTS_BLOCK_ID, CodeLen: 3);
3506	auto _ = llvm::make_scope_exit(F: [this] { Stream.ExitBlock(); });
3507	if (!PP->getPreprocessorOpts().WriteCommentListToPCH)
3508	return;
3509
3510	// Don't write comments to BMI to reduce the size of BMI.
3511	// If language services (e.g., clangd) want such abilities,
3512	// we can offer a special option then.
3513	if (isWritingStdCXXNamedModules())
3514	return;
3515
3516	RecordData Record;
3517	for (const auto &FO : Context.Comments.OrderedComments) {
3518	for (const auto &OC : FO.second) {
3519	const RawComment *I = OC.second;
3520	Record.clear();
3521	AddSourceRange(Range: I->getSourceRange(), Record);
3522	Record.push_back(Elt: I->getKind());
3523	Record.push_back(Elt: I->isTrailingComment());
3524	Record.push_back(Elt: I->isAlmostTrailingComment());
3525	Stream.EmitRecord(Code: COMMENTS_RAW_COMMENT, Vals: Record);
3526	}
3527	}
3528	}
3529
3530	//===----------------------------------------------------------------------===//
3531	// Global Method Pool and Selector Serialization
3532	//===----------------------------------------------------------------------===//
3533
3534	namespace {
3535
3536	// Trait used for the on-disk hash table used in the method pool.
3537	class ASTMethodPoolTrait {
3538	ASTWriter &Writer;
3539
3540	public:
3541	using key_type = Selector;
3542	using key_type_ref = key_type;
3543
3544	struct data_type {
3545	SelectorID ID;
3546	ObjCMethodList Instance, Factory;
3547	};
3548	using data_type_ref = const data_type &;
3549
3550	using hash_value_type = unsigned;
3551	using offset_type = unsigned;
3552
3553	explicit ASTMethodPoolTrait(ASTWriter &Writer) : Writer(Writer) {}
3554
3555	static hash_value_type ComputeHash(Selector Sel) {
3556	return serialization::ComputeHash(Sel);
3557	}
3558
3559	std::pair<unsigned, unsigned>
3560	EmitKeyDataLength(raw_ostream& Out, Selector Sel,
3561	data_type_ref Methods) {
3562	unsigned KeyLen =
3563	2 + (Sel.getNumArgs() ? Sel.getNumArgs() * sizeof(IdentifierID)
3564	: sizeof(IdentifierID));
3565	unsigned DataLen = 4 + 2 + 2; // 2 bytes for each of the method counts
3566	for (const ObjCMethodList *Method = &Methods.Instance; Method;
3567	Method = Method->getNext())
3568	if (ShouldWriteMethodListNode(Node: Method))
3569	DataLen += sizeof(DeclID);
3570	for (const ObjCMethodList *Method = &Methods.Factory; Method;
3571	Method = Method->getNext())
3572	if (ShouldWriteMethodListNode(Node: Method))
3573	DataLen += sizeof(DeclID);
3574	return emitULEBKeyDataLength(KeyLen, DataLen, Out);
3575	}
3576
3577	void EmitKey(raw_ostream& Out, Selector Sel, unsigned) {
3578	using namespace llvm::support;
3579
3580	endian::Writer LE(Out, llvm::endianness::little);
3581	uint64_t Start = Out.tell();
3582	assert((Start >> 32) == 0 && "Selector key offset too large");
3583	Writer.SetSelectorOffset(Sel, Offset: Start);
3584	unsigned N = Sel.getNumArgs();
3585	LE.write<uint16_t>(Val: N);
3586	if (N == 0)
3587	N = 1;
3588	for (unsigned I = 0; I != N; ++I)
3589	LE.write<IdentifierID>(
3590	Val: Writer.getIdentifierRef(II: Sel.getIdentifierInfoForSlot(argIndex: I)));
3591	}
3592
3593	void EmitData(raw_ostream& Out, key_type_ref,
3594	data_type_ref Methods, unsigned DataLen) {
3595	using namespace llvm::support;
3596
3597	endian::Writer LE(Out, llvm::endianness::little);
3598	uint64_t Start = Out.tell(); (void)Start;
3599	LE.write<uint32_t>(Val: Methods.ID);
3600	unsigned NumInstanceMethods = 0;
3601	for (const ObjCMethodList *Method = &Methods.Instance; Method;
3602	Method = Method->getNext())
3603	if (ShouldWriteMethodListNode(Node: Method))
3604	++NumInstanceMethods;
3605
3606	unsigned NumFactoryMethods = 0;
3607	for (const ObjCMethodList *Method = &Methods.Factory; Method;
3608	Method = Method->getNext())
3609	if (ShouldWriteMethodListNode(Node: Method))
3610	++NumFactoryMethods;
3611
3612	unsigned InstanceBits = Methods.Instance.getBits();
3613	assert(InstanceBits < 4);
3614	unsigned InstanceHasMoreThanOneDeclBit =
3615	Methods.Instance.hasMoreThanOneDecl();
3616	unsigned FullInstanceBits = (NumInstanceMethods << 3) |
3617	(InstanceHasMoreThanOneDeclBit << 2) |
3618	InstanceBits;
3619	unsigned FactoryBits = Methods.Factory.getBits();
3620	assert(FactoryBits < 4);
3621	unsigned FactoryHasMoreThanOneDeclBit =
3622	Methods.Factory.hasMoreThanOneDecl();
3623	unsigned FullFactoryBits = (NumFactoryMethods << 3) |
3624	(FactoryHasMoreThanOneDeclBit << 2) |
3625	FactoryBits;
3626	LE.write<uint16_t>(Val: FullInstanceBits);
3627	LE.write<uint16_t>(Val: FullFactoryBits);
3628	for (const ObjCMethodList *Method = &Methods.Instance; Method;
3629	Method = Method->getNext())
3630	if (ShouldWriteMethodListNode(Node: Method))
3631	LE.write<DeclID>(Val: (DeclID)Writer.getDeclID(Method->getMethod()));
3632	for (const ObjCMethodList *Method = &Methods.Factory; Method;
3633	Method = Method->getNext())
3634	if (ShouldWriteMethodListNode(Node: Method))
3635	LE.write<DeclID>(Val: (DeclID)Writer.getDeclID(Method->getMethod()));
3636
3637	assert(Out.tell() - Start == DataLen && "Data length is wrong");
3638	}
3639
3640	private:
3641	static bool ShouldWriteMethodListNode(const ObjCMethodList *Node) {
3642	return (Node->getMethod() && !Node->getMethod()->isFromASTFile());
3643	}
3644	};
3645
3646	} // namespace
3647
3648	/// Write ObjC data: selectors and the method pool.
3649	///
3650	/// The method pool contains both instance and factory methods, stored
3651	/// in an on-disk hash table indexed by the selector. The hash table also
3652	/// contains an empty entry for every other selector known to Sema.
3653	void ASTWriter::WriteSelectors(Sema &SemaRef) {
3654	using namespace llvm;
3655
3656	// Do we have to do anything at all?
3657	if (SemaRef.ObjC().MethodPool.empty() && SelectorIDs.empty())
3658	return;
3659	unsigned NumTableEntries = 0;
3660	// Create and write out the blob that contains selectors and the method pool.
3661	{
3662	llvm::OnDiskChainedHashTableGenerator<ASTMethodPoolTrait> Generator;
3663	ASTMethodPoolTrait Trait(*this);
3664
3665	// Create the on-disk hash table representation. We walk through every
3666	// selector we've seen and look it up in the method pool.
3667	SelectorOffsets.resize(new_size: NextSelectorID - FirstSelectorID);
3668	for (auto &SelectorAndID : SelectorIDs) {
3669	Selector S = SelectorAndID.first;
3670	SelectorID ID = SelectorAndID.second;
3671	SemaObjC::GlobalMethodPool::iterator F =
3672	SemaRef.ObjC().MethodPool.find(Val: S);
3673	ASTMethodPoolTrait::data_type Data = {
3674	.ID: ID,
3675	.Instance: ObjCMethodList(),
3676	.Factory: ObjCMethodList()
3677	};
3678	if (F != SemaRef.ObjC().MethodPool.end()) {
3679	Data.Instance = F->second.first;
3680	Data.Factory = F->second.second;
3681	}
3682	// Only write this selector if it's not in an existing AST or something
3683	// changed.
3684	if (Chain && ID < FirstSelectorID) {
3685	// Selector already exists. Did it change?
3686	bool changed = false;
3687	for (ObjCMethodList *M = &Data.Instance; M && M->getMethod();
3688	M = M->getNext()) {
3689	if (!M->getMethod()->isFromASTFile()) {
3690	changed = true;
3691	Data.Instance = *M;
3692	break;
3693	}
3694	}
3695	for (ObjCMethodList *M = &Data.Factory; M && M->getMethod();
3696	M = M->getNext()) {
3697	if (!M->getMethod()->isFromASTFile()) {
3698	changed = true;
3699	Data.Factory = *M;
3700	break;
3701	}
3702	}
3703	if (!changed)
3704	continue;
3705	} else if (Data.Instance.getMethod() || Data.Factory.getMethod()) {
3706	// A new method pool entry.
3707	++NumTableEntries;
3708	}
3709	Generator.insert(Key: S, Data, InfoObj&: Trait);
3710	}
3711
3712	// Create the on-disk hash table in a buffer.
3713	SmallString<4096> MethodPool;
3714	uint32_t BucketOffset;
3715	{
3716	using namespace llvm::support;
3717
3718	ASTMethodPoolTrait Trait(*this);
3719	llvm::raw_svector_ostream Out(MethodPool);
3720	// Make sure that no bucket is at offset 0
3721	endian::write<uint32_t>(os&: Out, value: 0, endian: llvm::endianness::little);
3722	BucketOffset = Generator.Emit(Out, InfoObj&: Trait);
3723	}
3724
3725	// Create a blob abbreviation
3726	auto Abbrev = std::make_shared<BitCodeAbbrev>();
3727	Abbrev->Add(OpInfo: BitCodeAbbrevOp(METHOD_POOL));
3728	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
3729	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
3730	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
3731	unsigned MethodPoolAbbrev = Stream.EmitAbbrev(Abbv: std::move(Abbrev));
3732
3733	// Write the method pool
3734	{
3735	RecordData::value_type Record[] = {METHOD_POOL, BucketOffset,
3736	NumTableEntries};
3737	Stream.EmitRecordWithBlob(Abbrev: MethodPoolAbbrev, Vals: Record, Blob: MethodPool);
3738	}
3739
3740	// Create a blob abbreviation for the selector table offsets.
3741	Abbrev = std::make_shared<BitCodeAbbrev>();
3742	Abbrev->Add(OpInfo: BitCodeAbbrevOp(SELECTOR_OFFSETS));
3743	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // size
3744	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // first ID
3745	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
3746	unsigned SelectorOffsetAbbrev = Stream.EmitAbbrev(Abbv: std::move(Abbrev));
3747
3748	// Write the selector offsets table.
3749	{
3750	RecordData::value_type Record[] = {
3751	SELECTOR_OFFSETS, SelectorOffsets.size(),
3752	FirstSelectorID - NUM_PREDEF_SELECTOR_IDS};
3753	Stream.EmitRecordWithBlob(Abbrev: SelectorOffsetAbbrev, Vals: Record,
3754	Blob: bytes(v: SelectorOffsets));
3755	}
3756	}
3757	}
3758
3759	/// Write the selectors referenced in @selector expression into AST file.
3760	void ASTWriter::WriteReferencedSelectorsPool(Sema &SemaRef) {
3761	using namespace llvm;
3762
3763	if (SemaRef.ObjC().ReferencedSelectors.empty())
3764	return;
3765
3766	RecordData Record;
3767	ASTRecordWriter Writer(SemaRef.Context, *this, Record);
3768
3769	// Note: this writes out all references even for a dependent AST. But it is
3770	// very tricky to fix, and given that @selector shouldn't really appear in
3771	// headers, probably not worth it. It's not a correctness issue.
3772	for (auto &SelectorAndLocation : SemaRef.ObjC().ReferencedSelectors) {
3773	Selector Sel = SelectorAndLocation.first;
3774	SourceLocation Loc = SelectorAndLocation.second;
3775	Writer.AddSelectorRef(S: Sel);
3776	Writer.AddSourceLocation(Loc);
3777	}
3778	Writer.Emit(Code: REFERENCED_SELECTOR_POOL);
3779	}
3780
3781	//===----------------------------------------------------------------------===//
3782	// Identifier Table Serialization
3783	//===----------------------------------------------------------------------===//
3784
3785	/// Determine the declaration that should be put into the name lookup table to
3786	/// represent the given declaration in this module. This is usually D itself,
3787	/// but if D was imported and merged into a local declaration, we want the most
3788	/// recent local declaration instead. The chosen declaration will be the most
3789	/// recent declaration in any module that imports this one.
3790	static NamedDecl *getDeclForLocalLookup(const LangOptions &LangOpts,
3791	NamedDecl *D) {
3792	if (!LangOpts.Modules || !D->isFromASTFile())
3793	return D;
3794
3795	if (Decl *Redecl = D->getPreviousDecl()) {
3796	// For Redeclarable decls, a prior declaration might be local.
3797	for (; Redecl; Redecl = Redecl->getPreviousDecl()) {
3798	// If we find a local decl, we're done.
3799	if (!Redecl->isFromASTFile()) {
3800	// Exception: in very rare cases (for injected-class-names), not all
3801	// redeclarations are in the same semantic context. Skip ones in a
3802	// different context. They don't go in this lookup table at all.
3803	if (!Redecl->getDeclContext()->getRedeclContext()->Equals(
3804	DC: D->getDeclContext()->getRedeclContext()))
3805	continue;
3806	return cast<NamedDecl>(Val: Redecl);
3807	}
3808
3809	// If we find a decl from a (chained-)PCH stop since we won't find a
3810	// local one.
3811	if (Redecl->getOwningModuleID() == 0)
3812	break;
3813	}
3814	} else if (Decl *First = D->getCanonicalDecl()) {
3815	// For Mergeable decls, the first decl might be local.
3816	if (!First->isFromASTFile())
3817	return cast<NamedDecl>(Val: First);
3818	}
3819
3820	// All declarations are imported. Our most recent declaration will also be
3821	// the most recent one in anyone who imports us.
3822	return D;
3823	}
3824
3825	namespace {
3826
3827	bool IsInterestingIdentifier(const IdentifierInfo *II, uint64_t MacroOffset,
3828	bool IsModule, bool IsCPlusPlus) {
3829	bool NeedDecls = !IsModule || !IsCPlusPlus;
3830
3831	bool IsInteresting =
3832	II->getNotableIdentifierID() != tok::NotableIdentifierKind::not_notable ||
3833	II->getBuiltinID() != Builtin::ID::NotBuiltin ||
3834	II->getObjCKeywordID() != tok::ObjCKeywordKind::objc_not_keyword;
3835	if (MacroOffset ||
3836	(II->hasMacroDefinition() &&
3837	II->hasFETokenInfoChangedSinceDeserialization()) ||
3838	II->isPoisoned() || (!IsModule && IsInteresting) ||
3839	II->hasRevertedTokenIDToIdentifier() ||
3840	(NeedDecls && II->getFETokenInfo()))
3841	return true;
3842
3843	return false;
3844	}
3845
3846	bool IsInterestingNonMacroIdentifier(const IdentifierInfo *II,
3847	ASTWriter &Writer) {
3848	bool IsModule = Writer.isWritingModule();
3849	bool IsCPlusPlus = Writer.getLangOpts().CPlusPlus;
3850	return IsInterestingIdentifier(II, /*MacroOffset=*/0, IsModule, IsCPlusPlus);
3851	}
3852
3853	class ASTIdentifierTableTrait {
3854	ASTWriter &Writer;
3855	Preprocessor &PP;
3856	IdentifierResolver *IdResolver;
3857	bool IsModule;
3858	bool NeedDecls;
3859	ASTWriter::RecordData *InterestingIdentifierOffsets;
3860
3861	/// Determines whether this is an "interesting" identifier that needs a
3862	/// full IdentifierInfo structure written into the hash table. Notably, this
3863	/// doesn't check whether the name has macros defined; use PublicMacroIterator
3864	/// to check that.
3865	bool isInterestingIdentifier(const IdentifierInfo *II, uint64_t MacroOffset) {
3866	return IsInterestingIdentifier(II, MacroOffset, IsModule,
3867	IsCPlusPlus: Writer.getLangOpts().CPlusPlus);
3868	}
3869
3870	public:
3871	using key_type = const IdentifierInfo *;
3872	using key_type_ref = key_type;
3873
3874	using data_type = IdentifierID;
3875	using data_type_ref = data_type;
3876
3877	using hash_value_type = unsigned;
3878	using offset_type = unsigned;
3879
3880	ASTIdentifierTableTrait(ASTWriter &Writer, Preprocessor &PP,
3881	IdentifierResolver *IdResolver, bool IsModule,
3882	ASTWriter::RecordData *InterestingIdentifierOffsets)
3883	: Writer(Writer), PP(PP), IdResolver(IdResolver), IsModule(IsModule),
3884	NeedDecls(!IsModule || !Writer.getLangOpts().CPlusPlus),
3885	InterestingIdentifierOffsets(InterestingIdentifierOffsets) {}
3886
3887	bool needDecls() const { return NeedDecls; }
3888
3889	static hash_value_type ComputeHash(const IdentifierInfo* II) {
3890	return llvm::djbHash(Buffer: II->getName());
3891	}
3892
3893	bool isInterestingIdentifier(const IdentifierInfo *II) {
3894	auto MacroOffset = Writer.getMacroDirectivesOffset(Name: II);
3895	return isInterestingIdentifier(II, MacroOffset);
3896	}
3897
3898	std::pair<unsigned, unsigned>
3899	EmitKeyDataLength(raw_ostream &Out, const IdentifierInfo *II, IdentifierID ID) {
3900	// Record the location of the identifier data. This is used when generating
3901	// the mapping from persistent IDs to strings.
3902	Writer.SetIdentifierOffset(II, Offset: Out.tell());
3903
3904	auto MacroOffset = Writer.getMacroDirectivesOffset(Name: II);
3905
3906	// Emit the offset of the key/data length information to the interesting
3907	// identifiers table if necessary.
3908	if (InterestingIdentifierOffsets &&
3909	isInterestingIdentifier(II, MacroOffset))
3910	InterestingIdentifierOffsets->push_back(Elt: Out.tell());
3911
3912	unsigned KeyLen = II->getLength() + 1;
3913	unsigned DataLen = sizeof(IdentifierID); // bytes for the persistent ID << 1
3914	if (isInterestingIdentifier(II, MacroOffset)) {
3915	DataLen += 2; // 2 bytes for builtin ID
3916	DataLen += 2; // 2 bytes for flags
3917	if (MacroOffset || (II->hasMacroDefinition() &&
3918	II->hasFETokenInfoChangedSinceDeserialization()))
3919	DataLen += 4; // MacroDirectives offset.
3920
3921	if (NeedDecls && IdResolver)
3922	DataLen += std::distance(first: IdResolver->begin(Name: II), last: IdResolver->end()) *
3923	sizeof(DeclID);
3924	}
3925	return emitULEBKeyDataLength(KeyLen, DataLen, Out);
3926	}
3927
3928	void EmitKey(raw_ostream &Out, const IdentifierInfo *II, unsigned KeyLen) {
3929	Out.write(Ptr: II->getNameStart(), Size: KeyLen);
3930	}
3931
3932	void EmitData(raw_ostream &Out, const IdentifierInfo *II, IdentifierID ID,
3933	unsigned) {
3934	using namespace llvm::support;
3935
3936	endian::Writer LE(Out, llvm::endianness::little);
3937
3938	auto MacroOffset = Writer.getMacroDirectivesOffset(Name: II);
3939	if (!isInterestingIdentifier(II, MacroOffset)) {
3940	LE.write<IdentifierID>(Val: ID << 1);
3941	return;
3942	}
3943
3944	LE.write<IdentifierID>(Val: (ID << 1) | 0x01);
3945	uint32_t Bits = (uint32_t)II->getObjCOrBuiltinID();
3946	assert((Bits & 0xffff) == Bits && "ObjCOrBuiltinID too big for ASTReader.");
3947	LE.write<uint16_t>(Val: Bits);
3948	Bits = 0;
3949	bool HasMacroDefinition =
3950	(MacroOffset != 0) || (II->hasMacroDefinition() &&
3951	II->hasFETokenInfoChangedSinceDeserialization());
3952	Bits = (Bits << 1) | unsigned(HasMacroDefinition);
3953	Bits = (Bits << 1) | unsigned(II->isExtensionToken());
3954	Bits = (Bits << 1) | unsigned(II->isPoisoned());
3955	Bits = (Bits << 1) | unsigned(II->hasRevertedTokenIDToIdentifier());
3956	Bits = (Bits << 1) | unsigned(II->isCPlusPlusOperatorKeyword());
3957	LE.write<uint16_t>(Val: Bits);
3958
3959	if (HasMacroDefinition)
3960	LE.write<uint32_t>(Val: MacroOffset);
3961
3962	if (NeedDecls && IdResolver) {
3963	// Emit the declaration IDs in reverse order, because the
3964	// IdentifierResolver provides the declarations as they would be
3965	// visible (e.g., the function "stat" would come before the struct
3966	// "stat"), but the ASTReader adds declarations to the end of the list
3967	// (so we need to see the struct "stat" before the function "stat").
3968	// Only emit declarations that aren't from a chained PCH, though.
3969	SmallVector<NamedDecl *, 16> Decls(IdResolver->decls(Name: II));
3970	for (NamedDecl *D : llvm::reverse(C&: Decls))
3971	LE.write<DeclID>(Val: (DeclID)Writer.getDeclID(
3972	getDeclForLocalLookup(LangOpts: PP.getLangOpts(), D)));
3973	}
3974	}
3975	};
3976
3977	} // namespace
3978
3979	/// If the \param IdentifierID ID is a local Identifier ID. If the higher
3980	/// bits of ID is 0, it implies that the ID doesn't come from AST files.
3981	static bool isLocalIdentifierID(IdentifierID ID) { return !(ID >> 32); }
3982
3983	/// Write the identifier table into the AST file.
3984	///
3985	/// The identifier table consists of a blob containing string data
3986	/// (the actual identifiers themselves) and a separate "offsets" index
3987	/// that maps identifier IDs to locations within the blob.
3988	void ASTWriter::WriteIdentifierTable(Preprocessor &PP,
3989	IdentifierResolver *IdResolver,
3990	bool IsModule) {
3991	using namespace llvm;
3992
3993	RecordData InterestingIdents;
3994
3995	// Create and write out the blob that contains the identifier
3996	// strings.
3997	{
3998	llvm::OnDiskChainedHashTableGenerator<ASTIdentifierTableTrait> Generator;
3999	ASTIdentifierTableTrait Trait(*this, PP, IdResolver, IsModule,
4000	IsModule ? &InterestingIdents : nullptr);
4001
4002	// Create the on-disk hash table representation. We only store offsets
4003	// for identifiers that appear here for the first time.
4004	IdentifierOffsets.resize(new_size: NextIdentID - FirstIdentID);
4005	for (auto IdentIDPair : IdentifierIDs) {
4006	const IdentifierInfo *II = IdentIDPair.first;
4007	IdentifierID ID = IdentIDPair.second;
4008	assert(II && "NULL identifier in identifier table");
4009
4010	// Write out identifiers if either the ID is local or the identifier has
4011	// changed since it was loaded.
4012	if (isLocalIdentifierID(ID) || II->hasChangedSinceDeserialization() ||
4013	(Trait.needDecls() &&
4014	II->hasFETokenInfoChangedSinceDeserialization()))
4015	Generator.insert(Key: II, Data: ID, InfoObj&: Trait);
4016	}
4017
4018	// Create the on-disk hash table in a buffer.
4019	SmallString<4096> IdentifierTable;
4020	uint32_t BucketOffset;
4021	{
4022	using namespace llvm::support;
4023
4024	llvm::raw_svector_ostream Out(IdentifierTable);
4025	// Make sure that no bucket is at offset 0
4026	endian::write<uint32_t>(os&: Out, value: 0, endian: llvm::endianness::little);
4027	BucketOffset = Generator.Emit(Out, InfoObj&: Trait);
4028	}
4029
4030	// Create a blob abbreviation
4031	auto Abbrev = std::make_shared<BitCodeAbbrev>();
4032	Abbrev->Add(OpInfo: BitCodeAbbrevOp(IDENTIFIER_TABLE));
4033	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
4034	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
4035	unsigned IDTableAbbrev = Stream.EmitAbbrev(Abbv: std::move(Abbrev));
4036
4037	// Write the identifier table
4038	RecordData::value_type Record[] = {IDENTIFIER_TABLE, BucketOffset};
4039	Stream.EmitRecordWithBlob(Abbrev: IDTableAbbrev, Vals: Record, Blob: IdentifierTable);
4040	}
4041
4042	// Write the offsets table for identifier IDs.
4043	auto Abbrev = std::make_shared<BitCodeAbbrev>();
4044	Abbrev->Add(OpInfo: BitCodeAbbrevOp(IDENTIFIER_OFFSET));
4045	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // # of identifiers
4046	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
4047	unsigned IdentifierOffsetAbbrev = Stream.EmitAbbrev(Abbv: std::move(Abbrev));
4048
4049	#ifndef NDEBUG
4050	for (unsigned I = 0, N = IdentifierOffsets.size(); I != N; ++I)
4051	assert(IdentifierOffsets[I] && "Missing identifier offset?");
4052	#endif
4053
4054	RecordData::value_type Record[] = {IDENTIFIER_OFFSET,
4055	IdentifierOffsets.size()};
4056	Stream.EmitRecordWithBlob(Abbrev: IdentifierOffsetAbbrev, Vals: Record,
4057	Blob: bytes(v: IdentifierOffsets));
4058
4059	// In C++, write the list of interesting identifiers (those that are
4060	// defined as macros, poisoned, or similar unusual things).
4061	if (!InterestingIdents.empty())
4062	Stream.EmitRecord(Code: INTERESTING_IDENTIFIERS, Vals: InterestingIdents);
4063	}
4064
4065	void ASTWriter::handleVTable(CXXRecordDecl *RD) {
4066	if (!RD->isInNamedModule())
4067	return;
4068
4069	PendingEmittingVTables.push_back(Elt: RD);
4070	}
4071
4072	//===----------------------------------------------------------------------===//
4073	// DeclContext's Name Lookup Table Serialization
4074	//===----------------------------------------------------------------------===//
4075
4076	namespace {
4077
4078	class ASTDeclContextNameLookupTraitBase {
4079	protected:
4080	ASTWriter &Writer;
4081	using DeclIDsTy = llvm::SmallVector<LocalDeclID, 64>;
4082	DeclIDsTy DeclIDs;
4083
4084	public:
4085	/// A start and end index into DeclIDs, representing a sequence of decls.
4086	using data_type = std::pair<unsigned, unsigned>;
4087	using data_type_ref = const data_type &;
4088
4089	using hash_value_type = unsigned;
4090	using offset_type = unsigned;
4091
4092	protected:
4093	explicit ASTDeclContextNameLookupTraitBase(ASTWriter &Writer)
4094	: Writer(Writer) {}
4095
4096	public:
4097	data_type getData(const DeclIDsTy &LocalIDs) {
4098	unsigned Start = DeclIDs.size();
4099	for (auto ID : LocalIDs)
4100	DeclIDs.push_back(Elt: ID);
4101	return std::make_pair(x&: Start, y: DeclIDs.size());
4102	}
4103
4104	data_type ImportData(const reader::ASTDeclContextNameLookupTrait::data_type &FromReader) {
4105	unsigned Start = DeclIDs.size();
4106	DeclIDs.insert(
4107	DeclIDs.end(),
4108	DeclIDIterator<GlobalDeclID, LocalDeclID>(FromReader.begin()),
4109	DeclIDIterator<GlobalDeclID, LocalDeclID>(FromReader.end()));
4110	return std::make_pair(x&: Start, y: DeclIDs.size());
4111	}
4112
4113	void EmitFileRef(raw_ostream &Out, ModuleFile *F) const {
4114	assert(Writer.hasChain() &&
4115	"have reference to loaded module file but no chain?");
4116
4117	using namespace llvm::support;
4118
4119	endian::write<uint32_t>(os&: Out, value: Writer.getChain()->getModuleFileID(M: F),
4120	endian: llvm::endianness::little);
4121	}
4122
4123	std::pair<unsigned, unsigned> EmitKeyDataLengthBase(raw_ostream &Out,
4124	DeclarationNameKey Name,
4125	data_type_ref Lookup) {
4126	unsigned KeyLen = 1;
4127	switch (Name.getKind()) {
4128	case DeclarationName::Identifier:
4129	case DeclarationName::CXXLiteralOperatorName:
4130	case DeclarationName::CXXDeductionGuideName:
4131	KeyLen += sizeof(IdentifierID);
4132	break;
4133	case DeclarationName::ObjCZeroArgSelector:
4134	case DeclarationName::ObjCOneArgSelector:
4135	case DeclarationName::ObjCMultiArgSelector:
4136	KeyLen += 4;
4137	break;
4138	case DeclarationName::CXXOperatorName:
4139	KeyLen += 1;
4140	break;
4141	case DeclarationName::CXXConstructorName:
4142	case DeclarationName::CXXDestructorName:
4143	case DeclarationName::CXXConversionFunctionName:
4144	case DeclarationName::CXXUsingDirective:
4145	break;
4146	}
4147
4148	// length of DeclIDs.
4149	unsigned DataLen = sizeof(DeclID) * (Lookup.second - Lookup.first);
4150
4151	return {KeyLen, DataLen};
4152	}
4153
4154	void EmitKeyBase(raw_ostream &Out, DeclarationNameKey Name) {
4155	using namespace llvm::support;
4156
4157	endian::Writer LE(Out, llvm::endianness::little);
4158	LE.write<uint8_t>(Val: Name.getKind());
4159	switch (Name.getKind()) {
4160	case DeclarationName::Identifier:
4161	case DeclarationName::CXXLiteralOperatorName:
4162	case DeclarationName::CXXDeductionGuideName:
4163	LE.write<IdentifierID>(Val: Writer.getIdentifierRef(II: Name.getIdentifier()));
4164	return;
4165	case DeclarationName::ObjCZeroArgSelector:
4166	case DeclarationName::ObjCOneArgSelector:
4167	case DeclarationName::ObjCMultiArgSelector:
4168	LE.write<uint32_t>(Val: Writer.getSelectorRef(Sel: Name.getSelector()));
4169	return;
4170	case DeclarationName::CXXOperatorName:
4171	assert(Name.getOperatorKind() < NUM_OVERLOADED_OPERATORS &&
4172	"Invalid operator?");
4173	LE.write<uint8_t>(Val: Name.getOperatorKind());
4174	return;
4175	case DeclarationName::CXXConstructorName:
4176	case DeclarationName::CXXDestructorName:
4177	case DeclarationName::CXXConversionFunctionName:
4178	case DeclarationName::CXXUsingDirective:
4179	return;
4180	}
4181
4182	llvm_unreachable("Invalid name kind?");
4183	}
4184
4185	void EmitDataBase(raw_ostream &Out, data_type Lookup, unsigned DataLen) {
4186	using namespace llvm::support;
4187
4188	endian::Writer LE(Out, llvm::endianness::little);
4189	uint64_t Start = Out.tell(); (void)Start;
4190	for (unsigned I = Lookup.first, N = Lookup.second; I != N; ++I)
4191	LE.write<DeclID>(Val: (DeclID)DeclIDs[I]);
4192	assert(Out.tell() - Start == DataLen && "Data length is wrong");
4193	}
4194	};
4195
4196	class ModuleLevelNameLookupTrait : public ASTDeclContextNameLookupTraitBase {
4197	public:
4198	using primary_module_hash_type = unsigned;
4199
4200	using key_type = std::pair<DeclarationNameKey, primary_module_hash_type>;
4201	using key_type_ref = key_type;
4202
4203	explicit ModuleLevelNameLookupTrait(ASTWriter &Writer)
4204	: ASTDeclContextNameLookupTraitBase(Writer) {}
4205
4206	static bool EqualKey(key_type_ref a, key_type_ref b) { return a == b; }
4207
4208	hash_value_type ComputeHash(key_type Key) {
4209	llvm::FoldingSetNodeID ID;
4210	ID.AddInteger(I: Key.first.getHash());
4211	ID.AddInteger(I: Key.second);
4212	return ID.computeStableHash();
4213	}
4214
4215	std::pair<unsigned, unsigned>
4216	EmitKeyDataLength(raw_ostream &Out, key_type Key, data_type_ref Lookup) {
4217	auto [KeyLen, DataLen] = EmitKeyDataLengthBase(Out, Name: Key.first, Lookup);
4218	KeyLen += sizeof(Key.second);
4219	return emitULEBKeyDataLength(KeyLen, DataLen, Out);
4220	}
4221
4222	void EmitKey(raw_ostream &Out, key_type Key, unsigned) {
4223	EmitKeyBase(Out, Name: Key.first);
4224	llvm::support::endian::Writer LE(Out, llvm::endianness::little);
4225	LE.write<primary_module_hash_type>(Val: Key.second);
4226	}
4227
4228	void EmitData(raw_ostream &Out, key_type_ref, data_type Lookup,
4229	unsigned DataLen) {
4230	EmitDataBase(Out, Lookup, DataLen);
4231	}
4232	};
4233
4234	static bool isModuleLocalDecl(NamedDecl *D) {
4235	// For decls not in a file context, they should have the same visibility
4236	// with their parent.
