1 //===- ASTReaderDecl.cpp - Decl Deserialization ---------------------------===//
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 implements the ASTReader::readDeclRecord method, which is the
10 // entrypoint for loading a decl.
11 //
12 //===----------------------------------------------------------------------===//
13
14 #include "ASTCommon.h"
15 #include "ASTReaderInternals.h"
16 #include "clang/AST/ASTContext.h"
17 #include "clang/AST/Attr.h"
18 #include "clang/AST/AttrIterator.h"
19 #include "clang/AST/Decl.h"
20 #include "clang/AST/DeclBase.h"
21 #include "clang/AST/DeclCXX.h"
22 #include "clang/AST/DeclFriend.h"
23 #include "clang/AST/DeclObjC.h"
24 #include "clang/AST/DeclOpenMP.h"
25 #include "clang/AST/DeclTemplate.h"
26 #include "clang/AST/DeclVisitor.h"
27 #include "clang/AST/DeclarationName.h"
28 #include "clang/AST/Expr.h"
29 #include "clang/AST/ExternalASTSource.h"
30 #include "clang/AST/LambdaCapture.h"
31 #include "clang/AST/NestedNameSpecifier.h"
32 #include "clang/AST/OpenMPClause.h"
33 #include "clang/AST/Redeclarable.h"
34 #include "clang/AST/Stmt.h"
35 #include "clang/AST/TemplateBase.h"
36 #include "clang/AST/Type.h"
37 #include "clang/AST/UnresolvedSet.h"
38 #include "clang/Basic/AttrKinds.h"
39 #include "clang/Basic/ExceptionSpecificationType.h"
40 #include "clang/Basic/IdentifierTable.h"
41 #include "clang/Basic/LLVM.h"
42 #include "clang/Basic/Lambda.h"
43 #include "clang/Basic/LangOptions.h"
44 #include "clang/Basic/Linkage.h"
45 #include "clang/Basic/Module.h"
46 #include "clang/Basic/PragmaKinds.h"
47 #include "clang/Basic/SourceLocation.h"
48 #include "clang/Basic/Specifiers.h"
49 #include "clang/Sema/IdentifierResolver.h"
50 #include "clang/Serialization/ASTBitCodes.h"
51 #include "clang/Serialization/ASTRecordReader.h"
52 #include "clang/Serialization/ContinuousRangeMap.h"
53 #include "clang/Serialization/ModuleFile.h"
54 #include "llvm/ADT/DenseMap.h"
55 #include "llvm/ADT/FoldingSet.h"
56 #include "llvm/ADT/STLExtras.h"
57 #include "llvm/ADT/SmallPtrSet.h"
58 #include "llvm/ADT/SmallVector.h"
59 #include "llvm/ADT/iterator_range.h"
60 #include "llvm/Bitstream/BitstreamReader.h"
61 #include "llvm/Support/Casting.h"
62 #include "llvm/Support/ErrorHandling.h"
63 #include "llvm/Support/SaveAndRestore.h"
64 #include <algorithm>
65 #include <cassert>
66 #include <cstdint>
67 #include <cstring>
68 #include <string>
69 #include <utility>
70
71 using namespace clang;
72 using namespace serialization;
73
74 //===----------------------------------------------------------------------===//
75 // Declaration deserialization
76 //===----------------------------------------------------------------------===//
77
78 namespace clang {
79
80 class ASTDeclReader : public DeclVisitor<ASTDeclReader, void> {
81 ASTReader &Reader;
82 ASTRecordReader &Record;
83 ASTReader::RecordLocation Loc;
84 const DeclID ThisDeclID;
85 const SourceLocation ThisDeclLoc;
86
87 using RecordData = ASTReader::RecordData;
88
89 TypeID DeferredTypeID = 0;
90 unsigned AnonymousDeclNumber;
91 GlobalDeclID NamedDeclForTagDecl = 0;
92 IdentifierInfo *TypedefNameForLinkage = nullptr;
93
94 bool HasPendingBody = false;
95
96 ///A flag to carry the information for a decl from the entity is
97 /// used. We use it to delay the marking of the canonical decl as used until
98 /// the entire declaration is deserialized and merged.
99 bool IsDeclMarkedUsed = false;
100
101 uint64_t GetCurrentCursorOffset();
102
ReadLocalOffset()103 uint64_t ReadLocalOffset() {
104 uint64_t LocalOffset = Record.readInt();
105 assert(LocalOffset < Loc.Offset && "offset point after current record");
106 return LocalOffset ? Loc.Offset - LocalOffset : 0;
107 }
108
ReadGlobalOffset()109 uint64_t ReadGlobalOffset() {
110 uint64_t Local = ReadLocalOffset();
111 return Local ? Record.getGlobalBitOffset(Local) : 0;
112 }
113
readSourceLocation()114 SourceLocation readSourceLocation() {
115 return Record.readSourceLocation();
116 }
117
readSourceRange()118 SourceRange readSourceRange() {
119 return Record.readSourceRange();
120 }
121
readTypeSourceInfo()122 TypeSourceInfo *readTypeSourceInfo() {
123 return Record.readTypeSourceInfo();
124 }
125
readDeclID()126 serialization::DeclID readDeclID() {
127 return Record.readDeclID();
128 }
129
readString()130 std::string readString() {
131 return Record.readString();
132 }
133
readDeclIDList(SmallVectorImpl<DeclID> & IDs)134 void readDeclIDList(SmallVectorImpl<DeclID> &IDs) {
135 for (unsigned I = 0, Size = Record.readInt(); I != Size; ++I)
136 IDs.push_back(readDeclID());
137 }
138
readDecl()139 Decl *readDecl() {
140 return Record.readDecl();
141 }
142
143 template<typename T>
readDeclAs()144 T *readDeclAs() {
145 return Record.readDeclAs<T>();
146 }
147
readSubmoduleID()148 serialization::SubmoduleID readSubmoduleID() {
149 if (Record.getIdx() == Record.size())
150 return 0;
151
152 return Record.getGlobalSubmoduleID(Record.readInt());
153 }
154
readModule()155 Module *readModule() {
156 return Record.getSubmodule(readSubmoduleID());
157 }
158
159 void ReadCXXRecordDefinition(CXXRecordDecl *D, bool Update);
160 void ReadCXXDefinitionData(struct CXXRecordDecl::DefinitionData &Data,
161 const CXXRecordDecl *D);
162 void MergeDefinitionData(CXXRecordDecl *D,
163 struct CXXRecordDecl::DefinitionData &&NewDD);
164 void ReadObjCDefinitionData(struct ObjCInterfaceDecl::DefinitionData &Data);
165 void MergeDefinitionData(ObjCInterfaceDecl *D,
166 struct ObjCInterfaceDecl::DefinitionData &&NewDD);
167 void ReadObjCDefinitionData(struct ObjCProtocolDecl::DefinitionData &Data);
168 void MergeDefinitionData(ObjCProtocolDecl *D,
169 struct ObjCProtocolDecl::DefinitionData &&NewDD);
170
171 static DeclContext *getPrimaryDCForAnonymousDecl(DeclContext *LexicalDC);
172
173 static NamedDecl *getAnonymousDeclForMerging(ASTReader &Reader,
174 DeclContext *DC,
175 unsigned Index);
176 static void setAnonymousDeclForMerging(ASTReader &Reader, DeclContext *DC,
177 unsigned Index, NamedDecl *D);
178
179 /// Results from loading a RedeclarableDecl.
180 class RedeclarableResult {
181 Decl *MergeWith;
182 GlobalDeclID FirstID;
183 bool IsKeyDecl;
184
185 public:
RedeclarableResult(Decl * MergeWith,GlobalDeclID FirstID,bool IsKeyDecl)186 RedeclarableResult(Decl *MergeWith, GlobalDeclID FirstID, bool IsKeyDecl)
187 : MergeWith(MergeWith), FirstID(FirstID), IsKeyDecl(IsKeyDecl) {}
188
189 /// Retrieve the first ID.
getFirstID() const190 GlobalDeclID getFirstID() const { return FirstID; }
191
192 /// Is this declaration a key declaration?
isKeyDecl() const193 bool isKeyDecl() const { return IsKeyDecl; }
194
195 /// Get a known declaration that this should be merged with, if
196 /// any.
getKnownMergeTarget() const197 Decl *getKnownMergeTarget() const { return MergeWith; }
198 };
199
200 /// Class used to capture the result of searching for an existing
201 /// declaration of a specific kind and name, along with the ability
202 /// to update the place where this result was found (the declaration
203 /// chain hanging off an identifier or the DeclContext we searched in)
204 /// if requested.
205 class FindExistingResult {
206 ASTReader &Reader;
207 NamedDecl *New = nullptr;
208 NamedDecl *Existing = nullptr;
209 bool AddResult = false;
210 unsigned AnonymousDeclNumber = 0;
211 IdentifierInfo *TypedefNameForLinkage = nullptr;
212
213 public:
FindExistingResult(ASTReader & Reader)214 FindExistingResult(ASTReader &Reader) : Reader(Reader) {}
215
FindExistingResult(ASTReader & Reader,NamedDecl * New,NamedDecl * Existing,unsigned AnonymousDeclNumber,IdentifierInfo * TypedefNameForLinkage)216 FindExistingResult(ASTReader &Reader, NamedDecl *New, NamedDecl *Existing,
217 unsigned AnonymousDeclNumber,
218 IdentifierInfo *TypedefNameForLinkage)
219 : Reader(Reader), New(New), Existing(Existing), AddResult(true),
220 AnonymousDeclNumber(AnonymousDeclNumber),
221 TypedefNameForLinkage(TypedefNameForLinkage) {}
222
FindExistingResult(FindExistingResult && Other)223 FindExistingResult(FindExistingResult &&Other)
224 : Reader(Other.Reader), New(Other.New), Existing(Other.Existing),
225 AddResult(Other.AddResult),
226 AnonymousDeclNumber(Other.AnonymousDeclNumber),
227 TypedefNameForLinkage(Other.TypedefNameForLinkage) {
228 Other.AddResult = false;
229 }
230
231 FindExistingResult &operator=(FindExistingResult &&) = delete;
232 ~FindExistingResult();
233
234 /// Suppress the addition of this result into the known set of
235 /// names.
suppress()236 void suppress() { AddResult = false; }
237
operator NamedDecl*() const238 operator NamedDecl*() const { return Existing; }
239
240 template<typename T>
operator T*() const241 operator T*() const { return dyn_cast_or_null<T>(Existing); }
242 };
243
244 static DeclContext *getPrimaryContextForMerging(ASTReader &Reader,
245 DeclContext *DC);
246 FindExistingResult findExisting(NamedDecl *D);
247
248 public:
ASTDeclReader(ASTReader & Reader,ASTRecordReader & Record,ASTReader::RecordLocation Loc,DeclID thisDeclID,SourceLocation ThisDeclLoc)249 ASTDeclReader(ASTReader &Reader, ASTRecordReader &Record,
250 ASTReader::RecordLocation Loc,
251 DeclID thisDeclID, SourceLocation ThisDeclLoc)
252 : Reader(Reader), Record(Record), Loc(Loc), ThisDeclID(thisDeclID),
253 ThisDeclLoc(ThisDeclLoc) {}
254
255 template <typename T> static
AddLazySpecializations(T * D,SmallVectorImpl<serialization::DeclID> & IDs)256 void AddLazySpecializations(T *D,
257 SmallVectorImpl<serialization::DeclID>& IDs) {
258 if (IDs.empty())
259 return;
260
261 // FIXME: We should avoid this pattern of getting the ASTContext.
262 ASTContext &C = D->getASTContext();
263
264 auto *&LazySpecializations = D->getCommonPtr()->LazySpecializations;
265
266 if (auto &Old = LazySpecializations) {
267 IDs.insert(IDs.end(), Old + 1, Old + 1 + Old[0]);
268 llvm::sort(IDs);
269 IDs.erase(std::unique(IDs.begin(), IDs.end()), IDs.end());
270 }
271
272 auto *Result = new (C) serialization::DeclID[1 + IDs.size()];
273 *Result = IDs.size();
274 std::copy(IDs.begin(), IDs.end(), Result + 1);
275
276 LazySpecializations = Result;
277 }
278
279 template <typename DeclT>
280 static Decl *getMostRecentDeclImpl(Redeclarable<DeclT> *D);
281 static Decl *getMostRecentDeclImpl(...);
282 static Decl *getMostRecentDecl(Decl *D);
283
284 template <typename DeclT>
285 static void attachPreviousDeclImpl(ASTReader &Reader,
286 Redeclarable<DeclT> *D, Decl *Previous,
287 Decl *Canon);
288 static void attachPreviousDeclImpl(ASTReader &Reader, ...);
289 static void attachPreviousDecl(ASTReader &Reader, Decl *D, Decl *Previous,
290 Decl *Canon);
291
292 template <typename DeclT>
293 static void attachLatestDeclImpl(Redeclarable<DeclT> *D, Decl *Latest);
294 static void attachLatestDeclImpl(...);
295 static void attachLatestDecl(Decl *D, Decl *latest);
296
297 template <typename DeclT>
298 static void markIncompleteDeclChainImpl(Redeclarable<DeclT> *D);
299 static void markIncompleteDeclChainImpl(...);
300
301 /// Determine whether this declaration has a pending body.