4237	if (auto *Parent = dyn_cast<NamedDecl>(D->getNonTransparentDeclContext());
4238	Parent && !D->getNonTransparentDeclContext()->isFileContext())
4239	return isModuleLocalDecl(Parent);
4240
4241	// Deduction Guide are special here. Since their logical parent context are
4242	// not their actual parent.
4243	if (auto *FTD = dyn_cast<FunctionTemplateDecl>(Val: D))
4244	if (auto *CDGD = dyn_cast<CXXDeductionGuideDecl>(Val: FTD->getTemplatedDecl()))
4245	return isModuleLocalDecl(CDGD->getDeducedTemplate());
4246
4247	if (D->getFormalLinkage() == Linkage::Module)
4248	return true;
4249
4250	return false;
4251	}
4252
4253	static bool isTULocalInNamedModules(NamedDecl *D) {
4254	Module *NamedModule = D->getTopLevelOwningNamedModule();
4255	if (!NamedModule)
4256	return false;
4257
4258	// For none-top level decls, we choose to move it to the general visible
4259	// lookup table. Since the consumer may get its parent somehow and performs
4260	// a lookup in it (considering looking up the operator function in lambda).
4261	// The difference between module local lookup table and TU local lookup table
4262	// is, the consumers still have a chance to lookup in the module local lookup
4263	// table but **now** the consumers won't read the TU local lookup table if
4264	// the consumer is not the original TU.
4265	//
4266	// FIXME: It seems to be an optimization chance (and also a more correct
4267	// semantics) to remain the TULocal lookup table and performing similar lookup
4268	// with the module local lookup table except that we only allow the lookups
4269	// with the same module unit.
4270	if (!D->getNonTransparentDeclContext()->isFileContext())
4271	return false;
4272
4273	return D->getLinkageInternal() == Linkage::Internal;
4274	}
4275
4276	// Trait used for the on-disk hash table used in the method pool.
4277	template <bool CollectingTULocalDecls>
4278	class ASTDeclContextNameLookupTrait : public ASTDeclContextNameLookupTraitBase {
4279	public:
4280	using ModuleLevelDeclsMapTy =
4281	llvm::DenseMap<ModuleLevelNameLookupTrait::key_type, DeclIDsTy>;
4282
4283	using key_type = DeclarationNameKey;
4284	using key_type_ref = key_type;
4285
4286	using TULocalDeclsMapTy = llvm::DenseMap<key_type, DeclIDsTy>;
4287
4288	private:
4289	ModuleLevelDeclsMapTy ModuleLocalDeclsMap;
4290	TULocalDeclsMapTy TULocalDeclsMap;
4291
4292	public:
4293	explicit ASTDeclContextNameLookupTrait(ASTWriter &Writer)
4294	: ASTDeclContextNameLookupTraitBase(Writer) {}
4295
4296	template <typename Coll> data_type getData(const Coll &Decls) {
4297	unsigned Start = DeclIDs.size();
4298	for (NamedDecl *D : Decls) {
4299	NamedDecl *DeclForLocalLookup =
4300	getDeclForLocalLookup(Writer.getLangOpts(), D);
4301
4302	if (Writer.getDoneWritingDeclsAndTypes() &&
4303	!Writer.wasDeclEmitted(D: DeclForLocalLookup))
4304	continue;
4305
4306	// Try to avoid writing internal decls to reduced BMI.
4307	// See comments in ASTWriter::WriteDeclContextLexicalBlock for details.
4308	if (Writer.isGeneratingReducedBMI() &&
4309	!DeclForLocalLookup->isFromExplicitGlobalModule() &&
4310	IsInternalDeclFromFileContext(DeclForLocalLookup))
4311	continue;
4312
4313	auto ID = Writer.GetDeclRef(D: DeclForLocalLookup);
4314
4315	if (isModuleLocalDecl(D)) {
4316	if (UnsignedOrNone PrimaryModuleHash =
4317	getPrimaryModuleHash(D->getOwningModule())) {
4318	auto Key = std::make_pair(x: D->getDeclName(), y: *PrimaryModuleHash);
4319	auto Iter = ModuleLocalDeclsMap.find(Key);
4320	if (Iter == ModuleLocalDeclsMap.end())
4321	ModuleLocalDeclsMap.insert({Key, DeclIDsTy{ID}});
4322	else
4323	Iter->second.push_back(ID);
4324	continue;
4325	}
4326	}
4327
4328	if constexpr (CollectingTULocalDecls) {
4329	if (isTULocalInNamedModules(D)) {
4330	auto Iter = TULocalDeclsMap.find(Val: D->getDeclName());
4331	if (Iter == TULocalDeclsMap.end())
4332	TULocalDeclsMap.insert(KV: {D->getDeclName(), DeclIDsTy{ID}});
4333	else
4334	Iter->second.push_back(Elt: ID);
4335	continue;
4336	}
4337	}
4338
4339	DeclIDs.push_back(Elt: ID);
4340	}
4341	return std::make_pair(Start, DeclIDs.size());
4342	}
4343
4344	using ASTDeclContextNameLookupTraitBase::getData;
4345
4346	const ModuleLevelDeclsMapTy &getModuleLocalDecls() {
4347	return ModuleLocalDeclsMap;
4348	}
4349
4350	const TULocalDeclsMapTy &getTULocalDecls() { return TULocalDeclsMap; }
4351
4352	static bool EqualKey(key_type_ref a, key_type_ref b) { return a == b; }
4353
4354	hash_value_type ComputeHash(key_type Name) { return Name.getHash(); }
4355
4356	std::pair<unsigned, unsigned> EmitKeyDataLength(raw_ostream &Out,
4357	DeclarationNameKey Name,
4358	data_type_ref Lookup) {
4359	auto [KeyLen, DataLen] = EmitKeyDataLengthBase(Out, Name, Lookup);
4360	return emitULEBKeyDataLength(KeyLen, DataLen, Out);
4361	}
4362
4363	void EmitKey(raw_ostream &Out, DeclarationNameKey Name, unsigned) {
4364	return EmitKeyBase(Out, Name);
4365	}
4366
4367	void EmitData(raw_ostream &Out, key_type_ref, data_type Lookup,
4368	unsigned DataLen) {
4369	EmitDataBase(Out, Lookup, DataLen);
4370	}
4371	};
4372
4373	} // namespace
4374
4375	namespace {
4376	class LazySpecializationInfoLookupTrait {
4377	ASTWriter &Writer;
4378	llvm::SmallVector<serialization::reader::LazySpecializationInfo, 64> Specs;
4379
4380	public:
4381	using key_type = unsigned;
4382	using key_type_ref = key_type;
4383
4384	/// A start and end index into Specs, representing a sequence of decls.
4385	using data_type = std::pair<unsigned, unsigned>;
4386	using data_type_ref = const data_type &;
4387
4388	using hash_value_type = unsigned;
4389	using offset_type = unsigned;
4390
4391	explicit LazySpecializationInfoLookupTrait(ASTWriter &Writer)
4392	: Writer(Writer) {}
4393
4394	template <typename Col, typename Col2>
4395	data_type getData(Col &&C, Col2 &ExistingInfo) {
4396	unsigned Start = Specs.size();
4397	for (auto *D : C) {
4398	NamedDecl *ND = getDeclForLocalLookup(LangOpts: Writer.getLangOpts(),
4399	D: const_cast<NamedDecl *>(D));
4400	Specs.push_back(Elt: GlobalDeclID(Writer.GetDeclRef(ND).getRawValue()));
4401	}
4402	for (const serialization::reader::LazySpecializationInfo &Info :
4403	ExistingInfo)
4404	Specs.push_back(Elt: Info);
4405	return std::make_pair(x&: Start, y: Specs.size());
4406	}
4407
4408	data_type ImportData(
4409	const reader::LazySpecializationInfoLookupTrait::data_type &FromReader) {
4410	unsigned Start = Specs.size();
4411	for (auto ID : FromReader)
4412	Specs.push_back(Elt: ID);
4413	return std::make_pair(x&: Start, y: Specs.size());
4414	}
4415
4416	static bool EqualKey(key_type_ref a, key_type_ref b) { return a == b; }
4417
4418	hash_value_type ComputeHash(key_type Name) { return Name; }
4419
4420	void EmitFileRef(raw_ostream &Out, ModuleFile *F) const {
4421	assert(Writer.hasChain() &&
4422	"have reference to loaded module file but no chain?");
4423
4424	using namespace llvm::support;
4425	endian::write<uint32_t>(os&: Out, value: Writer.getChain()->getModuleFileID(M: F),
4426	endian: llvm::endianness::little);
4427	}
4428
4429	std::pair<unsigned, unsigned> EmitKeyDataLength(raw_ostream &Out,
4430	key_type HashValue,
4431	data_type_ref Lookup) {
4432	// 4 bytes for each slot.
4433	unsigned KeyLen = 4;
4434	unsigned DataLen = sizeof(serialization::reader::LazySpecializationInfo) *
4435	(Lookup.second - Lookup.first);
4436
4437	return emitULEBKeyDataLength(KeyLen, DataLen, Out);
4438	}
4439
4440	void EmitKey(raw_ostream &Out, key_type HashValue, unsigned) {
4441	using namespace llvm::support;
4442
4443	endian::Writer LE(Out, llvm::endianness::little);
4444	LE.write<uint32_t>(Val: HashValue);
4445	}
4446
4447	void EmitData(raw_ostream &Out, key_type_ref, data_type Lookup,
4448	unsigned DataLen) {
4449	using namespace llvm::support;
4450
4451	endian::Writer LE(Out, llvm::endianness::little);
4452	uint64_t Start = Out.tell();
4453	(void)Start;
4454	for (unsigned I = Lookup.first, N = Lookup.second; I != N; ++I) {
4455	LE.write<DeclID>(Val: Specs[I].getRawValue());
4456	}
4457	assert(Out.tell() - Start == DataLen && "Data length is wrong");
4458	}
4459	};
4460
4461	unsigned CalculateODRHashForSpecs(const Decl *Spec) {
4462	ArrayRef<TemplateArgument> Args;
4463	if (auto *CTSD = dyn_cast<ClassTemplateSpecializationDecl>(Val: Spec))
4464	Args = CTSD->getTemplateArgs().asArray();
4465	else if (auto *VTSD = dyn_cast<VarTemplateSpecializationDecl>(Val: Spec))
4466	Args = VTSD->getTemplateArgs().asArray();
4467	else if (auto *FD = dyn_cast<FunctionDecl>(Val: Spec))
4468	Args = FD->getTemplateSpecializationArgs()->asArray();
4469	else
4470	llvm_unreachable("New Specialization Kind?");
4471
4472	return StableHashForTemplateArguments(Args);
4473	}
4474	} // namespace
4475
4476	void ASTWriter::GenerateSpecializationInfoLookupTable(
4477	const NamedDecl *D, llvm::SmallVectorImpl<const Decl *> &Specializations,
4478	llvm::SmallVectorImpl<char> &LookupTable, bool IsPartial) {
4479	assert(D->isFirstDecl());
4480
4481	// Create the on-disk hash table representation.
4482	MultiOnDiskHashTableGenerator<reader::LazySpecializationInfoLookupTrait,
4483	LazySpecializationInfoLookupTrait>
4484	Generator;
4485	LazySpecializationInfoLookupTrait Trait(*this);
4486
4487	llvm::MapVector<unsigned, llvm::SmallVector<const NamedDecl *, 4>>
4488	SpecializationMaps;
4489
4490	for (auto *Specialization : Specializations) {
4491	unsigned HashedValue = CalculateODRHashForSpecs(Spec: Specialization);
4492
4493	auto Iter = SpecializationMaps.find(Key: HashedValue);
4494	if (Iter == SpecializationMaps.end())
4495	Iter = SpecializationMaps
4496	.try_emplace(Key: HashedValue,
4497	Args: llvm::SmallVector<const NamedDecl *, 4>())
4498	.first;
4499
4500	Iter->second.push_back(Elt: cast<NamedDecl>(Val: Specialization));
4501	}
4502
4503	auto *Lookups =
4504	Chain ? Chain->getLoadedSpecializationsLookupTables(D, IsPartial)
4505	: nullptr;
4506
4507	for (auto &[HashValue, Specs] : SpecializationMaps) {
4508	SmallVector<serialization::reader::LazySpecializationInfo, 16>
4509	ExisitingSpecs;
4510	// We have to merge the lookup table manually here. We can't depend on the
4511	// merge mechanism offered by
4512	// clang::serialization::MultiOnDiskHashTableGenerator since that generator
4513	// assumes the we'll get the same value with the same key.
4514	// And also underlying llvm::OnDiskChainedHashTableGenerator assumes that we
4515	// won't insert the values with the same key twice. So we have to merge the
4516	// lookup table here manually.
4517	if (Lookups)
4518	ExisitingSpecs = Lookups->Table.find(HashValue);
4519
4520	Generator.insert(Key: HashValue, Data: Trait.getData(C&: Specs, ExistingInfo&: ExisitingSpecs), Info&: Trait);
4521	}
4522
4523	Generator.emit(Out&: LookupTable, Info&: Trait, Base: Lookups ? &Lookups->Table : nullptr);
4524	}
4525
4526	uint64_t ASTWriter::WriteSpecializationInfoLookupTable(
4527	const NamedDecl *D, llvm::SmallVectorImpl<const Decl *> &Specializations,
4528	bool IsPartial) {
4529
4530	llvm::SmallString<4096> LookupTable;
4531	GenerateSpecializationInfoLookupTable(D, Specializations, LookupTable,
4532	IsPartial);
4533
4534	uint64_t Offset = Stream.GetCurrentBitNo();
4535	RecordData::value_type Record[] = {static_cast<RecordData::value_type>(
4536	IsPartial ? DECL_PARTIAL_SPECIALIZATIONS : DECL_SPECIALIZATIONS)};
4537	Stream.EmitRecordWithBlob(Abbrev: IsPartial ? DeclPartialSpecializationsAbbrev
4538	: DeclSpecializationsAbbrev,
4539	Vals: Record, Blob: LookupTable);
4540
4541	return Offset;
4542	}
4543
4544	/// Returns ture if all of the lookup result are either external, not emitted or
4545	/// predefined. In such cases, the lookup result is not interesting and we don't
4546	/// need to record the result in the current being written module. Return false
4547	/// otherwise.
4548	static bool isLookupResultNotInteresting(ASTWriter &Writer,
4549	StoredDeclsList &Result) {
4550	for (auto *D : Result.getLookupResult()) {
4551	auto *LocalD = getDeclForLocalLookup(LangOpts: Writer.getLangOpts(), D);
4552	if (LocalD->isFromASTFile())
4553	continue;
4554
4555	// We can only be sure whether the local declaration is reachable
4556	// after we done writing the declarations and types.
4557	if (Writer.getDoneWritingDeclsAndTypes() && !Writer.wasDeclEmitted(LocalD))
4558	continue;
4559
4560	// We don't need to emit the predefined decls.
4561	if (Writer.isDeclPredefined(LocalD))
4562	continue;
4563
4564	return false;
4565	}
4566
4567	return true;
4568	}
4569
4570	void ASTWriter::GenerateNameLookupTable(
4571	ASTContext &Context, const DeclContext *ConstDC,
4572	llvm::SmallVectorImpl<char> &LookupTable,
4573	llvm::SmallVectorImpl<char> &ModuleLocalLookupTable,
4574	llvm::SmallVectorImpl<char> &TULookupTable) {
4575	assert(!ConstDC->hasLazyLocalLexicalLookups() &&
4576	!ConstDC->hasLazyExternalLexicalLookups() &&
4577	"must call buildLookups first");
4578
4579	// FIXME: We need to build the lookups table, which is logically const.
4580	auto *DC = const_cast<DeclContext*>(ConstDC);
4581	assert(DC == DC->getPrimaryContext() && "only primary DC has lookup table");
4582
4583	// Create the on-disk hash table representation.
4584	MultiOnDiskHashTableGenerator<
4585	reader::ASTDeclContextNameLookupTrait,
4586	ASTDeclContextNameLookupTrait</*CollectingTULocal=*/true>>
4587	Generator;
4588	ASTDeclContextNameLookupTrait</*CollectingTULocal=*/true> Trait(*this);
4589
4590	// The first step is to collect the declaration names which we need to
4591	// serialize into the name lookup table, and to collect them in a stable
4592	// order.
4593	SmallVector<DeclarationName, 16> Names;
4594
4595	// We also track whether we're writing out the DeclarationNameKey for
4596	// constructors or conversion functions.
4597	bool IncludeConstructorNames = false;
4598	bool IncludeConversionNames = false;
4599
4600	for (auto &[Name, Result] : *DC->buildLookup()) {
4601	// If there are no local declarations in our lookup result, we
4602	// don't need to write an entry for the name at all. If we can't
4603	// write out a lookup set without performing more deserialization,
4604	// just skip this entry.
4605	//
4606	// Also in reduced BMI, we'd like to avoid writing unreachable
4607	// declarations in GMF, so we need to avoid writing declarations
4608	// that entirely external or unreachable.
4609	if (GeneratingReducedBMI && isLookupResultNotInteresting(Writer&: *this, Result))
4610	continue;
4611	// We also skip empty results. If any of the results could be external and
4612	// the currently available results are empty, then all of the results are
4613	// external and we skip it above. So the only way we get here with an empty
4614	// results is when no results could have been external *and* we have
4615	// external results.
4616	//
4617	// FIXME: While we might want to start emitting on-disk entries for negative
4618	// lookups into a decl context as an optimization, today we *have* to skip
4619	// them because there are names with empty lookup results in decl contexts
4620	// which we can't emit in any stable ordering: we lookup constructors and
4621	// conversion functions in the enclosing namespace scope creating empty
4622	// results for them. This in almost certainly a bug in Clang's name lookup,
4623	// but that is likely to be hard or impossible to fix and so we tolerate it
4624	// here by omitting lookups with empty results.
4625	if (Result.getLookupResult().empty())
4626	continue;
4627
4628	switch (Name.getNameKind()) {
4629	default:
4630	Names.push_back(Elt: Name);
4631	break;
4632
4633	case DeclarationName::CXXConstructorName:
4634	IncludeConstructorNames = true;
4635	break;
4636
4637	case DeclarationName::CXXConversionFunctionName:
4638	IncludeConversionNames = true;
4639	break;
4640	}
4641	}
4642
4643	// Sort the names into a stable order.
4644	llvm::sort(C&: Names);
4645
4646	if (IncludeConstructorNames || IncludeConversionNames) {
4647	// We need to establish an ordering of constructor and conversion function
4648	// names, and they don't have an intrinsic ordering. We also need to write
4649	// out all constructor and conversion function results if we write out any
4650	// of them, because they're all tracked under the same lookup key.
4651	llvm::SmallPtrSet<DeclarationName, 8> AddedNames;
4652	for (Decl *ChildD : cast<CXXRecordDecl>(DC)->decls()) {
4653	if (auto *ChildND = dyn_cast<NamedDecl>(ChildD)) {
4654	auto Name = ChildND->getDeclName();
4655	switch (Name.getNameKind()) {
4656	default:
4657	continue;
4658
4659	case DeclarationName::CXXConstructorName:
4660	if (!IncludeConstructorNames)
4661	continue;
4662	break;
4663
4664	case DeclarationName::CXXConversionFunctionName:
4665	if (!IncludeConversionNames)
4666	continue;
4667	break;
4668	}
4669	if (AddedNames.insert(Name).second)
4670	Names.push_back(Name);
4671	}
4672	}
4673	}
4674	// Next we need to do a lookup with each name into this decl context to fully
4675	// populate any results from external sources. We don't actually use the
4676	// results of these lookups because we only want to use the results after all
4677	// results have been loaded and the pointers into them will be stable.
4678	for (auto &Name : Names)
4679	DC->lookup(Name);
4680
4681	// Now we need to insert the results for each name into the hash table. For
4682	// constructor names and conversion function names, we actually need to merge
4683	// all of the results for them into one list of results each and insert
4684	// those.
4685	SmallVector<NamedDecl *, 8> ConstructorDecls;
4686	SmallVector<NamedDecl *, 8> ConversionDecls;
4687
4688	// Now loop over the names, either inserting them or appending for the two
4689	// special cases.
4690	for (auto &Name : Names) {
4691	DeclContext::lookup_result Result = DC->noload_lookup(Name);
4692
4693	switch (Name.getNameKind()) {
4694	default:
4695	Generator.insert(Key: Name, Data: Trait.getData(Decls: Result), Info&: Trait);
4696	break;
4697
4698	case DeclarationName::CXXConstructorName:
4699	ConstructorDecls.append(in_start: Result.begin(), in_end: Result.end());
4700	break;
4701
4702	case DeclarationName::CXXConversionFunctionName:
4703	ConversionDecls.append(in_start: Result.begin(), in_end: Result.end());
4704	break;
4705	}
4706	}
4707
4708	// Handle our two special cases if we ended up having any. We arbitrarily use
4709	// the first declaration's name here because the name itself isn't part of
4710	// the key, only the kind of name is used.
4711	if (!ConstructorDecls.empty())
4712	Generator.insert(Key: ConstructorDecls.front()->getDeclName(),
4713	Data: Trait.getData(Decls: ConstructorDecls), Info&: Trait);
4714	if (!ConversionDecls.empty())
4715	Generator.insert(Key: ConversionDecls.front()->getDeclName(),
4716	Data: Trait.getData(Decls: ConversionDecls), Info&: Trait);
4717
4718	// Create the on-disk hash table. Also emit the existing imported and
4719	// merged table if there is one.
4720	auto *Lookups = Chain ? Chain->getLoadedLookupTables(Primary: DC) : nullptr;
4721	Generator.emit(Out&: LookupTable, Info&: Trait, Base: Lookups ? &Lookups->Table : nullptr);
4722
4723	const auto &ModuleLocalDecls = Trait.getModuleLocalDecls();
4724	if (!ModuleLocalDecls.empty()) {
4725	MultiOnDiskHashTableGenerator<reader::ModuleLocalNameLookupTrait,
4726	ModuleLevelNameLookupTrait>
4727	ModuleLocalLookupGenerator;
4728	ModuleLevelNameLookupTrait ModuleLocalTrait(*this);
4729
4730	for (const auto &ModuleLocalIter : ModuleLocalDecls) {
4731	const auto &Key = ModuleLocalIter.first;
4732	const auto &IDs = ModuleLocalIter.second;
4733	ModuleLocalLookupGenerator.insert(Key, Data: ModuleLocalTrait.getData(LocalIDs: IDs),
4734	Info&: ModuleLocalTrait);
4735	}
4736
4737	auto *ModuleLocalLookups =
4738	Chain ? Chain->getModuleLocalLookupTables(Primary: DC) : nullptr;
4739	ModuleLocalLookupGenerator.emit(
4740	Out&: ModuleLocalLookupTable, Info&: ModuleLocalTrait,
4741	Base: ModuleLocalLookups ? &ModuleLocalLookups->Table : nullptr);
4742	}
4743
4744	const auto &TULocalDecls = Trait.getTULocalDecls();
4745	if (!TULocalDecls.empty() && !isGeneratingReducedBMI()) {
4746	MultiOnDiskHashTableGenerator<
4747	reader::ASTDeclContextNameLookupTrait,
4748	ASTDeclContextNameLookupTrait</*CollectingTULocal=*/false>>
4749	TULookupGenerator;
4750	ASTDeclContextNameLookupTrait</*CollectingTULocal=*/false> TULocalTrait(
4751	*this);
4752
4753	for (const auto &TULocalIter : TULocalDecls) {
4754	const auto &Key = TULocalIter.first;
4755	const auto &IDs = TULocalIter.second;
4756	TULookupGenerator.insert(Key, Data: TULocalTrait.getData(LocalIDs: IDs), Info&: TULocalTrait);
4757	}
4758
4759	auto *TULocalLookups = Chain ? Chain->getTULocalLookupTables(Primary: DC) : nullptr;
4760	TULookupGenerator.emit(Out&: TULookupTable, Info&: TULocalTrait,
4761	Base: TULocalLookups ? &TULocalLookups->Table : nullptr);
4762	}
4763	}
4764
4765	/// Write the block containing all of the declaration IDs
4766	/// visible from the given DeclContext.
4767	///
4768	/// \returns the offset of the DECL_CONTEXT_VISIBLE block within the
4769	/// bitstream, or 0 if no block was written.
4770	void ASTWriter::WriteDeclContextVisibleBlock(ASTContext &Context,
4771	DeclContext *DC,
4772	uint64_t &VisibleBlockOffset,
4773	uint64_t &ModuleLocalBlockOffset,
4774	uint64_t &TULocalBlockOffset) {
4775	assert(VisibleBlockOffset == 0);
4776	assert(ModuleLocalBlockOffset == 0);
4777	assert(TULocalBlockOffset == 0);
4778
4779	// If we imported a key declaration of this namespace, write the visible
4780	// lookup results as an update record for it rather than including them
4781	// on this declaration. We will only look at key declarations on reload.
4782	if (isa<NamespaceDecl>(Val: DC) && Chain &&
4783	Chain->getKeyDeclaration(D: cast<Decl>(Val: DC))->isFromASTFile()) {
4784	// Only do this once, for the first local declaration of the namespace.
4785	for (auto *Prev = cast<NamespaceDecl>(Val: DC)->getPreviousDecl(); Prev;
4786	Prev = Prev->getPreviousDecl())
4787	if (!Prev->isFromASTFile())
4788	return;
4789
4790	// Note that we need to emit an update record for the primary context.
4791	UpdatedDeclContexts.insert(X: DC->getPrimaryContext());
4792
4793	// Make sure all visible decls are written. They will be recorded later. We
4794	// do this using a side data structure so we can sort the names into
4795	// a deterministic order.
4796	StoredDeclsMap *Map = DC->getPrimaryContext()->buildLookup();
4797	SmallVector<std::pair<DeclarationName, DeclContext::lookup_result>, 16>
4798	LookupResults;
4799	if (Map) {
4800	LookupResults.reserve(N: Map->size());
4801	for (auto &Entry : *Map)
4802	LookupResults.push_back(
4803	Elt: std::make_pair(x&: Entry.first, y: Entry.second.getLookupResult()));
4804	}
4805
4806	llvm::sort(C&: LookupResults, Comp: llvm::less_first());
4807	for (auto &NameAndResult : LookupResults) {
4808	DeclarationName Name = NameAndResult.first;
4809	DeclContext::lookup_result Result = NameAndResult.second;
4810	if (Name.getNameKind() == DeclarationName::CXXConstructorName ||
4811	Name.getNameKind() == DeclarationName::CXXConversionFunctionName) {
4812	// We have to work around a name lookup bug here where negative lookup
4813	// results for these names get cached in namespace lookup tables (these
4814	// names should never be looked up in a namespace).
4815	assert(Result.empty() && "Cannot have a constructor or conversion "
4816	"function name in a namespace!");
4817	continue;
4818	}
4819
4820	for (NamedDecl *ND : Result) {
4821	if (ND->isFromASTFile())
4822	continue;
4823
4824	if (DoneWritingDeclsAndTypes && !wasDeclEmitted(ND))
4825	continue;
4826
4827	// We don't need to force emitting internal decls into reduced BMI.
4828	// See comments in ASTWriter::WriteDeclContextLexicalBlock for details.
4829	if (GeneratingReducedBMI && !ND->isFromExplicitGlobalModule() &&
4830	IsInternalDeclFromFileContext(ND))
4831	continue;
4832
4833	GetDeclRef(ND);
4834	}
4835	}
4836
4837	return;
4838	}
4839
4840	if (DC->getPrimaryContext() != DC)
4841	return;
4842
4843	// Skip contexts which don't support name lookup.
4844	if (!DC->isLookupContext())
4845	return;
4846
4847	// If not in C++, we perform name lookup for the translation unit via the
4848	// IdentifierInfo chains, don't bother to build a visible-declarations table.
4849	if (DC->isTranslationUnit() && !Context.getLangOpts().CPlusPlus)
4850	return;
4851
4852	// Serialize the contents of the mapping used for lookup. Note that,
4853	// although we have two very different code paths, the serialized
4854	// representation is the same for both cases: a declaration name,
4855	// followed by a size, followed by references to the visible
4856	// declarations that have that name.
4857	StoredDeclsMap *Map = DC->buildLookup();
4858	if (!Map || Map->empty())
4859	return;
4860
4861	VisibleBlockOffset = Stream.GetCurrentBitNo();
4862	// Create the on-disk hash table in a buffer.
4863	SmallString<4096> LookupTable;
4864	SmallString<4096> ModuleLocalLookupTable;
4865	SmallString<4096> TULookupTable;
4866	GenerateNameLookupTable(Context, ConstDC: DC, LookupTable, ModuleLocalLookupTable,
4867	TULookupTable);
4868
4869	// Write the lookup table
4870	RecordData::value_type Record[] = {DECL_CONTEXT_VISIBLE};
4871	Stream.EmitRecordWithBlob(Abbrev: DeclContextVisibleLookupAbbrev, Vals: Record,
4872	Blob: LookupTable);
4873	++NumVisibleDeclContexts;
4874
4875	if (!ModuleLocalLookupTable.empty()) {
4876	ModuleLocalBlockOffset = Stream.GetCurrentBitNo();
4877	assert(ModuleLocalBlockOffset > VisibleBlockOffset);
4878	// Write the lookup table
4879	RecordData::value_type ModuleLocalRecord[] = {
4880	DECL_CONTEXT_MODULE_LOCAL_VISIBLE};
4881	Stream.EmitRecordWithBlob(Abbrev: DeclModuleLocalVisibleLookupAbbrev,
4882	Vals: ModuleLocalRecord, Blob: ModuleLocalLookupTable);
4883	++NumModuleLocalDeclContexts;
4884	}
4885
4886	if (!TULookupTable.empty()) {
4887	TULocalBlockOffset = Stream.GetCurrentBitNo();
4888	// Write the lookup table
4889	RecordData::value_type TULocalDeclsRecord[] = {
4890	DECL_CONTEXT_TU_LOCAL_VISIBLE};
4891	Stream.EmitRecordWithBlob(Abbrev: DeclTULocalLookupAbbrev, Vals: TULocalDeclsRecord,
4892	Blob: TULookupTable);
4893	++NumTULocalDeclContexts;
4894	}
4895	}
4896
4897	/// Write an UPDATE_VISIBLE block for the given context.
4898	///
4899	/// UPDATE_VISIBLE blocks contain the declarations that are added to an existing
4900	/// DeclContext in a dependent AST file. As such, they only exist for the TU
4901	/// (in C++), for namespaces, and for classes with forward-declared unscoped
4902	/// enumeration members (in C++11).
4903	void ASTWriter::WriteDeclContextVisibleUpdate(ASTContext &Context,
4904	const DeclContext *DC) {
4905	StoredDeclsMap *Map = DC->getLookupPtr();
4906	if (!Map || Map->empty())
4907	return;
4908
4909	// Create the on-disk hash table in a buffer.
4910	SmallString<4096> LookupTable;
4911	SmallString<4096> ModuleLocalLookupTable;
4912	SmallString<4096> TULookupTable;
4913	GenerateNameLookupTable(Context, ConstDC: DC, LookupTable, ModuleLocalLookupTable,
4914	TULookupTable);
4915
4916	// If we're updating a namespace, select a key declaration as the key for the
4917	// update record; those are the only ones that will be checked on reload.
4918	if (isa<NamespaceDecl>(Val: DC))
4919	DC = cast<DeclContext>(Val: Chain->getKeyDeclaration(D: cast<Decl>(Val: DC)));
4920
4921	// Write the lookup table
4922	RecordData::value_type Record[] = {UPDATE_VISIBLE,
4923	getDeclID(D: cast<Decl>(Val: DC)).getRawValue()};
4924	Stream.EmitRecordWithBlob(Abbrev: UpdateVisibleAbbrev, Vals: Record, Blob: LookupTable);
4925
4926	if (!ModuleLocalLookupTable.empty()) {
4927	// Write the module local lookup table
4928	RecordData::value_type ModuleLocalRecord[] = {
4929	UPDATE_MODULE_LOCAL_VISIBLE, getDeclID(D: cast<Decl>(Val: DC)).getRawValue()};
4930	Stream.EmitRecordWithBlob(Abbrev: ModuleLocalUpdateVisibleAbbrev, Vals: ModuleLocalRecord,
4931	Blob: ModuleLocalLookupTable);
4932	}
4933
4934	if (!TULookupTable.empty()) {
4935	RecordData::value_type GMFRecord[] = {
4936	UPDATE_TU_LOCAL_VISIBLE, getDeclID(D: cast<Decl>(Val: DC)).getRawValue()};
4937	Stream.EmitRecordWithBlob(Abbrev: TULocalUpdateVisibleAbbrev, Vals: GMFRecord,
4938	Blob: TULookupTable);
4939	}
4940	}
4941
4942	/// Write an FP_PRAGMA_OPTIONS block for the given FPOptions.
4943	void ASTWriter::WriteFPPragmaOptions(const FPOptionsOverride &Opts) {
4944	RecordData::value_type Record[] = {Opts.getAsOpaqueInt()};
4945	Stream.EmitRecord(Code: FP_PRAGMA_OPTIONS, Vals: Record);
4946	}
4947
4948	/// Write an OPENCL_EXTENSIONS block for the given OpenCLOptions.
4949	void ASTWriter::WriteOpenCLExtensions(Sema &SemaRef) {
4950	if (!SemaRef.Context.getLangOpts().OpenCL)
4951	return;
4952
4953	const OpenCLOptions &Opts = SemaRef.getOpenCLOptions();
4954	RecordData Record;
4955	for (const auto &I:Opts.OptMap) {
4956	AddString(Str: I.getKey(), Record);
4957	auto V = I.getValue();
4958	Record.push_back(Elt: V.Supported ? 1 : 0);
4959	Record.push_back(Elt: V.Enabled ? 1 : 0);
4960	Record.push_back(Elt: V.WithPragma ? 1 : 0);
4961	Record.push_back(Elt: V.Avail);
4962	Record.push_back(Elt: V.Core);
4963	Record.push_back(Elt: V.Opt);
4964	}
4965	Stream.EmitRecord(Code: OPENCL_EXTENSIONS, Vals: Record);
4966	}
4967	void ASTWriter::WriteCUDAPragmas(Sema &SemaRef) {
4968	if (SemaRef.CUDA().ForceHostDeviceDepth > 0) {
4969	RecordData::value_type Record[] = {SemaRef.CUDA().ForceHostDeviceDepth};
4970	Stream.EmitRecord(Code: CUDA_PRAGMA_FORCE_HOST_DEVICE_DEPTH, Vals: Record);
4971	}
4972	}
4973
4974	void ASTWriter::WriteObjCCategories() {
4975	if (ObjCClassesWithCategories.empty())
4976	return;
4977
4978	SmallVector<ObjCCategoriesInfo, 2> CategoriesMap;
4979	RecordData Categories;
4980
4981	for (unsigned I = 0, N = ObjCClassesWithCategories.size(); I != N; ++I) {
4982	unsigned Size = 0;
4983	unsigned StartIndex = Categories.size();
4984
4985	ObjCInterfaceDecl *Class = ObjCClassesWithCategories[I];
4986
4987	// Allocate space for the size.
4988	Categories.push_back(Elt: 0);
4989
4990	// Add the categories.
4991	for (ObjCInterfaceDecl::known_categories_iterator
4992	Cat = Class->known_categories_begin(),
4993	CatEnd = Class->known_categories_end();
4994	Cat != CatEnd; ++Cat, ++Size) {
4995	assert(getDeclID(*Cat).isValid() && "Bogus category");
4996	AddDeclRef(*Cat, Categories);
4997	}
4998
4999	// Update the size.
5000	Categories[StartIndex] = Size;
5001
5002	// Record this interface -> category map.
5003	ObjCCategoriesInfo CatInfo = { getDeclID(Class), StartIndex };
5004	CategoriesMap.push_back(Elt: CatInfo);
5005	}
5006
5007	// Sort the categories map by the definition ID, since the reader will be
5008	// performing binary searches on this information.
5009	llvm::array_pod_sort(Start: CategoriesMap.begin(), End: CategoriesMap.end());
5010
5011	// Emit the categories map.
5012	using namespace llvm;
5013
5014	auto Abbrev = std::make_shared<BitCodeAbbrev>();
5015	Abbrev->Add(OpInfo: BitCodeAbbrevOp(OBJC_CATEGORIES_MAP));
5016	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // # of entries
5017	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
5018	unsigned AbbrevID = Stream.EmitAbbrev(Abbv: std::move(Abbrev));
5019
5020	RecordData::value_type Record[] = {OBJC_CATEGORIES_MAP, CategoriesMap.size()};
5021	Stream.EmitRecordWithBlob(Abbrev: AbbrevID, Vals: Record,
5022	BlobData: reinterpret_cast<char *>(CategoriesMap.data()),
5023	BlobLen: CategoriesMap.size() * sizeof(ObjCCategoriesInfo));
5024
5025	// Emit the category lists.
5026	Stream.EmitRecord(Code: OBJC_CATEGORIES, Vals: Categories);
5027	}
5028
5029	void ASTWriter::WriteLateParsedTemplates(Sema &SemaRef) {
5030	Sema::LateParsedTemplateMapT &LPTMap = SemaRef.LateParsedTemplateMap;
5031
5032	if (LPTMap.empty())
5033	return;
5034
5035	RecordData Record;
5036	for (auto &LPTMapEntry : LPTMap) {
5037	const FunctionDecl *FD = LPTMapEntry.first;
5038	LateParsedTemplate &LPT = *LPTMapEntry.second;
5039	AddDeclRef(FD, Record);
5040	AddDeclRef(D: LPT.D, Record);
5041	Record.push_back(Elt: LPT.FPO.getAsOpaqueInt());
5042	Record.push_back(Elt: LPT.Toks.size());
5043
5044	for (const auto &Tok : LPT.Toks) {
5045	AddToken(Tok, Record);
5046	}
5047	}
5048	Stream.EmitRecord(Code: LATE_PARSED_TEMPLATE, Vals: Record);
5049	}
5050
5051	/// Write the state of 'pragma clang optimize' at the end of the module.
5052	void ASTWriter::WriteOptimizePragmaOptions(Sema &SemaRef) {
5053	RecordData Record;
5054	SourceLocation PragmaLoc = SemaRef.getOptimizeOffPragmaLocation();
5055	AddSourceLocation(Loc: PragmaLoc, Record);
5056	Stream.EmitRecord(Code: OPTIMIZE_PRAGMA_OPTIONS, Vals: Record);
5057	}
5058
5059	/// Write the state of 'pragma ms_struct' at the end of the module.
5060	void ASTWriter::WriteMSStructPragmaOptions(Sema &SemaRef) {
5061	RecordData Record;
5062	Record.push_back(Elt: SemaRef.MSStructPragmaOn ? PMSST_ON : PMSST_OFF);
5063	Stream.EmitRecord(Code: MSSTRUCT_PRAGMA_OPTIONS, Vals: Record);
5064	}
5065
5066	/// Write the state of 'pragma pointers_to_members' at the end of the
5067	//module.
5068	void ASTWriter::WriteMSPointersToMembersPragmaOptions(Sema &SemaRef) {
5069	RecordData Record;
5070	Record.push_back(Elt: SemaRef.MSPointerToMemberRepresentationMethod);
5071	AddSourceLocation(Loc: SemaRef.ImplicitMSInheritanceAttrLoc, Record);
5072	Stream.EmitRecord(Code: POINTERS_TO_MEMBERS_PRAGMA_OPTIONS, Vals: Record);
5073	}
5074
5075	/// Write the state of 'pragma align/pack' at the end of the module.
5076	void ASTWriter::WritePackPragmaOptions(Sema &SemaRef) {
5077	// Don't serialize pragma align/pack state for modules, since it should only
5078	// take effect on a per-submodule basis.
5079	if (WritingModule)
5080	return;
5081
5082	RecordData Record;
5083	AddAlignPackInfo(Info: SemaRef.AlignPackStack.CurrentValue, Record);
5084	AddSourceLocation(Loc: SemaRef.AlignPackStack.CurrentPragmaLocation, Record);
5085	Record.push_back(Elt: SemaRef.AlignPackStack.Stack.size());
5086	for (const auto &StackEntry : SemaRef.AlignPackStack.Stack) {
5087	AddAlignPackInfo(Info: StackEntry.Value, Record);
5088	AddSourceLocation(Loc: StackEntry.PragmaLocation, Record);
5089	AddSourceLocation(Loc: StackEntry.PragmaPushLocation, Record);
5090	AddString(Str: StackEntry.StackSlotLabel, Record);
5091	}
5092	Stream.EmitRecord(Code: ALIGN_PACK_PRAGMA_OPTIONS, Vals: Record);
5093	}
5094
5095	/// Write the state of 'pragma float_control' at the end of the module.
5096	void ASTWriter::WriteFloatControlPragmaOptions(Sema &SemaRef) {
5097	// Don't serialize pragma float_control state for modules,
5098	// since it should only take effect on a per-submodule basis.
5099	if (WritingModule)
5100	return;
5101
5102	RecordData Record;
5103	Record.push_back(Elt: SemaRef.FpPragmaStack.CurrentValue.getAsOpaqueInt());
5104	AddSourceLocation(Loc: SemaRef.FpPragmaStack.CurrentPragmaLocation, Record);
5105	Record.push_back(Elt: SemaRef.FpPragmaStack.Stack.size());
5106	for (const auto &StackEntry : SemaRef.FpPragmaStack.Stack) {
5107	Record.push_back(Elt: StackEntry.Value.getAsOpaqueInt());
5108	AddSourceLocation(Loc: StackEntry.PragmaLocation, Record);
5109	AddSourceLocation(Loc: StackEntry.PragmaPushLocation, Record);
5110	AddString(Str: StackEntry.StackSlotLabel, Record);
5111	}
5112	Stream.EmitRecord(Code: FLOAT_CONTROL_PRAGMA_OPTIONS, Vals: Record);
5113	}
5114
5115	/// Write Sema's collected list of declarations with unverified effects.
5116	void ASTWriter::WriteDeclsWithEffectsToVerify(Sema &SemaRef) {
5117	if (SemaRef.DeclsWithEffectsToVerify.empty())
5118	return;
5119	RecordData Record;
5120	for (const auto *D : SemaRef.DeclsWithEffectsToVerify) {
5121	AddDeclRef(D, Record);
5122	}
5123	Stream.EmitRecord(Code: DECLS_WITH_EFFECTS_TO_VERIFY, Vals: Record);
5124	}
5125
5126	void ASTWriter::WriteModuleFileExtension(Sema &SemaRef,
5127	ModuleFileExtensionWriter &Writer) {
5128	// Enter the extension block.
5129	Stream.EnterSubblock(BlockID: EXTENSION_BLOCK_ID, CodeLen: 4);
5130
5131	// Emit the metadata record abbreviation.
5132	auto Abv = std::make_shared<llvm::BitCodeAbbrev>();
5133	Abv->Add(OpInfo: llvm::BitCodeAbbrevOp(EXTENSION_METADATA));
5134	Abv->Add(OpInfo: llvm::BitCodeAbbrevOp(llvm::BitCodeAbbrevOp::VBR, 6));
5135	Abv->Add(OpInfo: llvm::BitCodeAbbrevOp(llvm::BitCodeAbbrevOp::VBR, 6));
5136	Abv->Add(OpInfo: llvm::BitCodeAbbrevOp(llvm::BitCodeAbbrevOp::VBR, 6));
5137	Abv->Add(OpInfo: llvm::BitCodeAbbrevOp(llvm::BitCodeAbbrevOp::VBR, 6));
5138	Abv->Add(OpInfo: llvm::BitCodeAbbrevOp(llvm::BitCodeAbbrevOp::Blob));
5139	unsigned Abbrev = Stream.EmitAbbrev(Abbv: std::move(Abv));
5140
5141	// Emit the metadata record.
5142	RecordData Record;
5143	auto Metadata = Writer.getExtension()->getExtensionMetadata();
5144	Record.push_back(Elt: EXTENSION_METADATA);
5145	Record.push_back(Elt: Metadata.MajorVersion);
5146	Record.push_back(Elt: Metadata.MinorVersion);
5147	Record.push_back(Elt: Metadata.BlockName.size());
5148	Record.push_back(Elt: Metadata.UserInfo.size());
5149	SmallString<64> Buffer;
5150	Buffer += Metadata.BlockName;
5151	Buffer += Metadata.UserInfo;
5152	Stream.EmitRecordWithBlob(Abbrev, Vals: Record, Blob: Buffer);
5153
5154	// Emit the contents of the extension block.
5155	Writer.writeExtensionContents(SemaRef, Stream);
5156
5157	// Exit the extension block.
5158	Stream.ExitBlock();
5159	}
5160
5161	//===----------------------------------------------------------------------===//
5162	// General Serialization Routines
5163	//===----------------------------------------------------------------------===//
5164
5165	void ASTRecordWriter::AddAttr(const Attr *A) {
5166	auto &Record = *this;
5167	// FIXME: Clang can't handle the serialization/deserialization of
5168	// preferred_name properly now. See
5169	// https://github.com/llvm/llvm-project/issues/56490 for example.
5170	if (!A || (isa<PreferredNameAttr>(A) &&
5171	Writer->isWritingStdCXXNamedModules()))
5172	return Record.push_back(N: 0);
5173
5174	Record.push_back(N: A->getKind() + 1); // FIXME: stable encoding, target attrs
5175
5176	Record.AddIdentifierRef(II: A->getAttrName());
5177	Record.AddIdentifierRef(II: A->getScopeName());
5178	Record.AddSourceRange(Range: A->getRange());
5179	Record.AddSourceLocation(Loc: A->getScopeLoc());
5180	Record.push_back(N: A->getParsedKind());
5181	Record.push_back(N: A->getSyntax());
5182	Record.push_back(N: A->getAttributeSpellingListIndexRaw());
5183	Record.push_back(N: A->isRegularKeywordAttribute());
5184
5185	#include "clang/Serialization/AttrPCHWrite.inc"
5186	}
5187
5188	/// Emit the list of attributes to the specified record.
5189	void ASTRecordWriter::AddAttributes(ArrayRef<const Attr *> Attrs) {
5190	push_back(N: Attrs.size());
5191	for (const auto *A : Attrs)
5192	AddAttr(A);
5193	}
5194
5195	void ASTWriter::AddToken(const Token &Tok, RecordDataImpl &Record) {
5196	AddSourceLocation(Loc: Tok.getLocation(), Record);
5197	// FIXME: Should translate token kind to a stable encoding.
5198	Record.push_back(Elt: Tok.getKind());
5199	// FIXME: Should translate token flags to a stable encoding.
5200	Record.push_back(Elt: Tok.getFlags());
5201
5202	if (Tok.isAnnotation()) {
5203	AddSourceLocation(Loc: Tok.getAnnotationEndLoc(), Record);
5204	switch (Tok.getKind()) {
5205	case tok::annot_pragma_loop_hint: {
5206	auto *Info = static_cast<PragmaLoopHintInfo *>(Tok.getAnnotationValue());
5207	AddToken(Tok: Info->PragmaName, Record);
5208	AddToken(Tok: Info->Option, Record);
5209	Record.push_back(Elt: Info->Toks.size());
5210	for (const auto &T : Info->Toks)
5211	AddToken(Tok: T, Record);
5212	break;
5213	}
5214	case tok::annot_pragma_pack: {
5215	auto *Info =
5216	static_cast<Sema::PragmaPackInfo *>(Tok.getAnnotationValue());
5217	Record.push_back(Elt: static_cast<unsigned>(Info->Action));
5218	AddString(Str: Info->SlotLabel, Record);
5219	AddToken(Tok: Info->Alignment, Record);
5220	break;
5221	}
5222	// Some annotation tokens do not use the PtrData field.
5223	case tok::annot_pragma_openmp:
5224	case tok::annot_pragma_openmp_end:
5225	case tok::annot_pragma_unused:
5226	case tok::annot_pragma_openacc:
5227	case tok::annot_pragma_openacc_end:
5228	case tok::annot_repl_input_end:
5229	break;
5230	default:
5231	llvm_unreachable("missing serialization code for annotation token");
5232	}
5233	} else {
5234	Record.push_back(Elt: Tok.getLength());
5235	// FIXME: When reading literal tokens, reconstruct the literal pointer if it
5236	// is needed.
5237	AddIdentifierRef(II: Tok.getIdentifierInfo(), Record);
5238	}
5239	}
5240
5241	void ASTWriter::AddString(StringRef Str, RecordDataImpl &Record) {
5242	Record.push_back(Elt: Str.size());
5243	llvm::append_range(C&: Record, R&: Str);
5244	}
5245
5246	void ASTWriter::AddStringBlob(StringRef Str, RecordDataImpl &Record,
5247	SmallVectorImpl<char> &Blob) {
5248	Record.push_back(Elt: Str.size());
5249	llvm::append_range(C&: Blob, R&: Str);
5250	}
5251
5252	bool ASTWriter::PreparePathForOutput(SmallVectorImpl<char> &Path) {
5253	assert(WritingAST && "can't prepare path for output when not writing AST");
5254
5255	// Leave special file names as they are.
5256	StringRef PathStr(Path.data(), Path.size());
5257	if (PathStr == "<built-in>" || PathStr == "<command line>")
5258	return false;
5259
5260	bool Changed = cleanPathForOutput(FileMgr&: PP->getFileManager(), Path);
5261
5262	// Remove a prefix to make the path relative, if relevant.
5263	const char *PathBegin = Path.data();
5264	const char *PathPtr =
5265	adjustFilenameForRelocatableAST(Filename: PathBegin, BaseDir: BaseDirectory);
5266	if (PathPtr != PathBegin) {
5267	Path.erase(CS: Path.begin(), CE: Path.begin() + (PathPtr - PathBegin));
5268	Changed = true;
5269	}
5270
5271	return Changed;
5272	}
5273
5274	void ASTWriter::AddPath(StringRef Path, RecordDataImpl &Record) {
5275	SmallString<128> FilePath(Path);
5276	PreparePathForOutput(Path&: FilePath);
5277	AddString(Str: FilePath, Record);
5278	}
5279
5280	void ASTWriter::AddPathBlob(StringRef Path, RecordDataImpl &Record,
5281	SmallVectorImpl<char> &Blob) {
5282	SmallString<128> FilePath(Path);
5283	PreparePathForOutput(Path&: FilePath);
5284	AddStringBlob(Str: FilePath, Record, Blob);
5285	}
5286
5287	void ASTWriter::EmitRecordWithPath(unsigned Abbrev, RecordDataRef Record,
5288	StringRef Path) {
5289	SmallString<128> FilePath(Path);
5290	PreparePathForOutput(Path&: FilePath);
5291	Stream.EmitRecordWithBlob(Abbrev, Vals: Record, Blob: FilePath);
5292	}
5293
5294	void ASTWriter::AddVersionTuple(const VersionTuple &Version,
5295	RecordDataImpl &Record) {
5296	Record.push_back(Elt: Version.getMajor());
5297	if (std::optional<unsigned> Minor = Version.getMinor())
5298	Record.push_back(Elt: *Minor + 1);
5299	else
5300	Record.push_back(Elt: 0);
5301	if (std::optional<unsigned> Subminor = Version.getSubminor())
5302	Record.push_back(Elt: *Subminor + 1);
5303	else
5304	Record.push_back(Elt: 0);
5305	}
5306
5307	/// Note that the identifier II occurs at the given offset
5308	/// within the identifier table.
5309	void ASTWriter::SetIdentifierOffset(const IdentifierInfo *II, uint32_t Offset) {
5310	IdentifierID ID = IdentifierIDs[II];
5311	// Only store offsets new to this AST file. Other identifier names are looked
5312	// up earlier in the chain and thus don't need an offset.
5313	if (!isLocalIdentifierID(ID))
5314	return;
5315
5316	// For local identifiers, the module file index must be 0.
5317
5318	assert(ID != 0);
5319	ID -= NUM_PREDEF_IDENT_IDS;
5320	assert(ID < IdentifierOffsets.size());
5321	IdentifierOffsets[ID] = Offset;
5322	}
5323
5324	/// Note that the selector Sel occurs at the given offset
5325	/// within the method pool/selector table.
5326	void ASTWriter::SetSelectorOffset(Selector Sel, uint32_t Offset) {
5327	unsigned ID = SelectorIDs[Sel];
5328	assert(ID && "Unknown selector");
5329	// Don't record offsets for selectors that are also available in a different
5330	// file.
5331	if (ID < FirstSelectorID)
5332	return;
5333	SelectorOffsets[ID - FirstSelectorID] = Offset;
5334	}
5335
5336	ASTWriter::ASTWriter(llvm::BitstreamWriter &Stream,
5337	SmallVectorImpl<char> &Buffer, ModuleCache &ModCache,
5338	ArrayRef<std::shared_ptr<ModuleFileExtension>> Extensions,
5339	bool IncludeTimestamps, bool BuildingImplicitModule,
5340	bool GeneratingReducedBMI)
5341	: Stream(Stream), Buffer(Buffer), ModCache(ModCache),
5342	IncludeTimestamps(IncludeTimestamps),
5343	BuildingImplicitModule(BuildingImplicitModule),
5344	GeneratingReducedBMI(GeneratingReducedBMI) {
5345	for (const auto &Ext : Extensions) {
5346	if (auto Writer = Ext->createExtensionWriter(Writer&: *this))
5347	ModuleFileExtensionWriters.push_back(x: std::move(Writer));
5348	}
5349	}
5350
5351	ASTWriter::~ASTWriter() = default;
5352
5353	const LangOptions &ASTWriter::getLangOpts() const {
5354	assert(WritingAST && "can't determine lang opts when not writing AST");
5355	return PP->getLangOpts();
5356	}
5357
5358	time_t ASTWriter::getTimestampForOutput(const FileEntry *E) const {
5359	return IncludeTimestamps ? E->getModificationTime() : 0;
5360	}
5361
5362	ASTFileSignature
5363	ASTWriter::WriteAST(llvm::PointerUnion<Sema *, Preprocessor *> Subject,
5364	StringRef OutputFile, Module *WritingModule,
5365	StringRef isysroot, bool ShouldCacheASTInMemory) {
5366	llvm::TimeTraceScope scope("WriteAST", OutputFile);
5367	WritingAST = true;
5368
5369	Sema *SemaPtr = dyn_cast<Sema *>(Val&: Subject);
5370	Preprocessor &PPRef =
5371	SemaPtr ? SemaPtr->getPreprocessor() : *cast<Preprocessor *>(Val&: Subject);
5372
5373	ASTHasCompilerErrors = PPRef.getDiagnostics().hasUncompilableErrorOccurred();
5374
5375	// Emit the file header.
5376	Stream.Emit(Val: (unsigned)'C', NumBits: 8);
5377	Stream.Emit(Val: (unsigned)'P', NumBits: 8);
5378	Stream.Emit(Val: (unsigned)'C', NumBits: 8);
5379	Stream.Emit(Val: (unsigned)'H', NumBits: 8);
5380
5381	WriteBlockInfoBlock();
5382
5383	PP = &PPRef;
5384	this->WritingModule = WritingModule;
5385	ASTFileSignature Signature = WriteASTCore(SemaPtr, isysroot, WritingModule);
5386	PP = nullptr;
5387	this->WritingModule = nullptr;
5388	this->BaseDirectory.clear();
5389
5390	WritingAST = false;
5391
5392	if (WritingModule && PPRef.getHeaderSearchInfo()
5393	.getHeaderSearchOpts()
5394	.ModulesValidateOncePerBuildSession)
5395	ModCache.updateModuleTimestamp(ModuleFilename: OutputFile);
5396
5397	if (ShouldCacheASTInMemory) {
5398	// Construct MemoryBuffer and update buffer manager.
5399	ModCache.getInMemoryModuleCache().addBuiltPCM(
5400	Filename: OutputFile, Buffer: llvm::MemoryBuffer::getMemBufferCopy(
5401	InputData: StringRef(Buffer.begin(), Buffer.size())));
5402	}
5403	return Signature;
5404	}
5405
5406	template<typename Vector>
5407	static void AddLazyVectorDecls(ASTWriter &Writer, Vector &Vec) {
5408	for (typename Vector::iterator I = Vec.begin(nullptr, true), E = Vec.end();
5409	I != E; ++I) {
5410	Writer.GetDeclRef(D: *I);
5411	}
5412	}
5413
5414	template <typename Vector>
5415	static void AddLazyVectorEmiitedDecls(ASTWriter &Writer, Vector &Vec,
5416	ASTWriter::RecordData &Record) {
5417	for (typename Vector::iterator I = Vec.begin(nullptr, true), E = Vec.end();
5418	I != E; ++I) {
5419	Writer.AddEmittedDeclRef(D: *I, Record);
5420	}
5421	}
5422
5423	void ASTWriter::computeNonAffectingInputFiles() {
5424	SourceManager &SrcMgr = PP->getSourceManager();
5425	unsigned N = SrcMgr.local_sloc_entry_size();
5426
5427	IsSLocAffecting.resize(N, t: true);
5428	IsSLocFileEntryAffecting.resize(N, t: true);
5429
5430	if (!WritingModule)
5431	return;
5432
5433	auto AffectingModuleMaps = GetAffectingModuleMaps(PP: *PP, RootModule: WritingModule);
5434
5435	unsigned FileIDAdjustment = 0;
5436	unsigned OffsetAdjustment = 0;
5437
5438	NonAffectingFileIDAdjustments.reserve(n: N);
5439	NonAffectingOffsetAdjustments.reserve(n: N);
5440
5441	NonAffectingFileIDAdjustments.push_back(x: FileIDAdjustment);
5442	NonAffectingOffsetAdjustments.push_back(x: OffsetAdjustment);
5443
5444	for (unsigned I = 1; I != N; ++I) {
5445	const SrcMgr::SLocEntry *SLoc = &SrcMgr.getLocalSLocEntry(Index: I);
5446	FileID FID = FileID::get(V: I);
5447	assert(&SrcMgr.getSLocEntry(FID) == SLoc);
5448
5449	if (!SLoc->isFile())
5450	continue;
5451	const SrcMgr::FileInfo &File = SLoc->getFile();
5452	const SrcMgr::ContentCache *Cache = &File.getContentCache();
5453	if (!Cache->OrigEntry)
5454	continue;
5455
5456	// Don't prune anything other than module maps.
5457	if (!isModuleMap(CK: File.getFileCharacteristic()))
5458	continue;
5459
5460	// Don't prune module maps if all are guaranteed to be affecting.
5461	if (!AffectingModuleMaps)
5462	continue;
5463
5464	// Don't prune module maps that are affecting.
5465	if (AffectingModuleMaps->DefinitionFileIDs.contains(V: FID))
5466	continue;
5467
5468	IsSLocAffecting[I] = false;
5469	IsSLocFileEntryAffecting[I] =
5470	AffectingModuleMaps->DefinitionFiles.contains(V: *Cache->OrigEntry);
5471
5472	FileIDAdjustment += 1;
5473	// Even empty files take up one element in the offset table.
5474	OffsetAdjustment += SrcMgr.getFileIDSize(FID) + 1;
5475
5476	// If the previous file was non-affecting as well, just extend its entry
5477	// with our information.
5478	if (!NonAffectingFileIDs.empty() &&
5479	NonAffectingFileIDs.back().ID == FID.ID - 1) {
5480	NonAffectingFileIDs.back() = FID;
5481	NonAffectingRanges.back().setEnd(SrcMgr.getLocForEndOfFile(FID));
5482	NonAffectingFileIDAdjustments.back() = FileIDAdjustment;
5483	NonAffectingOffsetAdjustments.back() = OffsetAdjustment;
5484	continue;
5485	}
5486
5487	NonAffectingFileIDs.push_back(x: FID);
5488	NonAffectingRanges.emplace_back(args: SrcMgr.getLocForStartOfFile(FID),
5489	args: SrcMgr.getLocForEndOfFile(FID));
5490	NonAffectingFileIDAdjustments.push_back(x: FileIDAdjustment);
5491	NonAffectingOffsetAdjustments.push_back(x: OffsetAdjustment);
5492	}
5493
5494	if (!PP->getHeaderSearchInfo().getHeaderSearchOpts().ModulesIncludeVFSUsage)
5495	return;
5496
5497	FileManager &FileMgr = PP->getFileManager();
5498	FileMgr.trackVFSUsage(Active: true);
5499	// Lookup the paths in the VFS to trigger `-ivfsoverlay` usage tracking.
5500	for (StringRef Path :
5501	PP->getHeaderSearchInfo().getHeaderSearchOpts().VFSOverlayFiles)
5502	FileMgr.getVirtualFileSystem().exists(Path);
5503	for (unsigned I = 1; I != N; ++I) {
5504	if (IsSLocAffecting[I]) {
5505	const SrcMgr::SLocEntry *SLoc = &SrcMgr.getLocalSLocEntry(Index: I);
5506	if (!SLoc->isFile())
5507	continue;
5508	const SrcMgr::FileInfo &File = SLoc->getFile();
5509	const SrcMgr::ContentCache *Cache = &File.getContentCache();
5510	if (!Cache->OrigEntry)
5511	continue;
5512	FileMgr.getVirtualFileSystem().exists(
5513	Path: Cache->OrigEntry->getNameAsRequested());
5514	}
5515	}
5516	FileMgr.trackVFSUsage(Active: false);
5517	}
5518
5519	void ASTWriter::PrepareWritingSpecialDecls(Sema &SemaRef) {
5520	ASTContext &Context = SemaRef.Context;
5521
5522	bool isModule = WritingModule != nullptr;
5523
5524	// Set up predefined declaration IDs.
5525	auto RegisterPredefDecl = [&] (Decl *D, PredefinedDeclIDs ID) {
5526	if (D) {
5527	assert(D->isCanonicalDecl() && "predefined decl is not canonical");
5528	DeclIDs[D] = ID;
5529	PredefinedDecls.insert(Ptr: D);
5530	}
5531	};
5532	RegisterPredefDecl(Context.getTranslationUnitDecl(),
5533	PREDEF_DECL_TRANSLATION_UNIT_ID);
5534	RegisterPredefDecl(Context.ObjCIdDecl, PREDEF_DECL_OBJC_ID_ID);
5535	RegisterPredefDecl(Context.ObjCSelDecl, PREDEF_DECL_OBJC_SEL_ID);
5536	RegisterPredefDecl(Context.ObjCClassDecl, PREDEF_DECL_OBJC_CLASS_ID);
5537	RegisterPredefDecl(Context.ObjCProtocolClassDecl,
5538	PREDEF_DECL_OBJC_PROTOCOL_ID);
5539	RegisterPredefDecl(Context.Int128Decl, PREDEF_DECL_INT_128_ID);
5540	RegisterPredefDecl(Context.UInt128Decl, PREDEF_DECL_UNSIGNED_INT_128_ID);
5541	RegisterPredefDecl(Context.ObjCInstanceTypeDecl,
5542	PREDEF_DECL_OBJC_INSTANCETYPE_ID);
5543	RegisterPredefDecl(Context.BuiltinVaListDecl, PREDEF_DECL_BUILTIN_VA_LIST_ID);
5544	RegisterPredefDecl(Context.VaListTagDecl, PREDEF_DECL_VA_LIST_TAG);
5545	RegisterPredefDecl(Context.BuiltinMSVaListDecl,
5546	PREDEF_DECL_BUILTIN_MS_VA_LIST_ID);
5547	RegisterPredefDecl(Context.MSGuidTagDecl,
5548	PREDEF_DECL_BUILTIN_MS_GUID_ID);
5549	RegisterPredefDecl(Context.ExternCContext, PREDEF_DECL_EXTERN_C_CONTEXT_ID);
5550	RegisterPredefDecl(Context.CFConstantStringTypeDecl,
5551	PREDEF_DECL_CF_CONSTANT_STRING_ID);
5552	RegisterPredefDecl(Context.CFConstantStringTagDecl,
5553	PREDEF_DECL_CF_CONSTANT_STRING_TAG_ID);
5554	#define BuiltinTemplate(BTName) \
5555	RegisterPredefDecl(Context.Decl##BTName, PREDEF_DECL##BTName##_ID);
5556	#include "clang/Basic/BuiltinTemplates.inc"
5557
5558	const TranslationUnitDecl *TU = Context.getTranslationUnitDecl();
5559
5560	// Force all top level declarations to be emitted.
5561	//
5562	// We start emitting top level declarations from the module purview to
5563	// implement the eliding unreachable declaration feature.
5564	for (const auto *D : TU->noload_decls()) {
5565	if (D->isFromASTFile())
5566	continue;
5567
5568	if (GeneratingReducedBMI) {
5569	if (D->isFromExplicitGlobalModule())
5570	continue;
5571
5572	// Don't force emitting static entities.