hasPendingBody() const302 bool hasPendingBody() const { return HasPendingBody; }
303
304 void ReadFunctionDefinition(FunctionDecl *FD);
305 void Visit(Decl *D);
306
307 void UpdateDecl(Decl *D, SmallVectorImpl<serialization::DeclID> &);
308
setNextObjCCategory(ObjCCategoryDecl * Cat,ObjCCategoryDecl * Next)309 static void setNextObjCCategory(ObjCCategoryDecl *Cat,
310 ObjCCategoryDecl *Next) {
311 Cat->NextClassCategory = Next;
312 }
313
314 void VisitDecl(Decl *D);
315 void VisitPragmaCommentDecl(PragmaCommentDecl *D);
316 void VisitPragmaDetectMismatchDecl(PragmaDetectMismatchDecl *D);
317 void VisitTranslationUnitDecl(TranslationUnitDecl *TU);
318 void VisitNamedDecl(NamedDecl *ND);
319 void VisitLabelDecl(LabelDecl *LD);
320 void VisitNamespaceDecl(NamespaceDecl *D);
321 void VisitUsingDirectiveDecl(UsingDirectiveDecl *D);
322 void VisitNamespaceAliasDecl(NamespaceAliasDecl *D);
323 void VisitTypeDecl(TypeDecl *TD);
324 RedeclarableResult VisitTypedefNameDecl(TypedefNameDecl *TD);
325 void VisitTypedefDecl(TypedefDecl *TD);
326 void VisitTypeAliasDecl(TypeAliasDecl *TD);
327 void VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D);
328 RedeclarableResult VisitTagDecl(TagDecl *TD);
329 void VisitEnumDecl(EnumDecl *ED);
330 RedeclarableResult VisitRecordDeclImpl(RecordDecl *RD);
VisitRecordDecl(RecordDecl * RD)331 void VisitRecordDecl(RecordDecl *RD) { VisitRecordDeclImpl(RD); }
332 RedeclarableResult VisitCXXRecordDeclImpl(CXXRecordDecl *D);
VisitCXXRecordDecl(CXXRecordDecl * D)333 void VisitCXXRecordDecl(CXXRecordDecl *D) { VisitCXXRecordDeclImpl(D); }
334 RedeclarableResult VisitClassTemplateSpecializationDeclImpl(
335 ClassTemplateSpecializationDecl *D);
336
VisitClassTemplateSpecializationDecl(ClassTemplateSpecializationDecl * D)337 void VisitClassTemplateSpecializationDecl(
338 ClassTemplateSpecializationDecl *D) {
339 VisitClassTemplateSpecializationDeclImpl(D);
340 }
341
342 void VisitClassTemplatePartialSpecializationDecl(
343 ClassTemplatePartialSpecializationDecl *D);
344 void VisitClassScopeFunctionSpecializationDecl(
345 ClassScopeFunctionSpecializationDecl *D);
346 RedeclarableResult
347 VisitVarTemplateSpecializationDeclImpl(VarTemplateSpecializationDecl *D);
348
VisitVarTemplateSpecializationDecl(VarTemplateSpecializationDecl * D)349 void VisitVarTemplateSpecializationDecl(VarTemplateSpecializationDecl *D) {
350 VisitVarTemplateSpecializationDeclImpl(D);
351 }
352
353 void VisitVarTemplatePartialSpecializationDecl(
354 VarTemplatePartialSpecializationDecl *D);
355 void VisitTemplateTypeParmDecl(TemplateTypeParmDecl *D);
356 void VisitValueDecl(ValueDecl *VD);
357 void VisitEnumConstantDecl(EnumConstantDecl *ECD);
358 void VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D);
359 void VisitDeclaratorDecl(DeclaratorDecl *DD);
360 void VisitFunctionDecl(FunctionDecl *FD);
361 void VisitCXXDeductionGuideDecl(CXXDeductionGuideDecl *GD);
362 void VisitCXXMethodDecl(CXXMethodDecl *D);
363 void VisitCXXConstructorDecl(CXXConstructorDecl *D);
364 void VisitCXXDestructorDecl(CXXDestructorDecl *D);
365 void VisitCXXConversionDecl(CXXConversionDecl *D);
366 void VisitFieldDecl(FieldDecl *FD);
367 void VisitMSPropertyDecl(MSPropertyDecl *FD);
368 void VisitMSGuidDecl(MSGuidDecl *D);
369 void VisitIndirectFieldDecl(IndirectFieldDecl *FD);
370 RedeclarableResult VisitVarDeclImpl(VarDecl *D);
VisitVarDecl(VarDecl * VD)371 void VisitVarDecl(VarDecl *VD) { VisitVarDeclImpl(VD); }
372 void VisitImplicitParamDecl(ImplicitParamDecl *PD);
373 void VisitParmVarDecl(ParmVarDecl *PD);
374 void VisitDecompositionDecl(DecompositionDecl *DD);
375 void VisitBindingDecl(BindingDecl *BD);
376 void VisitNonTypeTemplateParmDecl(NonTypeTemplateParmDecl *D);
377 DeclID VisitTemplateDecl(TemplateDecl *D);
378 void VisitConceptDecl(ConceptDecl *D);
379 void VisitRequiresExprBodyDecl(RequiresExprBodyDecl *D);
380 RedeclarableResult VisitRedeclarableTemplateDecl(RedeclarableTemplateDecl *D);
381 void VisitClassTemplateDecl(ClassTemplateDecl *D);
382 void VisitBuiltinTemplateDecl(BuiltinTemplateDecl *D);
383 void VisitVarTemplateDecl(VarTemplateDecl *D);
384 void VisitFunctionTemplateDecl(FunctionTemplateDecl *D);
385 void VisitTemplateTemplateParmDecl(TemplateTemplateParmDecl *D);
386 void VisitTypeAliasTemplateDecl(TypeAliasTemplateDecl *D);
387 void VisitUsingDecl(UsingDecl *D);
388 void VisitUsingPackDecl(UsingPackDecl *D);
389 void VisitUsingShadowDecl(UsingShadowDecl *D);
390 void VisitConstructorUsingShadowDecl(ConstructorUsingShadowDecl *D);
391 void VisitLinkageSpecDecl(LinkageSpecDecl *D);
392 void VisitExportDecl(ExportDecl *D);
393 void VisitFileScopeAsmDecl(FileScopeAsmDecl *AD);
394 void VisitImportDecl(ImportDecl *D);
395 void VisitAccessSpecDecl(AccessSpecDecl *D);
396 void VisitFriendDecl(FriendDecl *D);
397 void VisitFriendTemplateDecl(FriendTemplateDecl *D);
398 void VisitStaticAssertDecl(StaticAssertDecl *D);
399 void VisitBlockDecl(BlockDecl *BD);
400 void VisitCapturedDecl(CapturedDecl *CD);
401 void VisitEmptyDecl(EmptyDecl *D);
402 void VisitLifetimeExtendedTemporaryDecl(LifetimeExtendedTemporaryDecl *D);
403
404 std::pair<uint64_t, uint64_t> VisitDeclContext(DeclContext *DC);
405
406 template<typename T>
407 RedeclarableResult VisitRedeclarable(Redeclarable<T> *D);
408
409 template<typename T>
410 void mergeRedeclarable(Redeclarable<T> *D, RedeclarableResult &Redecl,
411 DeclID TemplatePatternID = 0);
412
413 template<typename T>
414 void mergeRedeclarable(Redeclarable<T> *D, T *Existing,
415 RedeclarableResult &Redecl,
416 DeclID TemplatePatternID = 0);
417
418 template<typename T>
419 void mergeMergeable(Mergeable<T> *D);
420
421 void mergeMergeable(LifetimeExtendedTemporaryDecl *D);
422
423 void mergeTemplatePattern(RedeclarableTemplateDecl *D,
424 RedeclarableTemplateDecl *Existing,
425 DeclID DsID, bool IsKeyDecl);
426
427 ObjCTypeParamList *ReadObjCTypeParamList();
428
429 // FIXME: Reorder according to DeclNodes.td?
430 void VisitObjCMethodDecl(ObjCMethodDecl *D);
431 void VisitObjCTypeParamDecl(ObjCTypeParamDecl *D);
432 void VisitObjCContainerDecl(ObjCContainerDecl *D);
433 void VisitObjCInterfaceDecl(ObjCInterfaceDecl *D);
434 void VisitObjCIvarDecl(ObjCIvarDecl *D);
435 void VisitObjCProtocolDecl(ObjCProtocolDecl *D);
436 void VisitObjCAtDefsFieldDecl(ObjCAtDefsFieldDecl *D);
437 void VisitObjCCategoryDecl(ObjCCategoryDecl *D);
438 void VisitObjCImplDecl(ObjCImplDecl *D);
439 void VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *D);
440 void VisitObjCImplementationDecl(ObjCImplementationDecl *D);
441 void VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *D);
442 void VisitObjCPropertyDecl(ObjCPropertyDecl *D);
443 void VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *D);
444 void VisitOMPThreadPrivateDecl(OMPThreadPrivateDecl *D);
445 void VisitOMPAllocateDecl(OMPAllocateDecl *D);
446 void VisitOMPDeclareReductionDecl(OMPDeclareReductionDecl *D);
447 void VisitOMPDeclareMapperDecl(OMPDeclareMapperDecl *D);
448 void VisitOMPRequiresDecl(OMPRequiresDecl *D);
449 void VisitOMPCapturedExprDecl(OMPCapturedExprDecl *D);
450 };
451
452 } // namespace clang
453
454 namespace {
455
456 /// Iterator over the redeclarations of a declaration that have already
457 /// been merged into the same redeclaration chain.
458 template<typename DeclT>
459 class MergedRedeclIterator {
460 DeclT *Start;
461 DeclT *Canonical = nullptr;
462 DeclT *Current = nullptr;
463
464 public:
465 MergedRedeclIterator() = default;
MergedRedeclIterator(DeclT * Start)466 MergedRedeclIterator(DeclT *Start) : Start(Start), Current(Start) {}
467
operator *()468 DeclT *operator*() { return Current; }
469
operator ++()470 MergedRedeclIterator &operator++() {
471 if (Current->isFirstDecl()) {
472 Canonical = Current;
473 Current = Current->getMostRecentDecl();
474 } else
475 Current = Current->getPreviousDecl();
476
477 // If we started in the merged portion, we'll reach our start position
478 // eventually. Otherwise, we'll never reach it, but the second declaration
479 // we reached was the canonical declaration, so stop when we see that one
480 // again.
481 if (Current == Start || Current == Canonical)
482 Current = nullptr;
483 return *this;
484 }
485
operator !=(const MergedRedeclIterator & A,const MergedRedeclIterator & B)486 friend bool operator!=(const MergedRedeclIterator &A,
487 const MergedRedeclIterator &B) {
488 return A.Current != B.Current;
489 }
490 };
491
492 } // namespace
493
494 template <typename DeclT>
495 static llvm::iterator_range<MergedRedeclIterator<DeclT>>
merged_redecls(DeclT * D)496 merged_redecls(DeclT *D) {
497 return llvm::make_range(MergedRedeclIterator<DeclT>(D),
498 MergedRedeclIterator<DeclT>());
499 }
500
GetCurrentCursorOffset()501 uint64_t ASTDeclReader::GetCurrentCursorOffset() {
502 return Loc.F->DeclsCursor.GetCurrentBitNo() + Loc.F->GlobalBitOffset;
503 }
504
ReadFunctionDefinition(FunctionDecl * FD)505 void ASTDeclReader::ReadFunctionDefinition(FunctionDecl *FD) {
506 if (Record.readInt()) {
507 Reader.DefinitionSource[FD] = Loc.F->Kind == ModuleKind::MK_MainFile;
508 if (Reader.getContext().getLangOpts().BuildingPCHWithObjectFile &&
509 Reader.DeclIsFromPCHWithObjectFile(FD))
510 Reader.DefinitionSource[FD] = true;
511 }
512 if (auto *CD = dyn_cast<CXXConstructorDecl>(FD)) {
513 CD->setNumCtorInitializers(Record.readInt());
514 if (CD->getNumCtorInitializers())
515 CD->CtorInitializers = ReadGlobalOffset();
516 }
517 // Store the offset of the body so we can lazily load it later.
518 Reader.PendingBodies[FD] = GetCurrentCursorOffset();
519 HasPendingBody = true;
520 }
521
Visit(Decl * D)522 void ASTDeclReader::Visit(Decl *D) {
523 DeclVisitor<ASTDeclReader, void>::Visit(D);
524
525 // At this point we have deserialized and merged the decl and it is safe to
526 // update its canonical decl to signal that the entire entity is used.
527 D->getCanonicalDecl()->Used |= IsDeclMarkedUsed;
528 IsDeclMarkedUsed = false;
529
530 if (auto *DD = dyn_cast<DeclaratorDecl>(D)) {
531 if (auto *TInfo = DD->getTypeSourceInfo())
532 Record.readTypeLoc(TInfo->getTypeLoc());
533 }
534
535 if (auto *TD = dyn_cast<TypeDecl>(D)) {
536 // We have a fully initialized TypeDecl. Read its type now.
537 TD->setTypeForDecl(Reader.GetType(DeferredTypeID).getTypePtrOrNull());
538
539 // If this is a tag declaration with a typedef name for linkage, it's safe
540 // to load that typedef now.
541 if (NamedDeclForTagDecl)
542 cast<TagDecl>(D)->TypedefNameDeclOrQualifier =
543 cast<TypedefNameDecl>(Reader.GetDecl(NamedDeclForTagDecl));
544 } else if (auto *ID = dyn_cast<ObjCInterfaceDecl>(D)) {
545 // if we have a fully initialized TypeDecl, we can safely read its type now.
546 ID->TypeForDecl = Reader.GetType(DeferredTypeID).getTypePtrOrNull();
547 } else if (auto *FD = dyn_cast<FunctionDecl>(D)) {
548 // FunctionDecl's body was written last after all other Stmts/Exprs.
549 // We only read it if FD doesn't already have a body (e.g., from another
550 // module).
551 // FIXME: Can we diagnose ODR violations somehow?
552 if (Record.readInt())
553 ReadFunctionDefinition(FD);
554 }
555 }
556
VisitDecl(Decl * D)557 void ASTDeclReader::VisitDecl(Decl *D) {
558 if (D->isTemplateParameter() || D->isTemplateParameterPack() ||
559 isa<ParmVarDecl>(D) || isa<ObjCTypeParamDecl>(D)) {
560 // We don't want to deserialize the DeclContext of a template
561 // parameter or of a parameter of a function template immediately. These
562 // entities might be used in the formulation of its DeclContext (for
563 // example, a function parameter can be used in decltype() in trailing
564 // return type of the function). Use the translation unit DeclContext as a
565 // placeholder.
566 GlobalDeclID SemaDCIDForTemplateParmDecl = readDeclID();
567 GlobalDeclID LexicalDCIDForTemplateParmDecl = readDeclID();
568 if (!LexicalDCIDForTemplateParmDecl)
569 LexicalDCIDForTemplateParmDecl = SemaDCIDForTemplateParmDecl;
570 Reader.addPendingDeclContextInfo(D,
571 SemaDCIDForTemplateParmDecl,
572 LexicalDCIDForTemplateParmDecl);
573 D->setDeclContext(Reader.getContext().getTranslationUnitDecl());
574 } else {
575 auto *SemaDC = readDeclAs<DeclContext>();
576 auto *LexicalDC = readDeclAs<DeclContext>();
577 if (!LexicalDC)
578 LexicalDC = SemaDC;
579 DeclContext *MergedSemaDC = Reader.MergedDeclContexts.lookup(SemaDC);
580 // Avoid calling setLexicalDeclContext() directly because it uses
581 // Decl::getASTContext() internally which is unsafe during derialization.
582 D->setDeclContextsImpl(MergedSemaDC ? MergedSemaDC : SemaDC, LexicalDC,
583 Reader.getContext());
584 }
585 D->setLocation(ThisDeclLoc);
586 D->setInvalidDecl(Record.readInt());
587 if (Record.readInt()) { // hasAttrs
588 AttrVec Attrs;
589 Record.readAttributes(Attrs);
590 // Avoid calling setAttrs() directly because it uses Decl::getASTContext()
591 // internally which is unsafe during derialization.
592 D->setAttrsImpl(Attrs, Reader.getContext());
593 }
594 D->setImplicit(Record.readInt());
595 D->Used = Record.readInt();
596 IsDeclMarkedUsed |= D->Used;
597 D->setReferenced(Record.readInt());
598 D->setTopLevelDeclInObjCContainer(Record.readInt());
599 D->setAccess((AccessSpecifier)Record.readInt());
600 D->FromASTFile = true;
601 bool ModulePrivate = Record.readInt();
602
603 // Determine whether this declaration is part of a (sub)module. If so, it
604 // may not yet be visible.
605 if (unsigned SubmoduleID = readSubmoduleID()) {
606 // Store the owning submodule ID in the declaration.
607 D->setModuleOwnershipKind(
608 ModulePrivate ? Decl::ModuleOwnershipKind::ModulePrivate
609 : Decl::ModuleOwnershipKind::VisibleWhenImported);
610 D->setOwningModuleID(SubmoduleID);
611
612 if (ModulePrivate) {
613 // Module-private declarations are never visible, so there is no work to
614 // do.
615 } else if (Reader.getContext().getLangOpts().ModulesLocalVisibility) {
616 // If local visibility is being tracked, this declaration will become
617 // hidden and visible as the owning module does.
618 } else if (Module *Owner = Reader.getSubmodule(SubmoduleID)) {
619 // Mark the declaration as visible when its owning module becomes visible.
620 if (Owner->NameVisibility == Module::AllVisible)
621 D->setVisibleDespiteOwningModule();
622 else
623 Reader.HiddenNamesMap[Owner].push_back(D);
624 }
625 } else if (ModulePrivate) {
626 D->setModuleOwnershipKind(Decl::ModuleOwnershipKind::ModulePrivate);
627 }
628 }
629
VisitPragmaCommentDecl(PragmaCommentDecl * D)630 void ASTDeclReader::VisitPragmaCommentDecl(PragmaCommentDecl *D) {
631 VisitDecl(D);
632 D->setLocation(readSourceLocation());
633 D->CommentKind = (PragmaMSCommentKind)Record.readInt();
634 std::string Arg = readString();
635 memcpy(D->getTrailingObjects<char>(), Arg.data(), Arg.size());
636 D->getTrailingObjects<char>()[Arg.size()] = '\0';
637 }
638
VisitPragmaDetectMismatchDecl(PragmaDetectMismatchDecl * D)639 void ASTDeclReader::VisitPragmaDetectMismatchDecl(PragmaDetectMismatchDecl *D) {
640 VisitDecl(D);
641 D->setLocation(readSourceLocation());
642 std::string Name = readString();
643 memcpy(D->getTrailingObjects<char>(), Name.data(), Name.size());
644 D->getTrailingObjects<char>()[Name.size()] = '\0';
645
646 D->ValueStart = Name.size() + 1;
647 std::string Value = readString();
648 memcpy(D->getTrailingObjects<char>() + D->ValueStart, Value.data(),
649 Value.size());
650 D->getTrailingObjects<char>()[D->ValueStart + Value.size()] = '\0';
651 }
652
VisitTranslationUnitDecl(TranslationUnitDecl * TU)653 void ASTDeclReader::VisitTranslationUnitDecl(TranslationUnitDecl *TU) {
654 llvm_unreachable("Translation units are not serialized");
655 }
656
VisitNamedDecl(NamedDecl * ND)657 void ASTDeclReader::VisitNamedDecl(NamedDecl *ND) {
658 VisitDecl(ND);
659 ND->setDeclName(Record.readDeclarationName());
660 AnonymousDeclNumber = Record.readInt();
661 }
662
VisitTypeDecl(TypeDecl * TD)663 void ASTDeclReader::VisitTypeDecl(TypeDecl *TD) {
664 VisitNamedDecl(TD);
665 TD->setLocStart(readSourceLocation());
666 // Delay type reading until after we have fully initialized the decl.
667 DeferredTypeID = Record.getGlobalTypeID(Record.readInt());
668 }
669
670 ASTDeclReader::RedeclarableResult
VisitTypedefNameDecl(TypedefNameDecl * TD)671 ASTDeclReader::VisitTypedefNameDecl(TypedefNameDecl *TD) {
672 RedeclarableResult Redecl = VisitRedeclarable(TD);
673 VisitTypeDecl(TD);
674 TypeSourceInfo *TInfo = readTypeSourceInfo();
675 if (Record.readInt()) { // isModed
676 QualType modedT = Record.readType();
677 TD->setModedTypeSourceInfo(TInfo, modedT);
678 } else
679 TD->setTypeSourceInfo(TInfo);
680 // Read and discard the declaration for which this is a typedef name for
681 // linkage, if it exists. We cannot rely on our type to pull in this decl,
682 // because it might have been merged with a type from another module and
683 // thus might not refer to our version of the declaration.
684 readDecl();
685 return Redecl;
686 }
687
VisitTypedefDecl(TypedefDecl * TD)688 void ASTDeclReader::VisitTypedefDecl(TypedefDecl *TD) {
689 RedeclarableResult Redecl = VisitTypedefNameDecl(TD);
690 mergeRedeclarable(TD, Redecl);
691 }
692
VisitTypeAliasDecl(TypeAliasDecl * TD)693 void ASTDeclReader::VisitTypeAliasDecl(TypeAliasDecl *TD) {
694 RedeclarableResult Redecl = VisitTypedefNameDecl(TD);
695 if (auto *Template = readDeclAs<TypeAliasTemplateDecl>())
696 // Merged when we merge the template.
697 TD->setDescribedAliasTemplate(Template);
698 else
699 mergeRedeclarable(TD, Redecl);
700 }
701
VisitTagDecl(TagDecl * TD)702 ASTDeclReader::RedeclarableResult ASTDeclReader::VisitTagDecl(TagDecl *TD) {
703 RedeclarableResult Redecl = VisitRedeclarable(TD);
704 VisitTypeDecl(TD);
705
706 TD->IdentifierNamespace = Record.readInt();
707 TD->setTagKind((TagDecl::TagKind)Record.readInt());
708 if (!isa<CXXRecordDecl>(TD))
709 TD->setCompleteDefinition(Record.readInt());
710 TD->setEmbeddedInDeclarator(Record.readInt());
711 TD->setFreeStanding(Record.readInt());
712 TD->setCompleteDefinitionRequired(Record.readInt());
713 TD->setBraceRange(readSourceRange());
714
715 switch (Record.readInt()) {
716 case 0:
717 break;
718 case 1: { // ExtInfo
719 auto *Info = new (Reader.getContext()) TagDecl::ExtInfo();
720 Record.readQualifierInfo(*Info);
721 TD->TypedefNameDeclOrQualifier = Info;
722 break;
723 }
724 case 2: // TypedefNameForAnonDecl
725 NamedDeclForTagDecl = readDeclID();
726 TypedefNameForLinkage = Record.readIdentifier();
727 break;
728 default:
729 llvm_unreachable("unexpected tag info kind");
730 }
731
732 if (!isa<CXXRecordDecl>(TD))
733 mergeRedeclarable(TD, Redecl);
734 return Redecl;
735 }
736
VisitEnumDecl(EnumDecl * ED)737 void ASTDeclReader::VisitEnumDecl(EnumDecl *ED) {
738 VisitTagDecl(ED);
739 if (TypeSourceInfo *TI = readTypeSourceInfo())
740 ED->setIntegerTypeSourceInfo(TI);
741 else
742 ED->setIntegerType(Record.readType());
743 ED->setPromotionType(Record.readType());
744 ED->setNumPositiveBits(Record.readInt());
745 ED->setNumNegativeBits(Record.readInt());
746 ED->setScoped(Record.readInt());
747 ED->setScopedUsingClassTag(Record.readInt());
748 ED->setFixed(Record.readInt());
749
750 ED->setHasODRHash(true);
751 ED->ODRHash = Record.readInt();
752
753 // If this is a definition subject to the ODR, and we already have a
754 // definition, merge this one into it.
755 if (ED->isCompleteDefinition() &&
756 Reader.getContext().getLangOpts().Modules &&
757 Reader.getContext().getLangOpts().CPlusPlus) {
758 EnumDecl *&OldDef = Reader.EnumDefinitions[ED->getCanonicalDecl()];
759 if (!OldDef) {
760 // This is the first time we've seen an imported definition. Look for a
761 // local definition before deciding that we are the first definition.
762 for (auto *D : merged_redecls(ED->getCanonicalDecl())) {
763 if (!D->isFromASTFile() && D->isCompleteDefinition()) {
764 OldDef = D;
765 break;
766 }
767 }
768 }
769 if (OldDef) {
770 Reader.MergedDeclContexts.insert(std::make_pair(ED, OldDef));
771 ED->setCompleteDefinition(false);
772 Reader.mergeDefinitionVisibility(OldDef, ED);
773 if (OldDef->getODRHash() != ED->getODRHash())
774 Reader.PendingEnumOdrMergeFailures[OldDef].push_back(ED);
775 } else {
776 OldDef = ED;
777 }
778 }
779
780 if (auto *InstED = readDeclAs<EnumDecl>()) {
781 auto TSK = (TemplateSpecializationKind)Record.readInt();
782 SourceLocation POI = readSourceLocation();
783 ED->setInstantiationOfMemberEnum(Reader.getContext(), InstED, TSK);
784 ED->getMemberSpecializationInfo()->setPointOfInstantiation(POI);
785 }
786 }
787
788 ASTDeclReader::RedeclarableResult
VisitRecordDeclImpl(RecordDecl * RD)789 ASTDeclReader::VisitRecordDeclImpl(RecordDecl *RD) {
790 RedeclarableResult Redecl = VisitTagDecl(RD);
791 RD->setHasFlexibleArrayMember(Record.readInt());
792 RD->setAnonymousStructOrUnion(Record.readInt());
793 RD->setHasObjectMember(Record.readInt());
794 RD->setHasVolatileMember(Record.readInt());
795 RD->setNonTrivialToPrimitiveDefaultInitialize(Record.readInt());
796 RD->setNonTrivialToPrimitiveCopy(Record.readInt());
797 RD->setNonTrivialToPrimitiveDestroy(Record.readInt());
798 RD->setHasNonTrivialToPrimitiveDefaultInitializeCUnion(Record.readInt());
799 RD->setHasNonTrivialToPrimitiveDestructCUnion(Record.readInt());
800 RD->setHasNonTrivialToPrimitiveCopyCUnion(Record.readInt());
801 RD->setParamDestroyedInCallee(Record.readInt());
802 RD->setArgPassingRestrictions((RecordDecl::ArgPassingKind)Record.readInt());
803 return Redecl;
804 }
805
VisitValueDecl(ValueDecl * VD)806 void ASTDeclReader::VisitValueDecl(ValueDecl *VD) {
807 VisitNamedDecl(VD);
808 // For function declarations, defer reading the type in case the function has
809 // a deduced return type that references an entity declared within the
810 // function.
811 if (isa<FunctionDecl>(VD))
812 DeferredTypeID = Record.getGlobalTypeID(Record.readInt());
813 else
814 VD->setType(Record.readType());
815 }
816
VisitEnumConstantDecl(EnumConstantDecl * ECD)817 void ASTDeclReader::VisitEnumConstantDecl(EnumConstantDecl *ECD) {
818 VisitValueDecl(ECD);
819 if (Record.readInt())
820 ECD->setInitExpr(Record.readExpr());
821 ECD->setInitVal(Record.readAPSInt());
822 mergeMergeable(ECD);
823 }
824
VisitDeclaratorDecl(DeclaratorDecl * DD)825 void ASTDeclReader::VisitDeclaratorDecl(DeclaratorDecl *DD) {
826 VisitValueDecl(DD);
827 DD->setInnerLocStart(readSourceLocation());
828 if (Record.readInt()) { // hasExtInfo
829 auto *Info = new (Reader.getContext()) DeclaratorDecl::ExtInfo();
830 Record.readQualifierInfo(*Info);
831 Info->TrailingRequiresClause = Record.readExpr();
832 DD->DeclInfo = Info;
833 }
834 QualType TSIType = Record.readType();
835 DD->setTypeSourceInfo(
836 TSIType.isNull() ? nullptr
837 : Reader.getContext().CreateTypeSourceInfo(TSIType));
838 }
839
VisitFunctionDecl(FunctionDecl * FD)840 void ASTDeclReader::VisitFunctionDecl(FunctionDecl *FD) {
841 RedeclarableResult Redecl = VisitRedeclarable(FD);
842 VisitDeclaratorDecl(FD);
843
844 // Attach a type to this function. Use the real type if possible, but fall
845 // back to the type as written if it involves a deduced return type.
846 if (FD->getTypeSourceInfo() &&
847 FD->getTypeSourceInfo()->getType()->castAs<FunctionType>()
848 ->getReturnType()->getContainedAutoType()) {
849 // We'll set up the real type in Visit, once we've finished loading the
850 // function.
851 FD->setType(FD->getTypeSourceInfo()->getType());
852 Reader.PendingFunctionTypes.push_back({FD, DeferredTypeID});
853 } else {
854 FD->setType(Reader.GetType(DeferredTypeID));
855 }
856 DeferredTypeID = 0;
857
858 FD->DNLoc = Record.readDeclarationNameLoc(FD->getDeclName());
859 FD->IdentifierNamespace = Record.readInt();
860
861 // FunctionDecl's body is handled last at ASTDeclReader::Visit,
862 // after everything else is read.
863
864 FD->setStorageClass(static_cast<StorageClass>(Record.readInt()));
865 FD->setInlineSpecified(Record.readInt());
866 FD->setImplicitlyInline(Record.readInt());
867 FD->setVirtualAsWritten(Record.readInt());
868 FD->setPure(Record.readInt());
869 FD->setHasInheritedPrototype(Record.readInt());
870 FD->setHasWrittenPrototype(Record.readInt());
871 FD->setDeletedAsWritten(Record.readInt());
872 FD->setTrivial(Record.readInt());
873 FD->setTrivialForCall(Record.readInt());
874 FD->setDefaulted(Record.readInt());
875 FD->setExplicitlyDefaulted(Record.readInt());
876 FD->setHasImplicitReturnZero(Record.readInt());
877 FD->setConstexprKind(static_cast<ConstexprSpecKind>(Record.readInt()));
878 FD->setUsesSEHTry(Record.readInt());
879 FD->setHasSkippedBody(Record.readInt());
880 FD->setIsMultiVersion(Record.readInt());
881 FD->setLateTemplateParsed(Record.readInt());
882
883 FD->setCachedLinkage(static_cast<Linkage>(Record.readInt()));
884 FD->EndRangeLoc = readSourceLocation();
885
886 FD->ODRHash = Record.readInt();
887 FD->setHasODRHash(true);
888 FD->setUsesFPIntrin(Record.readInt());
889
890 if (FD->isDefaulted()) {
891 if (unsigned NumLookups = Record.readInt()) {
892 SmallVector<DeclAccessPair, 8> Lookups;
893 for (unsigned I = 0; I != NumLookups; ++I) {
894 NamedDecl *ND = Record.readDeclAs<NamedDecl>();
895 AccessSpecifier AS = (AccessSpecifier)Record.readInt();
896 Lookups.push_back(DeclAccessPair::make(ND, AS));
897 }
898 FD->setDefaultedFunctionInfo(FunctionDecl::DefaultedFunctionInfo::Create(
899 Reader.getContext(), Lookups));
900 }
901 }
902
903 switch ((FunctionDecl::TemplatedKind)Record.readInt()) {
904 case FunctionDecl::TK_NonTemplate:
905 mergeRedeclarable(FD, Redecl);
906 break;
907 case FunctionDecl::TK_FunctionTemplate:
908 // Merged when we merge the template.
909 FD->setDescribedFunctionTemplate(readDeclAs<FunctionTemplateDecl>());
910 break;
911 case FunctionDecl::TK_MemberSpecialization: {
912 auto *InstFD = readDeclAs<FunctionDecl>();
913 auto TSK = (TemplateSpecializationKind)Record.readInt();
914 SourceLocation POI = readSourceLocation();
915 FD->setInstantiationOfMemberFunction(Reader.getContext(), InstFD, TSK);
916 FD->getMemberSpecializationInfo()->setPointOfInstantiation(POI);
917 mergeRedeclarable(FD, Redecl);
918 break;
919 }
920 case FunctionDecl::TK_FunctionTemplateSpecialization: {
921 auto *Template = readDeclAs<FunctionTemplateDecl>();
922 auto TSK = (TemplateSpecializationKind)Record.readInt();
923
924 // Template arguments.
925 SmallVector<TemplateArgument, 8> TemplArgs;
926 Record.readTemplateArgumentList(TemplArgs, /*Canonicalize*/ true);
927
928 // Template args as written.
929 SmallVector<TemplateArgumentLoc, 8> TemplArgLocs;
930 SourceLocation LAngleLoc, RAngleLoc;
931 bool HasTemplateArgumentsAsWritten = Record.readInt();
932 if (HasTemplateArgumentsAsWritten) {
933 unsigned NumTemplateArgLocs = Record.readInt();
934 TemplArgLocs.reserve(NumTemplateArgLocs);
935 for (unsigned i = 0; i != NumTemplateArgLocs; ++i)
936 TemplArgLocs.push_back(Record.readTemplateArgumentLoc());
937
938 LAngleLoc = readSourceLocation();
939 RAngleLoc = readSourceLocation();
940 }
941
942 SourceLocation POI = readSourceLocation();
943
944 ASTContext &C = Reader.getContext();
945 TemplateArgumentList *TemplArgList
946 = TemplateArgumentList::CreateCopy(C, TemplArgs);
947 TemplateArgumentListInfo TemplArgsInfo(LAngleLoc, RAngleLoc);
948 for (unsigned i = 0, e = TemplArgLocs.size(); i != e; ++i)
949 TemplArgsInfo.addArgument(TemplArgLocs[i]);
950
951 MemberSpecializationInfo *MSInfo = nullptr;
952 if (Record.readInt()) {
953 auto *FD = readDeclAs<FunctionDecl>();
954 auto TSK = (TemplateSpecializationKind)Record.readInt();
955 SourceLocation POI = readSourceLocation();
956
957 MSInfo = new (C) MemberSpecializationInfo(FD, TSK);
958 MSInfo->setPointOfInstantiation(POI);
959 }
960
961 FunctionTemplateSpecializationInfo *FTInfo =
962 FunctionTemplateSpecializationInfo::Create(
963 C, FD, Template, TSK, TemplArgList,
964 HasTemplateArgumentsAsWritten ? &TemplArgsInfo : nullptr, POI,
965 MSInfo);
966 FD->TemplateOrSpecialization = FTInfo;
967
968 if (FD->isCanonicalDecl()) { // if canonical add to template's set.
969 // The template that contains the specializations set. It's not safe to
970 // use getCanonicalDecl on Template since it may still be initializing.
971 auto *CanonTemplate = readDeclAs<FunctionTemplateDecl>();
972 // Get the InsertPos by FindNodeOrInsertPos() instead of calling
973 // InsertNode(FTInfo) directly to avoid the getASTContext() call in
974 // FunctionTemplateSpecializationInfo's Profile().
975 // We avoid getASTContext because a decl in the parent hierarchy may
976 // be initializing.
977 llvm::FoldingSetNodeID ID;
978 FunctionTemplateSpecializationInfo::Profile(ID, TemplArgs, C);
979 void *InsertPos = nullptr;
980 FunctionTemplateDecl::Common *CommonPtr = CanonTemplate->getCommonPtr();
981 FunctionTemplateSpecializationInfo *ExistingInfo =
982 CommonPtr->Specializations.FindNodeOrInsertPos(ID, InsertPos);
983 if (InsertPos)
984 CommonPtr->Specializations.InsertNode(FTInfo, InsertPos);
985 else {
986 assert(Reader.getContext().getLangOpts().Modules &&
987 "already deserialized this template specialization");
988 mergeRedeclarable(FD, ExistingInfo->getFunction(), Redecl);
989 }
990 }
991 break;
992 }
993 case FunctionDecl::TK_DependentFunctionTemplateSpecialization: {
994 // Templates.
995 UnresolvedSet<8> TemplDecls;
996 unsigned NumTemplates = Record.readInt();
997 while (NumTemplates--)
998 TemplDecls.addDecl(readDeclAs<NamedDecl>());
999
1000 // Templates args.
1001 TemplateArgumentListInfo TemplArgs;
1002 unsigned NumArgs = Record.readInt();
1003 while (NumArgs--)
1004 TemplArgs.addArgument(Record.readTemplateArgumentLoc());
1005 TemplArgs.setLAngleLoc(readSourceLocation());
1006 TemplArgs.setRAngleLoc(readSourceLocation());
1007
1008 FD->setDependentTemplateSpecialization(Reader.getContext(),
1009 TemplDecls, TemplArgs);
1010 // These are not merged; we don't need to merge redeclarations of dependent
1011 // template friends.
1012 break;
1013 }
1014 }
1015
1016 // Read in the parameters.
1017 unsigned NumParams = Record.readInt();
1018 SmallVector<ParmVarDecl *, 16> Params;
1019 Params.reserve(NumParams);
1020 for (unsigned I = 0; I != NumParams; ++I)
1021 Params.push_back(readDeclAs<ParmVarDecl>());
1022 FD->setParams(Reader.getContext(), Params);
1023 }
1024
VisitObjCMethodDecl(ObjCMethodDecl * MD)1025 void ASTDeclReader::VisitObjCMethodDecl(ObjCMethodDecl *MD) {
1026 VisitNamedDecl(MD);
1027 if (Record.readInt()) {
1028 // Load the body on-demand. Most clients won't care, because method
1029 // definitions rarely show up in headers.