5573	//
5574	// Technically, all static entities shouldn't be in reduced BMI. The
5575	// language also specifies that the program exposes TU-local entities
5576	// is ill-formed. However, in practice, there are a lot of projects
5577	// uses `static inline` in the headers. So we can't get rid of all
5578	// static entities in reduced BMI now.
5579	if (IsInternalDeclFromFileContext(D))
5580	continue;
5581	}
5582
5583	// If we're writing C++ named modules, don't emit declarations which are
5584	// not from modules by default. They may be built in declarations (be
5585	// handled above) or implcit declarations (see the implementation of
5586	// `Sema::Initialize()` for example).
5587	if (isWritingStdCXXNamedModules() && !D->getOwningModule() &&
5588	D->isImplicit())
5589	continue;
5590
5591	GetDeclRef(D);
5592	}
5593
5594	if (GeneratingReducedBMI)
5595	return;
5596
5597	// Writing all of the tentative definitions in this file, in
5598	// TentativeDefinitions order. Generally, this record will be empty for
5599	// headers.
5600	AddLazyVectorDecls(*this, SemaRef.TentativeDefinitions);
5601
5602	// Writing all of the file scoped decls in this file.
5603	if (!isModule)
5604	AddLazyVectorDecls(*this, SemaRef.UnusedFileScopedDecls);
5605
5606	// Writing all of the delegating constructors we still need
5607	// to resolve.
5608	if (!isModule)
5609	AddLazyVectorDecls(*this, SemaRef.DelegatingCtorDecls);
5610
5611	// Writing all of the ext_vector declarations.
5612	AddLazyVectorDecls(*this, SemaRef.ExtVectorDecls);
5613
5614	// Writing all of the VTable uses information.
5615	if (!SemaRef.VTableUses.empty())
5616	for (unsigned I = 0, N = SemaRef.VTableUses.size(); I != N; ++I)
5617	GetDeclRef(SemaRef.VTableUses[I].first);
5618
5619	// Writing all of the UnusedLocalTypedefNameCandidates.
5620	for (const TypedefNameDecl *TD : SemaRef.UnusedLocalTypedefNameCandidates)
5621	GetDeclRef(TD);
5622
5623	// Writing all of pending implicit instantiations.
5624	for (const auto &I : SemaRef.PendingInstantiations)
5625	GetDeclRef(I.first);
5626	assert(SemaRef.PendingLocalImplicitInstantiations.empty() &&
5627	"There are local ones at end of translation unit!");
5628
5629	// Writing some declaration references.
5630	if (SemaRef.StdNamespace || SemaRef.StdBadAlloc || SemaRef.StdAlignValT) {
5631	GetDeclRef(SemaRef.getStdNamespace());
5632	GetDeclRef(SemaRef.getStdBadAlloc());
5633	GetDeclRef(SemaRef.getStdAlignValT());
5634	}
5635
5636	if (Context.getcudaConfigureCallDecl())
5637	GetDeclRef(Context.getcudaConfigureCallDecl());
5638
5639	// Writing all of the known namespaces.
5640	for (const auto &I : SemaRef.KnownNamespaces)
5641	if (!I.second)
5642	GetDeclRef(I.first);
5643
5644	// Writing all used, undefined objects that require definitions.
5645	SmallVector<std::pair<NamedDecl *, SourceLocation>, 16> Undefined;
5646	SemaRef.getUndefinedButUsed(Undefined&: Undefined);
5647	for (const auto &I : Undefined)
5648	GetDeclRef(I.first);
5649
5650	// Writing all delete-expressions that we would like to
5651	// analyze later in AST.
5652	if (!isModule)
5653	for (const auto &DeleteExprsInfo :
5654	SemaRef.getMismatchingDeleteExpressions())
5655	GetDeclRef(DeleteExprsInfo.first);
5656
5657	// Make sure visible decls, added to DeclContexts previously loaded from
5658	// an AST file, are registered for serialization. Likewise for template
5659	// specializations added to imported templates.
5660	for (const auto *I : DeclsToEmitEvenIfUnreferenced)
5661	GetDeclRef(D: I);
5662	DeclsToEmitEvenIfUnreferenced.clear();
5663
5664	// Make sure all decls associated with an identifier are registered for
5665	// serialization, if we're storing decls with identifiers.
5666	if (!WritingModule || !getLangOpts().CPlusPlus) {
5667	llvm::SmallVector<const IdentifierInfo*, 256> IIs;
5668	for (const auto &ID : SemaRef.PP.getIdentifierTable()) {
5669	const IdentifierInfo *II = ID.second;
5670	if (!Chain || !II->isFromAST() || II->hasChangedSinceDeserialization() ||
5671	II->hasFETokenInfoChangedSinceDeserialization())
5672	IIs.push_back(II);
5673	}
5674	// Sort the identifiers to visit based on their name.
5675	llvm::sort(IIs, llvm::deref<std::less<>>());
5676	const LangOptions &LangOpts = getLangOpts();
5677	for (const IdentifierInfo *II : IIs)
5678	for (NamedDecl *D : SemaRef.IdResolver.decls(II))
5679	GetDeclRef(getDeclForLocalLookup(LangOpts, D));
5680	}
5681
5682	// Write all of the DeclsToCheckForDeferredDiags.
5683	for (auto *D : SemaRef.DeclsToCheckForDeferredDiags)
5684	GetDeclRef(D);
5685
5686	// Write all classes that need to emit the vtable definitions if required.
5687	if (isWritingStdCXXNamedModules())
5688	for (CXXRecordDecl *RD : PendingEmittingVTables)
5689	GetDeclRef(RD);
5690	else
5691	PendingEmittingVTables.clear();
5692	}
5693
5694	void ASTWriter::WriteSpecialDeclRecords(Sema &SemaRef) {
5695	ASTContext &Context = SemaRef.Context;
5696
5697	bool isModule = WritingModule != nullptr;
5698
5699	// Write the record containing external, unnamed definitions.
5700	if (!EagerlyDeserializedDecls.empty())
5701	Stream.EmitRecord(Code: EAGERLY_DESERIALIZED_DECLS, Vals: EagerlyDeserializedDecls);
5702
5703	if (!ModularCodegenDecls.empty())
5704	Stream.EmitRecord(Code: MODULAR_CODEGEN_DECLS, Vals: ModularCodegenDecls);
5705
5706	// Write the record containing tentative definitions.
5707	RecordData TentativeDefinitions;
5708	AddLazyVectorEmiitedDecls(Writer&: *this, Vec&: SemaRef.TentativeDefinitions,
5709	Record&: TentativeDefinitions);
5710	if (!TentativeDefinitions.empty())
5711	Stream.EmitRecord(Code: TENTATIVE_DEFINITIONS, Vals: TentativeDefinitions);
5712
5713	// Write the record containing unused file scoped decls.
5714	RecordData UnusedFileScopedDecls;
5715	if (!isModule)
5716	AddLazyVectorEmiitedDecls(Writer&: *this, Vec&: SemaRef.UnusedFileScopedDecls,
5717	Record&: UnusedFileScopedDecls);
5718	if (!UnusedFileScopedDecls.empty())
5719	Stream.EmitRecord(Code: UNUSED_FILESCOPED_DECLS, Vals: UnusedFileScopedDecls);
5720
5721	// Write the record containing ext_vector type names.
5722	RecordData ExtVectorDecls;
5723	AddLazyVectorEmiitedDecls(Writer&: *this, Vec&: SemaRef.ExtVectorDecls, Record&: ExtVectorDecls);
5724	if (!ExtVectorDecls.empty())
5725	Stream.EmitRecord(Code: EXT_VECTOR_DECLS, Vals: ExtVectorDecls);
5726
5727	// Write the record containing VTable uses information.
5728	RecordData VTableUses;
5729	if (!SemaRef.VTableUses.empty()) {
5730	for (unsigned I = 0, N = SemaRef.VTableUses.size(); I != N; ++I) {
5731	CXXRecordDecl *D = SemaRef.VTableUses[I].first;
5732	if (!wasDeclEmitted(D))
5733	continue;
5734
5735	AddDeclRef(D, VTableUses);
5736	AddSourceLocation(Loc: SemaRef.VTableUses[I].second, Record&: VTableUses);
5737	VTableUses.push_back(Elt: SemaRef.VTablesUsed[D]);
5738	}
5739	Stream.EmitRecord(Code: VTABLE_USES, Vals: VTableUses);
5740	}
5741
5742	// Write the record containing potentially unused local typedefs.
5743	RecordData UnusedLocalTypedefNameCandidates;
5744	for (const TypedefNameDecl *TD : SemaRef.UnusedLocalTypedefNameCandidates)
5745	AddEmittedDeclRef(TD, UnusedLocalTypedefNameCandidates);
5746	if (!UnusedLocalTypedefNameCandidates.empty())
5747	Stream.EmitRecord(Code: UNUSED_LOCAL_TYPEDEF_NAME_CANDIDATES,
5748	Vals: UnusedLocalTypedefNameCandidates);
5749
5750	// Write the record containing pending implicit instantiations.
5751	RecordData PendingInstantiations;
5752	for (const auto &I : SemaRef.PendingInstantiations) {
5753	if (!wasDeclEmitted(I.first))
5754	continue;
5755
5756	AddDeclRef(I.first, PendingInstantiations);
5757	AddSourceLocation(Loc: I.second, Record&: PendingInstantiations);
5758	}
5759	if (!PendingInstantiations.empty())
5760	Stream.EmitRecord(Code: PENDING_IMPLICIT_INSTANTIATIONS, Vals: PendingInstantiations);
5761
5762	// Write the record containing declaration references of Sema.
5763	RecordData SemaDeclRefs;
5764	if (SemaRef.StdNamespace || SemaRef.StdBadAlloc || SemaRef.StdAlignValT) {
5765	auto AddEmittedDeclRefOrZero = [this, &SemaDeclRefs](Decl *D) {
5766	if (!D || !wasDeclEmitted(D))
5767	SemaDeclRefs.push_back(Elt: 0);
5768	else
5769	AddDeclRef(D, Record&: SemaDeclRefs);
5770	};
5771
5772	AddEmittedDeclRefOrZero(SemaRef.getStdNamespace());
5773	AddEmittedDeclRefOrZero(SemaRef.getStdBadAlloc());
5774	AddEmittedDeclRefOrZero(SemaRef.getStdAlignValT());
5775	}
5776	if (!SemaDeclRefs.empty())
5777	Stream.EmitRecord(Code: SEMA_DECL_REFS, Vals: SemaDeclRefs);
5778
5779	// Write the record containing decls to be checked for deferred diags.
5780	RecordData DeclsToCheckForDeferredDiags;
5781	for (auto *D : SemaRef.DeclsToCheckForDeferredDiags)
5782	if (wasDeclEmitted(D))
5783	AddDeclRef(D, Record&: DeclsToCheckForDeferredDiags);
5784	if (!DeclsToCheckForDeferredDiags.empty())
5785	Stream.EmitRecord(Code: DECLS_TO_CHECK_FOR_DEFERRED_DIAGS,
5786	Vals: DeclsToCheckForDeferredDiags);
5787
5788	// Write the record containing CUDA-specific declaration references.
5789	RecordData CUDASpecialDeclRefs;
5790	if (auto *CudaCallDecl = Context.getcudaConfigureCallDecl();
5791	CudaCallDecl && wasDeclEmitted(CudaCallDecl)) {
5792	AddDeclRef(CudaCallDecl, CUDASpecialDeclRefs);
5793	Stream.EmitRecord(Code: CUDA_SPECIAL_DECL_REFS, Vals: CUDASpecialDeclRefs);
5794	}
5795
5796	// Write the delegating constructors.
5797	RecordData DelegatingCtorDecls;
5798	if (!isModule)
5799	AddLazyVectorEmiitedDecls(Writer&: *this, Vec&: SemaRef.DelegatingCtorDecls,
5800	Record&: DelegatingCtorDecls);
5801	if (!DelegatingCtorDecls.empty())
5802	Stream.EmitRecord(Code: DELEGATING_CTORS, Vals: DelegatingCtorDecls);
5803
5804	// Write the known namespaces.
5805	RecordData KnownNamespaces;
5806	for (const auto &I : SemaRef.KnownNamespaces) {
5807	if (!I.second && wasDeclEmitted(I.first))
5808	AddDeclRef(I.first, KnownNamespaces);
5809	}
5810	if (!KnownNamespaces.empty())
5811	Stream.EmitRecord(Code: KNOWN_NAMESPACES, Vals: KnownNamespaces);
5812
5813	// Write the undefined internal functions and variables, and inline functions.
5814	RecordData UndefinedButUsed;
5815	SmallVector<std::pair<NamedDecl *, SourceLocation>, 16> Undefined;
5816	SemaRef.getUndefinedButUsed(Undefined);
5817	for (const auto &I : Undefined) {
5818	if (!wasDeclEmitted(I.first))
5819	continue;
5820
5821	AddDeclRef(I.first, UndefinedButUsed);
5822	AddSourceLocation(Loc: I.second, Record&: UndefinedButUsed);
5823	}
5824	if (!UndefinedButUsed.empty())
5825	Stream.EmitRecord(Code: UNDEFINED_BUT_USED, Vals: UndefinedButUsed);
5826
5827	// Write all delete-expressions that we would like to
5828	// analyze later in AST.
5829	RecordData DeleteExprsToAnalyze;
5830	if (!isModule) {
5831	for (const auto &DeleteExprsInfo :
5832	SemaRef.getMismatchingDeleteExpressions()) {
5833	if (!wasDeclEmitted(DeleteExprsInfo.first))
5834	continue;
5835
5836	AddDeclRef(DeleteExprsInfo.first, DeleteExprsToAnalyze);
5837	DeleteExprsToAnalyze.push_back(Elt: DeleteExprsInfo.second.size());
5838	for (const auto &DeleteLoc : DeleteExprsInfo.second) {
5839	AddSourceLocation(Loc: DeleteLoc.first, Record&: DeleteExprsToAnalyze);
5840	DeleteExprsToAnalyze.push_back(Elt: DeleteLoc.second);
5841	}
5842	}
5843	}
5844	if (!DeleteExprsToAnalyze.empty())
5845	Stream.EmitRecord(Code: DELETE_EXPRS_TO_ANALYZE, Vals: DeleteExprsToAnalyze);
5846
5847	RecordData VTablesToEmit;
5848	for (CXXRecordDecl *RD : PendingEmittingVTables) {
5849	if (!wasDeclEmitted(RD))
5850	continue;
5851
5852	AddDeclRef(RD, VTablesToEmit);
5853	}
5854
5855	if (!VTablesToEmit.empty())
5856	Stream.EmitRecord(Code: VTABLES_TO_EMIT, Vals: VTablesToEmit);
5857	}
5858
5859	ASTFileSignature ASTWriter::WriteASTCore(Sema *SemaPtr, StringRef isysroot,
5860	Module *WritingModule) {
5861	using namespace llvm;
5862
5863	bool isModule = WritingModule != nullptr;
5864
5865	// Make sure that the AST reader knows to finalize itself.
5866	if (Chain)
5867	Chain->finalizeForWriting();
5868
5869	// This needs to be done very early, since everything that writes
5870	// SourceLocations or FileIDs depends on it.
5871	computeNonAffectingInputFiles();
5872
5873	writeUnhashedControlBlock(PP&: *PP);
5874
5875	// Don't reuse type ID and Identifier ID from readers for C++ standard named
5876	// modules since we want to support no-transitive-change model for named
5877	// modules. The theory for no-transitive-change model is,
5878	// for a user of a named module, the user can only access the indirectly
5879	// imported decls via the directly imported module. So that it is possible to
5880	// control what matters to the users when writing the module. It would be
5881	// problematic if the users can reuse the type IDs and identifier IDs from
5882	// indirectly imported modules arbitrarily. So we choose to clear these ID
5883	// here.
5884	if (isWritingStdCXXNamedModules()) {
5885	TypeIdxs.clear();
5886	IdentifierIDs.clear();
5887	}
5888
5889	// Look for any identifiers that were named while processing the
5890	// headers, but are otherwise not needed. We add these to the hash
5891	// table to enable checking of the predefines buffer in the case
5892	// where the user adds new macro definitions when building the AST
5893	// file.
5894	//
5895	// We do this before emitting any Decl and Types to make sure the
5896	// Identifier ID is stable.
5897	SmallVector<const IdentifierInfo *, 128> IIs;
5898	for (const auto &ID : PP->getIdentifierTable())
5899	if (IsInterestingNonMacroIdentifier(ID.second, *this))
5900	IIs.push_back(ID.second);
5901	// Sort the identifiers lexicographically before getting the references so
5902	// that their order is stable.
5903	llvm::sort(C&: IIs, Comp: llvm::deref<std::less<>>());
5904	for (const IdentifierInfo *II : IIs)
5905	getIdentifierRef(II);
5906
5907	// Write the set of weak, undeclared identifiers. We always write the
5908	// entire table, since later PCH files in a PCH chain are only interested in
5909	// the results at the end of the chain.
5910	RecordData WeakUndeclaredIdentifiers;
5911	if (SemaPtr) {
5912	for (const auto &WeakUndeclaredIdentifierList :
5913	SemaPtr->WeakUndeclaredIdentifiers) {
5914	const IdentifierInfo *const II = WeakUndeclaredIdentifierList.first;
5915	for (const auto &WI : WeakUndeclaredIdentifierList.second) {
5916	AddIdentifierRef(II, Record&: WeakUndeclaredIdentifiers);
5917	AddIdentifierRef(II: WI.getAlias(), Record&: WeakUndeclaredIdentifiers);
5918	AddSourceLocation(Loc: WI.getLocation(), Record&: WeakUndeclaredIdentifiers);
5919	}
5920	}
5921	}
5922
5923	// Form the record of special types.
5924	RecordData SpecialTypes;
5925	if (SemaPtr) {
5926	ASTContext &Context = SemaPtr->Context;
5927	AddTypeRef(Context, T: Context.getRawCFConstantStringType(), Record&: SpecialTypes);
5928	AddTypeRef(Context, T: Context.getFILEType(), Record&: SpecialTypes);
5929	AddTypeRef(Context, T: Context.getjmp_bufType(), Record&: SpecialTypes);
5930	AddTypeRef(Context, T: Context.getsigjmp_bufType(), Record&: SpecialTypes);
5931	AddTypeRef(Context, T: Context.ObjCIdRedefinitionType, Record&: SpecialTypes);
5932	AddTypeRef(Context, T: Context.ObjCClassRedefinitionType, Record&: SpecialTypes);
5933	AddTypeRef(Context, T: Context.ObjCSelRedefinitionType, Record&: SpecialTypes);
5934	AddTypeRef(Context, T: Context.getucontext_tType(), Record&: SpecialTypes);
5935	}
5936
5937	if (SemaPtr)
5938	PrepareWritingSpecialDecls(SemaRef&: *SemaPtr);
5939
5940	// Write the control block
5941	WriteControlBlock(PP&: *PP, isysroot);
5942
5943	// Write the remaining AST contents.
5944	Stream.FlushToWord();
5945	ASTBlockRange.first = Stream.GetCurrentBitNo() >> 3;
5946	Stream.EnterSubblock(BlockID: AST_BLOCK_ID, CodeLen: 5);
5947	ASTBlockStartOffset = Stream.GetCurrentBitNo();
5948
5949	// This is so that older clang versions, before the introduction
5950	// of the control block, can read and reject the newer PCH format.
5951	{
5952	RecordData Record = {VERSION_MAJOR};
5953	Stream.EmitRecord(Code: METADATA_OLD_FORMAT, Vals: Record);
5954	}
5955
5956	// For method pool in the module, if it contains an entry for a selector,
5957	// the entry should be complete, containing everything introduced by that
5958	// module and all modules it imports. It's possible that the entry is out of
5959	// date, so we need to pull in the new content here.
5960
5961	// It's possible that updateOutOfDateSelector can update SelectorIDs. To be
5962	// safe, we copy all selectors out.
5963	if (SemaPtr) {
5964	llvm::SmallVector<Selector, 256> AllSelectors;
5965	for (auto &SelectorAndID : SelectorIDs)
5966	AllSelectors.push_back(Elt: SelectorAndID.first);
5967	for (auto &Selector : AllSelectors)
5968	SemaPtr->ObjC().updateOutOfDateSelector(Sel: Selector);
5969	}
5970
5971	if (Chain) {
5972	// Write the mapping information describing our module dependencies and how
5973	// each of those modules were mapped into our own offset/ID space, so that
5974	// the reader can build the appropriate mapping to its own offset/ID space.
5975	// The map consists solely of a blob with the following format:
5976	// *(module-kind:i8
5977	// module-name-len:i16 module-name:len*i8
5978	// source-location-offset:i32
5979	// identifier-id:i32
5980	// preprocessed-entity-id:i32
5981	// macro-definition-id:i32
5982	// submodule-id:i32
5983	// selector-id:i32
5984	// declaration-id:i32
5985	// c++-base-specifiers-id:i32
5986	// type-id:i32)
5987	//
5988	// module-kind is the ModuleKind enum value. If it is MK_PrebuiltModule,
5989	// MK_ExplicitModule or MK_ImplicitModule, then the module-name is the
5990	// module name. Otherwise, it is the module file name.
5991	auto Abbrev = std::make_shared<BitCodeAbbrev>();
5992	Abbrev->Add(OpInfo: BitCodeAbbrevOp(MODULE_OFFSET_MAP));
5993	Abbrev->Add(OpInfo: BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
5994	unsigned ModuleOffsetMapAbbrev = Stream.EmitAbbrev(Abbv: std::move(Abbrev));
5995	SmallString<2048> Buffer;
5996	{
5997	llvm::raw_svector_ostream Out(Buffer);
5998	for (ModuleFile &M : Chain->ModuleMgr) {
5999	using namespace llvm::support;
6000
6001	endian::Writer LE(Out, llvm::endianness::little);
6002	LE.write<uint8_t>(Val: static_cast<uint8_t>(M.Kind));
6003	StringRef Name = M.isModule() ? M.ModuleName : M.FileName;
6004	LE.write<uint16_t>(Val: Name.size());
6005	Out.write(Ptr: Name.data(), Size: Name.size());
6006
6007	// Note: if a base ID was uint max, it would not be possible to load
6008	// another module after it or have more than one entity inside it.
6009	uint32_t None = std::numeric_limits<uint32_t>::max();
6010
6011	auto writeBaseIDOrNone = [&](auto BaseID, bool ShouldWrite) {
6012	assert(BaseID < std::numeric_limits<uint32_t>::max() && "base id too high");
6013	if (ShouldWrite)
6014	LE.write<uint32_t>(BaseID);
6015	else
6016	LE.write<uint32_t>(Val: None);
6017	};
6018
6019	// These values should be unique within a chain, since they will be read
6020	// as keys into ContinuousRangeMaps.
6021	writeBaseIDOrNone(M.BaseMacroID, M.LocalNumMacros);
6022	writeBaseIDOrNone(M.BasePreprocessedEntityID,
6023	M.NumPreprocessedEntities);
6024	writeBaseIDOrNone(M.BaseSubmoduleID, M.LocalNumSubmodules);
6025	writeBaseIDOrNone(M.BaseSelectorID, M.LocalNumSelectors);
6026	}
6027	}
6028	RecordData::value_type Record[] = {MODULE_OFFSET_MAP};
6029	Stream.EmitRecordWithBlob(Abbrev: ModuleOffsetMapAbbrev, Vals: Record,
6030	BlobData: Buffer.data(), BlobLen: Buffer.size());
6031	}
6032
6033	if (SemaPtr)
6034	WriteDeclAndTypes(Context&: SemaPtr->Context);
6035
6036	WriteFileDeclIDsMap();
6037	WriteSourceManagerBlock(SourceMgr&: PP->getSourceManager());
6038	if (SemaPtr)
6039	WriteComments(Context&: SemaPtr->Context);
6040	WritePreprocessor(PP: *PP, IsModule: isModule);
6041	WriteHeaderSearch(HS: PP->getHeaderSearchInfo());
6042	if (SemaPtr) {
6043	WriteSelectors(SemaRef&: *SemaPtr);
6044	WriteReferencedSelectorsPool(SemaRef&: *SemaPtr);
6045	WriteLateParsedTemplates(SemaRef&: *SemaPtr);
6046	}
6047	WriteIdentifierTable(PP&: *PP, IdResolver: SemaPtr ? &SemaPtr->IdResolver : nullptr, IsModule: isModule);
6048	if (SemaPtr) {
6049	WriteFPPragmaOptions(Opts: SemaPtr->CurFPFeatureOverrides());
6050	WriteOpenCLExtensions(SemaRef&: *SemaPtr);
6051	WriteCUDAPragmas(SemaRef&: *SemaPtr);
6052	}
6053
6054	// If we're emitting a module, write out the submodule information.
6055	if (WritingModule)
6056	WriteSubmodules(WritingModule, Context: SemaPtr ? &SemaPtr->Context : nullptr);
6057
6058	Stream.EmitRecord(Code: SPECIAL_TYPES, Vals: SpecialTypes);
6059
6060	if (SemaPtr)
6061	WriteSpecialDeclRecords(SemaRef&: *SemaPtr);
6062
6063	// Write the record containing weak undeclared identifiers.
6064	if (!WeakUndeclaredIdentifiers.empty())
6065	Stream.EmitRecord(Code: WEAK_UNDECLARED_IDENTIFIERS,
6066	Vals: WeakUndeclaredIdentifiers);
6067
6068	if (!WritingModule) {
6069	// Write the submodules that were imported, if any.
6070	struct ModuleInfo {
6071	uint64_t ID;
6072	Module *M;
6073	ModuleInfo(uint64_t ID, Module *M) : ID(ID), M(M) {}
6074	};
6075	llvm::SmallVector<ModuleInfo, 64> Imports;
6076	if (SemaPtr) {
6077	for (const auto *I : SemaPtr->Context.local_imports()) {
6078	assert(SubmoduleIDs.contains(I->getImportedModule()));
6079	Imports.push_back(Elt: ModuleInfo(SubmoduleIDs[I->getImportedModule()],
6080	I->getImportedModule()));
6081	}
6082	}
6083
6084	if (!Imports.empty()) {
6085	auto Cmp = [](const ModuleInfo &A, const ModuleInfo &B) {
6086	return A.ID < B.ID;
6087	};
6088	auto Eq = [](const ModuleInfo &A, const ModuleInfo &B) {
6089	return A.ID == B.ID;
6090	};
6091
6092	// Sort and deduplicate module IDs.
6093	llvm::sort(C&: Imports, Comp: Cmp);
6094	Imports.erase(CS: llvm::unique(R&: Imports, P: Eq), CE: Imports.end());
6095
6096	RecordData ImportedModules;
6097	for (const auto &Import : Imports) {
6098	ImportedModules.push_back(Elt: Import.ID);
6099	// FIXME: If the module has macros imported then later has declarations
6100	// imported, this location won't be the right one as a location for the
6101	// declaration imports.
6102	AddSourceLocation(Loc: PP->getModuleImportLoc(M: Import.M), Record&: ImportedModules);
6103	}
6104
6105	Stream.EmitRecord(Code: IMPORTED_MODULES, Vals: ImportedModules);
6106	}
6107	}
6108
6109	WriteObjCCategories();
6110	if (SemaPtr) {
6111	if (!WritingModule) {
6112	WriteOptimizePragmaOptions(SemaRef&: *SemaPtr);
6113	WriteMSStructPragmaOptions(SemaRef&: *SemaPtr);
6114	WriteMSPointersToMembersPragmaOptions(SemaRef&: *SemaPtr);
6115	}
6116	WritePackPragmaOptions(SemaRef&: *SemaPtr);
6117	WriteFloatControlPragmaOptions(SemaRef&: *SemaPtr);
6118	WriteDeclsWithEffectsToVerify(SemaRef&: *SemaPtr);
6119	}
6120
6121	// Some simple statistics
6122	RecordData::value_type Record[] = {NumStatements,
6123	NumMacros,
6124	NumLexicalDeclContexts,
6125	NumVisibleDeclContexts,
6126	NumModuleLocalDeclContexts,
6127	NumTULocalDeclContexts};
6128	Stream.EmitRecord(Code: STATISTICS, Vals: Record);
6129	Stream.ExitBlock();
6130	Stream.FlushToWord();
6131	ASTBlockRange.second = Stream.GetCurrentBitNo() >> 3;
6132
6133	// Write the module file extension blocks.
6134	if (SemaPtr)
6135	for (const auto &ExtWriter : ModuleFileExtensionWriters)
6136	WriteModuleFileExtension(SemaRef&: *SemaPtr, Writer&: *ExtWriter);
6137
6138	return backpatchSignature();
6139	}
6140
6141	void ASTWriter::EnteringModulePurview() {
6142	// In C++20 named modules, all entities before entering the module purview
6143	// lives in the GMF.
6144	if (GeneratingReducedBMI)
6145	DeclUpdatesFromGMF.swap(RHS&: DeclUpdates);
6146	}
6147
6148	// Add update records for all mangling numbers and static local numbers.
6149	// These aren't really update records, but this is a convenient way of
6150	// tagging this rare extra data onto the declarations.
6151	void ASTWriter::AddedManglingNumber(const Decl *D, unsigned Number) {
6152	if (D->isFromASTFile())
6153	return;
6154
6155	DeclUpdates[D].push_back(Elt: DeclUpdate(DeclUpdateKind::ManglingNumber, Number));
6156	}
6157	void ASTWriter::AddedStaticLocalNumbers(const Decl *D, unsigned Number) {
6158	if (D->isFromASTFile())
6159	return;
6160
6161	DeclUpdates[D].push_back(
6162	Elt: DeclUpdate(DeclUpdateKind::StaticLocalNumber, Number));
6163	}
6164
6165	void ASTWriter::AddedAnonymousNamespace(const TranslationUnitDecl *TU,
6166	NamespaceDecl *AnonNamespace) {
6167	// If the translation unit has an anonymous namespace, and we don't already
6168	// have an update block for it, write it as an update block.
6169	// FIXME: Why do we not do this if there's already an update block?
6170	if (NamespaceDecl *NS = TU->getAnonymousNamespace()) {
6171	ASTWriter::UpdateRecord &Record = DeclUpdates[TU];
6172	if (Record.empty())
6173	Record.push_back(
6174	Elt: DeclUpdate(DeclUpdateKind::CXXAddedAnonymousNamespace, NS));
6175	}
6176	}
6177
6178	void ASTWriter::WriteDeclAndTypes(ASTContext &Context) {
6179	// Keep writing types, declarations, and declaration update records
6180	// until we've emitted all of them.
6181	RecordData DeclUpdatesOffsetsRecord;
6182	Stream.EnterSubblock(BlockID: DECLTYPES_BLOCK_ID, /*bits for abbreviations*/ CodeLen: 6);
6183	DeclTypesBlockStartOffset = Stream.GetCurrentBitNo();
6184	WriteTypeAbbrevs();
6185	WriteDeclAbbrevs();
6186	do {
6187	WriteDeclUpdatesBlocks(Context, OffsetsRecord&: DeclUpdatesOffsetsRecord);
6188	while (!DeclTypesToEmit.empty()) {
6189	DeclOrType DOT = DeclTypesToEmit.front();
6190	DeclTypesToEmit.pop();
6191	if (DOT.isType())
6192	WriteType(Context, T: DOT.getType());
6193	else
6194	WriteDecl(Context, D: DOT.getDecl());
6195	}
6196	} while (!DeclUpdates.empty());
6197
6198	DoneWritingDeclsAndTypes = true;
6199
6200	// DelayedNamespace is only meaningful in reduced BMI.
6201	// See the comments of DelayedNamespace for details.
6202	assert(DelayedNamespace.empty() || GeneratingReducedBMI);
6203	RecordData DelayedNamespaceRecord;
6204	for (NamespaceDecl *NS : DelayedNamespace) {
6205	uint64_t LexicalOffset = WriteDeclContextLexicalBlock(Context, NS);
6206	uint64_t VisibleOffset = 0;
6207	uint64_t ModuleLocalOffset = 0;
6208	uint64_t TULocalOffset = 0;
6209	WriteDeclContextVisibleBlock(Context, NS, VisibleOffset, ModuleLocalOffset,
6210	TULocalOffset);
6211
6212	// Write the offset relative to current block.