1030 Reader.PendingBodies[MD] = GetCurrentCursorOffset();
1031 HasPendingBody = true;
1032 }
1033 MD->setSelfDecl(readDeclAs<ImplicitParamDecl>());
1034 MD->setCmdDecl(readDeclAs<ImplicitParamDecl>());
1035 MD->setInstanceMethod(Record.readInt());
1036 MD->setVariadic(Record.readInt());
1037 MD->setPropertyAccessor(Record.readInt());
1038 MD->setSynthesizedAccessorStub(Record.readInt());
1039 MD->setDefined(Record.readInt());
1040 MD->setOverriding(Record.readInt());
1041 MD->setHasSkippedBody(Record.readInt());
1042
1043 MD->setIsRedeclaration(Record.readInt());
1044 MD->setHasRedeclaration(Record.readInt());
1045 if (MD->hasRedeclaration())
1046 Reader.getContext().setObjCMethodRedeclaration(MD,
1047 readDeclAs<ObjCMethodDecl>());
1048
1049 MD->setDeclImplementation((ObjCMethodDecl::ImplementationControl)Record.readInt());
1050 MD->setObjCDeclQualifier((Decl::ObjCDeclQualifier)Record.readInt());
1051 MD->setRelatedResultType(Record.readInt());
1052 MD->setReturnType(Record.readType());
1053 MD->setReturnTypeSourceInfo(readTypeSourceInfo());
1054 MD->DeclEndLoc = readSourceLocation();
1055 unsigned NumParams = Record.readInt();
1056 SmallVector<ParmVarDecl *, 16> Params;
1057 Params.reserve(NumParams);
1058 for (unsigned I = 0; I != NumParams; ++I)
1059 Params.push_back(readDeclAs<ParmVarDecl>());
1060
1061 MD->setSelLocsKind((SelectorLocationsKind)Record.readInt());
1062 unsigned NumStoredSelLocs = Record.readInt();
1063 SmallVector<SourceLocation, 16> SelLocs;
1064 SelLocs.reserve(NumStoredSelLocs);
1065 for (unsigned i = 0; i != NumStoredSelLocs; ++i)
1066 SelLocs.push_back(readSourceLocation());
1067
1068 MD->setParamsAndSelLocs(Reader.getContext(), Params, SelLocs);
1069 }
1070
VisitObjCTypeParamDecl(ObjCTypeParamDecl * D)1071 void ASTDeclReader::VisitObjCTypeParamDecl(ObjCTypeParamDecl *D) {
1072 VisitTypedefNameDecl(D);
1073
1074 D->Variance = Record.readInt();
1075 D->Index = Record.readInt();
1076 D->VarianceLoc = readSourceLocation();
1077 D->ColonLoc = readSourceLocation();
1078 }
1079
VisitObjCContainerDecl(ObjCContainerDecl * CD)1080 void ASTDeclReader::VisitObjCContainerDecl(ObjCContainerDecl *CD) {
1081 VisitNamedDecl(CD);
1082 CD->setAtStartLoc(readSourceLocation());
1083 CD->setAtEndRange(readSourceRange());
1084 }
1085
ReadObjCTypeParamList()1086 ObjCTypeParamList *ASTDeclReader::ReadObjCTypeParamList() {
1087 unsigned numParams = Record.readInt();
1088 if (numParams == 0)
1089 return nullptr;
1090
1091 SmallVector<ObjCTypeParamDecl *, 4> typeParams;
1092 typeParams.reserve(numParams);
1093 for (unsigned i = 0; i != numParams; ++i) {
1094 auto *typeParam = readDeclAs<ObjCTypeParamDecl>();
1095 if (!typeParam)
1096 return nullptr;
1097
1098 typeParams.push_back(typeParam);
1099 }
1100
1101 SourceLocation lAngleLoc = readSourceLocation();
1102 SourceLocation rAngleLoc = readSourceLocation();
1103
1104 return ObjCTypeParamList::create(Reader.getContext(), lAngleLoc,
1105 typeParams, rAngleLoc);
1106 }
1107
ReadObjCDefinitionData(struct ObjCInterfaceDecl::DefinitionData & Data)1108 void ASTDeclReader::ReadObjCDefinitionData(
1109 struct ObjCInterfaceDecl::DefinitionData &Data) {
1110 // Read the superclass.
1111 Data.SuperClassTInfo = readTypeSourceInfo();
1112
1113 Data.EndLoc = readSourceLocation();
1114 Data.HasDesignatedInitializers = Record.readInt();
1115
1116 // Read the directly referenced protocols and their SourceLocations.
1117 unsigned NumProtocols = Record.readInt();
1118 SmallVector<ObjCProtocolDecl *, 16> Protocols;
1119 Protocols.reserve(NumProtocols);
1120 for (unsigned I = 0; I != NumProtocols; ++I)
1121 Protocols.push_back(readDeclAs<ObjCProtocolDecl>());
1122 SmallVector<SourceLocation, 16> ProtoLocs;
1123 ProtoLocs.reserve(NumProtocols);
1124 for (unsigned I = 0; I != NumProtocols; ++I)
1125 ProtoLocs.push_back(readSourceLocation());
1126 Data.ReferencedProtocols.set(Protocols.data(), NumProtocols, ProtoLocs.data(),
1127 Reader.getContext());
1128
1129 // Read the transitive closure of protocols referenced by this class.
1130 NumProtocols = Record.readInt();
1131 Protocols.clear();
1132 Protocols.reserve(NumProtocols);
1133 for (unsigned I = 0; I != NumProtocols; ++I)
1134 Protocols.push_back(readDeclAs<ObjCProtocolDecl>());
1135 Data.AllReferencedProtocols.set(Protocols.data(), NumProtocols,
1136 Reader.getContext());
1137 }
1138
MergeDefinitionData(ObjCInterfaceDecl * D,struct ObjCInterfaceDecl::DefinitionData && NewDD)1139 void ASTDeclReader::MergeDefinitionData(ObjCInterfaceDecl *D,
1140 struct ObjCInterfaceDecl::DefinitionData &&NewDD) {
1141 // FIXME: odr checking?
1142 }
1143
VisitObjCInterfaceDecl(ObjCInterfaceDecl * ID)1144 void ASTDeclReader::VisitObjCInterfaceDecl(ObjCInterfaceDecl *ID) {
1145 RedeclarableResult Redecl = VisitRedeclarable(ID);
1146 VisitObjCContainerDecl(ID);
1147 DeferredTypeID = Record.getGlobalTypeID(Record.readInt());
1148 mergeRedeclarable(ID, Redecl);
1149
1150 ID->TypeParamList = ReadObjCTypeParamList();
1151 if (Record.readInt()) {
1152 // Read the definition.
1153 ID->allocateDefinitionData();
1154
1155 ReadObjCDefinitionData(ID->data());
1156 ObjCInterfaceDecl *Canon = ID->getCanonicalDecl();
1157 if (Canon->Data.getPointer()) {
1158 // If we already have a definition, keep the definition invariant and
1159 // merge the data.
1160 MergeDefinitionData(Canon, std::move(ID->data()));
1161 ID->Data = Canon->Data;
1162 } else {
1163 // Set the definition data of the canonical declaration, so other
1164 // redeclarations will see it.
1165 ID->getCanonicalDecl()->Data = ID->Data;
1166
1167 // We will rebuild this list lazily.
1168 ID->setIvarList(nullptr);
1169 }
1170
1171 // Note that we have deserialized a definition.
1172 Reader.PendingDefinitions.insert(ID);
1173
1174 // Note that we've loaded this Objective-C class.
1175 Reader.ObjCClassesLoaded.push_back(ID);
1176 } else {
1177 ID->Data = ID->getCanonicalDecl()->Data;
1178 }
1179 }
1180
VisitObjCIvarDecl(ObjCIvarDecl * IVD)1181 void ASTDeclReader::VisitObjCIvarDecl(ObjCIvarDecl *IVD) {
1182 VisitFieldDecl(IVD);
1183 IVD->setAccessControl((ObjCIvarDecl::AccessControl)Record.readInt());
1184 // This field will be built lazily.
1185 IVD->setNextIvar(nullptr);
1186 bool synth = Record.readInt();
1187 IVD->setSynthesize(synth);
1188 }
1189
ReadObjCDefinitionData(struct ObjCProtocolDecl::DefinitionData & Data)1190 void ASTDeclReader::ReadObjCDefinitionData(
1191 struct ObjCProtocolDecl::DefinitionData &Data) {
1192 unsigned NumProtoRefs = Record.readInt();
1193 SmallVector<ObjCProtocolDecl *, 16> ProtoRefs;
1194 ProtoRefs.reserve(NumProtoRefs);
1195 for (unsigned I = 0; I != NumProtoRefs; ++I)
1196 ProtoRefs.push_back(readDeclAs<ObjCProtocolDecl>());
1197 SmallVector<SourceLocation, 16> ProtoLocs;
1198 ProtoLocs.reserve(NumProtoRefs);
1199 for (unsigned I = 0; I != NumProtoRefs; ++I)
1200 ProtoLocs.push_back(readSourceLocation());
1201 Data.ReferencedProtocols.set(ProtoRefs.data(), NumProtoRefs,
1202 ProtoLocs.data(), Reader.getContext());
1203 }
1204
MergeDefinitionData(ObjCProtocolDecl * D,struct ObjCProtocolDecl::DefinitionData && NewDD)1205 void ASTDeclReader::MergeDefinitionData(ObjCProtocolDecl *D,
1206 struct ObjCProtocolDecl::DefinitionData &&NewDD) {
1207 // FIXME: odr checking?
1208 }
1209
VisitObjCProtocolDecl(ObjCProtocolDecl * PD)1210 void ASTDeclReader::VisitObjCProtocolDecl(ObjCProtocolDecl *PD) {
1211 RedeclarableResult Redecl = VisitRedeclarable(PD);
1212 VisitObjCContainerDecl(PD);
1213 mergeRedeclarable(PD, Redecl);
1214
1215 if (Record.readInt()) {
1216 // Read the definition.
1217 PD->allocateDefinitionData();
1218
1219 ReadObjCDefinitionData(PD->data());
1220
1221 ObjCProtocolDecl *Canon = PD->getCanonicalDecl();
1222 if (Canon->Data.getPointer()) {
1223 // If we already have a definition, keep the definition invariant and
1224 // merge the data.
1225 MergeDefinitionData(Canon, std::move(PD->data()));
1226 PD->Data = Canon->Data;
1227 } else {
1228 // Set the definition data of the canonical declaration, so other
1229 // redeclarations will see it.
1230 PD->getCanonicalDecl()->Data = PD->Data;
1231 }
1232 // Note that we have deserialized a definition.
1233 Reader.PendingDefinitions.insert(PD);
1234 } else {
1235 PD->Data = PD->getCanonicalDecl()->Data;
1236 }
1237 }
1238
VisitObjCAtDefsFieldDecl(ObjCAtDefsFieldDecl * FD)1239 void ASTDeclReader::VisitObjCAtDefsFieldDecl(ObjCAtDefsFieldDecl *FD) {
1240 VisitFieldDecl(FD);
1241 }
1242
VisitObjCCategoryDecl(ObjCCategoryDecl * CD)1243 void ASTDeclReader::VisitObjCCategoryDecl(ObjCCategoryDecl *CD) {
1244 VisitObjCContainerDecl(CD);
1245 CD->setCategoryNameLoc(readSourceLocation());
1246 CD->setIvarLBraceLoc(readSourceLocation());
1247 CD->setIvarRBraceLoc(readSourceLocation());
1248
1249 // Note that this category has been deserialized. We do this before
1250 // deserializing the interface declaration, so that it will consider this
1251 /// category.
1252 Reader.CategoriesDeserialized.insert(CD);
1253
1254 CD->ClassInterface = readDeclAs<ObjCInterfaceDecl>();
1255 CD->TypeParamList = ReadObjCTypeParamList();
1256 unsigned NumProtoRefs = Record.readInt();
1257 SmallVector<ObjCProtocolDecl *, 16> ProtoRefs;
1258 ProtoRefs.reserve(NumProtoRefs);
1259 for (unsigned I = 0; I != NumProtoRefs; ++I)
1260 ProtoRefs.push_back(readDeclAs<ObjCProtocolDecl>());
1261 SmallVector<SourceLocation, 16> ProtoLocs;
1262 ProtoLocs.reserve(NumProtoRefs);
1263 for (unsigned I = 0; I != NumProtoRefs; ++I)
1264 ProtoLocs.push_back(readSourceLocation());
1265 CD->setProtocolList(ProtoRefs.data(), NumProtoRefs, ProtoLocs.data(),
1266 Reader.getContext());
1267
1268 // Protocols in the class extension belong to the class.
1269 if (NumProtoRefs > 0 && CD->ClassInterface && CD->IsClassExtension())
1270 CD->ClassInterface->mergeClassExtensionProtocolList(
1271 (ObjCProtocolDecl *const *)ProtoRefs.data(), NumProtoRefs,
1272 Reader.getContext());
1273 }
1274
VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl * CAD)1275 void ASTDeclReader::VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *CAD) {
1276 VisitNamedDecl(CAD);
1277 CAD->setClassInterface(readDeclAs<ObjCInterfaceDecl>());
1278 }
1279
VisitObjCPropertyDecl(ObjCPropertyDecl * D)1280 void ASTDeclReader::VisitObjCPropertyDecl(ObjCPropertyDecl *D) {
1281 VisitNamedDecl(D);
1282 D->setAtLoc(readSourceLocation());
1283 D->setLParenLoc(readSourceLocation());
1284 QualType T = Record.readType();
1285 TypeSourceInfo *TSI = readTypeSourceInfo();
1286 D->setType(T, TSI);
1287 D->setPropertyAttributes((ObjCPropertyAttribute::Kind)Record.readInt());
1288 D->setPropertyAttributesAsWritten(
1289 (ObjCPropertyAttribute::Kind)Record.readInt());
1290 D->setPropertyImplementation(
1291 (ObjCPropertyDecl::PropertyControl)Record.readInt());
1292 DeclarationName GetterName = Record.readDeclarationName();
1293 SourceLocation GetterLoc = readSourceLocation();
1294 D->setGetterName(GetterName.getObjCSelector(), GetterLoc);
1295 DeclarationName SetterName = Record.readDeclarationName();
1296 SourceLocation SetterLoc = readSourceLocation();
1297 D->setSetterName(SetterName.getObjCSelector(), SetterLoc);
1298 D->setGetterMethodDecl(readDeclAs<ObjCMethodDecl>());
1299 D->setSetterMethodDecl(readDeclAs<ObjCMethodDecl>());
1300 D->setPropertyIvarDecl(readDeclAs<ObjCIvarDecl>());
1301 }
1302
VisitObjCImplDecl(ObjCImplDecl * D)1303 void ASTDeclReader::VisitObjCImplDecl(ObjCImplDecl *D) {
1304 VisitObjCContainerDecl(D);
1305 D->setClassInterface(readDeclAs<ObjCInterfaceDecl>());
1306 }
1307
VisitObjCCategoryImplDecl(ObjCCategoryImplDecl * D)1308 void ASTDeclReader::VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *D) {
1309 VisitObjCImplDecl(D);
1310 D->CategoryNameLoc = readSourceLocation();
1311 }
1312
VisitObjCImplementationDecl(ObjCImplementationDecl * D)1313 void ASTDeclReader::VisitObjCImplementationDecl(ObjCImplementationDecl *D) {
1314 VisitObjCImplDecl(D);
1315 D->setSuperClass(readDeclAs<ObjCInterfaceDecl>());
1316 D->SuperLoc = readSourceLocation();
1317 D->setIvarLBraceLoc(readSourceLocation());
1318 D->setIvarRBraceLoc(readSourceLocation());
1319 D->setHasNonZeroConstructors(Record.readInt());
1320 D->setHasDestructors(Record.readInt());
1321 D->NumIvarInitializers = Record.readInt();
1322 if (D->NumIvarInitializers)
1323 D->IvarInitializers = ReadGlobalOffset();
1324 }
1325
VisitObjCPropertyImplDecl(ObjCPropertyImplDecl * D)1326 void ASTDeclReader::VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *D) {
1327 VisitDecl(D);
1328 D->setAtLoc(readSourceLocation());
1329 D->setPropertyDecl(readDeclAs<ObjCPropertyDecl>());
1330 D->PropertyIvarDecl = readDeclAs<ObjCIvarDecl>();
1331 D->IvarLoc = readSourceLocation();
1332 D->setGetterMethodDecl(readDeclAs<ObjCMethodDecl>());
1333 D->setSetterMethodDecl(readDeclAs<ObjCMethodDecl>());
1334 D->setGetterCXXConstructor(Record.readExpr());
1335 D->setSetterCXXAssignment(Record.readExpr());
1336 }
1337
VisitFieldDecl(FieldDecl * FD)1338 void ASTDeclReader::VisitFieldDecl(FieldDecl *FD) {
1339 VisitDeclaratorDecl(FD);
1340 FD->Mutable = Record.readInt();
1341
1342 if (auto ISK = static_cast<FieldDecl::InitStorageKind>(Record.readInt())) {
1343 FD->InitStorage.setInt(ISK);
1344 FD->InitStorage.setPointer(ISK == FieldDecl::ISK_CapturedVLAType
1345 ? Record.readType().getAsOpaquePtr()
1346 : Record.readExpr());
1347 }
1348
1349 if (auto *BW = Record.readExpr())
1350 FD->setBitWidth(BW);
1351
1352 if (!FD->getDeclName()) {
1353 if (auto *Tmpl = readDeclAs<FieldDecl>())
1354 Reader.getContext().setInstantiatedFromUnnamedFieldDecl(FD, Tmpl);
1355 }
1356 mergeMergeable(FD);
1357 }
1358
VisitMSPropertyDecl(MSPropertyDecl * PD)1359 void ASTDeclReader::VisitMSPropertyDecl(MSPropertyDecl *PD) {
1360 VisitDeclaratorDecl(PD);
1361 PD->GetterId = Record.readIdentifier();
1362 PD->SetterId = Record.readIdentifier();
1363 }
1364
VisitMSGuidDecl(MSGuidDecl * D)1365 void ASTDeclReader::VisitMSGuidDecl(MSGuidDecl *D) {
1366 VisitValueDecl(D);
1367 D->PartVal.Part1 = Record.readInt();
1368 D->PartVal.Part2 = Record.readInt();
1369 D->PartVal.Part3 = Record.readInt();
1370 for (auto &C : D->PartVal.Part4And5)
1371 C = Record.readInt();
1372
1373 // Add this GUID to the AST context's lookup structure, and merge if needed.
1374 if (MSGuidDecl *Existing = Reader.getContext().MSGuidDecls.GetOrInsertNode(D))
1375 Reader.getContext().setPrimaryMergedDecl(D, Existing->getCanonicalDecl());
1376 }
1377
VisitIndirectFieldDecl(IndirectFieldDecl * FD)1378 void ASTDeclReader::VisitIndirectFieldDecl(IndirectFieldDecl *FD) {
1379 VisitValueDecl(FD);
1380
1381 FD->ChainingSize = Record.readInt();
1382 assert(FD->ChainingSize >= 2 && "Anonymous chaining must be >= 2");
1383 FD->Chaining = new (Reader.getContext())NamedDecl*[FD->ChainingSize];
1384
1385 for (unsigned I = 0; I != FD->ChainingSize; ++I)
1386 FD->Chaining[I] = readDeclAs<NamedDecl>();
1387
1388 mergeMergeable(FD);
1389 }
1390
VisitVarDeclImpl(VarDecl * VD)1391 ASTDeclReader::RedeclarableResult ASTDeclReader::VisitVarDeclImpl(VarDecl *VD) {
1392 RedeclarableResult Redecl = VisitRedeclarable(VD);
1393 VisitDeclaratorDecl(VD);
1394
1395 VD->VarDeclBits.SClass = (StorageClass)Record.readInt();
1396 VD->VarDeclBits.TSCSpec = Record.readInt();
1397 VD->VarDeclBits.InitStyle = Record.readInt();
1398 VD->VarDeclBits.ARCPseudoStrong = Record.readInt();
1399 if (!isa<ParmVarDecl>(VD)) {
1400 VD->NonParmVarDeclBits.IsThisDeclarationADemotedDefinition =
1401 Record.readInt();
1402 VD->NonParmVarDeclBits.ExceptionVar = Record.readInt();
1403 VD->NonParmVarDeclBits.NRVOVariable = Record.readInt();
1404 VD->NonParmVarDeclBits.CXXForRangeDecl = Record.readInt();
1405 VD->NonParmVarDeclBits.ObjCForDecl = Record.readInt();
1406 VD->NonParmVarDeclBits.IsInline = Record.readInt();
1407 VD->NonParmVarDeclBits.IsInlineSpecified = Record.readInt();
1408 VD->NonParmVarDeclBits.IsConstexpr = Record.readInt();
1409 VD->NonParmVarDeclBits.IsInitCapture = Record.readInt();
1410 VD->NonParmVarDeclBits.PreviousDeclInSameBlockScope = Record.readInt();
1411 VD->NonParmVarDeclBits.ImplicitParamKind = Record.readInt();
1412 VD->NonParmVarDeclBits.EscapingByref = Record.readInt();
1413 }
1414 auto VarLinkage = Linkage(Record.readInt());
1415 VD->setCachedLinkage(VarLinkage);
1416
1417 // Reconstruct the one piece of the IdentifierNamespace that we need.
1418 if (VD->getStorageClass() == SC_Extern && VarLinkage != NoLinkage &&
1419 VD->getLexicalDeclContext()->isFunctionOrMethod())
1420 VD->setLocalExternDecl();
1421
1422 if (uint64_t Val = Record.readInt()) {
1423 VD->setInit(Record.readExpr());
1424 if (Val > 1) {
1425 EvaluatedStmt *Eval = VD->ensureEvaluatedStmt();
1426 Eval->CheckedICE = true;
1427 Eval->IsICE = (Val & 1) != 0;
1428 Eval->HasConstantDestruction = (Val & 4) != 0;
1429 }
1430 }
1431
1432 if (VD->hasAttr<BlocksAttr>() && VD->getType()->getAsCXXRecordDecl()) {
1433 Expr *CopyExpr = Record.readExpr();
1434 if (CopyExpr)
1435 Reader.getContext().setBlockVarCopyInit(VD, CopyExpr, Record.readInt());
1436 }
1437
1438 if (VD->getStorageDuration() == SD_Static && Record.readInt()) {
1439 Reader.DefinitionSource[VD] = Loc.F->Kind == ModuleKind::MK_MainFile;
1440 if (Reader.getContext().getLangOpts().BuildingPCHWithObjectFile &&
1441 Reader.DeclIsFromPCHWithObjectFile(VD))
1442 Reader.DefinitionSource[VD] = true;
1443 }
1444
1445 enum VarKind {
1446 VarNotTemplate = 0, VarTemplate, StaticDataMemberSpecialization
1447 };
1448 switch ((VarKind)Record.readInt()) {
1449 case VarNotTemplate:
1450 // Only true variables (not parameters or implicit parameters) can be
1451 // merged; the other kinds are not really redeclarable at all.
1452 if (!isa<ParmVarDecl>(VD) && !isa<ImplicitParamDecl>(VD) &&
1453 !isa<VarTemplateSpecializationDecl>(VD))
1454 mergeRedeclarable(VD, Redecl);
1455 break;
1456 case VarTemplate:
1457 // Merged when we merge the template.
1458 VD->setDescribedVarTemplate(readDeclAs<VarTemplateDecl>());
1459 break;
1460 case StaticDataMemberSpecialization: { // HasMemberSpecializationInfo.
1461 auto *Tmpl = readDeclAs<VarDecl>();
1462 auto TSK = (TemplateSpecializationKind)Record.readInt();
1463 SourceLocation POI = readSourceLocation();
1464 Reader.getContext().setInstantiatedFromStaticDataMember(VD, Tmpl, TSK,POI);
1465 mergeRedeclarable(VD, Redecl);
1466 break;
1467 }
1468 }
1469
1470 return Redecl;
1471 }
1472
VisitImplicitParamDecl(ImplicitParamDecl * PD)1473 void ASTDeclReader::VisitImplicitParamDecl(ImplicitParamDecl *PD) {
1474 VisitVarDecl(PD);
1475 }
1476
VisitParmVarDecl(ParmVarDecl * PD)1477 void ASTDeclReader::VisitParmVarDecl(ParmVarDecl *PD) {
1478 VisitVarDecl(PD);
1479 unsigned isObjCMethodParam = Record.readInt();
1480 unsigned scopeDepth = Record.readInt();
1481 unsigned scopeIndex = Record.readInt();
1482 unsigned declQualifier = Record.readInt();
1483 if (isObjCMethodParam) {
1484 assert(scopeDepth == 0);
1485 PD->setObjCMethodScopeInfo(scopeIndex);
1486 PD->ParmVarDeclBits.ScopeDepthOrObjCQuals = declQualifier;
1487 } else {
1488 PD->setScopeInfo(scopeDepth, scopeIndex);
1489 }
1490 PD->ParmVarDeclBits.IsKNRPromoted = Record.readInt();
1491 PD->ParmVarDeclBits.HasInheritedDefaultArg = Record.readInt();
1492 if (Record.readInt()) // hasUninstantiatedDefaultArg.
1493 PD->setUninstantiatedDefaultArg(Record.readExpr());
1494
1495 // FIXME: If this is a redeclaration of a function from another module, handle
1496 // inheritance of default arguments.
1497 }
1498
VisitDecompositionDecl(DecompositionDecl * DD)1499 void ASTDeclReader::VisitDecompositionDecl(DecompositionDecl *DD) {
1500 VisitVarDecl(DD);
1501 auto **BDs = DD->getTrailingObjects<BindingDecl *>();
1502 for (unsigned I = 0; I != DD->NumBindings; ++I) {
1503 BDs[I] = readDeclAs<BindingDecl>();
1504 BDs[I]->setDecomposedDecl(DD);
1505 }
1506 }
1507
VisitBindingDecl(BindingDecl * BD)1508 void ASTDeclReader::VisitBindingDecl(BindingDecl *BD) {
1509 VisitValueDecl(BD);
1510 BD->Binding = Record.readExpr();
1511 }
1512
VisitFileScopeAsmDecl(FileScopeAsmDecl * AD)1513 void ASTDeclReader::VisitFileScopeAsmDecl(FileScopeAsmDecl *AD) {
1514 VisitDecl(AD);
1515 AD->setAsmString(cast<StringLiteral>(Record.readExpr()));
1516 AD->setRParenLoc(readSourceLocation());
1517 }
1518
VisitBlockDecl(BlockDecl * BD)1519 void ASTDeclReader::VisitBlockDecl(BlockDecl *BD) {
1520 VisitDecl(BD);
1521 BD->setBody(cast_or_null<CompoundStmt>(Record.readStmt()));
1522 BD->setSignatureAsWritten(readTypeSourceInfo());
1523 unsigned NumParams = Record.readInt();
1524 SmallVector<ParmVarDecl *, 16> Params;
1525 Params.reserve(NumParams);
1526 for (unsigned I = 0; I != NumParams; ++I)
1527 Params.push_back(readDeclAs<ParmVarDecl>());
1528 BD->setParams(Params);
1529
1530 BD->setIsVariadic(Record.readInt());
1531 BD->setBlockMissingReturnType(Record.readInt());
1532 BD->setIsConversionFromLambda(Record.readInt());
1533 BD->setDoesNotEscape(Record.readInt());
1534 BD->setCanAvoidCopyToHeap(Record.readInt());
1535
1536 bool capturesCXXThis = Record.readInt();
1537 unsigned numCaptures = Record.readInt();
1538 SmallVector<BlockDecl::Capture, 16> captures;
1539 captures.reserve(numCaptures);
1540 for (unsigned i = 0; i != numCaptures; ++i) {
1541 auto *decl = readDeclAs<VarDecl>();
1542 unsigned flags = Record.readInt();
1543 bool byRef = (flags & 1);
1544 bool nested = (flags & 2);
1545 Expr *copyExpr = ((flags & 4) ? Record.readExpr() : nullptr);
1546
1547 captures.push_back(BlockDecl::Capture(decl, byRef, nested, copyExpr));
1548 }
1549 BD->setCaptures(Reader.getContext(), captures, capturesCXXThis);
1550 }
1551
VisitCapturedDecl(CapturedDecl * CD)1552 void ASTDeclReader::VisitCapturedDecl(CapturedDecl *CD) {
1553 VisitDecl(CD);
1554 unsigned ContextParamPos = Record.readInt();
1555 CD->setNothrow(Record.readInt() != 0);
1556 // Body is set by VisitCapturedStmt.
1557 for (unsigned I = 0; I < CD->NumParams; ++I) {
1558 if (I != ContextParamPos)
1559 CD->setParam(I, readDeclAs<ImplicitParamDecl>());
1560 else
1561 CD->setContextParam(I, readDeclAs<ImplicitParamDecl>());
1562 }
1563 }
1564
VisitLinkageSpecDecl(LinkageSpecDecl * D)1565 void ASTDeclReader::VisitLinkageSpecDecl(LinkageSpecDecl *D) {
1566 VisitDecl(D);
1567 D->setLanguage((LinkageSpecDecl::LanguageIDs)Record.readInt());
1568 D->setExternLoc(readSourceLocation());
1569 D->setRBraceLoc(readSourceLocation());
1570 }
1571
VisitExportDecl(ExportDecl * D)1572 void ASTDeclReader::VisitExportDecl(ExportDecl *D) {
1573 VisitDecl(D);
1574 D->RBraceLoc = readSourceLocation();
1575 }
1576
VisitLabelDecl(LabelDecl * D)1577 void ASTDeclReader::VisitLabelDecl(LabelDecl *D) {
1578 VisitNamedDecl(D);
1579 D->setLocStart(readSourceLocation());
1580 }
1581
VisitNamespaceDecl(NamespaceDecl * D)1582 void ASTDeclReader::VisitNamespaceDecl(NamespaceDecl *D) {
1583 RedeclarableResult Redecl = VisitRedeclarable(D);
1584 VisitNamedDecl(D);
1585 D->setInline(Record.readInt());
1586 D->LocStart = readSourceLocation();
1587 D->RBraceLoc = readSourceLocation();
1588
1589 // Defer loading the anonymous namespace until we've finished merging
1590 // this namespace; loading it might load a later declaration of the
1591 // same namespace, and we have an invariant that older declarations
1592 // get merged before newer ones try to merge.
1593 GlobalDeclID AnonNamespace = 0;
1594 if (Redecl.getFirstID() == ThisDeclID) {
1595 AnonNamespace = readDeclID();
1596 } else {
1597 // Link this namespace back to the first declaration, which has already
1598 // been deserialized.
1599 D->AnonOrFirstNamespaceAndInline.setPointer(D->getFirstDecl());
1600 }
1601
1602 mergeRedeclarable(D, Redecl);
1603
1604 if (AnonNamespace) {
1605 // Each module has its own anonymous namespace, which is disjoint from
1606 // any other module's anonymous namespaces, so don't attach the anonymous
1607 // namespace at all.
1608 auto *Anon = cast<NamespaceDecl>(Reader.GetDecl(AnonNamespace));
1609 if (!Record.isModule())
1610 D->setAnonymousNamespace(Anon);
1611 }
1612 }
1613
VisitNamespaceAliasDecl(NamespaceAliasDecl * D)1614 void ASTDeclReader::VisitNamespaceAliasDecl(NamespaceAliasDecl *D) {
1615 RedeclarableResult Redecl = VisitRedeclarable(D);
1616 VisitNamedDecl(D);
1617 D->NamespaceLoc = readSourceLocation();
1618 D->IdentLoc = readSourceLocation();
1619 D->QualifierLoc = Record.readNestedNameSpecifierLoc();
1620 D->Namespace = readDeclAs<NamedDecl>();
1621 mergeRedeclarable(D, Redecl);
1622 }
1623
VisitUsingDecl(UsingDecl * D)1624 void ASTDeclReader::VisitUsingDecl(UsingDecl *D) {
1625 VisitNamedDecl(D);
1626 D->setUsingLoc(readSourceLocation());
1627 D->QualifierLoc = Record.readNestedNameSpecifierLoc();
1628 D->DNLoc = Record.readDeclarationNameLoc(D->getDeclName());
1629 D->FirstUsingShadow.setPointer(readDeclAs<UsingShadowDecl>());
1630 D->setTypename(Record.readInt());
1631 if (auto *Pattern = readDeclAs<NamedDecl>())
1632 Reader.getContext().setInstantiatedFromUsingDecl(D, Pattern);
1633 mergeMergeable(D);
1634 }
1635
VisitUsingPackDecl(UsingPackDecl * D)1636 void ASTDeclReader::VisitUsingPackDecl(UsingPackDecl *D) {
1637 VisitNamedDecl(D);
1638 D->InstantiatedFrom = readDeclAs<NamedDecl>();
1639 auto **Expansions = D->getTrailingObjects<NamedDecl *>();
1640 for (unsigned I = 0; I != D->NumExpansions; ++I)
1641 Expansions[I] = readDeclAs<NamedDecl>();
1642 mergeMergeable(D);
1643 }
1644
VisitUsingShadowDecl(UsingShadowDecl * D)1645 void ASTDeclReader::VisitUsingShadowDecl(UsingShadowDecl *D) {
1646 RedeclarableResult Redecl = VisitRedeclarable(D);
1647 VisitNamedDecl(D);
1648 D->Underlying = readDeclAs<NamedDecl>();
1649 D->IdentifierNamespace = Record.readInt();
1650 D->UsingOrNextShadow = readDeclAs<NamedDecl>();
1651 auto *Pattern = readDeclAs<UsingShadowDecl>();
1652 if (Pattern)
1653 Reader.getContext().setInstantiatedFromUsingShadowDecl(D, Pattern);
1654 mergeRedeclarable(D, Redecl);
1655 }
1656
VisitConstructorUsingShadowDecl(ConstructorUsingShadowDecl * D)1657 void ASTDeclReader::VisitConstructorUsingShadowDecl(
1658 ConstructorUsingShadowDecl *D) {
1659 VisitUsingShadowDecl(D);
1660 D->NominatedBaseClassShadowDecl = readDeclAs<ConstructorUsingShadowDecl>();
1661 D->ConstructedBaseClassShadowDecl = readDeclAs<ConstructorUsingShadowDecl>();
1662 D->IsVirtual = Record.readInt();
1663 }
1664
VisitUsingDirectiveDecl(UsingDirectiveDecl * D)1665 void ASTDeclReader::VisitUsingDirectiveDecl(UsingDirectiveDecl *D) {
1666 VisitNamedDecl(D);
1667 D->UsingLoc = readSourceLocation();
1668 D->NamespaceLoc = readSourceLocation();
1669 D->QualifierLoc = Record.readNestedNameSpecifierLoc();
1670 D->NominatedNamespace = readDeclAs<NamedDecl>();
1671 D->CommonAncestor = readDeclAs<DeclContext>();
1672 }
1673
VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl * D)1674 void ASTDeclReader::VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D) {
1675 VisitValueDecl(D);
1676 D->setUsingLoc(readSourceLocation());
1677 D->QualifierLoc = Record.readNestedNameSpecifierLoc();
1678 D->DNLoc = Record.readDeclarationNameLoc(D->getDeclName());
1679 D->EllipsisLoc = readSourceLocation();
1680 mergeMergeable(D);
1681 }
1682
VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl * D)1683 void ASTDeclReader::VisitUnresolvedUsingTypenameDecl(
1684 UnresolvedUsingTypenameDecl *D) {
1685 VisitTypeDecl(D);
1686 D->TypenameLocation = readSourceLocation();
1687 D->QualifierLoc = Record.readNestedNameSpecifierLoc();
1688 D->EllipsisLoc = readSourceLocation();
1689 mergeMergeable(D);
1690 }
1691
ReadCXXDefinitionData(struct CXXRecordDecl::DefinitionData & Data,const CXXRecordDecl * D)1692 void ASTDeclReader::ReadCXXDefinitionData(
1693 struct CXXRecordDecl::DefinitionData &Data, const CXXRecordDecl *D) {
1694 #define FIELD(Name, Width, Merge) \
1695 Data.Name = Record.readInt();
1696 #include "clang/AST/CXXRecordDeclDefinitionBits.def"
1697
1698 // Note: the caller has deserialized the IsLambda bit already.