6213	if (LexicalOffset)
6214	LexicalOffset -= DeclTypesBlockStartOffset;
6215
6216	if (VisibleOffset)
6217	VisibleOffset -= DeclTypesBlockStartOffset;
6218
6219	if (ModuleLocalOffset)
6220	ModuleLocalOffset -= DeclTypesBlockStartOffset;
6221
6222	if (TULocalOffset)
6223	TULocalOffset -= DeclTypesBlockStartOffset;
6224
6225	AddDeclRef(NS, DelayedNamespaceRecord);
6226	DelayedNamespaceRecord.push_back(Elt: LexicalOffset);
6227	DelayedNamespaceRecord.push_back(Elt: VisibleOffset);
6228	DelayedNamespaceRecord.push_back(Elt: ModuleLocalOffset);
6229	DelayedNamespaceRecord.push_back(Elt: TULocalOffset);
6230	}
6231
6232	// The process of writing lexical and visible block for delayed namespace
6233	// shouldn't introduce any new decls, types or update to emit.
6234	assert(DeclTypesToEmit.empty());
6235	assert(DeclUpdates.empty());
6236
6237	Stream.ExitBlock();
6238
6239	// These things can only be done once we've written out decls and types.
6240	WriteTypeDeclOffsets();
6241	if (!DeclUpdatesOffsetsRecord.empty())
6242	Stream.EmitRecord(Code: DECL_UPDATE_OFFSETS, Vals: DeclUpdatesOffsetsRecord);
6243
6244	if (!DelayedNamespaceRecord.empty())
6245	Stream.EmitRecord(Code: DELAYED_NAMESPACE_LEXICAL_VISIBLE_RECORD,
6246	Vals: DelayedNamespaceRecord);
6247
6248	if (!RelatedDeclsMap.empty()) {
6249	// TODO: on disk hash table for related decls mapping might be more
6250	// efficent becuase it allows lazy deserialization.
6251	RecordData RelatedDeclsMapRecord;
6252	for (const auto &Pair : RelatedDeclsMap) {
6253	RelatedDeclsMapRecord.push_back(Elt: Pair.first.getRawValue());
6254	RelatedDeclsMapRecord.push_back(Elt: Pair.second.size());
6255	for (const auto &Lambda : Pair.second)
6256	RelatedDeclsMapRecord.push_back(Elt: Lambda.getRawValue());
6257	}
6258
6259	auto Abv = std::make_shared<llvm::BitCodeAbbrev>();
6260	Abv->Add(OpInfo: llvm::BitCodeAbbrevOp(RELATED_DECLS_MAP));
6261	Abv->Add(OpInfo: llvm::BitCodeAbbrevOp(llvm::BitCodeAbbrevOp::Array));
6262	Abv->Add(OpInfo: llvm::BitCodeAbbrevOp(llvm::BitCodeAbbrevOp::VBR, 6));
6263	unsigned FunctionToLambdaMapAbbrev = Stream.EmitAbbrev(Abbv: std::move(Abv));
6264	Stream.EmitRecord(Code: RELATED_DECLS_MAP, Vals: RelatedDeclsMapRecord,
6265	Abbrev: FunctionToLambdaMapAbbrev);
6266	}
6267
6268	if (!SpecializationsUpdates.empty()) {
6269	WriteSpecializationsUpdates(/*IsPartial=*/false);
6270	SpecializationsUpdates.clear();
6271	}
6272
6273	if (!PartialSpecializationsUpdates.empty()) {
6274	WriteSpecializationsUpdates(/*IsPartial=*/true);
6275	PartialSpecializationsUpdates.clear();
6276	}
6277
6278	const TranslationUnitDecl *TU = Context.getTranslationUnitDecl();
6279	// Create a lexical update block containing all of the declarations in the
6280	// translation unit that do not come from other AST files.
6281	SmallVector<DeclID, 128> NewGlobalKindDeclPairs;
6282	for (const auto *D : TU->noload_decls()) {
6283	if (D->isFromASTFile())
6284	continue;
6285
6286	// In reduced BMI, skip unreached declarations.
6287	if (!wasDeclEmitted(D))
6288	continue;
6289
6290	NewGlobalKindDeclPairs.push_back(D->getKind());
6291	NewGlobalKindDeclPairs.push_back(GetDeclRef(D).getRawValue());
6292	}
6293
6294	auto Abv = std::make_shared<llvm::BitCodeAbbrev>();
6295	Abv->Add(OpInfo: llvm::BitCodeAbbrevOp(TU_UPDATE_LEXICAL));
6296	Abv->Add(OpInfo: llvm::BitCodeAbbrevOp(llvm::BitCodeAbbrevOp::Blob));
6297	unsigned TuUpdateLexicalAbbrev = Stream.EmitAbbrev(Abbv: std::move(Abv));
6298
6299	RecordData::value_type Record[] = {TU_UPDATE_LEXICAL};
6300	Stream.EmitRecordWithBlob(Abbrev: TuUpdateLexicalAbbrev, Vals: Record,
6301	Blob: bytes(v: NewGlobalKindDeclPairs));
6302
6303	Abv = std::make_shared<llvm::BitCodeAbbrev>();
6304	Abv->Add(OpInfo: llvm::BitCodeAbbrevOp(UPDATE_VISIBLE));
6305	Abv->Add(OpInfo: llvm::BitCodeAbbrevOp(llvm::BitCodeAbbrevOp::VBR, 6));
6306	Abv->Add(OpInfo: llvm::BitCodeAbbrevOp(llvm::BitCodeAbbrevOp::Blob));
6307	UpdateVisibleAbbrev = Stream.EmitAbbrev(Abbv: std::move(Abv));
6308
6309	Abv = std::make_shared<llvm::BitCodeAbbrev>();
6310	Abv->Add(OpInfo: llvm::BitCodeAbbrevOp(UPDATE_MODULE_LOCAL_VISIBLE));
6311	Abv->Add(OpInfo: llvm::BitCodeAbbrevOp(llvm::BitCodeAbbrevOp::VBR, 6));
6312	Abv->Add(OpInfo: llvm::BitCodeAbbrevOp(llvm::BitCodeAbbrevOp::Blob));
6313	ModuleLocalUpdateVisibleAbbrev = Stream.EmitAbbrev(Abbv: std::move(Abv));
6314
6315	Abv = std::make_shared<llvm::BitCodeAbbrev>();
6316	Abv->Add(OpInfo: llvm::BitCodeAbbrevOp(UPDATE_TU_LOCAL_VISIBLE));
6317	Abv->Add(OpInfo: llvm::BitCodeAbbrevOp(llvm::BitCodeAbbrevOp::VBR, 6));
6318	Abv->Add(OpInfo: llvm::BitCodeAbbrevOp(llvm::BitCodeAbbrevOp::Blob));
6319	TULocalUpdateVisibleAbbrev = Stream.EmitAbbrev(Abbv: std::move(Abv));
6320
6321	// And a visible updates block for the translation unit.
6322	WriteDeclContextVisibleUpdate(Context, TU);
6323
6324	// If we have any extern "C" names, write out a visible update for them.
6325	if (Context.ExternCContext)
6326	WriteDeclContextVisibleUpdate(Context, Context.ExternCContext);
6327
6328	// Write the visible updates to DeclContexts.
6329	for (auto *DC : UpdatedDeclContexts)
6330	WriteDeclContextVisibleUpdate(Context, DC);
6331	}
6332
6333	void ASTWriter::WriteSpecializationsUpdates(bool IsPartial) {
6334	auto RecordType = IsPartial ? CXX_ADDED_TEMPLATE_PARTIAL_SPECIALIZATION
6335	: CXX_ADDED_TEMPLATE_SPECIALIZATION;
6336
6337	auto Abv = std::make_shared<llvm::BitCodeAbbrev>();
6338	Abv->Add(OpInfo: llvm::BitCodeAbbrevOp(RecordType));
6339	Abv->Add(OpInfo: llvm::BitCodeAbbrevOp(llvm::BitCodeAbbrevOp::VBR, 6));
6340	Abv->Add(OpInfo: llvm::BitCodeAbbrevOp(llvm::BitCodeAbbrevOp::Blob));
6341	auto UpdateSpecializationAbbrev = Stream.EmitAbbrev(Abbv: std::move(Abv));
6342
6343	auto &SpecUpdates =
6344	IsPartial ? PartialSpecializationsUpdates : SpecializationsUpdates;
6345	for (auto &SpecializationUpdate : SpecUpdates) {
6346	const NamedDecl *D = SpecializationUpdate.first;
6347
6348	llvm::SmallString<4096> LookupTable;
6349	GenerateSpecializationInfoLookupTable(D, Specializations&: SpecializationUpdate.second,
6350	LookupTable, IsPartial);
6351
6352	// Write the lookup table
6353	RecordData::value_type Record[] = {
6354	static_cast<RecordData::value_type>(RecordType),
6355	getDeclID(D).getRawValue()};
6356	Stream.EmitRecordWithBlob(Abbrev: UpdateSpecializationAbbrev, Vals: Record, Blob: LookupTable);
6357	}
6358	}
6359
6360	void ASTWriter::WriteDeclUpdatesBlocks(ASTContext &Context,
6361	RecordDataImpl &OffsetsRecord) {
6362	if (DeclUpdates.empty())
6363	return;
6364
6365	DeclUpdateMap LocalUpdates;
6366	LocalUpdates.swap(RHS&: DeclUpdates);
6367
6368	for (auto &DeclUpdate : LocalUpdates) {
6369	const Decl *D = DeclUpdate.first;
6370
6371	bool HasUpdatedBody = false;
6372	bool HasAddedVarDefinition = false;
6373	RecordData RecordData;
6374	ASTRecordWriter Record(Context, *this, RecordData);
6375	for (auto &Update : DeclUpdate.second) {
6376	DeclUpdateKind Kind = Update.getKind();
6377
6378	// An updated body is emitted last, so that the reader doesn't need
6379	// to skip over the lazy body to reach statements for other records.
6380	if (Kind == DeclUpdateKind::CXXAddedFunctionDefinition)
6381	HasUpdatedBody = true;
6382	else if (Kind == DeclUpdateKind::CXXAddedVarDefinition)
6383	HasAddedVarDefinition = true;
6384	else
6385	Record.push_back(N: llvm::to_underlying(E: Kind));
6386
6387	switch (Kind) {
6388	case DeclUpdateKind::CXXAddedImplicitMember:
6389	case DeclUpdateKind::CXXAddedAnonymousNamespace:
6390	assert(Update.getDecl() && "no decl to add?");
6391	Record.AddDeclRef(D: Update.getDecl());
6392	break;
6393	case DeclUpdateKind::CXXAddedFunctionDefinition:
6394	case DeclUpdateKind::CXXAddedVarDefinition:
6395	break;
6396
6397	case DeclUpdateKind::CXXPointOfInstantiation:
6398	// FIXME: Do we need to also save the template specialization kind here?
6399	Record.AddSourceLocation(Loc: Update.getLoc());
6400	break;
6401
6402	case DeclUpdateKind::CXXInstantiatedDefaultArgument:
6403	Record.writeStmtRef(
6404	cast<ParmVarDecl>(Val: Update.getDecl())->getDefaultArg());
6405	break;
6406
6407	case DeclUpdateKind::CXXInstantiatedDefaultMemberInitializer:
6408	Record.AddStmt(
6409	cast<FieldDecl>(Val: Update.getDecl())->getInClassInitializer());
6410	break;
6411
6412	case DeclUpdateKind::CXXInstantiatedClassDefinition: {
6413	auto *RD = cast<CXXRecordDecl>(Val: D);
6414	UpdatedDeclContexts.insert(RD->getPrimaryContext());
6415	Record.push_back(N: RD->isParamDestroyedInCallee());
6416	Record.push_back(N: llvm::to_underlying(RD->getArgPassingRestrictions()));
6417	Record.AddCXXDefinitionData(D: RD);
6418	Record.AddOffset(BitOffset: WriteDeclContextLexicalBlock(Context, RD));
6419
6420	// This state is sometimes updated by template instantiation, when we
6421	// switch from the specialization referring to the template declaration
6422	// to it referring to the template definition.
6423	if (auto *MSInfo = RD->getMemberSpecializationInfo()) {
6424	Record.push_back(N: MSInfo->getTemplateSpecializationKind());
6425	Record.AddSourceLocation(Loc: MSInfo->getPointOfInstantiation());
6426	} else {
6427	auto *Spec = cast<ClassTemplateSpecializationDecl>(Val: RD);
6428	Record.push_back(N: Spec->getTemplateSpecializationKind());
6429	Record.AddSourceLocation(Loc: Spec->getPointOfInstantiation());
6430
6431	// The instantiation might have been resolved to a partial
6432	// specialization. If so, record which one.
6433	auto From = Spec->getInstantiatedFrom();
6434	if (auto PartialSpec =
6435	From.dyn_cast<ClassTemplatePartialSpecializationDecl*>()) {
6436	Record.push_back(N: true);
6437	Record.AddDeclRef(PartialSpec);
6438	Record.AddTemplateArgumentList(
6439	TemplateArgs: &Spec->getTemplateInstantiationArgs());
6440	} else {
6441	Record.push_back(N: false);
6442	}
6443	}
6444	Record.push_back(N: llvm::to_underlying(RD->getTagKind()));
6445	Record.AddSourceLocation(Loc: RD->getLocation());
6446	Record.AddSourceLocation(Loc: RD->getBeginLoc());
6447	Record.AddSourceRange(Range: RD->getBraceRange());
6448
6449	// Instantiation may change attributes; write them all out afresh.
6450	Record.push_back(N: D->hasAttrs());
6451	if (D->hasAttrs())
6452	Record.AddAttributes(Attrs: D->getAttrs());
6453
6454	// FIXME: Ensure we don't get here for explicit instantiations.
6455	break;
6456	}
6457
6458	case DeclUpdateKind::CXXResolvedDtorDelete:
6459	Record.AddDeclRef(D: Update.getDecl());
6460	Record.AddStmt(cast<CXXDestructorDecl>(Val: D)->getOperatorDeleteThisArg());
6461	break;
6462
6463	case DeclUpdateKind::CXXResolvedExceptionSpec: {
6464	auto prototype =
6465	cast<FunctionDecl>(Val: D)->getType()->castAs<FunctionProtoType>();
6466	Record.writeExceptionSpecInfo(prototype->getExceptionSpecInfo());
6467	break;
6468	}
6469
6470	case DeclUpdateKind::CXXDeducedReturnType:
6471	Record.push_back(N: GetOrCreateTypeID(Context, T: Update.getType()));
6472	break;
6473
6474	case DeclUpdateKind::DeclMarkedUsed:
6475	break;
6476
6477	case DeclUpdateKind::ManglingNumber:
6478	case DeclUpdateKind::StaticLocalNumber:
6479	Record.push_back(N: Update.getNumber());
6480	break;
6481
6482	case DeclUpdateKind::DeclMarkedOpenMPThreadPrivate:
6483	Record.AddSourceRange(
6484	D->getAttr<OMPThreadPrivateDeclAttr>()->getRange());
6485	break;
6486
6487	case DeclUpdateKind::DeclMarkedOpenMPAllocate: {
6488	auto *A = D->getAttr<OMPAllocateDeclAttr>();
6489	Record.push_back(N: A->getAllocatorType());
6490	Record.AddStmt(S: A->getAllocator());
6491	Record.AddStmt(S: A->getAlignment());
6492	Record.AddSourceRange(Range: A->getRange());
6493	break;
6494	}
6495
6496	case DeclUpdateKind::DeclMarkedOpenMPDeclareTarget:
6497	Record.push_back(D->getAttr<OMPDeclareTargetDeclAttr>()->getMapType());
6498	Record.AddSourceRange(
6499	D->getAttr<OMPDeclareTargetDeclAttr>()->getRange());
6500	break;
6501
6502	case DeclUpdateKind::DeclExported:
6503	Record.push_back(N: getSubmoduleID(Mod: Update.getModule()));
6504	break;
6505
6506	case DeclUpdateKind::AddedAttrToRecord:
6507	Record.AddAttributes(Attrs: llvm::ArrayRef(Update.getAttr()));
6508	break;
6509	}
6510	}
6511
6512	// Add a trailing update record, if any. These must go last because we
6513	// lazily load their attached statement.
6514	if (!GeneratingReducedBMI || !CanElideDeclDef(D)) {
6515	if (HasUpdatedBody) {
6516	const auto *Def = cast<FunctionDecl>(Val: D);
6517	Record.push_back(
6518	N: llvm::to_underlying(E: DeclUpdateKind::CXXAddedFunctionDefinition));
6519	Record.push_back(N: Def->isInlined());
6520	Record.AddSourceLocation(Loc: Def->getInnerLocStart());
6521	Record.AddFunctionDefinition(FD: Def);
6522	} else if (HasAddedVarDefinition) {
6523	const auto *VD = cast<VarDecl>(Val: D);
6524	Record.push_back(
6525	N: llvm::to_underlying(E: DeclUpdateKind::CXXAddedVarDefinition));
6526	Record.push_back(N: VD->isInline());
6527	Record.push_back(N: VD->isInlineSpecified());
6528	Record.AddVarDeclInit(VD);
6529	}
6530	}
6531
6532	AddDeclRef(D, Record&: OffsetsRecord);
6533	OffsetsRecord.push_back(Elt: Record.Emit(Code: DECL_UPDATES));
6534	}
6535	}
6536
6537	void ASTWriter::AddAlignPackInfo(const Sema::AlignPackInfo &Info,
6538	RecordDataImpl &Record) {
6539	uint32_t Raw = Sema::AlignPackInfo::getRawEncoding(Info);
6540	Record.push_back(Elt: Raw);
6541	}
6542
6543	FileID ASTWriter::getAdjustedFileID(FileID FID) const {
6544	if (FID.isInvalid() || PP->getSourceManager().isLoadedFileID(FID) ||
6545	NonAffectingFileIDs.empty())
6546	return FID;
6547	auto It = llvm::lower_bound(Range: NonAffectingFileIDs, Value&: FID);
6548	unsigned Idx = std::distance(first: NonAffectingFileIDs.begin(), last: It);
6549	unsigned Offset = NonAffectingFileIDAdjustments[Idx];
6550	return FileID::get(V: FID.getOpaqueValue() - Offset);
6551	}
6552
6553	unsigned ASTWriter::getAdjustedNumCreatedFIDs(FileID FID) const {
6554	unsigned NumCreatedFIDs = PP->getSourceManager()
6555	.getLocalSLocEntry(Index: FID.ID)
6556	.getFile()
6557	.NumCreatedFIDs;
6558
6559	unsigned AdjustedNumCreatedFIDs = 0;
6560	for (unsigned I = FID.ID, N = I + NumCreatedFIDs; I != N; ++I)
6561	if (IsSLocAffecting[I])
6562	++AdjustedNumCreatedFIDs;
6563	return AdjustedNumCreatedFIDs;
6564	}
6565
6566	SourceLocation ASTWriter::getAdjustedLocation(SourceLocation Loc) const {
6567	if (Loc.isInvalid())
6568	return Loc;
6569	return Loc.getLocWithOffset(Offset: -getAdjustment(Offset: Loc.getOffset()));
6570	}
6571
6572	SourceRange ASTWriter::getAdjustedRange(SourceRange Range) const {
6573	return SourceRange(getAdjustedLocation(Loc: Range.getBegin()),
6574	getAdjustedLocation(Loc: Range.getEnd()));
6575	}
6576
6577	SourceLocation::UIntTy
6578	ASTWriter::getAdjustedOffset(SourceLocation::UIntTy Offset) const {
6579	return Offset - getAdjustment(Offset);
6580	}
6581
6582	SourceLocation::UIntTy
6583	ASTWriter::getAdjustment(SourceLocation::UIntTy Offset) const {
6584	if (NonAffectingRanges.empty())
6585	return 0;
6586
6587	if (PP->getSourceManager().isLoadedOffset(SLocOffset: Offset))
6588	return 0;
6589
6590	if (Offset > NonAffectingRanges.back().getEnd().getOffset())
6591	return NonAffectingOffsetAdjustments.back();
6592
6593	if (Offset < NonAffectingRanges.front().getBegin().getOffset())
6594	return 0;
6595
6596	auto Contains = [](const SourceRange &Range, SourceLocation::UIntTy Offset) {
6597	return Range.getEnd().getOffset() < Offset;
6598	};
6599
6600	auto It = llvm::lower_bound(Range: NonAffectingRanges, Value&: Offset, C: Contains);
6601	unsigned Idx = std::distance(first: NonAffectingRanges.begin(), last: It);
6602	return NonAffectingOffsetAdjustments[Idx];
6603	}
6604
6605	void ASTWriter::AddFileID(FileID FID, RecordDataImpl &Record) {
6606	Record.push_back(Elt: getAdjustedFileID(FID).getOpaqueValue());
6607	}
6608
6609	SourceLocationEncoding::RawLocEncoding
6610	ASTWriter::getRawSourceLocationEncoding(SourceLocation Loc, LocSeq *Seq) {
6611	unsigned BaseOffset = 0;
6612	unsigned ModuleFileIndex = 0;
6613
6614	// See SourceLocationEncoding.h for the encoding details.
6615	if (PP->getSourceManager().isLoadedSourceLocation(Loc) && Loc.isValid()) {
6616	assert(getChain());
6617	auto SLocMapI = getChain()->GlobalSLocOffsetMap.find(
6618	K: SourceManager::MaxLoadedOffset - Loc.getOffset() - 1);
6619	assert(SLocMapI != getChain()->GlobalSLocOffsetMap.end() &&
6620	"Corrupted global sloc offset map");
6621	ModuleFile *F = SLocMapI->second;
6622	BaseOffset = F->SLocEntryBaseOffset - 2;
6623	// 0 means the location is not loaded. So we need to add 1 to the index to
6624	// make it clear.
6625	ModuleFileIndex = F->Index + 1;
6626	assert(&getChain()->getModuleManager()[F->Index] == F);
6627	}
6628
6629	return SourceLocationEncoding::encode(Loc, BaseOffset, BaseModuleFileIndex: ModuleFileIndex, Seq);
6630	}
6631
6632	void ASTWriter::AddSourceLocation(SourceLocation Loc, RecordDataImpl &Record,
6633	SourceLocationSequence *Seq) {
6634	Loc = getAdjustedLocation(Loc);
6635	Record.push_back(Elt: getRawSourceLocationEncoding(Loc, Seq));
6636	}
6637
6638	void ASTWriter::AddSourceRange(SourceRange Range, RecordDataImpl &Record,
6639	SourceLocationSequence *Seq) {
6640	AddSourceLocation(Loc: Range.getBegin(), Record, Seq);
6641	AddSourceLocation(Loc: Range.getEnd(), Record, Seq);
6642	}
6643
6644	void ASTRecordWriter::AddAPFloat(const llvm::APFloat &Value) {
6645	AddAPInt(Value: Value.bitcastToAPInt());
6646	}
6647
6648	void ASTWriter::AddIdentifierRef(const IdentifierInfo *II, RecordDataImpl &Record) {
6649	Record.push_back(Elt: getIdentifierRef(II));
6650	}
6651
6652	IdentifierID ASTWriter::getIdentifierRef(const IdentifierInfo *II) {
6653	if (!II)
6654	return 0;
6655
6656	IdentifierID &ID = IdentifierIDs[II];
6657	if (ID == 0)
6658	ID = NextIdentID++;
6659	return ID;
6660	}
6661
6662	MacroID ASTWriter::getMacroRef(MacroInfo *MI, const IdentifierInfo *Name) {
6663	// Don't emit builtin macros like __LINE__ to the AST file unless they
6664	// have been redefined by the header (in which case they are not
6665	// isBuiltinMacro).
6666	if (!MI || MI->isBuiltinMacro())
6667	return 0;
6668
6669	MacroID &ID = MacroIDs[MI];
6670	if (ID == 0) {
6671	ID = NextMacroID++;
6672	MacroInfoToEmitData Info = { .Name: Name, .MI: MI, .ID: ID };
6673	MacroInfosToEmit.push_back(x: Info);
6674	}
6675	return ID;
6676	}
6677
6678	uint32_t ASTWriter::getMacroDirectivesOffset(const IdentifierInfo *Name) {
6679	return IdentMacroDirectivesOffsetMap.lookup(Val: Name);
6680	}
6681
6682	void ASTRecordWriter::AddSelectorRef(const Selector SelRef) {
6683	Record->push_back(Elt: Writer->getSelectorRef(Sel: SelRef));
6684	}
6685
6686	SelectorID ASTWriter::getSelectorRef(Selector Sel) {
6687	if (Sel.getAsOpaquePtr() == nullptr) {
6688	return 0;
6689	}
6690
6691	SelectorID SID = SelectorIDs[Sel];
6692	if (SID == 0 && Chain) {
6693	// This might trigger a ReadSelector callback, which will set the ID for
6694	// this selector.
6695	Chain->LoadSelector(Sel);
6696	SID = SelectorIDs[Sel];
6697	}
6698	if (SID == 0) {
6699	SID = NextSelectorID++;
6700	SelectorIDs[Sel] = SID;
6701	}
6702	return SID;
6703	}
6704
6705	void ASTRecordWriter::AddCXXTemporary(const CXXTemporary *Temp) {
6706	AddDeclRef(Temp->getDestructor());
6707	}
6708
6709	void ASTRecordWriter::AddTemplateArgumentLocInfo(
6710	TemplateArgument::ArgKind Kind, const TemplateArgumentLocInfo &Arg) {
6711	switch (Kind) {
6712	case TemplateArgument::Expression:
6713	AddStmt(Arg.getAsExpr());
6714	break;
6715	case TemplateArgument::Type:
6716	AddTypeSourceInfo(TInfo: Arg.getAsTypeSourceInfo());
6717	break;
6718	case TemplateArgument::Template:
6719	AddNestedNameSpecifierLoc(NNS: Arg.getTemplateQualifierLoc());
6720	AddSourceLocation(Loc: Arg.getTemplateNameLoc());
6721	break;
6722	case TemplateArgument::TemplateExpansion:
6723	AddNestedNameSpecifierLoc(NNS: Arg.getTemplateQualifierLoc());
6724	AddSourceLocation(Loc: Arg.getTemplateNameLoc());
6725	AddSourceLocation(Loc: Arg.getTemplateEllipsisLoc());
6726	break;
6727	case TemplateArgument::Null:
6728	case TemplateArgument::Integral:
6729	case TemplateArgument::Declaration:
6730	case TemplateArgument::NullPtr:
6731	case TemplateArgument::StructuralValue:
6732	case TemplateArgument::Pack:
6733	// FIXME: Is this right?
6734	break;
6735	}
6736	}
6737
6738	void ASTRecordWriter::AddTemplateArgumentLoc(const TemplateArgumentLoc &Arg) {
6739	AddTemplateArgument(Arg: Arg.getArgument());
6740
6741	if (Arg.getArgument().getKind() == TemplateArgument::Expression) {
6742	bool InfoHasSameExpr
6743	= Arg.getArgument().getAsExpr() == Arg.getLocInfo().getAsExpr();
6744	Record->push_back(Elt: InfoHasSameExpr);
6745	if (InfoHasSameExpr)
6746	return; // Avoid storing the same expr twice.
6747	}
6748	AddTemplateArgumentLocInfo(Kind: Arg.getArgument().getKind(), Arg: Arg.getLocInfo());
6749	}
6750
6751	void ASTRecordWriter::AddTypeSourceInfo(TypeSourceInfo *TInfo) {
6752	if (!TInfo) {
6753	AddTypeRef(T: QualType());
6754	return;
6755	}
6756
6757	AddTypeRef(T: TInfo->getType());
6758	AddTypeLoc(TL: TInfo->getTypeLoc());
6759	}
6760
6761	void ASTRecordWriter::AddTypeLoc(TypeLoc TL, LocSeq *OuterSeq) {
6762	LocSeq::State Seq(OuterSeq);
6763	TypeLocWriter TLW(*this, Seq);
6764	for (; !TL.isNull(); TL = TL.getNextTypeLoc())
6765	TLW.Visit(TyLoc: TL);
6766	}
6767
6768	void ASTWriter::AddTypeRef(ASTContext &Context, QualType T,
6769	RecordDataImpl &Record) {
6770	Record.push_back(Elt: GetOrCreateTypeID(Context, T));
6771	}
6772
6773	template <typename IdxForTypeTy>
6774	static TypeID MakeTypeID(ASTContext &Context, QualType T,
6775	IdxForTypeTy IdxForType) {
6776	if (T.isNull())
6777	return PREDEF_TYPE_NULL_ID;
6778
6779	unsigned FastQuals = T.getLocalFastQualifiers();
6780	T.removeLocalFastQualifiers();
6781
6782	if (T.hasLocalNonFastQualifiers())
6783	return IdxForType(T).asTypeID(FastQuals);
6784
6785	assert(!T.hasLocalQualifiers());
6786
6787	if (const BuiltinType *BT = dyn_cast<BuiltinType>(Val: T.getTypePtr()))
6788	return TypeIdxFromBuiltin(BT).asTypeID(FastQuals);
6789
6790	if (T == Context.AutoDeductTy)
6791	return TypeIdx(0, PREDEF_TYPE_AUTO_DEDUCT).asTypeID(FastQuals);
6792	if (T == Context.AutoRRefDeductTy)
6793	return TypeIdx(0, PREDEF_TYPE_AUTO_RREF_DEDUCT).asTypeID(FastQuals);
6794
6795	return IdxForType(T).asTypeID(FastQuals);
6796	}
6797
6798	TypeID ASTWriter::GetOrCreateTypeID(ASTContext &Context, QualType T) {
6799	return MakeTypeID(Context, T, IdxForType: [&](QualType T) -> TypeIdx {
6800	if (T.isNull())
6801	return TypeIdx();
6802	assert(!T.getLocalFastQualifiers());
6803
6804	TypeIdx &Idx = TypeIdxs[T];
6805	if (Idx.getValue() == 0) {
6806	if (DoneWritingDeclsAndTypes) {
6807	assert(0 && "New type seen after serializing all the types to emit!");
6808	return TypeIdx();
6809	}
6810
6811	// We haven't seen this type before. Assign it a new ID and put it
6812	// into the queue of types to emit.
6813	Idx = TypeIdx(0, NextTypeID++);
6814	DeclTypesToEmit.push(T);
6815	}
6816	return Idx;
6817	});
6818	}
6819
6820	void ASTWriter::AddEmittedDeclRef(const Decl *D, RecordDataImpl &Record) {
6821	if (!wasDeclEmitted(D))
6822	return;
6823
6824	AddDeclRef(D, Record);
6825	}
6826
6827	void ASTWriter::AddDeclRef(const Decl *D, RecordDataImpl &Record) {
6828	Record.push_back(Elt: GetDeclRef(D).getRawValue());
6829	}
6830
6831	LocalDeclID ASTWriter::GetDeclRef(const Decl *D) {
6832	assert(WritingAST && "Cannot request a declaration ID before AST writing");
6833
6834	if (!D) {
6835	return LocalDeclID();
6836	}
6837
6838	// If the DeclUpdate from the GMF gets touched, emit it.
6839	if (auto *Iter = DeclUpdatesFromGMF.find(Key: D);
6840	Iter != DeclUpdatesFromGMF.end()) {
6841	for (DeclUpdate &Update : Iter->second)
6842	DeclUpdates[D].push_back(Elt: Update);
6843	DeclUpdatesFromGMF.erase(Iterator: Iter);
6844	}
6845
6846	// If D comes from an AST file, its declaration ID is already known and
6847	// fixed.
6848	if (D->isFromASTFile()) {
6849	if (isWritingStdCXXNamedModules() && D->getOwningModule())
6850	TouchedTopLevelModules.insert(X: D->getOwningModule()->getTopLevelModule());
6851
6852	return LocalDeclID(D->getGlobalID());
6853	}
6854
6855	assert(!(reinterpret_cast<uintptr_t>(D) & 0x01) && "Invalid decl pointer");
6856	LocalDeclID &ID = DeclIDs[D];
6857	if (ID.isInvalid()) {
6858	if (DoneWritingDeclsAndTypes) {
6859	assert(0 && "New decl seen after serializing all the decls to emit!");
6860	return LocalDeclID();
6861	}
6862
6863	// We haven't seen this declaration before. Give it a new ID and
6864	// enqueue it in the list of declarations to emit.
6865	ID = NextDeclID++;
6866	DeclTypesToEmit.push(x: const_cast<Decl *>(D));
6867	}
6868
6869	return ID;
6870	}
6871
6872	LocalDeclID ASTWriter::getDeclID(const Decl *D) {
6873	if (!D)
6874	return LocalDeclID();
6875
6876	// If D comes from an AST file, its declaration ID is already known and
6877	// fixed.