1699 Data.ODRHash = Record.readInt();
1700 Data.HasODRHash = true;
1701
1702 if (Record.readInt()) {
1703 Reader.DefinitionSource[D] = Loc.F->Kind == ModuleKind::MK_MainFile;
1704 if (Reader.getContext().getLangOpts().BuildingPCHWithObjectFile &&
1705 Reader.DeclIsFromPCHWithObjectFile(D))
1706 Reader.DefinitionSource[D] = true;
1707 }
1708
1709 Data.NumBases = Record.readInt();
1710 if (Data.NumBases)
1711 Data.Bases = ReadGlobalOffset();
1712 Data.NumVBases = Record.readInt();
1713 if (Data.NumVBases)
1714 Data.VBases = ReadGlobalOffset();
1715
1716 Record.readUnresolvedSet(Data.Conversions);
1717 Data.ComputedVisibleConversions = Record.readInt();
1718 if (Data.ComputedVisibleConversions)
1719 Record.readUnresolvedSet(Data.VisibleConversions);
1720 assert(Data.Definition && "Data.Definition should be already set!");
1721 Data.FirstFriend = readDeclID();
1722
1723 if (Data.IsLambda) {
1724 using Capture = LambdaCapture;
1725
1726 auto &Lambda = static_cast<CXXRecordDecl::LambdaDefinitionData &>(Data);
1727 Lambda.Dependent = Record.readInt();
1728 Lambda.IsGenericLambda = Record.readInt();
1729 Lambda.CaptureDefault = Record.readInt();
1730 Lambda.NumCaptures = Record.readInt();
1731 Lambda.NumExplicitCaptures = Record.readInt();
1732 Lambda.HasKnownInternalLinkage = Record.readInt();
1733 Lambda.ManglingNumber = Record.readInt();
1734 Lambda.ContextDecl = readDeclID();
1735 Lambda.Captures = (Capture *)Reader.getContext().Allocate(
1736 sizeof(Capture) * Lambda.NumCaptures);
1737 Capture *ToCapture = Lambda.Captures;
1738 Lambda.MethodTyInfo = readTypeSourceInfo();
1739 for (unsigned I = 0, N = Lambda.NumCaptures; I != N; ++I) {
1740 SourceLocation Loc = readSourceLocation();
1741 bool IsImplicit = Record.readInt();
1742 auto Kind = static_cast<LambdaCaptureKind>(Record.readInt());
1743 switch (Kind) {
1744 case LCK_StarThis:
1745 case LCK_This:
1746 case LCK_VLAType:
1747 *ToCapture++ = Capture(Loc, IsImplicit, Kind, nullptr,SourceLocation());
1748 break;
1749 case LCK_ByCopy:
1750 case LCK_ByRef:
1751 auto *Var = readDeclAs<VarDecl>();
1752 SourceLocation EllipsisLoc = readSourceLocation();
1753 *ToCapture++ = Capture(Loc, IsImplicit, Kind, Var, EllipsisLoc);
1754 break;
1755 }
1756 }
1757 }
1758 }
1759
MergeDefinitionData(CXXRecordDecl * D,struct CXXRecordDecl::DefinitionData && MergeDD)1760 void ASTDeclReader::MergeDefinitionData(
1761 CXXRecordDecl *D, struct CXXRecordDecl::DefinitionData &&MergeDD) {
1762 assert(D->DefinitionData &&
1763 "merging class definition into non-definition");
1764 auto &DD = *D->DefinitionData;
1765
1766 if (DD.Definition != MergeDD.Definition) {
1767 // Track that we merged the definitions.
1768 Reader.MergedDeclContexts.insert(std::make_pair(MergeDD.Definition,
1769 DD.Definition));
1770 Reader.PendingDefinitions.erase(MergeDD.Definition);
1771 MergeDD.Definition->setCompleteDefinition(false);
1772 Reader.mergeDefinitionVisibility(DD.Definition, MergeDD.Definition);
1773 assert(Reader.Lookups.find(MergeDD.Definition) == Reader.Lookups.end() &&
1774 "already loaded pending lookups for merged definition");
1775 }
1776
1777 auto PFDI = Reader.PendingFakeDefinitionData.find(&DD);
1778 if (PFDI != Reader.PendingFakeDefinitionData.end() &&
1779 PFDI->second == ASTReader::PendingFakeDefinitionKind::Fake) {
1780 // We faked up this definition data because we found a class for which we'd
1781 // not yet loaded the definition. Replace it with the real thing now.
1782 assert(!DD.IsLambda && !MergeDD.IsLambda && "faked up lambda definition?");
1783 PFDI->second = ASTReader::PendingFakeDefinitionKind::FakeLoaded;
1784
1785 // Don't change which declaration is the definition; that is required
1786 // to be invariant once we select it.
1787 auto *Def = DD.Definition;
1788 DD = std::move(MergeDD);
1789 DD.Definition = Def;
1790 return;
1791 }
1792
1793 bool DetectedOdrViolation = false;
1794
1795 #define FIELD(Name, Width, Merge) Merge(Name)
1796 #define MERGE_OR(Field) DD.Field |= MergeDD.Field;
1797 #define NO_MERGE(Field) \
1798 DetectedOdrViolation |= DD.Field != MergeDD.Field; \
1799 MERGE_OR(Field)
1800 #include "clang/AST/CXXRecordDeclDefinitionBits.def"
1801 NO_MERGE(IsLambda)
1802 #undef NO_MERGE
1803 #undef MERGE_OR
1804
1805 if (DD.NumBases != MergeDD.NumBases || DD.NumVBases != MergeDD.NumVBases)
1806 DetectedOdrViolation = true;
1807 // FIXME: Issue a diagnostic if the base classes don't match when we come
1808 // to lazily load them.
1809
1810 // FIXME: Issue a diagnostic if the list of conversion functions doesn't
1811 // match when we come to lazily load them.
1812 if (MergeDD.ComputedVisibleConversions && !DD.ComputedVisibleConversions) {
1813 DD.VisibleConversions = std::move(MergeDD.VisibleConversions);
1814 DD.ComputedVisibleConversions = true;
1815 }
1816
1817 // FIXME: Issue a diagnostic if FirstFriend doesn't match when we come to
1818 // lazily load it.
1819
1820 if (DD.IsLambda) {
1821 // FIXME: ODR-checking for merging lambdas (this happens, for instance,
1822 // when they occur within the body of a function template specialization).
1823 }
1824
1825 if (D->getODRHash() != MergeDD.ODRHash) {
1826 DetectedOdrViolation = true;
1827 }
1828
1829 if (DetectedOdrViolation)
1830 Reader.PendingOdrMergeFailures[DD.Definition].push_back(
1831 {MergeDD.Definition, &MergeDD});
1832 }
1833
ReadCXXRecordDefinition(CXXRecordDecl * D,bool Update)1834 void ASTDeclReader::ReadCXXRecordDefinition(CXXRecordDecl *D, bool Update) {
1835 struct CXXRecordDecl::DefinitionData *DD;
1836 ASTContext &C = Reader.getContext();
1837
1838 // Determine whether this is a lambda closure type, so that we can
1839 // allocate the appropriate DefinitionData structure.
1840 bool IsLambda = Record.readInt();
1841 if (IsLambda)
1842 DD = new (C) CXXRecordDecl::LambdaDefinitionData(D, nullptr, false, false,
1843 LCD_None);
1844 else
1845 DD = new (C) struct CXXRecordDecl::DefinitionData(D);
1846
1847 CXXRecordDecl *Canon = D->getCanonicalDecl();
1848 // Set decl definition data before reading it, so that during deserialization
1849 // when we read CXXRecordDecl, it already has definition data and we don't
1850 // set fake one.
1851 if (!Canon->DefinitionData)
1852 Canon->DefinitionData = DD;
1853 D->DefinitionData = Canon->DefinitionData;
1854 ReadCXXDefinitionData(*DD, D);
1855
1856 // We might already have a different definition for this record. This can
1857 // happen either because we're reading an update record, or because we've
1858 // already done some merging. Either way, just merge into it.
1859 if (Canon->DefinitionData != DD) {
1860 MergeDefinitionData(Canon, std::move(*DD));
1861 return;
1862 }
1863
1864 // Mark this declaration as being a definition.
1865 D->setCompleteDefinition(true);
1866
1867 // If this is not the first declaration or is an update record, we can have
1868 // other redeclarations already. Make a note that we need to propagate the
1869 // DefinitionData pointer onto them.
1870 if (Update || Canon != D)
1871 Reader.PendingDefinitions.insert(D);
1872 }
1873
1874 ASTDeclReader::RedeclarableResult
VisitCXXRecordDeclImpl(CXXRecordDecl * D)1875 ASTDeclReader::VisitCXXRecordDeclImpl(CXXRecordDecl *D) {
1876 RedeclarableResult Redecl = VisitRecordDeclImpl(D);
1877
1878 ASTContext &C = Reader.getContext();
1879
1880 enum CXXRecKind {
1881 CXXRecNotTemplate = 0, CXXRecTemplate, CXXRecMemberSpecialization
1882 };
1883 switch ((CXXRecKind)Record.readInt()) {
1884 case CXXRecNotTemplate:
1885 // Merged when we merge the folding set entry in the primary template.
1886 if (!isa<ClassTemplateSpecializationDecl>(D))
1887 mergeRedeclarable(D, Redecl);
1888 break;
1889 case CXXRecTemplate: {
1890 // Merged when we merge the template.
1891 auto *Template = readDeclAs<ClassTemplateDecl>();
1892 D->TemplateOrInstantiation = Template;
1893 if (!Template->getTemplatedDecl()) {
1894 // We've not actually loaded the ClassTemplateDecl yet, because we're
1895 // currently being loaded as its pattern. Rely on it to set up our
1896 // TypeForDecl (see VisitClassTemplateDecl).
1897 //
1898 // Beware: we do not yet know our canonical declaration, and may still
1899 // get merged once the surrounding class template has got off the ground.
1900 DeferredTypeID = 0;
1901 }
1902 break;
1903 }
1904 case CXXRecMemberSpecialization: {
1905 auto *RD = readDeclAs<CXXRecordDecl>();
1906 auto TSK = (TemplateSpecializationKind)Record.readInt();
1907 SourceLocation POI = readSourceLocation();
1908 MemberSpecializationInfo *MSI = new (C) MemberSpecializationInfo(RD, TSK);
1909 MSI->setPointOfInstantiation(POI);
1910 D->TemplateOrInstantiation = MSI;
1911 mergeRedeclarable(D, Redecl);
1912 break;
1913 }
1914 }
1915
1916 bool WasDefinition = Record.readInt();
1917 if (WasDefinition)
1918 ReadCXXRecordDefinition(D, /*Update*/false);
1919 else
1920 // Propagate DefinitionData pointer from the canonical declaration.
1921 D->DefinitionData = D->getCanonicalDecl()->DefinitionData;
1922
1923 // Lazily load the key function to avoid deserializing every method so we can
1924 // compute it.
1925 if (WasDefinition) {
1926 DeclID KeyFn = readDeclID();
1927 if (KeyFn && D->isCompleteDefinition())
1928 // FIXME: This is wrong for the ARM ABI, where some other module may have
1929 // made this function no longer be a key function. We need an update
1930 // record or similar for that case.
1931 C.KeyFunctions[D] = KeyFn;
1932 }
1933
1934 return Redecl;
1935 }
1936
VisitCXXDeductionGuideDecl(CXXDeductionGuideDecl * D)1937 void ASTDeclReader::VisitCXXDeductionGuideDecl(CXXDeductionGuideDecl *D) {
1938 D->setExplicitSpecifier(Record.readExplicitSpec());
1939 VisitFunctionDecl(D);
1940 D->setIsCopyDeductionCandidate(Record.readInt());
1941 }
1942
VisitCXXMethodDecl(CXXMethodDecl * D)1943 void ASTDeclReader::VisitCXXMethodDecl(CXXMethodDecl *D) {
1944 VisitFunctionDecl(D);
1945
1946 unsigned NumOverridenMethods = Record.readInt();
1947 if (D->isCanonicalDecl()) {
1948 while (NumOverridenMethods--) {
1949 // Avoid invariant checking of CXXMethodDecl::addOverriddenMethod,
1950 // MD may be initializing.
1951 if (auto *MD = readDeclAs<CXXMethodDecl>())
1952 Reader.getContext().addOverriddenMethod(D, MD->getCanonicalDecl());
1953 }
1954 } else {
1955 // We don't care about which declarations this used to override; we get
1956 // the relevant information from the canonical declaration.
1957 Record.skipInts(NumOverridenMethods);
1958 }
1959 }
1960
VisitCXXConstructorDecl(CXXConstructorDecl * D)1961 void ASTDeclReader::VisitCXXConstructorDecl(CXXConstructorDecl *D) {
1962 // We need the inherited constructor information to merge the declaration,
1963 // so we have to read it before we call VisitCXXMethodDecl.
1964 D->setExplicitSpecifier(Record.readExplicitSpec());
1965 if (D->isInheritingConstructor()) {
1966 auto *Shadow = readDeclAs<ConstructorUsingShadowDecl>();
1967 auto *Ctor = readDeclAs<CXXConstructorDecl>();
1968 *D->getTrailingObjects<InheritedConstructor>() =
1969 InheritedConstructor(Shadow, Ctor);
1970 }
1971
1972 VisitCXXMethodDecl(D);
1973 }
1974
VisitCXXDestructorDecl(CXXDestructorDecl * D)1975 void ASTDeclReader::VisitCXXDestructorDecl(CXXDestructorDecl *D) {
1976 VisitCXXMethodDecl(D);
1977
1978 if (auto *OperatorDelete = readDeclAs<FunctionDecl>()) {
1979 CXXDestructorDecl *Canon = D->getCanonicalDecl();
1980 auto *ThisArg = Record.readExpr();
1981 // FIXME: Check consistency if we have an old and new operator delete.
1982 if (!Canon->OperatorDelete) {
1983 Canon->OperatorDelete = OperatorDelete;
1984 Canon->OperatorDeleteThisArg = ThisArg;
1985 }
1986 }
1987 }
1988
VisitCXXConversionDecl(CXXConversionDecl * D)1989 void ASTDeclReader::VisitCXXConversionDecl(CXXConversionDecl *D) {
1990 D->setExplicitSpecifier(Record.readExplicitSpec());
1991 VisitCXXMethodDecl(D);
1992 }
1993
VisitImportDecl(ImportDecl * D)1994 void ASTDeclReader::VisitImportDecl(ImportDecl *D) {
1995 VisitDecl(D);
1996 D->ImportedModule = readModule();
1997 D->setImportComplete(Record.readInt());
1998 auto *StoredLocs = D->getTrailingObjects<SourceLocation>();
1999 for (unsigned I = 0, N = Record.back(); I != N; ++I)
2000 StoredLocs[I] = readSourceLocation();
2001 Record.skipInts(1); // The number of stored source locations.
2002 }
2003
VisitAccessSpecDecl(AccessSpecDecl * D)2004 void ASTDeclReader::VisitAccessSpecDecl(AccessSpecDecl *D) {
2005 VisitDecl(D);
2006 D->setColonLoc(readSourceLocation());
2007 }
2008
VisitFriendDecl(FriendDecl * D)2009 void ASTDeclReader::VisitFriendDecl(FriendDecl *D) {
2010 VisitDecl(D);
2011 if (Record.readInt()) // hasFriendDecl
2012 D->Friend = readDeclAs<NamedDecl>();
2013 else
2014 D->Friend = readTypeSourceInfo();
2015 for (unsigned i = 0; i != D->NumTPLists; ++i)
2016 D->getTrailingObjects<TemplateParameterList *>()[i] =
2017 Record.readTemplateParameterList();
2018 D->NextFriend = readDeclID();
2019 D->UnsupportedFriend = (Record.readInt() != 0);
2020 D->FriendLoc = readSourceLocation();
2021 }
2022
VisitFriendTemplateDecl(FriendTemplateDecl * D)2023 void ASTDeclReader::VisitFriendTemplateDecl(FriendTemplateDecl *D) {
2024 VisitDecl(D);
2025 unsigned NumParams = Record.readInt();
2026 D->NumParams = NumParams;
2027 D->Params = new TemplateParameterList*[NumParams];
2028 for (unsigned i = 0; i != NumParams; ++i)
2029 D->Params[i] = Record.readTemplateParameterList();
2030 if (Record.readInt()) // HasFriendDecl
2031 D->Friend = readDeclAs<NamedDecl>();
2032 else
2033 D->Friend = readTypeSourceInfo();
2034 D->FriendLoc = readSourceLocation();
2035 }
2036
VisitTemplateDecl(TemplateDecl * D)2037 DeclID ASTDeclReader::VisitTemplateDecl(TemplateDecl *D) {
2038 VisitNamedDecl(D);
2039
2040 DeclID PatternID = readDeclID();
2041 auto *TemplatedDecl = cast_or_null<NamedDecl>(Reader.GetDecl(PatternID));
2042 TemplateParameterList *TemplateParams = Record.readTemplateParameterList();
2043 D->init(TemplatedDecl, TemplateParams);
2044
2045 return PatternID;
2046 }
2047
VisitConceptDecl(ConceptDecl * D)2048 void ASTDeclReader::VisitConceptDecl(ConceptDecl *D) {
2049 VisitTemplateDecl(D);
2050 D->ConstraintExpr = Record.readExpr();
2051 mergeMergeable(D);
2052 }
2053
VisitRequiresExprBodyDecl(RequiresExprBodyDecl * D)2054 void ASTDeclReader::VisitRequiresExprBodyDecl(RequiresExprBodyDecl *D) {
2055 }
2056
2057 ASTDeclReader::RedeclarableResult
VisitRedeclarableTemplateDecl(RedeclarableTemplateDecl * D)2058 ASTDeclReader::VisitRedeclarableTemplateDecl(RedeclarableTemplateDecl *D) {
2059 RedeclarableResult Redecl = VisitRedeclarable(D);
2060
2061 // Make sure we've allocated the Common pointer first. We do this before
2062 // VisitTemplateDecl so that getCommonPtr() can be used during initialization.
2063 RedeclarableTemplateDecl *CanonD = D->getCanonicalDecl();
2064 if (!CanonD->Common) {
2065 CanonD->Common = CanonD->newCommon(Reader.getContext());
2066 Reader.PendingDefinitions.insert(CanonD);
2067 }
2068 D->Common = CanonD->Common;
2069
2070 // If this is the first declaration of the template, fill in the information
2071 // for the 'common' pointer.
2072 if (ThisDeclID == Redecl.getFirstID()) {
2073 if (auto *RTD = readDeclAs<RedeclarableTemplateDecl>()) {
2074 assert(RTD->getKind() == D->getKind() &&
2075 "InstantiatedFromMemberTemplate kind mismatch");
2076 D->setInstantiatedFromMemberTemplate(RTD);
2077 if (Record.readInt())
2078 D->setMemberSpecialization();
2079 }
2080 }
2081
2082 DeclID PatternID = VisitTemplateDecl(D);
2083 D->IdentifierNamespace = Record.readInt();
2084
2085 mergeRedeclarable(D, Redecl, PatternID);
2086
2087 // If we merged the template with a prior declaration chain, merge the common
2088 // pointer.
2089 // FIXME: Actually merge here, don't just overwrite.
2090 D->Common = D->getCanonicalDecl()->Common;
2091
2092 return Redecl;
2093 }
2094
VisitClassTemplateDecl(ClassTemplateDecl * D)2095 void ASTDeclReader::VisitClassTemplateDecl(ClassTemplateDecl *D) {
2096 RedeclarableResult Redecl = VisitRedeclarableTemplateDecl(D);
2097
2098 if (ThisDeclID == Redecl.getFirstID()) {
2099 // This ClassTemplateDecl owns a CommonPtr; read it to keep track of all of
2100 // the specializations.
2101 SmallVector<serialization::DeclID, 32> SpecIDs;
2102 readDeclIDList(SpecIDs);
2103 ASTDeclReader::AddLazySpecializations(D, SpecIDs);
2104 }
2105
2106 if (D->getTemplatedDecl()->TemplateOrInstantiation) {
2107 // We were loaded before our templated declaration was. We've not set up
2108 // its corresponding type yet (see VisitCXXRecordDeclImpl), so reconstruct
2109 // it now.
2110 Reader.getContext().getInjectedClassNameType(
2111 D->getTemplatedDecl(), D->getInjectedClassNameSpecialization());
2112 }
2113 }
2114
VisitBuiltinTemplateDecl(BuiltinTemplateDecl * D)2115 void ASTDeclReader::VisitBuiltinTemplateDecl(BuiltinTemplateDecl *D) {
2116 llvm_unreachable("BuiltinTemplates are not serialized");
2117 }
2118
2119 /// TODO: Unify with ClassTemplateDecl version?
2120 /// May require unifying ClassTemplateDecl and
2121 /// VarTemplateDecl beyond TemplateDecl...
VisitVarTemplateDecl(VarTemplateDecl * D)2122 void ASTDeclReader::VisitVarTemplateDecl(VarTemplateDecl *D) {
2123 RedeclarableResult Redecl = VisitRedeclarableTemplateDecl(D);
2124
2125 if (ThisDeclID == Redecl.getFirstID()) {
2126 // This VarTemplateDecl owns a CommonPtr; read it to keep track of all of
2127 // the specializations.
2128 SmallVector<serialization::DeclID, 32> SpecIDs;
2129 readDeclIDList(SpecIDs);
2130 ASTDeclReader::AddLazySpecializations(D, SpecIDs);
2131 }
2132 }
2133
2134 ASTDeclReader::RedeclarableResult
VisitClassTemplateSpecializationDeclImpl(ClassTemplateSpecializationDecl * D)2135 ASTDeclReader::VisitClassTemplateSpecializationDeclImpl(
2136 ClassTemplateSpecializationDecl *D) {
2137 RedeclarableResult Redecl = VisitCXXRecordDeclImpl(D);
2138
2139 ASTContext &C = Reader.getContext();
2140 if (Decl *InstD = readDecl()) {
2141 if (auto *CTD = dyn_cast<ClassTemplateDecl>(InstD)) {
2142 D->SpecializedTemplate = CTD;
2143 } else {
2144 SmallVector<TemplateArgument, 8> TemplArgs;
2145 Record.readTemplateArgumentList(TemplArgs);
2146 TemplateArgumentList *ArgList
2147 = TemplateArgumentList::CreateCopy(C, TemplArgs);
2148 auto *PS =
2149 new (C) ClassTemplateSpecializationDecl::
2150 SpecializedPartialSpecialization();
2151 PS->PartialSpecialization
2152 = cast<ClassTemplatePartialSpecializationDecl>(InstD);
2153 PS->TemplateArgs = ArgList;
2154 D->SpecializedTemplate = PS;
2155 }
2156 }
2157
2158 SmallVector<TemplateArgument, 8> TemplArgs;
2159 Record.readTemplateArgumentList(TemplArgs, /*Canonicalize*/ true);
2160 D->TemplateArgs = TemplateArgumentList::CreateCopy(C, TemplArgs);
2161 D->PointOfInstantiation = readSourceLocation();
2162 D->SpecializationKind = (TemplateSpecializationKind)Record.readInt();
2163
2164 bool writtenAsCanonicalDecl = Record.readInt();
2165 if (writtenAsCanonicalDecl) {
2166 auto *CanonPattern = readDeclAs<ClassTemplateDecl>();
2167 if (D->isCanonicalDecl()) { // It's kept in the folding set.
2168 // Set this as, or find, the canonical declaration for this specialization
2169 ClassTemplateSpecializationDecl *CanonSpec;
2170 if (auto *Partial = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) {
2171 CanonSpec = CanonPattern->getCommonPtr()->PartialSpecializations
2172 .GetOrInsertNode(Partial);
2173 } else {
2174 CanonSpec =
2175 CanonPattern->getCommonPtr()->Specializations.GetOrInsertNode(D);
2176 }
2177 // If there was already a canonical specialization, merge into it.
2178 if (CanonSpec != D) {
2179 mergeRedeclarable<TagDecl>(D, CanonSpec, Redecl);
2180
2181 // This declaration might be a definition. Merge with any existing
2182 // definition.
2183 if (auto *DDD = D->DefinitionData) {
2184 if (CanonSpec->DefinitionData)
2185 MergeDefinitionData(CanonSpec, std::move(*DDD));
2186 else
2187 CanonSpec->DefinitionData = D->DefinitionData;
2188 }
2189 D->DefinitionData = CanonSpec->DefinitionData;
2190 }
2191 }
2192 }
2193
2194 // Explicit info.
2195 if (TypeSourceInfo *TyInfo = readTypeSourceInfo()) {
2196 auto *ExplicitInfo =
2197 new (C) ClassTemplateSpecializationDecl::ExplicitSpecializationInfo;
2198 ExplicitInfo->TypeAsWritten = TyInfo;
2199 ExplicitInfo->ExternLoc = readSourceLocation();
2200 ExplicitInfo->TemplateKeywordLoc = readSourceLocation();
2201 D->ExplicitInfo = ExplicitInfo;
2202 }
2203
2204 return Redecl;
2205 }
2206
VisitClassTemplatePartialSpecializationDecl(ClassTemplatePartialSpecializationDecl * D)2207 void ASTDeclReader::VisitClassTemplatePartialSpecializationDecl(
2208 ClassTemplatePartialSpecializationDecl *D) {
2209 // We need to read the template params first because redeclarable is going to
2210 // need them for profiling
2211 TemplateParameterList *Params = Record.readTemplateParameterList();
2212 D->TemplateParams = Params;
2213 D->ArgsAsWritten = Record.readASTTemplateArgumentListInfo();
2214
2215 RedeclarableResult Redecl = VisitClassTemplateSpecializationDeclImpl(D);
2216
2217 // These are read/set from/to the first declaration.
2218 if (ThisDeclID == Redecl.getFirstID()) {
2219 D->InstantiatedFromMember.setPointer(
2220 readDeclAs<ClassTemplatePartialSpecializationDecl>());
2221 D->InstantiatedFromMember.setInt(Record.readInt());
2222 }
2223 }
2224
VisitClassScopeFunctionSpecializationDecl(ClassScopeFunctionSpecializationDecl * D)2225 void ASTDeclReader::VisitClassScopeFunctionSpecializationDecl(
2226 ClassScopeFunctionSpecializationDecl *D) {
2227 VisitDecl(D);
2228 D->Specialization = readDeclAs<CXXMethodDecl>();
2229 if (Record.readInt())
2230 D->TemplateArgs = Record.readASTTemplateArgumentListInfo();
2231 }
2232
VisitFunctionTemplateDecl(FunctionTemplateDecl * D)2233 void ASTDeclReader::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) {
2234 RedeclarableResult Redecl = VisitRedeclarableTemplateDecl(D);
2235
2236 if (ThisDeclID == Redecl.getFirstID()) {
2237 // This FunctionTemplateDecl owns a CommonPtr; read it.
2238 SmallVector<serialization::DeclID, 32> SpecIDs;
2239 readDeclIDList(SpecIDs);
2240 ASTDeclReader::AddLazySpecializations(D, SpecIDs);
2241 }
2242 }
2243
2244 /// TODO: Unify with ClassTemplateSpecializationDecl version?
2245 /// May require unifying ClassTemplate(Partial)SpecializationDecl and
2246 /// VarTemplate(Partial)SpecializationDecl with a new data
2247 /// structure Template(Partial)SpecializationDecl, and
2248 /// using Template(Partial)SpecializationDecl as input type.
2249 ASTDeclReader::RedeclarableResult
VisitVarTemplateSpecializationDeclImpl(VarTemplateSpecializationDecl * D)2250 ASTDeclReader::VisitVarTemplateSpecializationDeclImpl(
2251 VarTemplateSpecializationDecl *D) {
2252 RedeclarableResult Redecl = VisitVarDeclImpl(D);
2253
2254 ASTContext &C = Reader.getContext();
2255 if (Decl *InstD = readDecl()) {
2256 if (auto *VTD = dyn_cast<VarTemplateDecl>(InstD)) {
2257 D->SpecializedTemplate = VTD;
2258 } else {
2259 SmallVector<TemplateArgument, 8> TemplArgs;
2260 Record.readTemplateArgumentList(TemplArgs);
2261 TemplateArgumentList *ArgList = TemplateArgumentList::CreateCopy(
2262 C, TemplArgs);
2263 auto *PS =
2264 new (C)
2265 VarTemplateSpecializationDecl::SpecializedPartialSpecialization();
2266 PS->PartialSpecialization =
2267 cast<VarTemplatePartialSpecializationDecl>(InstD);
2268 PS->TemplateArgs = ArgList;
2269 D->SpecializedTemplate = PS;
2270 }
2271 }
2272
2273 // Explicit info.
2274 if (TypeSourceInfo *TyInfo = readTypeSourceInfo()) {
2275 auto *ExplicitInfo =
2276 new (C) VarTemplateSpecializationDecl::ExplicitSpecializationInfo;
2277 ExplicitInfo->TypeAsWritten = TyInfo;
2278 ExplicitInfo->ExternLoc = readSourceLocation();
2279 ExplicitInfo->TemplateKeywordLoc = readSourceLocation();
2280 D->ExplicitInfo = ExplicitInfo;
2281 }
2282
2283 SmallVector<TemplateArgument, 8> TemplArgs;
2284 Record.readTemplateArgumentList(TemplArgs, /*Canonicalize*/ true);
2285 D->TemplateArgs = TemplateArgumentList::CreateCopy(C, TemplArgs);
2286 D->PointOfInstantiation = readSourceLocation();
2287 D->SpecializationKind = (TemplateSpecializationKind)Record.readInt();
2288 D->IsCompleteDefinition = Record.readInt();
2289
2290 bool writtenAsCanonicalDecl = Record.readInt();
2291 if (writtenAsCanonicalDecl) {
2292 auto *CanonPattern = readDeclAs<VarTemplateDecl>();
2293 if (D->isCanonicalDecl()) { // It's kept in the folding set.
2294 // FIXME: If it's already present, merge it.
2295 if (auto *Partial = dyn_cast<VarTemplatePartialSpecializationDecl>(D)) {
2296 CanonPattern->getCommonPtr()->PartialSpecializations
2297 .GetOrInsertNode(Partial);
2298 } else {
2299 CanonPattern->getCommonPtr()->Specializations.GetOrInsertNode(D);
2300 }
2301 }
2302 }
2303
2304 return Redecl;
2305 }
2306
2307 /// TODO: Unify with ClassTemplatePartialSpecializationDecl version?
2308 /// May require unifying ClassTemplate(Partial)SpecializationDecl and
2309 /// VarTemplate(Partial)SpecializationDecl with a new data
2310 /// structure Template(Partial)SpecializationDecl, and
2311 /// using Template(Partial)SpecializationDecl as input type.
VisitVarTemplatePartialSpecializationDecl(VarTemplatePartialSpecializationDecl * D)2312 void ASTDeclReader::VisitVarTemplatePartialSpecializationDecl(
2313 VarTemplatePartialSpecializationDecl *D) {
2314 TemplateParameterList *Params = Record.readTemplateParameterList();
2315 D->TemplateParams = Params;
2316 D->ArgsAsWritten = Record.readASTTemplateArgumentListInfo();
2317
2318 RedeclarableResult Redecl = VisitVarTemplateSpecializationDeclImpl(D);
2319
2320 // These are read/set from/to the first declaration.