6878	if (D->isFromASTFile())
6879	return LocalDeclID(D->getGlobalID());
6880
6881	assert(DeclIDs.contains(D) && "Declaration not emitted!");
6882	return DeclIDs[D];
6883	}
6884
6885	bool ASTWriter::wasDeclEmitted(const Decl *D) const {
6886	assert(D);
6887
6888	assert(DoneWritingDeclsAndTypes &&
6889	"wasDeclEmitted should only be called after writing declarations");
6890
6891	if (D->isFromASTFile())
6892	return true;
6893
6894	bool Emitted = DeclIDs.contains(Val: D);
6895	assert((Emitted || (!D->getOwningModule() && isWritingStdCXXNamedModules()) ||
6896	GeneratingReducedBMI) &&
6897	"The declaration within modules can only be omitted in reduced BMI.");
6898	return Emitted;
6899	}
6900
6901	void ASTWriter::associateDeclWithFile(const Decl *D, LocalDeclID ID) {
6902	assert(ID.isValid());
6903	assert(D);
6904
6905	SourceLocation Loc = D->getLocation();
6906	if (Loc.isInvalid())
6907	return;
6908
6909	// We only keep track of the file-level declarations of each file.
6910	if (!D->getLexicalDeclContext()->isFileContext())
6911	return;
6912	// FIXME: ParmVarDecls that are part of a function type of a parameter of
6913	// a function/objc method, should not have TU as lexical context.
6914	// TemplateTemplateParmDecls that are part of an alias template, should not
6915	// have TU as lexical context.
6916	if (isa<ParmVarDecl, TemplateTemplateParmDecl>(Val: D))
6917	return;
6918
6919	SourceManager &SM = PP->getSourceManager();
6920	SourceLocation FileLoc = SM.getFileLoc(Loc);
6921	assert(SM.isLocalSourceLocation(FileLoc));
6922	FileID FID;
6923	unsigned Offset;
6924	std::tie(args&: FID, args&: Offset) = SM.getDecomposedLoc(Loc: FileLoc);
6925	if (FID.isInvalid())
6926	return;
6927	assert(SM.getSLocEntry(FID).isFile());
6928	assert(IsSLocAffecting[FID.ID]);
6929
6930	std::unique_ptr<DeclIDInFileInfo> &Info = FileDeclIDs[FID];
6931	if (!Info)
6932	Info = std::make_unique<DeclIDInFileInfo>();
6933
6934	std::pair<unsigned, LocalDeclID> LocDecl(Offset, ID);
6935	LocDeclIDsTy &Decls = Info->DeclIDs;
6936	Decls.push_back(Elt: LocDecl);
6937	}
6938
6939	unsigned ASTWriter::getAnonymousDeclarationNumber(const NamedDecl *D) {
6940	assert(needsAnonymousDeclarationNumber(D) &&
6941	"expected an anonymous declaration");
6942
6943	// Number the anonymous declarations within this context, if we've not
6944	// already done so.
6945	auto It = AnonymousDeclarationNumbers.find(D);
6946	if (It == AnonymousDeclarationNumbers.end()) {
6947	auto *DC = D->getLexicalDeclContext();
6948	numberAnonymousDeclsWithin(DC, [&](const NamedDecl *ND, unsigned Number) {
6949	AnonymousDeclarationNumbers[ND] = Number;
6950	});
6951
6952	It = AnonymousDeclarationNumbers.find(D);
6953	assert(It != AnonymousDeclarationNumbers.end() &&
6954	"declaration not found within its lexical context");
6955	}
6956
6957	return It->second;
6958	}
6959
6960	void ASTRecordWriter::AddDeclarationNameLoc(const DeclarationNameLoc &DNLoc,
6961	DeclarationName Name) {
6962	switch (Name.getNameKind()) {
6963	case DeclarationName::CXXConstructorName:
6964	case DeclarationName::CXXDestructorName:
6965	case DeclarationName::CXXConversionFunctionName:
6966	AddTypeSourceInfo(TInfo: DNLoc.getNamedTypeInfo());
6967	break;
6968
6969	case DeclarationName::CXXOperatorName:
6970	AddSourceRange(Range: DNLoc.getCXXOperatorNameRange());
6971	break;
6972
6973	case DeclarationName::CXXLiteralOperatorName:
6974	AddSourceLocation(Loc: DNLoc.getCXXLiteralOperatorNameLoc());
6975	break;
6976
6977	case DeclarationName::Identifier:
6978	case DeclarationName::ObjCZeroArgSelector:
6979	case DeclarationName::ObjCOneArgSelector:
6980	case DeclarationName::ObjCMultiArgSelector:
6981	case DeclarationName::CXXUsingDirective:
6982	case DeclarationName::CXXDeductionGuideName:
6983	break;
6984	}
6985	}
6986
6987	void ASTRecordWriter::AddDeclarationNameInfo(
6988	const DeclarationNameInfo &NameInfo) {
6989	AddDeclarationName(Name: NameInfo.getName());
6990	AddSourceLocation(Loc: NameInfo.getLoc());
6991	AddDeclarationNameLoc(DNLoc: NameInfo.getInfo(), Name: NameInfo.getName());
6992	}
6993
6994	void ASTRecordWriter::AddQualifierInfo(const QualifierInfo &Info) {
6995	AddNestedNameSpecifierLoc(NNS: Info.QualifierLoc);
6996	Record->push_back(Elt: Info.NumTemplParamLists);
6997	for (unsigned i = 0, e = Info.NumTemplParamLists; i != e; ++i)
6998	AddTemplateParameterList(TemplateParams: Info.TemplParamLists[i]);
6999	}
7000
7001	void ASTRecordWriter::AddNestedNameSpecifierLoc(NestedNameSpecifierLoc NNS) {
7002	// Nested name specifiers usually aren't too long. I think that 8 would
7003	// typically accommodate the vast majority.
7004	SmallVector<NestedNameSpecifierLoc , 8> NestedNames;
7005
7006	// Push each of the nested-name-specifiers's onto a stack for
7007	// serialization in reverse order.
7008	while (NNS) {
7009	NestedNames.push_back(Elt: NNS);
7010	NNS = NNS.getPrefix();
7011	}
7012
7013	Record->push_back(Elt: NestedNames.size());
7014	while(!NestedNames.empty()) {
7015	NNS = NestedNames.pop_back_val();
7016	NestedNameSpecifier::SpecifierKind Kind
7017	= NNS.getNestedNameSpecifier()->getKind();
7018	Record->push_back(Elt: Kind);
7019	switch (Kind) {
7020	case NestedNameSpecifier::Identifier:
7021	AddIdentifierRef(II: NNS.getNestedNameSpecifier()->getAsIdentifier());
7022	AddSourceRange(Range: NNS.getLocalSourceRange());
7023	break;
7024
7025	case NestedNameSpecifier::Namespace:
7026	AddDeclRef(NNS.getNestedNameSpecifier()->getAsNamespace());
7027	AddSourceRange(Range: NNS.getLocalSourceRange());
7028	break;
7029
7030	case NestedNameSpecifier::NamespaceAlias:
7031	AddDeclRef(NNS.getNestedNameSpecifier()->getAsNamespaceAlias());
7032	AddSourceRange(Range: NNS.getLocalSourceRange());
7033	break;
7034
7035	case NestedNameSpecifier::TypeSpec:
7036	AddTypeRef(T: NNS.getTypeLoc().getType());
7037	AddTypeLoc(TL: NNS.getTypeLoc());
7038	AddSourceLocation(Loc: NNS.getLocalSourceRange().getEnd());
7039	break;
7040
7041	case NestedNameSpecifier::Global:
7042	AddSourceLocation(Loc: NNS.getLocalSourceRange().getEnd());
7043	break;
7044
7045	case NestedNameSpecifier::Super:
7046	AddDeclRef(NNS.getNestedNameSpecifier()->getAsRecordDecl());
7047	AddSourceRange(Range: NNS.getLocalSourceRange());
7048	break;
7049	}
7050	}
7051	}
7052
7053	void ASTRecordWriter::AddTemplateParameterList(
7054	const TemplateParameterList *TemplateParams) {
7055	assert(TemplateParams && "No TemplateParams!");
7056	AddSourceLocation(Loc: TemplateParams->getTemplateLoc());
7057	AddSourceLocation(Loc: TemplateParams->getLAngleLoc());
7058	AddSourceLocation(Loc: TemplateParams->getRAngleLoc());
7059
7060	Record->push_back(Elt: TemplateParams->size());
7061	for (const auto &P : *TemplateParams)
7062	AddDeclRef(P);
7063	if (const Expr *RequiresClause = TemplateParams->getRequiresClause()) {
7064	Record->push_back(Elt: true);
7065	writeStmtRef(RequiresClause);
7066	} else {
7067	Record->push_back(Elt: false);
7068	}
7069	}
7070
7071	/// Emit a template argument list.
7072	void ASTRecordWriter::AddTemplateArgumentList(
7073	const TemplateArgumentList *TemplateArgs) {
7074	assert(TemplateArgs && "No TemplateArgs!");
7075	Record->push_back(Elt: TemplateArgs->size());
7076	for (int i = 0, e = TemplateArgs->size(); i != e; ++i)
7077	AddTemplateArgument(Arg: TemplateArgs->get(Idx: i));
7078	}
7079
7080	void ASTRecordWriter::AddASTTemplateArgumentListInfo(
7081	const ASTTemplateArgumentListInfo *ASTTemplArgList) {
7082	assert(ASTTemplArgList && "No ASTTemplArgList!");
7083	AddSourceLocation(Loc: ASTTemplArgList->LAngleLoc);
7084	AddSourceLocation(Loc: ASTTemplArgList->RAngleLoc);
7085	Record->push_back(Elt: ASTTemplArgList->NumTemplateArgs);
7086	const TemplateArgumentLoc *TemplArgs = ASTTemplArgList->getTemplateArgs();
7087	for (int i = 0, e = ASTTemplArgList->NumTemplateArgs; i != e; ++i)
7088	AddTemplateArgumentLoc(Arg: TemplArgs[i]);
7089	}
7090
7091	void ASTRecordWriter::AddUnresolvedSet(const ASTUnresolvedSet &Set) {
7092	Record->push_back(Elt: Set.size());
7093	for (ASTUnresolvedSet::const_iterator
7094	I = Set.begin(), E = Set.end(); I != E; ++I) {
7095	AddDeclRef(I.getDecl());
7096	Record->push_back(Elt: I.getAccess());
7097	}
7098	}
7099
7100	// FIXME: Move this out of the main ASTRecordWriter interface.
7101	void ASTRecordWriter::AddCXXBaseSpecifier(const CXXBaseSpecifier &Base) {
7102	Record->push_back(Elt: Base.isVirtual());
7103	Record->push_back(Elt: Base.isBaseOfClass());
7104	Record->push_back(Elt: Base.getAccessSpecifierAsWritten());
7105	Record->push_back(Elt: Base.getInheritConstructors());
7106	AddTypeSourceInfo(TInfo: Base.getTypeSourceInfo());
7107	AddSourceRange(Range: Base.getSourceRange());
7108	AddSourceLocation(Loc: Base.isPackExpansion()? Base.getEllipsisLoc()
7109	: SourceLocation());
7110	}
7111
7112	static uint64_t EmitCXXBaseSpecifiers(ASTContext &Context, ASTWriter &W,
7113	ArrayRef<CXXBaseSpecifier> Bases) {
7114	ASTWriter::RecordData Record;
7115	ASTRecordWriter Writer(Context, W, Record);
7116	Writer.push_back(N: Bases.size());
7117
7118	for (auto &Base : Bases)
7119	Writer.AddCXXBaseSpecifier(Base);
7120
7121	return Writer.Emit(Code: serialization::DECL_CXX_BASE_SPECIFIERS);
7122	}
7123
7124	// FIXME: Move this out of the main ASTRecordWriter interface.
7125	void ASTRecordWriter::AddCXXBaseSpecifiers(ArrayRef<CXXBaseSpecifier> Bases) {
7126	AddOffset(BitOffset: EmitCXXBaseSpecifiers(getASTContext(), *Writer, Bases));
7127	}
7128
7129	static uint64_t
7130	EmitCXXCtorInitializers(ASTContext &Context, ASTWriter &W,
7131	ArrayRef<CXXCtorInitializer *> CtorInits) {
7132	ASTWriter::RecordData Record;
7133	ASTRecordWriter Writer(Context, W, Record);
7134	Writer.push_back(N: CtorInits.size());
7135
7136	for (auto *Init : CtorInits) {
7137	if (Init->isBaseInitializer()) {
7138	Writer.push_back(N: CTOR_INITIALIZER_BASE);
7139	Writer.AddTypeSourceInfo(TInfo: Init->getTypeSourceInfo());
7140	Writer.push_back(N: Init->isBaseVirtual());
7141	} else if (Init->isDelegatingInitializer()) {
7142	Writer.push_back(N: CTOR_INITIALIZER_DELEGATING);
7143	Writer.AddTypeSourceInfo(TInfo: Init->getTypeSourceInfo());
7144	} else if (Init->isMemberInitializer()){
7145	Writer.push_back(N: CTOR_INITIALIZER_MEMBER);
7146	Writer.AddDeclRef(Init->getMember());
7147	} else {
7148	Writer.push_back(N: CTOR_INITIALIZER_INDIRECT_MEMBER);
7149	Writer.AddDeclRef(Init->getIndirectMember());
7150	}
7151
7152	Writer.AddSourceLocation(Loc: Init->getMemberLocation());
7153	Writer.AddStmt(Init->getInit());
7154	Writer.AddSourceLocation(Loc: Init->getLParenLoc());
7155	Writer.AddSourceLocation(Loc: Init->getRParenLoc());
7156	Writer.push_back(N: Init->isWritten());
7157	if (Init->isWritten())
7158	Writer.push_back(N: Init->getSourceOrder());
7159	}
7160
7161	return Writer.Emit(Code: serialization::DECL_CXX_CTOR_INITIALIZERS);
7162	}
7163
7164	// FIXME: Move this out of the main ASTRecordWriter interface.
7165	void ASTRecordWriter::AddCXXCtorInitializers(
7166	ArrayRef<CXXCtorInitializer *> CtorInits) {
7167	AddOffset(BitOffset: EmitCXXCtorInitializers(getASTContext(), *Writer, CtorInits));
7168	}
7169
7170	void ASTRecordWriter::AddCXXDefinitionData(const CXXRecordDecl *D) {
7171	auto &Data = D->data();
7172
7173	Record->push_back(Elt: Data.IsLambda);
7174
7175	BitsPacker DefinitionBits;
7176
7177	#define FIELD(Name, Width, Merge) \
7178	if (!DefinitionBits.canWriteNextNBits(Width)) { \
7179	Record->push_back(DefinitionBits); \
7180	DefinitionBits.reset(0); \
7181	} \
7182	DefinitionBits.addBits(Data.Name, Width);
7183
7184	#include "clang/AST/CXXRecordDeclDefinitionBits.def"
7185	#undef FIELD
7186
7187	Record->push_back(Elt: DefinitionBits);
7188
7189	// getODRHash will compute the ODRHash if it has not been previously
7190	// computed.
7191	Record->push_back(Elt: D->getODRHash());
7192
7193	bool ModulesCodegen =
7194	!D->isDependentType() &&
7195	D->getTemplateSpecializationKind() !=
7196	TSK_ExplicitInstantiationDeclaration &&
7197	(Writer->getLangOpts().ModulesDebugInfo || D->isInNamedModule());
7198	Record->push_back(Elt: ModulesCodegen);
7199	if (ModulesCodegen)
7200	Writer->AddDeclRef(D, Writer->ModularCodegenDecls);
7201
7202	// IsLambda bit is already saved.
7203
7204	AddUnresolvedSet(Set: Data.Conversions.get(C&: getASTContext()));
7205	Record->push_back(Elt: Data.ComputedVisibleConversions);
7206	if (Data.ComputedVisibleConversions)
7207	AddUnresolvedSet(Set: Data.VisibleConversions.get(C&: getASTContext()));
7208	// Data.Definition is the owning decl, no need to write it.
7209
7210	if (!Data.IsLambda) {
7211	Record->push_back(Elt: Data.NumBases);
7212	if (Data.NumBases > 0)
7213	AddCXXBaseSpecifiers(Bases: Data.bases());
7214
7215	// FIXME: Make VBases lazily computed when needed to avoid storing them.
7216	Record->push_back(Elt: Data.NumVBases);
7217	if (Data.NumVBases > 0)
7218	AddCXXBaseSpecifiers(Bases: Data.vbases());
7219
7220	AddDeclRef(D->getFirstFriend());
7221	} else {
7222	auto &Lambda = D->getLambdaData();
7223
7224	BitsPacker LambdaBits;
7225	LambdaBits.addBits(Value: Lambda.DependencyKind, /*Width=*/BitsWidth: 2);
7226	LambdaBits.addBit(Value: Lambda.IsGenericLambda);
7227	LambdaBits.addBits(Value: Lambda.CaptureDefault, /*Width=*/BitsWidth: 2);
7228	LambdaBits.addBits(Value: Lambda.NumCaptures, /*Width=*/BitsWidth: 15);
7229	LambdaBits.addBit(Value: Lambda.HasKnownInternalLinkage);
7230	Record->push_back(Elt: LambdaBits);
7231
7232	Record->push_back(Elt: Lambda.NumExplicitCaptures);
7233	Record->push_back(Elt: Lambda.ManglingNumber);
7234	Record->push_back(Elt: D->getDeviceLambdaManglingNumber());
7235	// The lambda context declaration and index within the context are provided
7236	// separately, so that they can be used for merging.
7237	AddTypeSourceInfo(TInfo: Lambda.MethodTyInfo);
7238	for (unsigned I = 0, N = Lambda.NumCaptures; I != N; ++I) {
7239	const LambdaCapture &Capture = Lambda.Captures.front()[I];
7240	AddSourceLocation(Loc: Capture.getLocation());
7241
7242	BitsPacker CaptureBits;
7243	CaptureBits.addBit(Value: Capture.isImplicit());
7244	CaptureBits.addBits(Value: Capture.getCaptureKind(), /*Width=*/BitsWidth: 3);
7245	Record->push_back(Elt: CaptureBits);
7246
7247	switch (Capture.getCaptureKind()) {
7248	case LCK_StarThis:
7249	case LCK_This:
7250	case LCK_VLAType:
7251	break;
7252	case LCK_ByCopy:
7253	case LCK_ByRef:
7254	ValueDecl *Var =
7255	Capture.capturesVariable() ? Capture.getCapturedVar() : nullptr;
7256	AddDeclRef(Var);
7257	AddSourceLocation(Loc: Capture.isPackExpansion() ? Capture.getEllipsisLoc()
7258	: SourceLocation());
7259	break;
7260	}
7261	}
7262	}
7263	}
7264
7265	void ASTRecordWriter::AddVarDeclInit(const VarDecl *VD) {
7266	const Expr *Init = VD->getInit();
7267	if (!Init) {
7268	push_back(N: 0);
7269	return;
7270	}
7271
7272	uint64_t Val = 1;
7273	if (EvaluatedStmt *ES = VD->getEvaluatedStmt()) {
7274	Val |= (ES->HasConstantInitialization ? 2 : 0);
7275	Val |= (ES->HasConstantDestruction ? 4 : 0);
7276	APValue *Evaluated = VD->getEvaluatedValue();
7277	// If the evaluated result is constant, emit it.
7278	if (Evaluated && (Evaluated->isInt() || Evaluated->isFloat()))
7279	Val |= 8;
7280	}
7281	push_back(N: Val);
7282	if (Val & 8) {
7283	AddAPValue(Value: *VD->getEvaluatedValue());
7284	}
7285
7286	writeStmtRef(Init);
7287	}
7288
7289	void ASTWriter::ReaderInitialized(ASTReader *Reader) {
7290	assert(Reader && "Cannot remove chain");
7291	assert((!Chain || Chain == Reader) && "Cannot replace chain");
7292	assert(FirstDeclID == NextDeclID &&
7293	FirstTypeID == NextTypeID &&
7294	FirstIdentID == NextIdentID &&
7295	FirstMacroID == NextMacroID &&
7296	FirstSubmoduleID == NextSubmoduleID &&
7297	FirstSelectorID == NextSelectorID &&
7298	"Setting chain after writing has started.");
7299
7300	Chain = Reader;
7301
7302	// Note, this will get called multiple times, once one the reader starts up
7303	// and again each time it's done reading a PCH or module.
7304	FirstMacroID = NUM_PREDEF_MACRO_IDS + Chain->getTotalNumMacros();
7305	FirstSubmoduleID = NUM_PREDEF_SUBMODULE_IDS + Chain->getTotalNumSubmodules();
7306	FirstSelectorID = NUM_PREDEF_SELECTOR_IDS + Chain->getTotalNumSelectors();
7307	NextMacroID = FirstMacroID;
7308	NextSelectorID = FirstSelectorID;
7309	NextSubmoduleID = FirstSubmoduleID;
7310	}
7311
7312	void ASTWriter::IdentifierRead(IdentifierID ID, IdentifierInfo *II) {
7313	// Don't reuse Type ID from external modules for named modules. See the
7314	// comments in WriteASTCore for details.
7315	if (isWritingStdCXXNamedModules())
7316	return;
7317
7318	IdentifierID &StoredID = IdentifierIDs[II];
7319	unsigned OriginalModuleFileIndex = StoredID >> 32;
7320
7321	// Always keep the local identifier ID. See \p TypeRead() for more
7322	// information.
7323	if (OriginalModuleFileIndex == 0 && StoredID)
7324	return;
7325
7326	// Otherwise, keep the highest ID since the module file comes later has
7327	// higher module file indexes.
7328	if (ID > StoredID)
7329	StoredID = ID;
7330	}
7331
7332	void ASTWriter::MacroRead(serialization::MacroID ID, MacroInfo *MI) {
7333	// Always keep the highest ID. See \p TypeRead() for more information.
7334	MacroID &StoredID = MacroIDs[MI];
7335	if (ID > StoredID)
7336	StoredID = ID;
7337	}
7338
7339	void ASTWriter::TypeRead(TypeIdx Idx, QualType T) {
7340	// Don't reuse Type ID from external modules for named modules. See the
7341	// comments in WriteASTCore for details.
7342	if (isWritingStdCXXNamedModules())
7343	return;
7344
7345	// Always take the type index that comes in later module files.
7346	// This copes with an interesting
7347	// case for chained AST writing where we schedule writing the type and then,
7348	// later, deserialize the type from another AST. In this case, we want to
7349	// keep the entry from a later module so that we can properly write it out to
7350	// the AST file.
7351	TypeIdx &StoredIdx = TypeIdxs[T];
7352
7353	// Ignore it if the type comes from the current being written module file.
7354	// Since the current module file being written logically has the highest
7355	// index.
7356	unsigned ModuleFileIndex = StoredIdx.getModuleFileIndex();
7357	if (ModuleFileIndex == 0 && StoredIdx.getValue())
7358	return;
7359
7360	// Otherwise, keep the highest ID since the module file comes later has
7361	// higher module file indexes.
7362	if (Idx.getModuleFileIndex() >= StoredIdx.getModuleFileIndex())
7363	StoredIdx = Idx;
7364	}
7365
7366	void ASTWriter::PredefinedDeclBuilt(PredefinedDeclIDs ID, const Decl *D) {
7367	assert(D->isCanonicalDecl() && "predefined decl is not canonical");
7368	DeclIDs[D] = LocalDeclID(ID);
7369	PredefinedDecls.insert(Ptr: D);
7370	}
7371
7372	void ASTWriter::SelectorRead(SelectorID ID, Selector S) {
7373	// Always keep the highest ID. See \p TypeRead() for more information.
7374	SelectorID &StoredID = SelectorIDs[S];
7375	if (ID > StoredID)
7376	StoredID = ID;
7377	}
7378
7379	void ASTWriter::MacroDefinitionRead(serialization::PreprocessedEntityID ID,
7380	MacroDefinitionRecord *MD) {
7381	assert(!MacroDefinitions.contains(MD));
7382	MacroDefinitions[MD] = ID;
7383	}
7384
7385	void ASTWriter::ModuleRead(serialization::SubmoduleID ID, Module *Mod) {
7386	assert(!SubmoduleIDs.contains(Mod));
7387	SubmoduleIDs[Mod] = ID;
7388	}
7389
7390	void ASTWriter::CompletedTagDefinition(const TagDecl *D) {
7391	if (Chain && Chain->isProcessingUpdateRecords()) return;
7392	assert(D->isCompleteDefinition());
7393	assert(!WritingAST && "Already writing the AST!");
7394	if (auto *RD = dyn_cast<CXXRecordDecl>(Val: D)) {
7395	// We are interested when a PCH decl is modified.
7396	if (RD->isFromASTFile()) {
7397	// A forward reference was mutated into a definition. Rewrite it.
7398	// FIXME: This happens during template instantiation, should we
7399	// have created a new definition decl instead ?
7400	assert(isTemplateInstantiation(RD->getTemplateSpecializationKind()) &&
7401	"completed a tag from another module but not by instantiation?");
7402	DeclUpdates[RD].push_back(
7403	DeclUpdate(DeclUpdateKind::CXXInstantiatedClassDefinition));
7404	}
7405	}
7406	}
7407
7408	static bool isImportedDeclContext(ASTReader *Chain, const Decl *D) {
7409	if (D->isFromASTFile())
7410	return true;
7411
7412	// The predefined __va_list_tag struct is imported if we imported any decls.
7413	// FIXME: This is a gross hack.
7414	return D == D->getASTContext().getVaListTagDecl();
7415	}
7416
7417	void ASTWriter::AddedVisibleDecl(const DeclContext *DC, const Decl *D) {
7418	if (Chain && Chain->isProcessingUpdateRecords()) return;
7419	assert(DC->isLookupContext() &&
7420	"Should not add lookup results to non-lookup contexts!");
7421
7422	// TU is handled elsewhere.
7423	if (isa<TranslationUnitDecl>(Val: DC))
7424	return;
7425
7426	// Namespaces are handled elsewhere, except for template instantiations of
7427	// FunctionTemplateDecls in namespaces. We are interested in cases where the
7428	// local instantiations are added to an imported context. Only happens when
7429	// adding ADL lookup candidates, for example templated friends.
7430	if (isa<NamespaceDecl>(Val: DC) && D->getFriendObjectKind() == Decl::FOK_None &&
7431	!isa<FunctionTemplateDecl>(Val: D))
7432	return;
7433
7434	// We're only interested in cases where a local declaration is added to an
7435	// imported context.
7436	if (D->isFromASTFile() || !isImportedDeclContext(Chain, D: cast<Decl>(Val: DC)))
7437	return;
7438
7439	assert(DC == DC->getPrimaryContext() && "added to non-primary context");
7440	assert(!getDefinitiveDeclContext(DC) && "DeclContext not definitive!");
7441	assert(!WritingAST && "Already writing the AST!");
7442	if (UpdatedDeclContexts.insert(X: DC) && !cast<Decl>(Val: DC)->isFromASTFile()) {
7443	// We're adding a visible declaration to a predefined decl context. Ensure
7444	// that we write out all of its lookup results so we don't get a nasty
7445	// surprise when we try to emit its lookup table.
7446	llvm::append_range(C&: DeclsToEmitEvenIfUnreferenced, R: DC->decls());
7447	}
7448	DeclsToEmitEvenIfUnreferenced.push_back(Elt: D);
7449	}
7450
7451	void ASTWriter::AddedCXXImplicitMember(const CXXRecordDecl *RD, const Decl *D) {
7452	if (Chain && Chain->isProcessingUpdateRecords()) return;
7453	assert(D->isImplicit());
7454
7455	// We're only interested in cases where a local declaration is added to an
7456	// imported context.
7457	if (D->isFromASTFile() || !isImportedDeclContext(Chain, RD))
7458	return;
7459
7460	if (!isa<CXXMethodDecl>(Val: D))
7461	return;
7462
7463	// A decl coming from PCH was modified.
7464	assert(RD->isCompleteDefinition());
7465	assert(!WritingAST && "Already writing the AST!");
7466	DeclUpdates[RD].push_back(
7467	DeclUpdate(DeclUpdateKind::CXXAddedImplicitMember, D));
7468	}
7469
7470	void ASTWriter::ResolvedExceptionSpec(const FunctionDecl *FD) {
7471	if (Chain && Chain->isProcessingUpdateRecords()) return;
7472	assert(!DoneWritingDeclsAndTypes && "Already done writing updates!");
7473	if (!Chain) return;
7474	Chain->forEachImportedKeyDecl(FD, [&](const Decl *D) {
7475	// If we don't already know the exception specification for this redecl
7476	// chain, add an update record for it.
7477	if (isUnresolvedExceptionSpec(cast<FunctionDecl>(Val: D)
7478	->getType()
7479	->castAs<FunctionProtoType>()
7480	->getExceptionSpecType()))
7481	DeclUpdates[D].push_back(Elt: DeclUpdateKind::CXXResolvedExceptionSpec);
7482	});
7483	}
7484
7485	void ASTWriter::DeducedReturnType(const FunctionDecl *FD, QualType ReturnType) {
7486	if (Chain && Chain->isProcessingUpdateRecords()) return;
7487	assert(!WritingAST && "Already writing the AST!");
7488	if (!Chain) return;
7489	Chain->forEachImportedKeyDecl(FD, [&](const Decl *D) {
7490	DeclUpdates[D].push_back(
7491	Elt: DeclUpdate(DeclUpdateKind::CXXDeducedReturnType, ReturnType));
7492	});
7493	}
7494
7495	void ASTWriter::ResolvedOperatorDelete(const CXXDestructorDecl *DD,
7496	const FunctionDecl *Delete,
7497	Expr *ThisArg) {
7498	if (Chain && Chain->isProcessingUpdateRecords()) return;
7499	assert(!WritingAST && "Already writing the AST!");
7500	assert(Delete && "Not given an operator delete");
7501	if (!Chain) return;
7502	Chain->forEachImportedKeyDecl(DD, [&](const Decl *D) {
7503	DeclUpdates[D].push_back(
7504	Elt: DeclUpdate(DeclUpdateKind::CXXResolvedDtorDelete, Delete));
7505	});
7506	}
7507
7508	void ASTWriter::CompletedImplicitDefinition(const FunctionDecl *D) {
7509	if (Chain && Chain->isProcessingUpdateRecords()) return;
7510	assert(!WritingAST && "Already writing the AST!");
7511	if (!D->isFromASTFile())
7512	return; // Declaration not imported from PCH.
7513
7514	// The function definition may not have a body due to parsing errors.
7515	if (!D->doesThisDeclarationHaveABody())
7516	return;
7517
7518	// Implicit function decl from a PCH was defined.
7519	DeclUpdates[D].push_back(
7520	DeclUpdate(DeclUpdateKind::CXXAddedFunctionDefinition));
7521	}
7522
7523	void ASTWriter::VariableDefinitionInstantiated(const VarDecl *D) {
7524	if (Chain && Chain->isProcessingUpdateRecords()) return;
7525	assert(!WritingAST && "Already writing the AST!");
7526	if (!D->isFromASTFile())
7527	return;
7528
7529	DeclUpdates[D].push_back(DeclUpdate(DeclUpdateKind::CXXAddedVarDefinition));
7530	}
7531
7532	void ASTWriter::FunctionDefinitionInstantiated(const FunctionDecl *D) {
7533	if (Chain && Chain->isProcessingUpdateRecords()) return;
7534	assert(!WritingAST && "Already writing the AST!");
7535	if (!D->isFromASTFile())
7536	return;
7537
7538	// The function definition may not have a body due to parsing errors.
7539	if (!D->doesThisDeclarationHaveABody())
7540	return;
7541
7542	DeclUpdates[D].push_back(
7543	DeclUpdate(DeclUpdateKind::CXXAddedFunctionDefinition));
7544	}
7545
7546	void ASTWriter::InstantiationRequested(const ValueDecl *D) {
7547	if (Chain && Chain->isProcessingUpdateRecords()) return;
7548	assert(!WritingAST && "Already writing the AST!");
7549	if (!D->isFromASTFile())
7550	return;
7551
7552	// Since the actual instantiation is delayed, this really means that we need
7553	// to update the instantiation location.
7554	SourceLocation POI;
7555	if (auto *VD = dyn_cast<VarDecl>(Val: D))
7556	POI = VD->getPointOfInstantiation();
7557	else
7558	POI = cast<FunctionDecl>(Val: D)->getPointOfInstantiation();
7559	DeclUpdates[D].push_back(
7560	DeclUpdate(DeclUpdateKind::CXXPointOfInstantiation, POI));
7561	}
7562
7563	void ASTWriter::DefaultArgumentInstantiated(const ParmVarDecl *D) {
7564	if (Chain && Chain->isProcessingUpdateRecords()) return;
7565	assert(!WritingAST && "Already writing the AST!");
7566	if (!D->isFromASTFile())
7567	return;
7568
7569	DeclUpdates[D].push_back(
7570	DeclUpdate(DeclUpdateKind::CXXInstantiatedDefaultArgument, D));
7571	}
7572
7573	void ASTWriter::DefaultMemberInitializerInstantiated(const FieldDecl *D) {
7574	assert(!WritingAST && "Already writing the AST!");
7575	if (!D->isFromASTFile())
7576	return;
7577
7578	DeclUpdates[D].push_back(
7579	DeclUpdate(DeclUpdateKind::CXXInstantiatedDefaultMemberInitializer, D));
7580	}
7581
7582	void ASTWriter::AddedObjCCategoryToInterface(const ObjCCategoryDecl *CatD,
7583	const ObjCInterfaceDecl *IFD) {
7584	if (Chain && Chain->isProcessingUpdateRecords()) return;
7585	assert(!WritingAST && "Already writing the AST!");
7586	if (!IFD->isFromASTFile())
7587	return; // Declaration not imported from PCH.
7588
7589	assert(IFD->getDefinition() && "Category on a class without a definition?");
7590	ObjCClassesWithCategories.insert(
7591	X: const_cast<ObjCInterfaceDecl *>(IFD->getDefinition()));
7592	}
7593
7594	void ASTWriter::DeclarationMarkedUsed(const Decl *D) {
7595	if (Chain && Chain->isProcessingUpdateRecords()) return;
7596	assert(!WritingAST && "Already writing the AST!");
7597
7598	// If there is *any* declaration of the entity that's not from an AST file,
7599	// we can skip writing the update record. We make sure that isUsed() triggers
7600	// completion of the redeclaration chain of the entity.
7601	for (auto Prev = D->getMostRecentDecl(); Prev; Prev = Prev->getPreviousDecl())
7602	if (IsLocalDecl(D: Prev))
7603	return;
7604
7605	DeclUpdates[D].push_back(Elt: DeclUpdate(DeclUpdateKind::DeclMarkedUsed));
7606	}
7607
7608	void ASTWriter::DeclarationMarkedOpenMPThreadPrivate(const Decl *D) {
7609	if (Chain && Chain->isProcessingUpdateRecords()) return;
7610	assert(!WritingAST && "Already writing the AST!");
7611	if (!D->isFromASTFile())
7612	return;
7613
7614	DeclUpdates[D].push_back(
7615	Elt: DeclUpdate(DeclUpdateKind::DeclMarkedOpenMPThreadPrivate));
7616	}
7617
7618	void ASTWriter::DeclarationMarkedOpenMPAllocate(const Decl *D, const Attr *A) {
7619	if (Chain && Chain->isProcessingUpdateRecords()) return;
7620	assert(!WritingAST && "Already writing the AST!");
7621	if (!D->isFromASTFile())
7622	return;
7623
7624	DeclUpdates[D].push_back(
7625	Elt: DeclUpdate(DeclUpdateKind::DeclMarkedOpenMPAllocate, A));
7626	}
7627
7628	void ASTWriter::DeclarationMarkedOpenMPDeclareTarget(const Decl *D,
7629	const Attr *Attr) {
7630	if (Chain && Chain->isProcessingUpdateRecords()) return;
7631	assert(!WritingAST && "Already writing the AST!");
7632	if (!D->isFromASTFile())
7633	return;
7634
7635	DeclUpdates[D].push_back(
7636	Elt: DeclUpdate(DeclUpdateKind::DeclMarkedOpenMPDeclareTarget, Attr));
7637	}
7638
7639	void ASTWriter::RedefinedHiddenDefinition(const NamedDecl *D, Module *M) {
7640	if (Chain && Chain->isProcessingUpdateRecords()) return;
7641	assert(!WritingAST && "Already writing the AST!");
7642	assert(!D->isUnconditionallyVisible() && "expected a hidden declaration");
7643	DeclUpdates[D].push_back(DeclUpdate(DeclUpdateKind::DeclExported, M));
7644	}
7645
7646	void ASTWriter::AddedAttributeToRecord(const Attr *Attr,
7647	const RecordDecl *Record) {
7648	if (Chain && Chain->isProcessingUpdateRecords()) return;
7649	assert(!WritingAST && "Already writing the AST!");
7650	if (!Record->isFromASTFile())
7651	return;
7652	DeclUpdates[Record].push_back(
7653	DeclUpdate(DeclUpdateKind::AddedAttrToRecord, Attr));
7654	}
7655
7656	void ASTWriter::AddedCXXTemplateSpecialization(
7657	const ClassTemplateDecl *TD, const ClassTemplateSpecializationDecl *D) {
7658	assert(!WritingAST && "Already writing the AST!");
7659
7660	if (!TD->getFirstDecl()->isFromASTFile())
7661	return;
7662	if (Chain && Chain->isProcessingUpdateRecords())
7663	return;
7664
7665	DeclsToEmitEvenIfUnreferenced.push_back(D);
7666	}
7667
7668	void ASTWriter::AddedCXXTemplateSpecialization(
7669	const VarTemplateDecl *TD, const VarTemplateSpecializationDecl *D) {
7670	assert(!WritingAST && "Already writing the AST!");
7671
7672	if (!TD->getFirstDecl()->isFromASTFile())
7673	return;
7674	if (Chain && Chain->isProcessingUpdateRecords())
7675	return;
7676
7677	DeclsToEmitEvenIfUnreferenced.push_back(D);
7678	}
7679
7680	void ASTWriter::AddedCXXTemplateSpecialization(const FunctionTemplateDecl *TD,
7681	const FunctionDecl *D) {
7682	assert(!WritingAST && "Already writing the AST!");
7683
7684	if (!TD->getFirstDecl()->isFromASTFile())
7685	return;
7686	if (Chain && Chain->isProcessingUpdateRecords())
7687	return;
7688
7689	DeclsToEmitEvenIfUnreferenced.push_back(D);
7690	}
7691
7692	//===----------------------------------------------------------------------===//
7693	//// OMPClause Serialization
7694	////===----------------------------------------------------------------------===//
7695
7696	namespace {
7697
7698	class OMPClauseWriter : public OMPClauseVisitor<OMPClauseWriter> {
7699	ASTRecordWriter &Record;
7700
7701	public:
7702	OMPClauseWriter(ASTRecordWriter &Record) : Record(Record) {}
7703	#define GEN_CLANG_CLAUSE_CLASS
7704	#define CLAUSE_CLASS(Enum, Str, Class) void Visit##Class(Class *S);
7705	#include "llvm/Frontend/OpenMP/OMP.inc"
7706	void writeClause(OMPClause *C);
7707	void VisitOMPClauseWithPreInit(OMPClauseWithPreInit *C);
7708	void VisitOMPClauseWithPostUpdate(OMPClauseWithPostUpdate *C);
7709	};
7710
7711	}
7712
7713	void ASTRecordWriter::writeOMPClause(OMPClause *C) {
7714	OMPClauseWriter(*this).writeClause(C);
7715	}
7716
7717	void OMPClauseWriter::writeClause(OMPClause *C) {
7718	Record.push_back(N: unsigned(C->getClauseKind()));
7719	Visit(C);
7720	Record.AddSourceLocation(Loc: C->getBeginLoc());
7721	Record.AddSourceLocation(Loc: C->getEndLoc());
7722	}
7723
7724	void OMPClauseWriter::VisitOMPClauseWithPreInit(OMPClauseWithPreInit *C) {
7725	Record.push_back(N: uint64_t(C->getCaptureRegion()));
7726	Record.AddStmt(S: C->getPreInitStmt());
7727	}
7728
7729	void OMPClauseWriter::VisitOMPClauseWithPostUpdate(OMPClauseWithPostUpdate *C) {
7730	VisitOMPClauseWithPreInit(C);
7731	Record.AddStmt(C->getPostUpdateExpr());
7732	}
7733
7734	void OMPClauseWriter::VisitOMPIfClause(OMPIfClause *C) {
7735	VisitOMPClauseWithPreInit(C);
7736	Record.push_back(N: uint64_t(C->getNameModifier()));
7737	Record.AddSourceLocation(Loc: C->getNameModifierLoc());
7738	Record.AddSourceLocation(Loc: C->getColonLoc());
7739	Record.AddStmt(C->getCondition());
7740	Record.AddSourceLocation(Loc: C->getLParenLoc());
7741	}
7742
7743	void OMPClauseWriter::VisitOMPFinalClause(OMPFinalClause *C) {
7744	VisitOMPClauseWithPreInit(C);
7745	Record.AddStmt(C->getCondition());
7746	Record.AddSourceLocation(Loc: C->getLParenLoc());
7747	}
7748
7749	void OMPClauseWriter::VisitOMPNumThreadsClause(OMPNumThreadsClause *C) {
7750	VisitOMPClauseWithPreInit(C);
7751	Record.AddStmt(C->getNumThreads());
7752	Record.AddSourceLocation(Loc: C->getLParenLoc());
7753	}
7754
7755	void OMPClauseWriter::VisitOMPSafelenClause(OMPSafelenClause *C) {
7756	Record.AddStmt(C->getSafelen());
7757	Record.AddSourceLocation(Loc: C->getLParenLoc());
7758	}
7759
7760	void OMPClauseWriter::VisitOMPSimdlenClause(OMPSimdlenClause *C) {
7761	Record.AddStmt(C->getSimdlen());
7762	Record.AddSourceLocation(Loc: C->getLParenLoc());
7763	}
7764
7765	void OMPClauseWriter::VisitOMPSizesClause(OMPSizesClause *C) {
7766	Record.push_back(N: C->getNumSizes());
7767	for (Expr *Size : C->getSizesRefs())
7768	Record.AddStmt(Size);
7769	Record.AddSourceLocation(Loc: C->getLParenLoc());
7770	}
7771
7772	void OMPClauseWriter::VisitOMPPermutationClause(OMPPermutationClause *C) {
7773	Record.push_back(N: C->getNumLoops());
7774	for (Expr *Size : C->getArgsRefs())
7775	Record.AddStmt(Size);
7776	Record.AddSourceLocation(Loc: C->getLParenLoc());
7777	}
7778
7779	void OMPClauseWriter::VisitOMPFullClause(OMPFullClause *C) {}
7780
7781	void OMPClauseWriter::VisitOMPPartialClause(OMPPartialClause *C) {
7782	Record.AddStmt(C->getFactor());
7783	Record.AddSourceLocation(Loc: C->getLParenLoc());
7784	}
7785
7786	void OMPClauseWriter::VisitOMPAllocatorClause(OMPAllocatorClause *C) {
7787	Record.AddStmt(C->getAllocator());
7788	Record.AddSourceLocation(Loc: C->getLParenLoc());
7789	}
7790
7791	void OMPClauseWriter::VisitOMPCollapseClause(OMPCollapseClause *C) {
7792	Record.AddStmt(C->getNumForLoops());
7793	Record.AddSourceLocation(Loc: C->getLParenLoc());
7794	}
7795
7796	void OMPClauseWriter::VisitOMPDetachClause(OMPDetachClause *C) {
7797	Record.AddStmt(C->getEventHandler());
7798	Record.AddSourceLocation(Loc: C->getLParenLoc());
7799	}
7800
7801	void OMPClauseWriter::VisitOMPDefaultClause(OMPDefaultClause *C) {
7802	Record.push_back(N: unsigned(C->getDefaultKind()));
7803	Record.AddSourceLocation(Loc: C->getLParenLoc());
7804	Record.AddSourceLocation(Loc: C->getDefaultKindKwLoc());
7805	}
7806
7807	void OMPClauseWriter::VisitOMPProcBindClause(OMPProcBindClause *C) {
7808	Record.push_back(N: unsigned(C->getProcBindKind()));
7809	Record.AddSourceLocation(Loc: C->getLParenLoc());
7810	Record.AddSourceLocation(Loc: C->getProcBindKindKwLoc());
7811	}
7812
7813	void OMPClauseWriter::VisitOMPScheduleClause(OMPScheduleClause *C) {
7814	VisitOMPClauseWithPreInit(C);
7815	Record.push_back(N: C->getScheduleKind());
7816	Record.push_back(N: C->getFirstScheduleModifier());
7817	Record.push_back(N: C->getSecondScheduleModifier());
7818	Record.AddStmt(C->getChunkSize());
7819	Record.AddSourceLocation(Loc: C->getLParenLoc());
7820	Record.AddSourceLocation(Loc: C->getFirstScheduleModifierLoc());
7821	Record.AddSourceLocation(Loc: C->getSecondScheduleModifierLoc());
7822	Record.AddSourceLocation(Loc: C->getScheduleKindLoc());
7823	Record.AddSourceLocation(Loc: C->getCommaLoc());
7824	}
7825
7826	void OMPClauseWriter::VisitOMPOrderedClause(OMPOrderedClause *C) {
7827	Record.push_back(N: C->getLoopNumIterations().size());
7828	Record.AddStmt(C->getNumForLoops());
7829	for (Expr *NumIter : C->getLoopNumIterations())
7830	Record.AddStmt(NumIter);
7831	for (unsigned I = 0, E = C->getLoopNumIterations().size(); I <E; ++I)
7832	Record.AddStmt(C->getLoopCounter(NumLoop: I));
7833	Record.AddSourceLocation(Loc: C->getLParenLoc());
7834	}
7835
7836	void OMPClauseWriter::VisitOMPNowaitClause(OMPNowaitClause *) {}
7837
7838	void OMPClauseWriter::VisitOMPUntiedClause(OMPUntiedClause *) {}
7839
7840	void OMPClauseWriter::VisitOMPMergeableClause(OMPMergeableClause *) {}
7841
7842	void OMPClauseWriter::VisitOMPReadClause(OMPReadClause *) {}
7843
7844	void OMPClauseWriter::VisitOMPWriteClause(OMPWriteClause *) {}
7845
7846	void OMPClauseWriter::VisitOMPUpdateClause(OMPUpdateClause *C) {
7847	Record.push_back(N: C->isExtended() ? 1 : 0);
7848	if (C->isExtended()) {
7849	Record.AddSourceLocation(Loc: C->getLParenLoc());
7850	Record.AddSourceLocation(Loc: C->getArgumentLoc());
7851	Record.writeEnum(C->getDependencyKind());
7852	}
7853	}
7854
7855	void OMPClauseWriter::VisitOMPCaptureClause(OMPCaptureClause *) {}
7856
7857	void OMPClauseWriter::VisitOMPCompareClause(OMPCompareClause *) {}
7858
7859	// Save the parameter of fail clause.
7860	void OMPClauseWriter::VisitOMPFailClause(OMPFailClause *C) {
7861	Record.AddSourceLocation(Loc: C->getLParenLoc());
7862	Record.AddSourceLocation(Loc: C->getFailParameterLoc());
7863	Record.writeEnum(C->getFailParameter());
7864	}
7865
7866	void OMPClauseWriter::VisitOMPSeqCstClause(OMPSeqCstClause *) {}
7867
7868	void OMPClauseWriter::VisitOMPAcqRelClause(OMPAcqRelClause *) {}
7869
7870	void OMPClauseWriter::VisitOMPAbsentClause(OMPAbsentClause *C) {
7871	Record.push_back(N: static_cast<uint64_t>(C->getDirectiveKinds().size()));
7872	Record.AddSourceLocation(Loc: C->getLParenLoc());
7873	for (auto K : C->getDirectiveKinds()) {
7874	Record.writeEnum(K);
7875	}
7876	}
7877
7878	void OMPClauseWriter::VisitOMPHoldsClause(OMPHoldsClause *C) {
7879	Record.AddStmt(C->getExpr());
7880	Record.AddSourceLocation(Loc: C->getLParenLoc());
7881	}
7882
7883	void OMPClauseWriter::VisitOMPContainsClause(OMPContainsClause *C) {
7884	Record.push_back(N: static_cast<uint64_t>(C->getDirectiveKinds().size()));
7885	Record.AddSourceLocation(Loc: C->getLParenLoc());
7886	for (auto K : C->getDirectiveKinds()) {
7887	Record.writeEnum(K);
7888	}
7889	}
7890
7891	void OMPClauseWriter::VisitOMPNoOpenMPClause(OMPNoOpenMPClause *) {}
7892
7893	void OMPClauseWriter::VisitOMPNoOpenMPRoutinesClause(
7894	OMPNoOpenMPRoutinesClause *) {}
7895
7896	void OMPClauseWriter::VisitOMPNoOpenMPConstructsClause(
7897	OMPNoOpenMPConstructsClause *) {}
7898
7899	void OMPClauseWriter::VisitOMPNoParallelismClause(OMPNoParallelismClause *) {}
7900
7901	void OMPClauseWriter::VisitOMPAcquireClause(OMPAcquireClause *) {}
7902
7903	void OMPClauseWriter::VisitOMPReleaseClause(OMPReleaseClause *) {}
7904
7905	void OMPClauseWriter::VisitOMPRelaxedClause(OMPRelaxedClause *) {}
7906
7907	void OMPClauseWriter::VisitOMPWeakClause(OMPWeakClause *) {}
7908
7909	void OMPClauseWriter::VisitOMPThreadsClause(OMPThreadsClause *) {}
7910
7911	void OMPClauseWriter::VisitOMPSIMDClause(OMPSIMDClause *) {}
7912
7913	void OMPClauseWriter::VisitOMPNogroupClause(OMPNogroupClause *) {}
7914
7915	void OMPClauseWriter::VisitOMPInitClause(OMPInitClause *C) {
7916	Record.push_back(N: C->varlist_size());
7917	for (Expr *VE : C->varlist())
7918	Record.AddStmt(VE);
7919	Record.writeBool(Value: C->getIsTarget());
7920	Record.writeBool(Value: C->getIsTargetSync());
7921	Record.AddSourceLocation(Loc: C->getLParenLoc());
7922	Record.AddSourceLocation(Loc: C->getVarLoc());
7923	}
7924
7925	void OMPClauseWriter::VisitOMPUseClause(OMPUseClause *C) {
7926	Record.AddStmt(C->getInteropVar());
7927	Record.AddSourceLocation(Loc: C->getLParenLoc());
7928	Record.AddSourceLocation(Loc: C->getVarLoc());
7929	}
7930
7931	void OMPClauseWriter::VisitOMPDestroyClause(OMPDestroyClause *C) {
7932	Record.AddStmt(C->getInteropVar());
7933	Record.AddSourceLocation(Loc: C->getLParenLoc());
7934	Record.AddSourceLocation(Loc: C->getVarLoc());
7935	}
7936
7937	void OMPClauseWriter::VisitOMPNovariantsClause(OMPNovariantsClause *C) {
7938	VisitOMPClauseWithPreInit(C);
7939	Record.AddStmt(C->getCondition());
7940	Record.AddSourceLocation(Loc: C->getLParenLoc());
7941	}
7942
7943	void OMPClauseWriter::VisitOMPNocontextClause(OMPNocontextClause *C) {
7944	VisitOMPClauseWithPreInit(C);
7945	Record.AddStmt(C->getCondition());
7946	Record.AddSourceLocation(Loc: C->getLParenLoc());
7947	}
7948
7949	void OMPClauseWriter::VisitOMPFilterClause(OMPFilterClause *C) {
7950	VisitOMPClauseWithPreInit(C);
7951	Record.AddStmt(C->getThreadID());
7952	Record.AddSourceLocation(Loc: C->getLParenLoc());
7953	}
7954
7955	void OMPClauseWriter::VisitOMPAlignClause(OMPAlignClause *C) {
7956	Record.AddStmt(C->getAlignment());
7957	Record.AddSourceLocation(Loc: C->getLParenLoc());
7958	}
7959
7960	void OMPClauseWriter::VisitOMPPrivateClause(OMPPrivateClause *C) {
7961	Record.push_back(N: C->varlist_size());
7962	Record.AddSourceLocation(Loc: C->getLParenLoc());
7963	for (auto *VE : C->varlist()) {
7964	Record.AddStmt(VE);
7965	}
7966	for (auto *VE : C->private_copies()) {
7967	Record.AddStmt(VE);
7968	}
7969	}
7970
7971	void OMPClauseWriter::VisitOMPFirstprivateClause(OMPFirstprivateClause *C) {
7972	Record.push_back(N: C->varlist_size());
7973	VisitOMPClauseWithPreInit(C);
7974	Record.AddSourceLocation(Loc: C->getLParenLoc());
7975	for (auto *VE : C->varlist()) {
7976	Record.AddStmt(VE);
7977	}
7978	for (auto *VE : C->private_copies()) {
7979	Record.AddStmt(VE);
7980	}
7981	for (auto *VE : C->inits()) {
7982	Record.AddStmt(VE);
7983	}
7984	}
7985
7986	void OMPClauseWriter::VisitOMPLastprivateClause(OMPLastprivateClause *C) {
7987	Record.push_back(N: C->varlist_size());
7988	VisitOMPClauseWithPostUpdate(C);
7989	Record.AddSourceLocation(Loc: C->getLParenLoc());
7990	Record.writeEnum(C->getKind());
7991	Record.AddSourceLocation(Loc: C->getKindLoc());
7992	Record.AddSourceLocation(Loc: C->getColonLoc());
7993	for (auto *VE : C->varlist())
7994	Record.AddStmt(VE);
7995	for (auto *E : C->private_copies())
7996	Record.AddStmt(E);
7997	for (auto *E : C->source_exprs())
7998	Record.AddStmt(E);
7999	for (auto *E : C->destination_exprs())
8000	Record.AddStmt(E);
8001	for (auto *E : C->assignment_ops())
8002	Record.AddStmt(E);
8003	}
8004
8005	void OMPClauseWriter::VisitOMPSharedClause(OMPSharedClause *C) {
8006	Record.push_back(N: C->varlist_size());
8007	Record.AddSourceLocation(Loc: C->getLParenLoc());
8008	for (auto *VE : C->varlist())
8009	Record.AddStmt(VE);
8010	}
8011
8012	void OMPClauseWriter::VisitOMPReductionClause(OMPReductionClause *C) {
8013	Record.push_back(N: C->varlist_size());
8014	Record.writeEnum(C->getModifier());
8015	VisitOMPClauseWithPostUpdate(C);
8016	Record.AddSourceLocation(Loc: C->getLParenLoc());
8017	Record.AddSourceLocation(Loc: C->getModifierLoc());
8018	Record.AddSourceLocation(Loc: C->getColonLoc());
8019	Record.AddNestedNameSpecifierLoc(NNS: C->getQualifierLoc());
8020	Record.AddDeclarationNameInfo(NameInfo: C->getNameInfo());
8021	for (auto *VE : C->varlist())
8022	Record.AddStmt(VE);
8023	for (auto *VE : C->privates())
8024	Record.AddStmt(VE);
8025	for (auto *E : C->lhs_exprs())
8026	Record.AddStmt(E);
8027	for (auto *E : C->rhs_exprs())
8028	Record.AddStmt(E);
8029	for (auto *E : C->reduction_ops())
8030	Record.AddStmt(E);
8031	if (C->getModifier() == clang::OMPC_REDUCTION_inscan) {
8032	for (auto *E : C->copy_ops())
8033	Record.AddStmt(E);
8034	for (auto *E : C->copy_array_temps())
8035	Record.AddStmt(E);
8036	for (auto *E : C->copy_array_elems())
8037	Record.AddStmt(E);
8038	}
8039	auto PrivateFlags = C->private_var_reduction_flags();
8040	Record.push_back(N: std::distance(first: PrivateFlags.begin(), last: PrivateFlags.end()));
8041	for (bool Flag : PrivateFlags)
8042	Record.push_back(N: Flag);
8043	}
8044
8045	void OMPClauseWriter::VisitOMPTaskReductionClause(OMPTaskReductionClause *C) {
8046	Record.push_back(N: C->varlist_size());
8047	VisitOMPClauseWithPostUpdate(C);
8048	Record.AddSourceLocation(Loc: C->getLParenLoc());
8049	Record.AddSourceLocation(Loc: C->getColonLoc());
8050	Record.AddNestedNameSpecifierLoc(NNS: C->getQualifierLoc());
8051	Record.AddDeclarationNameInfo(NameInfo: C->getNameInfo());
8052	for (auto *VE : C->varlist())
8053	Record.AddStmt(VE);
8054	for (auto *VE : C->privates())
8055	Record.AddStmt(VE);
8056	for (auto *E : C->lhs_exprs())
8057	Record.AddStmt(E);
8058	for (auto *E : C->rhs_exprs())
8059	Record.AddStmt(E);
8060	for (auto *E : C->reduction_ops())
8061	Record.AddStmt(E);
8062	}
8063
8064	void OMPClauseWriter::VisitOMPInReductionClause(OMPInReductionClause *C) {
8065	Record.push_back(N: C->varlist_size());
8066	VisitOMPClauseWithPostUpdate(C);
8067	Record.AddSourceLocation(Loc: C->getLParenLoc());
8068	Record.AddSourceLocation(Loc: C->getColonLoc());
8069	Record.AddNestedNameSpecifierLoc(NNS: C->getQualifierLoc());
8070	Record.AddDeclarationNameInfo(NameInfo: C->getNameInfo());
8071	for (auto *VE : C->varlist())
8072	Record.AddStmt(VE);
8073	for (auto *VE : C->privates())
8074	Record.AddStmt(VE);
8075	for (auto *E : C->lhs_exprs())
8076	Record.AddStmt(E);
8077	for (auto *E : C->rhs_exprs())
8078	Record.AddStmt(E);
8079	for (auto *E : C->reduction_ops())
8080	Record.AddStmt(E);
8081	for (auto *E : C->taskgroup_descriptors())
8082	Record.AddStmt(E);
8083	}
8084
8085	void OMPClauseWriter::VisitOMPLinearClause(OMPLinearClause *C) {
8086	Record.push_back(N: C->varlist_size());
8087	VisitOMPClauseWithPostUpdate(C);
8088	Record.AddSourceLocation(Loc: C->getLParenLoc());
8089	Record.AddSourceLocation(Loc: C->getColonLoc());
8090	Record.push_back(N: C->getModifier());
8091	Record.AddSourceLocation(Loc: C->getModifierLoc());
8092	for (auto *VE : C->varlist()) {
8093	Record.AddStmt(VE);
8094	}
8095	for (auto *VE : C->privates()) {
8096	Record.AddStmt(VE);
8097	}
8098	for (auto *VE : C->inits()) {
8099	Record.AddStmt(VE);
8100	}
8101	for (auto *VE : C->updates()) {
8102	Record.AddStmt(VE);
8103	}
8104	for (auto *VE : C->finals()) {
8105	Record.AddStmt(VE);
8106	}
8107	Record.AddStmt(C->getStep());
8108	Record.AddStmt(C->getCalcStep());
8109	for (auto *VE : C->used_expressions())
8110	Record.AddStmt(VE);
8111	}
8112
8113	void OMPClauseWriter::VisitOMPAlignedClause(OMPAlignedClause *C) {
8114	Record.push_back(N: C->varlist_size());
8115	Record.AddSourceLocation(Loc: C->getLParenLoc());
8116	Record.AddSourceLocation(Loc: C->getColonLoc());
8117	for (auto *VE : C->varlist())
8118	Record.AddStmt(VE);
8119	Record.AddStmt(C->getAlignment());
8120	}
8121
8122	void OMPClauseWriter::VisitOMPCopyinClause(OMPCopyinClause *C) {
8123	Record.push_back(N: C->varlist_size());
8124	Record.AddSourceLocation(Loc: C->getLParenLoc());
8125	for (auto *VE : C->varlist())
8126	Record.AddStmt(VE);
8127	for (auto *E : C->source_exprs())
8128	Record.AddStmt(E);
8129	for (auto *E : C->destination_exprs())
8130	Record.AddStmt(E);
8131	for (auto *E : C->assignment_ops())
8132	Record.AddStmt(E);
8133	}
8134
8135	void OMPClauseWriter::VisitOMPCopyprivateClause(OMPCopyprivateClause *C) {
8136	Record.push_back(N: C->varlist_size());
8137	Record.AddSourceLocation(Loc: C->getLParenLoc());
8138	for (auto *VE : C->varlist())
8139	Record.AddStmt(VE);
8140	for (auto *E : C->source_exprs())
8141	Record.AddStmt(E);
8142	for (auto *E : C->destination_exprs())
8143	Record.AddStmt(E);
8144	for (auto *E : C->assignment_ops())
8145	Record.AddStmt(E);
8146	}
8147
8148	void OMPClauseWriter::VisitOMPFlushClause(OMPFlushClause *C) {
8149	Record.push_back(N: C->varlist_size());
8150	Record.AddSourceLocation(Loc: C->getLParenLoc());
8151	for (auto *VE : C->varlist())
8152	Record.AddStmt(VE);
8153	}
8154
8155	void OMPClauseWriter::VisitOMPDepobjClause(OMPDepobjClause *C) {
8156	Record.AddStmt(C->getDepobj());
8157	Record.AddSourceLocation(Loc: C->getLParenLoc());
8158	}
8159
8160	void OMPClauseWriter::VisitOMPDependClause(OMPDependClause *C) {
8161	Record.push_back(N: C->varlist_size());
8162	Record.push_back(N: C->getNumLoops());
8163	Record.AddSourceLocation(Loc: C->getLParenLoc());
8164	Record.AddStmt(C->getModifier());
8165	Record.push_back(N: C->getDependencyKind());
8166	Record.AddSourceLocation(Loc: C->getDependencyLoc());
8167	Record.AddSourceLocation(Loc: C->getColonLoc());
8168	Record.AddSourceLocation(Loc: C->getOmpAllMemoryLoc());
8169	for (auto *VE : C->varlist())
8170	Record.AddStmt(VE);
8171	for (unsigned I = 0, E = C->getNumLoops(); I < E; ++I)
8172	Record.AddStmt(C->getLoopData(NumLoop: I));
8173	}
8174
8175	void OMPClauseWriter::VisitOMPDeviceClause(OMPDeviceClause *C) {
8176	VisitOMPClauseWithPreInit(C);
8177	Record.writeEnum(C->getModifier());
8178	Record.AddStmt(C->getDevice());
8179	Record.AddSourceLocation(Loc: C->getModifierLoc());
8180	Record.AddSourceLocation(Loc: C->getLParenLoc());
8181	}
8182
8183	void OMPClauseWriter::VisitOMPMapClause(OMPMapClause *C) {
8184	Record.push_back(N: C->varlist_size());
8185	Record.push_back(N: C->getUniqueDeclarationsNum());
8186	Record.push_back(N: C->getTotalComponentListNum());
8187	Record.push_back(N: C->getTotalComponentsNum());
8188	Record.AddSourceLocation(Loc: C->getLParenLoc());
8189	bool HasIteratorModifier = false;
8190	for (unsigned I = 0; I < NumberOfOMPMapClauseModifiers; ++I) {
8191	Record.push_back(N: C->getMapTypeModifier(Cnt: I));
8192	Record.AddSourceLocation(Loc: C->getMapTypeModifierLoc(Cnt: I));
8193	if (C->getMapTypeModifier(Cnt: I) == OMPC_MAP_MODIFIER_iterator)
8194	HasIteratorModifier = true;
8195	}
8196	Record.AddNestedNameSpecifierLoc(NNS: C->getMapperQualifierLoc());
8197	Record.AddDeclarationNameInfo(NameInfo: C->getMapperIdInfo());
8198	Record.push_back(N: C->getMapType());
8199	Record.AddSourceLocation(Loc: C->getMapLoc());
8200	Record.AddSourceLocation(Loc: C->getColonLoc());
8201	for (auto *E : C->varlist())
8202	Record.AddStmt(E);
8203	for (auto *E : C->mapperlists())
8204	Record.AddStmt(E);
8205	if (HasIteratorModifier)
8206	Record.AddStmt(C->getIteratorModifier());
8207	for (auto *D : C->all_decls())
8208	Record.AddDeclRef(D);
8209	for (auto N : C->all_num_lists())
8210	Record.push_back(N);
8211	for (auto N : C->all_lists_sizes())
8212	Record.push_back(N);
8213	for (auto &M : C->all_components()) {
8214	Record.AddStmt(M.getAssociatedExpression());
8215	Record.AddDeclRef(M.getAssociatedDeclaration());
8216	}
8217	}
8218
8219	void OMPClauseWriter::VisitOMPAllocateClause(OMPAllocateClause *C) {
8220	Record.push_back(N: C->varlist_size());
8221	Record.writeEnum(C->getFirstAllocateModifier());
8222	Record.writeEnum(C->getSecondAllocateModifier());
8223	Record.AddSourceLocation(Loc: C->getLParenLoc());
8224	Record.AddSourceLocation(Loc: C->getColonLoc());
8225	Record.AddStmt(C->getAllocator());
8226	Record.AddStmt(C->getAlignment());
8227	for (auto *VE : C->varlist())
8228	Record.AddStmt(VE);
8229	}
8230
8231	void OMPClauseWriter::VisitOMPNumTeamsClause(OMPNumTeamsClause *C) {
8232	Record.push_back(N: C->varlist_size());
8233	VisitOMPClauseWithPreInit(C);
8234	Record.AddSourceLocation(Loc: C->getLParenLoc());
8235	for (auto *VE : C->varlist())
8236	Record.AddStmt(VE);
8237	}
8238
8239	void OMPClauseWriter::VisitOMPThreadLimitClause(OMPThreadLimitClause *C) {
8240	Record.push_back(N: C->varlist_size());
8241	VisitOMPClauseWithPreInit(C);
8242	Record.AddSourceLocation(Loc: C->getLParenLoc());
8243	for (auto *VE : C->varlist())
8244	Record.AddStmt(VE);
8245	}
8246
8247	void OMPClauseWriter::VisitOMPPriorityClause(OMPPriorityClause *C) {
8248	VisitOMPClauseWithPreInit(C);
8249	Record.AddStmt(C->getPriority());
8250	Record.AddSourceLocation(Loc: C->getLParenLoc());
8251	}
8252
8253	void OMPClauseWriter::VisitOMPGrainsizeClause(OMPGrainsizeClause *C) {
8254	VisitOMPClauseWithPreInit(C);
8255	Record.writeEnum(C->getModifier());
8256	Record.AddStmt(C->getGrainsize());
8257	Record.AddSourceLocation(Loc: C->getModifierLoc());
8258	Record.AddSourceLocation(Loc: C->getLParenLoc());
8259	}
8260
8261	void OMPClauseWriter::VisitOMPNumTasksClause(OMPNumTasksClause *C) {
8262	VisitOMPClauseWithPreInit(C);
8263	Record.writeEnum(C->getModifier());
8264	Record.AddStmt(C->getNumTasks());
8265	Record.AddSourceLocation(Loc: C->getModifierLoc());
8266	Record.AddSourceLocation(Loc: C->getLParenLoc());
8267	}
8268
8269	void OMPClauseWriter::VisitOMPHintClause(OMPHintClause *C) {
8270	Record.AddStmt(C->getHint());
8271	Record.AddSourceLocation(Loc: C->getLParenLoc());
8272	}
8273
8274	void OMPClauseWriter::VisitOMPDistScheduleClause(OMPDistScheduleClause *C) {
8275	VisitOMPClauseWithPreInit(C);
8276	Record.push_back(N: C->getDistScheduleKind());
8277	Record.AddStmt(C->getChunkSize());
8278	Record.AddSourceLocation(Loc: C->getLParenLoc());
8279	Record.AddSourceLocation(Loc: C->getDistScheduleKindLoc());
8280	Record.AddSourceLocation(Loc: C->getCommaLoc());
8281	}
8282
8283	void OMPClauseWriter::VisitOMPDefaultmapClause(OMPDefaultmapClause *C) {
8284	Record.push_back(N: C->getDefaultmapKind());
8285	Record.push_back(N: C->getDefaultmapModifier());
8286	Record.AddSourceLocation(Loc: C->getLParenLoc());
8287	Record.AddSourceLocation(Loc: C->getDefaultmapModifierLoc());
8288	Record.AddSourceLocation(Loc: C->getDefaultmapKindLoc());
8289	}
8290
8291	void OMPClauseWriter::VisitOMPToClause(OMPToClause *C) {
8292	Record.push_back(N: C->varlist_size());
8293	Record.push_back(N: C->getUniqueDeclarationsNum());
8294	Record.push_back(N: C->getTotalComponentListNum());
8295	Record.push_back(N: C->getTotalComponentsNum());
8296	Record.AddSourceLocation(Loc: C->getLParenLoc());
8297	for (unsigned I = 0; I < NumberOfOMPMotionModifiers; ++I) {
8298	Record.push_back(N: C->getMotionModifier(Cnt: I));
8299	Record.AddSourceLocation(Loc: C->getMotionModifierLoc(Cnt: I));
8300	}
8301	Record.AddNestedNameSpecifierLoc(NNS: C->getMapperQualifierLoc());
8302	Record.AddDeclarationNameInfo(NameInfo: C->getMapperIdInfo());
8303	Record.AddSourceLocation(Loc: C->getColonLoc());
8304	for (auto *E : C->varlist())
8305	Record.AddStmt(E);
8306	for (auto *E : C->mapperlists())
8307	Record.AddStmt(E);
8308	for (auto *D : C->all_decls())
8309	Record.AddDeclRef(D);
8310	for (auto N : C->all_num_lists())
8311	Record.push_back(N);
8312	for (auto N : C->all_lists_sizes())
8313	Record.push_back(N);
8314	for (auto &M : C->all_components()) {
8315	Record.AddStmt(M.getAssociatedExpression());
8316	Record.writeBool(M.isNonContiguous());
8317	Record.AddDeclRef(M.getAssociatedDeclaration());
8318	}
8319	}
8320
8321	void OMPClauseWriter::VisitOMPFromClause(OMPFromClause *C) {
8322	Record.push_back(N: C->varlist_size());
8323	Record.push_back(N: C->getUniqueDeclarationsNum());
8324	Record.push_back(N: C->getTotalComponentListNum());
8325	Record.push_back(N: C->getTotalComponentsNum());
8326	Record.AddSourceLocation(Loc: C->getLParenLoc());
8327	for (unsigned I = 0; I < NumberOfOMPMotionModifiers; ++I) {
8328	Record.push_back(N: C->getMotionModifier(Cnt: I));
8329	Record.AddSourceLocation(Loc: C->getMotionModifierLoc(Cnt: I));
8330	}
8331	Record.AddNestedNameSpecifierLoc(NNS: C->getMapperQualifierLoc());
8332	Record.AddDeclarationNameInfo(NameInfo: C->getMapperIdInfo());
8333	Record.AddSourceLocation(Loc: C->getColonLoc());
8334	for (auto *E : C->varlist())
8335	Record.AddStmt(E);
8336	for (auto *E : C->mapperlists())
8337	Record.AddStmt(E);
8338	for (auto *D : C->all_decls())
8339	Record.AddDeclRef(D);
8340	for (auto N : C->all_num_lists())
8341	Record.push_back(N);
8342	for (auto N : C->all_lists_sizes())
8343	Record.push_back(N);
8344	for (auto &M : C->all_components()) {
8345	Record.AddStmt(M.getAssociatedExpression());
8346	Record.writeBool(M.isNonContiguous());
8347	Record.AddDeclRef(M.getAssociatedDeclaration());
8348	}
8349	}
8350
8351	void OMPClauseWriter::VisitOMPUseDevicePtrClause(OMPUseDevicePtrClause *C) {
8352	Record.push_back(N: C->varlist_size());
8353	Record.push_back(N: C->getUniqueDeclarationsNum());
8354	Record.push_back(N: C->getTotalComponentListNum());
8355	Record.push_back(N: C->getTotalComponentsNum());
8356	Record.AddSourceLocation(Loc: C->getLParenLoc());
8357	for (auto *E : C->varlist())
8358	Record.AddStmt(E);
8359	for (auto *VE : C->private_copies())
8360	Record.AddStmt(VE);
8361	for (auto *VE : C->inits())
8362	Record.AddStmt(VE);
8363	for (auto *D : C->all_decls())
8364	Record.AddDeclRef(D);
8365	for (auto N : C->all_num_lists())
8366	Record.push_back(N);
8367	for (auto N : C->all_lists_sizes())
8368	Record.push_back(N);
8369	for (auto &M : C->all_components()) {
8370	Record.AddStmt(M.getAssociatedExpression());
8371	Record.AddDeclRef(M.getAssociatedDeclaration());
8372	}
8373	}
8374
8375	void OMPClauseWriter::VisitOMPUseDeviceAddrClause(OMPUseDeviceAddrClause *C) {
8376	Record.push_back(N: C->varlist_size());
8377	Record.push_back(N: C->getUniqueDeclarationsNum());
8378	Record.push_back(N: C->getTotalComponentListNum());
8379	Record.push_back(N: C->getTotalComponentsNum());
8380	Record.AddSourceLocation(Loc: C->getLParenLoc());
8381	for (auto *E : C->varlist())
8382	Record.AddStmt(E);
8383	for (auto *D : C->all_decls())
8384	Record.AddDeclRef(D);
8385	for (auto N : C->all_num_lists())
8386	Record.push_back(N);
8387	for (auto N : C->all_lists_sizes())
8388	Record.push_back(N);
8389	for (auto &M : C->all_components()) {
8390	Record.AddStmt(M.getAssociatedExpression());
8391	Record.AddDeclRef(M.getAssociatedDeclaration());
8392	}
8393	}
8394
8395	void OMPClauseWriter::VisitOMPIsDevicePtrClause(OMPIsDevicePtrClause *C) {
8396	Record.push_back(N: C->varlist_size());
8397	Record.push_back(N: C->getUniqueDeclarationsNum());
8398	Record.push_back(N: C->getTotalComponentListNum());
8399	Record.push_back(N: C->getTotalComponentsNum());
8400	Record.AddSourceLocation(Loc: C->getLParenLoc());
8401	for (auto *E : C->varlist())
8402	Record.AddStmt(E);
8403	for (auto *D : C->all_decls())
8404	Record.AddDeclRef(D);
8405	for (auto N : C->all_num_lists())
8406	Record.push_back(N);
8407	for (auto N : C->all_lists_sizes())
8408	Record.push_back(N);
8409	for (auto &M : C->all_components()) {
8410	Record.AddStmt(M.getAssociatedExpression());
8411	Record.AddDeclRef(M.getAssociatedDeclaration());
8412	}
8413	}
8414
8415	void OMPClauseWriter::VisitOMPHasDeviceAddrClause(OMPHasDeviceAddrClause *C) {
8416	Record.push_back(N: C->varlist_size());
8417	Record.push_back(N: C->getUniqueDeclarationsNum());
8418	Record.push_back(N: C->getTotalComponentListNum());
8419	Record.push_back(N: C->getTotalComponentsNum());
8420	Record.AddSourceLocation(Loc: C->getLParenLoc());
8421	for (auto *E : C->varlist())
8422	Record.AddStmt(E);
8423	for (auto *D : C->all_decls())
8424	Record.AddDeclRef(D);
8425	for (auto N : C->all_num_lists())
8426	Record.push_back(N);
8427	for (auto N : C->all_lists_sizes())
8428	Record.push_back(N);
8429	for (auto &M : C->all_components()) {
8430	Record.AddStmt(M.getAssociatedExpression());
8431	Record.AddDeclRef(M.getAssociatedDeclaration());
8432	}
8433	}
8434
8435	void OMPClauseWriter::VisitOMPUnifiedAddressClause(OMPUnifiedAddressClause *) {}
8436
8437	void OMPClauseWriter::VisitOMPUnifiedSharedMemoryClause(
8438	OMPUnifiedSharedMemoryClause *) {}
8439
8440	void OMPClauseWriter::VisitOMPReverseOffloadClause(OMPReverseOffloadClause *) {}
8441
8442	void
8443	OMPClauseWriter::VisitOMPDynamicAllocatorsClause(OMPDynamicAllocatorsClause *) {
8444	}
8445
8446	void OMPClauseWriter::VisitOMPAtomicDefaultMemOrderClause(
8447	OMPAtomicDefaultMemOrderClause *C) {
8448	Record.push_back(N: C->getAtomicDefaultMemOrderKind());
8449	Record.AddSourceLocation(Loc: C->getLParenLoc());
8450	Record.AddSourceLocation(Loc: C->getAtomicDefaultMemOrderKindKwLoc());
8451	}
8452
8453	void OMPClauseWriter::VisitOMPSelfMapsClause(OMPSelfMapsClause *) {}
8454
8455	void OMPClauseWriter::VisitOMPAtClause(OMPAtClause *C) {
8456	Record.push_back(N: C->getAtKind());
8457	Record.AddSourceLocation(Loc: C->getLParenLoc());
8458	Record.AddSourceLocation(Loc: C->getAtKindKwLoc());
8459	}
8460
8461	void OMPClauseWriter::VisitOMPSeverityClause(OMPSeverityClause *C) {
8462	Record.push_back(N: C->getSeverityKind());
8463	Record.AddSourceLocation(Loc: C->getLParenLoc());
8464	Record.AddSourceLocation(Loc: C->getSeverityKindKwLoc());
8465	}
8466
8467	void OMPClauseWriter::VisitOMPMessageClause(OMPMessageClause *C) {
8468	Record.AddStmt(C->getMessageString());
8469	Record.AddSourceLocation(Loc: C->getLParenLoc());
8470	}
8471
8472	void OMPClauseWriter::VisitOMPNontemporalClause(OMPNontemporalClause *C) {
8473	Record.push_back(N: C->varlist_size());
8474	Record.AddSourceLocation(Loc: C->getLParenLoc());
8475	for (auto *VE : C->varlist())
8476	Record.AddStmt(VE);
8477	for (auto *E : C->private_refs())
8478	Record.AddStmt(E);
8479	}
8480
8481	void OMPClauseWriter::VisitOMPInclusiveClause(OMPInclusiveClause *C) {
8482	Record.push_back(N: C->varlist_size());
8483	Record.AddSourceLocation(Loc: C->getLParenLoc());
8484	for (auto *VE : C->varlist())
8485	Record.AddStmt(VE);
8486	}
8487
8488	void OMPClauseWriter::VisitOMPExclusiveClause(OMPExclusiveClause *C) {
8489	Record.push_back(N: C->varlist_size());
8490	Record.AddSourceLocation(Loc: C->getLParenLoc());
8491	for (auto *VE : C->varlist())
8492	Record.AddStmt(VE);
8493	}
8494
8495	void OMPClauseWriter::VisitOMPOrderClause(OMPOrderClause *C) {
8496	Record.writeEnum(C->getKind());
8497	Record.writeEnum(C->getModifier());
8498	Record.AddSourceLocation(Loc: C->getLParenLoc());
8499	Record.AddSourceLocation(Loc: C->getKindKwLoc());
8500	Record.AddSourceLocation(Loc: C->getModifierKwLoc());
8501	}
8502
8503	void OMPClauseWriter::VisitOMPUsesAllocatorsClause(OMPUsesAllocatorsClause *C) {
8504	Record.push_back(N: C->getNumberOfAllocators());
8505	Record.AddSourceLocation(Loc: C->getLParenLoc());
8506	for (unsigned I = 0, E = C->getNumberOfAllocators(); I < E; ++I) {
8507	OMPUsesAllocatorsClause::Data Data = C->getAllocatorData(I);
8508	Record.AddStmt(Data.Allocator);
8509	Record.AddStmt(Data.AllocatorTraits);
8510	Record.AddSourceLocation(Loc: Data.LParenLoc);
8511	Record.AddSourceLocation(Loc: Data.RParenLoc);
8512	}
8513	}
8514
8515	void OMPClauseWriter::VisitOMPAffinityClause(OMPAffinityClause *C) {
8516	Record.push_back(N: C->varlist_size());
8517	Record.AddSourceLocation(Loc: C->getLParenLoc());
8518	Record.AddStmt(C->getModifier());
8519	Record.AddSourceLocation(Loc: C->getColonLoc());
8520	for (Expr *E : C->varlist())
8521	Record.AddStmt(E);
8522	}
8523
8524	void OMPClauseWriter::VisitOMPBindClause(OMPBindClause *C) {
8525	Record.writeEnum(C->getBindKind());
8526	Record.AddSourceLocation(Loc: C->getLParenLoc());
8527	Record.AddSourceLocation(Loc: C->getBindKindLoc());
8528	}
8529
8530	void OMPClauseWriter::VisitOMPXDynCGroupMemClause(OMPXDynCGroupMemClause *C) {
8531	VisitOMPClauseWithPreInit(C);
8532	Record.AddStmt(C->getSize());
8533	Record.AddSourceLocation(Loc: C->getLParenLoc());
8534	}
8535
8536	void OMPClauseWriter::VisitOMPDoacrossClause(OMPDoacrossClause *C) {
8537	Record.push_back(N: C->varlist_size());
8538	Record.push_back(N: C->getNumLoops());
8539	Record.AddSourceLocation(Loc: C->getLParenLoc());
8540	Record.push_back(N: C->getDependenceType());
8541	Record.AddSourceLocation(Loc: C->getDependenceLoc());
8542	Record.AddSourceLocation(Loc: C->getColonLoc());
8543	for (auto *VE : C->varlist())
8544	Record.AddStmt(VE);
8545	for (unsigned I = 0, E = C->getNumLoops(); I < E; ++I)
8546	Record.AddStmt(C->getLoopData(NumLoop: I));
8547	}
8548
8549	void OMPClauseWriter::VisitOMPXAttributeClause(OMPXAttributeClause *C) {
8550	Record.AddAttributes(Attrs: C->getAttrs());
8551	Record.AddSourceLocation(Loc: C->getBeginLoc());
8552	Record.AddSourceLocation(Loc: C->getLParenLoc());
8553	Record.AddSourceLocation(Loc: C->getEndLoc());
8554	}
8555
8556	void OMPClauseWriter::VisitOMPXBareClause(OMPXBareClause *C) {}
8557
8558	void ASTRecordWriter::writeOMPTraitInfo(const OMPTraitInfo *TI) {
8559	writeUInt32(Value: TI->Sets.size());
8560	for (const auto &Set : TI->Sets) {
8561	writeEnum(Set.Kind);
8562	writeUInt32(Set.Selectors.size());
8563	for (const auto &Selector : Set.Selectors) {
8564	writeEnum(Selector.Kind);
8565	writeBool(Selector.ScoreOrCondition);
8566	if (Selector.ScoreOrCondition)
8567	writeExprRef(Selector.ScoreOrCondition);
8568	writeUInt32(Selector.Properties.size());
8569	for (const auto &Property : Selector.Properties)
8570	writeEnum(Property.Kind);
8571	}
8572	}
8573	}
8574
8575	void ASTRecordWriter::writeOMPChildren(OMPChildren *Data) {
8576	if (!Data)
8577	return;
8578	writeUInt32(Value: Data->getNumClauses());
8579	writeUInt32(Value: Data->getNumChildren());
8580	writeBool(Value: Data->hasAssociatedStmt());
8581	for (unsigned I = 0, E = Data->getNumClauses(); I < E; ++I)
8582	writeOMPClause(C: Data->getClauses()[I]);
8583	if (Data->hasAssociatedStmt())
8584	AddStmt(S: Data->getAssociatedStmt());
8585	for (unsigned I = 0, E = Data->getNumChildren(); I < E; ++I)
8586	AddStmt(S: Data->getChildren()[I]);
8587	}
8588
8589	void ASTRecordWriter::writeOpenACCVarList(const OpenACCClauseWithVarList *C) {
8590	writeUInt32(Value: C->getVarList().size());
8591	for (Expr *E : C->getVarList())
8592	AddStmt(E);
8593	}
8594
8595	void ASTRecordWriter::writeOpenACCIntExprList(ArrayRef<Expr *> Exprs) {
8596	writeUInt32(Value: Exprs.size());
8597	for (Expr *E : Exprs)
8598	AddStmt(E);
8599	}
8600
8601	void ASTRecordWriter::writeOpenACCClause(const OpenACCClause *C) {
8602	writeEnum(C->getClauseKind());
8603	writeSourceLocation(Loc: C->getBeginLoc());
8604	writeSourceLocation(Loc: C->getEndLoc());
8605
8606	switch (C->getClauseKind()) {
8607	case OpenACCClauseKind::Default: {
8608	const auto *DC = cast<OpenACCDefaultClause>(Val: C);
8609	writeSourceLocation(Loc: DC->getLParenLoc());
8610	writeEnum(DC->getDefaultClauseKind());
8611	return;
8612	}
8613	case OpenACCClauseKind::If: {
8614	const auto *IC = cast<OpenACCIfClause>(Val: C);
8615	writeSourceLocation(Loc: IC->getLParenLoc());
8616	AddStmt(const_cast<Expr*>(IC->getConditionExpr()));
8617	return;
8618	}
8619	case OpenACCClauseKind::Self: {
8620	const auto *SC = cast<OpenACCSelfClause>(Val: C);
8621	writeSourceLocation(Loc: SC->getLParenLoc());
8622	writeBool(Value: SC->isConditionExprClause());
8623	if (SC->isConditionExprClause()) {
8624	writeBool(Value: SC->hasConditionExpr());
8625	if (SC->hasConditionExpr())
8626	AddStmt(const_cast<Expr *>(SC->getConditionExpr()));
8627	} else {
8628	writeUInt32(Value: SC->getVarList().size());
8629	for (Expr *E : SC->getVarList())
8630	AddStmt(E);
8631	}
8632	return;
8633	}
8634	case OpenACCClauseKind::NumGangs: {
8635	const auto *NGC = cast<OpenACCNumGangsClause>(Val: C);
8636	writeSourceLocation(Loc: NGC->getLParenLoc());
8637	writeUInt32(Value: NGC->getIntExprs().size());
8638	for (Expr *E : NGC->getIntExprs())
8639	AddStmt(E);
8640	return;
8641	}
8642	case OpenACCClauseKind::DeviceNum: {
8643	const auto *DNC = cast<OpenACCDeviceNumClause>(Val: C);
8644	writeSourceLocation(Loc: DNC->getLParenLoc());
8645	AddStmt(const_cast<Expr*>(DNC->getIntExpr()));
8646	return;
8647	}
8648	case OpenACCClauseKind::DefaultAsync: {
8649	const auto *DAC = cast<OpenACCDefaultAsyncClause>(Val: C);
8650	writeSourceLocation(Loc: DAC->getLParenLoc());
8651	AddStmt(const_cast<Expr *>(DAC->getIntExpr()));
8652	return;
8653	}
8654	case OpenACCClauseKind::NumWorkers: {
8655	const auto *NWC = cast<OpenACCNumWorkersClause>(Val: C);
8656	writeSourceLocation(Loc: NWC->getLParenLoc());
8657	AddStmt(const_cast<Expr*>(NWC->getIntExpr()));
8658	return;
8659	}
8660	case OpenACCClauseKind::VectorLength: {
8661	const auto *NWC = cast<OpenACCVectorLengthClause>(Val: C);
8662	writeSourceLocation(Loc: NWC->getLParenLoc());
8663	AddStmt(const_cast<Expr*>(NWC->getIntExpr()));
8664	return;
8665	}
8666	case OpenACCClauseKind::Private: {
8667	const auto *PC = cast<OpenACCPrivateClause>(Val: C);
8668	writeSourceLocation(Loc: PC->getLParenLoc());
8669	writeOpenACCVarList(C: PC);
8670	return;
8671	}
8672	case OpenACCClauseKind::Host: {
8673	const auto *HC = cast<OpenACCHostClause>(Val: C);
8674	writeSourceLocation(Loc: HC->getLParenLoc());
8675	writeOpenACCVarList(C: HC);
8676	return;
8677	}
8678	case OpenACCClauseKind::Device: {
8679	const auto *DC = cast<OpenACCDeviceClause>(Val: C);
8680	writeSourceLocation(Loc: DC->getLParenLoc());
8681	writeOpenACCVarList(C: DC);
8682	return;
8683	}
8684	case OpenACCClauseKind::FirstPrivate: {
8685	const auto *FPC = cast<OpenACCFirstPrivateClause>(Val: C);
8686	writeSourceLocation(Loc: FPC->getLParenLoc());
8687	writeOpenACCVarList(C: FPC);
8688	return;
8689	}
8690	case OpenACCClauseKind::Attach: {
8691	const auto *AC = cast<OpenACCAttachClause>(Val: C);
8692	writeSourceLocation(Loc: AC->getLParenLoc());
8693	writeOpenACCVarList(C: AC);
8694	return;
8695	}
8696	case OpenACCClauseKind::Detach: {
8697	const auto *DC = cast<OpenACCDetachClause>(Val: C);
8698	writeSourceLocation(Loc: DC->getLParenLoc());
8699	writeOpenACCVarList(C: DC);
8700	return;
8701	}
8702	case OpenACCClauseKind::Delete: {
8703	const auto *DC = cast<OpenACCDeleteClause>(Val: C);
8704	writeSourceLocation(Loc: DC->getLParenLoc());
8705	writeOpenACCVarList(C: DC);
8706	return;
8707	}
8708	case OpenACCClauseKind::UseDevice: {
8709	const auto *UDC = cast<OpenACCUseDeviceClause>(Val: C);
8710	writeSourceLocation(Loc: UDC->getLParenLoc());
8711	writeOpenACCVarList(C: UDC);
8712	return;
8713	}
8714	case OpenACCClauseKind::DevicePtr: {
8715	const auto *DPC = cast<OpenACCDevicePtrClause>(Val: C);
8716	writeSourceLocation(Loc: DPC->getLParenLoc());
8717	writeOpenACCVarList(C: DPC);
8718	return;
8719	}
8720	case OpenACCClauseKind::NoCreate: {
8721	const auto *NCC = cast<OpenACCNoCreateClause>(Val: C);
8722	writeSourceLocation(Loc: NCC->getLParenLoc());
8723	writeOpenACCVarList(C: NCC);
8724	return;
8725	}
8726	case OpenACCClauseKind::Present: {
8727	const auto *PC = cast<OpenACCPresentClause>(Val: C);
8728	writeSourceLocation(Loc: PC->getLParenLoc());
8729	writeOpenACCVarList(C: PC);
8730	return;
8731	}
8732	case OpenACCClauseKind::Copy:
8733	case OpenACCClauseKind::PCopy:
8734	case OpenACCClauseKind::PresentOrCopy: {
8735	const auto *CC = cast<OpenACCCopyClause>(Val: C);
8736	writeSourceLocation(Loc: CC->getLParenLoc());
8737	writeEnum(CC->getModifierList());
8738	writeOpenACCVarList(C: CC);
8739	return;
8740	}
8741	case OpenACCClauseKind::CopyIn:
8742	case OpenACCClauseKind::PCopyIn:
8743	case OpenACCClauseKind::PresentOrCopyIn: {
8744	const auto *CIC = cast<OpenACCCopyInClause>(Val: C);
8745	writeSourceLocation(Loc: CIC->getLParenLoc());
8746	writeEnum(CIC->getModifierList());
8747	writeOpenACCVarList(C: CIC);
8748	return;
8749	}
8750	case OpenACCClauseKind::CopyOut:
8751	case OpenACCClauseKind::PCopyOut:
8752	case OpenACCClauseKind::PresentOrCopyOut: {
8753	const auto *COC = cast<OpenACCCopyOutClause>(Val: C);
8754	writeSourceLocation(Loc: COC->getLParenLoc());
8755	writeEnum(COC->getModifierList());
8756	writeOpenACCVarList(C: COC);
8757	return;
8758	}
8759	case OpenACCClauseKind::Create:
8760	case OpenACCClauseKind::PCreate:
8761	case OpenACCClauseKind::PresentOrCreate: {
8762	const auto *CC = cast<OpenACCCreateClause>(Val: C);
8763	writeSourceLocation(Loc: CC->getLParenLoc());
8764	writeEnum(CC->getModifierList());
8765	writeOpenACCVarList(C: CC);
8766	return;
8767	}
8768	case OpenACCClauseKind::Async: {
8769	const auto *AC = cast<OpenACCAsyncClause>(Val: C);
8770	writeSourceLocation(Loc: AC->getLParenLoc());
8771	writeBool(Value: AC->hasIntExpr());
8772	if (AC->hasIntExpr())
8773	AddStmt(const_cast<Expr*>(AC->getIntExpr()));
8774	return;
8775	}
8776	case OpenACCClauseKind::Wait: {
8777	const auto *WC = cast<OpenACCWaitClause>(Val: C);
8778	writeSourceLocation(Loc: WC->getLParenLoc());
8779	writeBool(Value: WC->getDevNumExpr());
8780	if (Expr *DNE = WC->getDevNumExpr())
8781	AddStmt(DNE);
8782	writeSourceLocation(Loc: WC->getQueuesLoc());
8783
8784	writeOpenACCIntExprList(Exprs: WC->getQueueIdExprs());
8785	return;
8786	}
8787	case OpenACCClauseKind::DeviceType:
8788	case OpenACCClauseKind::DType: {
8789	const auto *DTC = cast<OpenACCDeviceTypeClause>(Val: C);
8790	writeSourceLocation(Loc: DTC->getLParenLoc());
8791	writeUInt32(Value: DTC->getArchitectures().size());
8792	for (const DeviceTypeArgument &Arg : DTC->getArchitectures()) {
8793	writeBool(Value: Arg.getIdentifierInfo());
8794	if (Arg.getIdentifierInfo())
8795	AddIdentifierRef(II: Arg.getIdentifierInfo());
8796	writeSourceLocation(Loc: Arg.getLoc());
8797	}
8798	return;
8799	}
8800	case OpenACCClauseKind::Reduction: {
8801	const auto *RC = cast<OpenACCReductionClause>(Val: C);
8802	writeSourceLocation(Loc: RC->getLParenLoc());
8803	writeEnum(RC->getReductionOp());
8804	writeOpenACCVarList(C: RC);
8805	return;
8806	}
8807	case OpenACCClauseKind::Seq:
8808	case OpenACCClauseKind::Independent:
8809	case OpenACCClauseKind::NoHost:
8810	case OpenACCClauseKind::Auto:
8811	case OpenACCClauseKind::Finalize:
8812	case OpenACCClauseKind::IfPresent:
8813	// Nothing to do here, there is no additional information beyond the
8814	// begin/end loc and clause kind.
8815	return;
8816	case OpenACCClauseKind::Collapse: {
8817	const auto *CC = cast<OpenACCCollapseClause>(Val: C);
8818	writeSourceLocation(Loc: CC->getLParenLoc());
8819	writeBool(Value: CC->hasForce());
8820	AddStmt(const_cast<Expr *>(CC->getLoopCount()));
8821	return;
8822	}
8823	case OpenACCClauseKind::Tile: {
8824	const auto *TC = cast<OpenACCTileClause>(Val: C);
8825	writeSourceLocation(Loc: TC->getLParenLoc());
8826	writeUInt32(Value: TC->getSizeExprs().size());
8827	for (Expr *E : TC->getSizeExprs())
8828	AddStmt(E);
8829	return;
8830	}
8831	case OpenACCClauseKind::Gang: {
8832	const auto *GC = cast<OpenACCGangClause>(Val: C);
8833	writeSourceLocation(Loc: GC->getLParenLoc());
8834	writeUInt32(Value: GC->getNumExprs());
8835	for (unsigned I = 0; I < GC->getNumExprs(); ++I) {
8836	writeEnum(GC->getExpr(I).first);
8837	AddStmt(const_cast<Expr *>(GC->getExpr(I).second));
8838	}
8839	return;
8840	}
8841	case OpenACCClauseKind::Worker: {
8842	const auto *WC = cast<OpenACCWorkerClause>(Val: C);
8843	writeSourceLocation(Loc: WC->getLParenLoc());
8844	writeBool(Value: WC->hasIntExpr());
8845	if (WC->hasIntExpr())
8846	AddStmt(const_cast<Expr *>(WC->getIntExpr()));
8847	return;
8848	}
8849	case OpenACCClauseKind::Vector: {
8850	const auto *VC = cast<OpenACCVectorClause>(Val: C);
8851	writeSourceLocation(Loc: VC->getLParenLoc());
8852	writeBool(Value: VC->hasIntExpr());
8853	if (VC->hasIntExpr())
8854	AddStmt(const_cast<Expr *>(VC->getIntExpr()));
8855	return;
8856	}
8857	case OpenACCClauseKind::Link: {
8858	const auto *LC = cast<OpenACCLinkClause>(Val: C);
8859	writeSourceLocation(Loc: LC->getLParenLoc());
8860	writeOpenACCVarList(C: LC);
8861	return;
8862	}
8863	case OpenACCClauseKind::DeviceResident: {
8864	const auto *DRC = cast<OpenACCDeviceResidentClause>(Val: C);
8865	writeSourceLocation(Loc: DRC->getLParenLoc());
8866	writeOpenACCVarList(C: DRC);
8867	return;
8868	}
8869
8870	case OpenACCClauseKind::Bind: {
8871	const auto *BC = cast<OpenACCBindClause>(Val: C);
8872	writeSourceLocation(Loc: BC->getLParenLoc());
8873	writeBool(Value: BC->isStringArgument());
8874	if (BC->isStringArgument())
8875	AddStmt(const_cast<StringLiteral *>(BC->getStringArgument()));
8876	else
8877	AddIdentifierRef(II: BC->getIdentifierArgument());
8878
8879	return;
8880	}
8881	case OpenACCClauseKind::Invalid:
8882	case OpenACCClauseKind::Shortloop:
8883	llvm_unreachable("Clause serialization not yet implemented");
8884	}
8885	llvm_unreachable("Invalid Clause Kind");
8886	}
8887
8888	void ASTRecordWriter::writeOpenACCClauseList(
8889	ArrayRef<const OpenACCClause *> Clauses) {
8890	for (const OpenACCClause *Clause : Clauses)
8891	writeOpenACCClause(C: Clause);
8892	}
8893	void ASTRecordWriter::AddOpenACCRoutineDeclAttr(
8894	const OpenACCRoutineDeclAttr *A) {
8895	// We have to write the size so that the reader can do a resize. Unlike the
8896	// Decl version of this, we can't count on trailing storage to get this right.
8897	writeUInt32(Value: A->Clauses.size());
8898	writeOpenACCClauseList(Clauses: A->Clauses);
8899	}
8900