2321 if (ThisDeclID == Redecl.getFirstID()) {
2322 D->InstantiatedFromMember.setPointer(
2323 readDeclAs<VarTemplatePartialSpecializationDecl>());
2324 D->InstantiatedFromMember.setInt(Record.readInt());
2325 }
2326 }
2327
VisitTemplateTypeParmDecl(TemplateTypeParmDecl * D)2328 void ASTDeclReader::VisitTemplateTypeParmDecl(TemplateTypeParmDecl *D) {
2329 VisitTypeDecl(D);
2330
2331 D->setDeclaredWithTypename(Record.readInt());
2332
2333 if (Record.readBool()) {
2334 NestedNameSpecifierLoc NNS = Record.readNestedNameSpecifierLoc();
2335 DeclarationNameInfo DN = Record.readDeclarationNameInfo();
2336 ConceptDecl *NamedConcept = Record.readDeclAs<ConceptDecl>();
2337 const ASTTemplateArgumentListInfo *ArgsAsWritten = nullptr;
2338 if (Record.readBool())
2339 ArgsAsWritten = Record.readASTTemplateArgumentListInfo();
2340 Expr *ImmediatelyDeclaredConstraint = Record.readExpr();
2341 D->setTypeConstraint(NNS, DN, /*FoundDecl=*/nullptr, NamedConcept,
2342 ArgsAsWritten, ImmediatelyDeclaredConstraint);
2343 if ((D->ExpandedParameterPack = Record.readInt()))
2344 D->NumExpanded = Record.readInt();
2345 }
2346
2347 if (Record.readInt())
2348 D->setDefaultArgument(readTypeSourceInfo());
2349 }
2350
VisitNonTypeTemplateParmDecl(NonTypeTemplateParmDecl * D)2351 void ASTDeclReader::VisitNonTypeTemplateParmDecl(NonTypeTemplateParmDecl *D) {
2352 VisitDeclaratorDecl(D);
2353 // TemplateParmPosition.
2354 D->setDepth(Record.readInt());
2355 D->setPosition(Record.readInt());
2356 if (D->hasPlaceholderTypeConstraint())
2357 D->setPlaceholderTypeConstraint(Record.readExpr());
2358 if (D->isExpandedParameterPack()) {
2359 auto TypesAndInfos =
2360 D->getTrailingObjects<std::pair<QualType, TypeSourceInfo *>>();
2361 for (unsigned I = 0, N = D->getNumExpansionTypes(); I != N; ++I) {
2362 new (&TypesAndInfos[I].first) QualType(Record.readType());
2363 TypesAndInfos[I].second = readTypeSourceInfo();
2364 }
2365 } else {
2366 // Rest of NonTypeTemplateParmDecl.
2367 D->ParameterPack = Record.readInt();
2368 if (Record.readInt())
2369 D->setDefaultArgument(Record.readExpr());
2370 }
2371 }
2372
VisitTemplateTemplateParmDecl(TemplateTemplateParmDecl * D)2373 void ASTDeclReader::VisitTemplateTemplateParmDecl(TemplateTemplateParmDecl *D) {
2374 VisitTemplateDecl(D);
2375 // TemplateParmPosition.
2376 D->setDepth(Record.readInt());
2377 D->setPosition(Record.readInt());
2378 if (D->isExpandedParameterPack()) {
2379 auto **Data = D->getTrailingObjects<TemplateParameterList *>();
2380 for (unsigned I = 0, N = D->getNumExpansionTemplateParameters();
2381 I != N; ++I)
2382 Data[I] = Record.readTemplateParameterList();
2383 } else {
2384 // Rest of TemplateTemplateParmDecl.
2385 D->ParameterPack = Record.readInt();
2386 if (Record.readInt())
2387 D->setDefaultArgument(Reader.getContext(),
2388 Record.readTemplateArgumentLoc());
2389 }
2390 }
2391
VisitTypeAliasTemplateDecl(TypeAliasTemplateDecl * D)2392 void ASTDeclReader::VisitTypeAliasTemplateDecl(TypeAliasTemplateDecl *D) {
2393 VisitRedeclarableTemplateDecl(D);
2394 }
2395
VisitStaticAssertDecl(StaticAssertDecl * D)2396 void ASTDeclReader::VisitStaticAssertDecl(StaticAssertDecl *D) {
2397 VisitDecl(D);
2398 D->AssertExprAndFailed.setPointer(Record.readExpr());
2399 D->AssertExprAndFailed.setInt(Record.readInt());
2400 D->Message = cast_or_null<StringLiteral>(Record.readExpr());
2401 D->RParenLoc = readSourceLocation();
2402 }
2403
VisitEmptyDecl(EmptyDecl * D)2404 void ASTDeclReader::VisitEmptyDecl(EmptyDecl *D) {
2405 VisitDecl(D);
2406 }
2407
VisitLifetimeExtendedTemporaryDecl(LifetimeExtendedTemporaryDecl * D)2408 void ASTDeclReader::VisitLifetimeExtendedTemporaryDecl(
2409 LifetimeExtendedTemporaryDecl *D) {
2410 VisitDecl(D);
2411 D->ExtendingDecl = readDeclAs<ValueDecl>();
2412 D->ExprWithTemporary = Record.readStmt();
2413 if (Record.readInt())
2414 D->Value = new (D->getASTContext()) APValue(Record.readAPValue());
2415 D->ManglingNumber = Record.readInt();
2416 mergeMergeable(D);
2417 }
2418
2419 std::pair<uint64_t, uint64_t>
VisitDeclContext(DeclContext * DC)2420 ASTDeclReader::VisitDeclContext(DeclContext *DC) {
2421 uint64_t LexicalOffset = ReadLocalOffset();
2422 uint64_t VisibleOffset = ReadLocalOffset();
2423 return std::make_pair(LexicalOffset, VisibleOffset);
2424 }
2425
2426 template <typename T>
2427 ASTDeclReader::RedeclarableResult
VisitRedeclarable(Redeclarable<T> * D)2428 ASTDeclReader::VisitRedeclarable(Redeclarable<T> *D) {
2429 DeclID FirstDeclID = readDeclID();
2430 Decl *MergeWith = nullptr;
2431
2432 bool IsKeyDecl = ThisDeclID == FirstDeclID;
2433 bool IsFirstLocalDecl = false;
2434
2435 uint64_t RedeclOffset = 0;
2436
2437 // 0 indicates that this declaration was the only declaration of its entity,
2438 // and is used for space optimization.
2439 if (FirstDeclID == 0) {
2440 FirstDeclID = ThisDeclID;
2441 IsKeyDecl = true;
2442 IsFirstLocalDecl = true;
2443 } else if (unsigned N = Record.readInt()) {
2444 // This declaration was the first local declaration, but may have imported
2445 // other declarations.
2446 IsKeyDecl = N == 1;
2447 IsFirstLocalDecl = true;
2448
2449 // We have some declarations that must be before us in our redeclaration
2450 // chain. Read them now, and remember that we ought to merge with one of
2451 // them.
2452 // FIXME: Provide a known merge target to the second and subsequent such
2453 // declaration.
2454 for (unsigned I = 0; I != N - 1; ++I)
2455 MergeWith = readDecl();
2456
2457 RedeclOffset = ReadLocalOffset();
2458 } else {
2459 // This declaration was not the first local declaration. Read the first
2460 // local declaration now, to trigger the import of other redeclarations.
2461 (void)readDecl();
2462 }
2463
2464 auto *FirstDecl = cast_or_null<T>(Reader.GetDecl(FirstDeclID));
2465 if (FirstDecl != D) {
2466 // We delay loading of the redeclaration chain to avoid deeply nested calls.
2467 // We temporarily set the first (canonical) declaration as the previous one
2468 // which is the one that matters and mark the real previous DeclID to be
2469 // loaded & attached later on.
2470 D->RedeclLink = Redeclarable<T>::PreviousDeclLink(FirstDecl);
2471 D->First = FirstDecl->getCanonicalDecl();
2472 }
2473
2474 auto *DAsT = static_cast<T *>(D);
2475
2476 // Note that we need to load local redeclarations of this decl and build a
2477 // decl chain for them. This must happen *after* we perform the preloading
2478 // above; this ensures that the redeclaration chain is built in the correct
2479 // order.
2480 if (IsFirstLocalDecl)
2481 Reader.PendingDeclChains.push_back(std::make_pair(DAsT, RedeclOffset));
2482
2483 return RedeclarableResult(MergeWith, FirstDeclID, IsKeyDecl);
2484 }
2485
2486 /// Attempts to merge the given declaration (D) with another declaration
2487 /// of the same entity.
2488 template<typename T>
mergeRedeclarable(Redeclarable<T> * DBase,RedeclarableResult & Redecl,DeclID TemplatePatternID)2489 void ASTDeclReader::mergeRedeclarable(Redeclarable<T> *DBase,
2490 RedeclarableResult &Redecl,
2491 DeclID TemplatePatternID) {
2492 // If modules are not available, there is no reason to perform this merge.
2493 if (!Reader.getContext().getLangOpts().Modules)
2494 return;
2495
2496 // If we're not the canonical declaration, we don't need to merge.
2497 if (!DBase->isFirstDecl())
2498 return;
2499
2500 auto *D = static_cast<T *>(DBase);
2501
2502 if (auto *Existing = Redecl.getKnownMergeTarget())
2503 // We already know of an existing declaration we should merge with.
2504 mergeRedeclarable(D, cast<T>(Existing), Redecl, TemplatePatternID);
2505 else if (FindExistingResult ExistingRes = findExisting(D))
2506 if (T *Existing = ExistingRes)
2507 mergeRedeclarable(D, Existing, Redecl, TemplatePatternID);
2508 }
2509
2510 /// "Cast" to type T, asserting if we don't have an implicit conversion.
2511 /// We use this to put code in a template that will only be valid for certain
2512 /// instantiations.
assert_cast(T t)2513 template<typename T> static T assert_cast(T t) { return t; }
assert_cast(...)2514 template<typename T> static T assert_cast(...) {
2515 llvm_unreachable("bad assert_cast");
2516 }
2517
2518 /// Merge together the pattern declarations from two template
2519 /// declarations.
mergeTemplatePattern(RedeclarableTemplateDecl * D,RedeclarableTemplateDecl * Existing,DeclID DsID,bool IsKeyDecl)2520 void ASTDeclReader::mergeTemplatePattern(RedeclarableTemplateDecl *D,
2521 RedeclarableTemplateDecl *Existing,
2522 DeclID DsID, bool IsKeyDecl) {
2523 auto *DPattern = D->getTemplatedDecl();
2524 auto *ExistingPattern = Existing->getTemplatedDecl();
2525 RedeclarableResult Result(/*MergeWith*/ ExistingPattern,
2526 DPattern->getCanonicalDecl()->getGlobalID(),
2527 IsKeyDecl);
2528
2529 if (auto *DClass = dyn_cast<CXXRecordDecl>(DPattern)) {
2530 // Merge with any existing definition.
2531 // FIXME: This is duplicated in several places. Refactor.
2532 auto *ExistingClass =
2533 cast<CXXRecordDecl>(ExistingPattern)->getCanonicalDecl();
2534 if (auto *DDD = DClass->DefinitionData) {
2535 if (ExistingClass->DefinitionData) {
2536 MergeDefinitionData(ExistingClass, std::move(*DDD));
2537 } else {
2538 ExistingClass->DefinitionData = DClass->DefinitionData;
2539 // We may have skipped this before because we thought that DClass
2540 // was the canonical declaration.
2541 Reader.PendingDefinitions.insert(DClass);
2542 }
2543 }
2544 DClass->DefinitionData = ExistingClass->DefinitionData;
2545
2546 return mergeRedeclarable(DClass, cast<TagDecl>(ExistingPattern),
2547 Result);
2548 }
2549 if (auto *DFunction = dyn_cast<FunctionDecl>(DPattern))
2550 return mergeRedeclarable(DFunction, cast<FunctionDecl>(ExistingPattern),
2551 Result);
2552 if (auto *DVar = dyn_cast<VarDecl>(DPattern))
2553 return mergeRedeclarable(DVar, cast<VarDecl>(ExistingPattern), Result);
2554 if (auto *DAlias = dyn_cast<TypeAliasDecl>(DPattern))
2555 return mergeRedeclarable(DAlias, cast<TypedefNameDecl>(ExistingPattern),
2556 Result);
2557 llvm_unreachable("merged an unknown kind of redeclarable template");
2558 }
2559
2560 /// Attempts to merge the given declaration (D) with another declaration
2561 /// of the same entity.
2562 template<typename T>
mergeRedeclarable(Redeclarable<T> * DBase,T * Existing,RedeclarableResult & Redecl,DeclID TemplatePatternID)2563 void ASTDeclReader::mergeRedeclarable(Redeclarable<T> *DBase, T *Existing,
2564 RedeclarableResult &Redecl,
2565 DeclID TemplatePatternID) {
2566 auto *D = static_cast<T *>(DBase);
2567 T *ExistingCanon = Existing->getCanonicalDecl();
2568 T *DCanon = D->getCanonicalDecl();
2569 if (ExistingCanon != DCanon) {
2570 assert(DCanon->getGlobalID() == Redecl.getFirstID() &&
2571 "already merged this declaration");
2572
2573 // Have our redeclaration link point back at the canonical declaration
2574 // of the existing declaration, so that this declaration has the
2575 // appropriate canonical declaration.
2576 D->RedeclLink = Redeclarable<T>::PreviousDeclLink(ExistingCanon);
2577 D->First = ExistingCanon;
2578 ExistingCanon->Used |= D->Used;
2579 D->Used = false;
2580
2581 // When we merge a namespace, update its pointer to the first namespace.
2582 // We cannot have loaded any redeclarations of this declaration yet, so
2583 // there's nothing else that needs to be updated.
2584 if (auto *Namespace = dyn_cast<NamespaceDecl>(D))
2585 Namespace->AnonOrFirstNamespaceAndInline.setPointer(
2586 assert_cast<NamespaceDecl*>(ExistingCanon));
2587
2588 // When we merge a template, merge its pattern.
2589 if (auto *DTemplate = dyn_cast<RedeclarableTemplateDecl>(D))
2590 mergeTemplatePattern(
2591 DTemplate, assert_cast<RedeclarableTemplateDecl*>(ExistingCanon),
2592 TemplatePatternID, Redecl.isKeyDecl());
2593
2594 // If this declaration is a key declaration, make a note of that.
2595 if (Redecl.isKeyDecl())
2596 Reader.KeyDecls[ExistingCanon].push_back(Redecl.getFirstID());
2597 }
2598 }
2599
2600 /// ODR-like semantics for C/ObjC allow us to merge tag types and a structural
2601 /// check in Sema guarantees the types can be merged (see C11 6.2.7/1 or C89
2602 /// 6.1.2.6/1). Although most merging is done in Sema, we need to guarantee
2603 /// that some types are mergeable during deserialization, otherwise name
2604 /// lookup fails. This is the case for EnumConstantDecl.
allowODRLikeMergeInC(NamedDecl * ND)2605 static bool allowODRLikeMergeInC(NamedDecl *ND) {
2606 if (!ND)
2607 return false;
2608 // TODO: implement merge for other necessary decls.
2609 if (isa<EnumConstantDecl>(ND))
2610 return true;
2611 return false;
2612 }
2613
2614 /// Attempts to merge LifetimeExtendedTemporaryDecl with
2615 /// identical class definitions from two different modules.
mergeMergeable(LifetimeExtendedTemporaryDecl * D)2616 void ASTDeclReader::mergeMergeable(LifetimeExtendedTemporaryDecl *D) {
2617 // If modules are not available, there is no reason to perform this merge.
2618 if (!Reader.getContext().getLangOpts().Modules)
2619 return;
2620
2621 LifetimeExtendedTemporaryDecl *LETDecl = D;
2622
2623 LifetimeExtendedTemporaryDecl *&LookupResult =
2624 Reader.LETemporaryForMerging[std::make_pair(
2625 LETDecl->getExtendingDecl(), LETDecl->getManglingNumber())];
2626 if (LookupResult)
2627 Reader.getContext().setPrimaryMergedDecl(LETDecl,
2628 LookupResult->getCanonicalDecl());
2629 else
2630 LookupResult = LETDecl;
2631 }
2632
2633 /// Attempts to merge the given declaration (D) with another declaration
2634 /// of the same entity, for the case where the entity is not actually
2635 /// redeclarable. This happens, for instance, when merging the fields of
2636 /// identical class definitions from two different modules.
2637 template<typename T>
mergeMergeable(Mergeable<T> * D)2638 void ASTDeclReader::mergeMergeable(Mergeable<T> *D) {
2639 // If modules are not available, there is no reason to perform this merge.
2640 if (!Reader.getContext().getLangOpts().Modules)
2641 return;
2642
2643 // ODR-based merging is performed in C++ and in some cases (tag types) in C.
2644 // Note that C identically-named things in different translation units are
2645 // not redeclarations, but may still have compatible types, where ODR-like
2646 // semantics may apply.
2647 if (!Reader.getContext().getLangOpts().CPlusPlus &&
2648 !allowODRLikeMergeInC(dyn_cast<NamedDecl>(static_cast<T*>(D))))
2649 return;
2650
2651 if (FindExistingResult ExistingRes = findExisting(static_cast<T*>(D)))
2652 if (T *Existing = ExistingRes)
2653 Reader.getContext().setPrimaryMergedDecl(static_cast<T *>(D),
2654 Existing->getCanonicalDecl());
2655 }
2656
VisitOMPThreadPrivateDecl(OMPThreadPrivateDecl * D)2657 void ASTDeclReader::VisitOMPThreadPrivateDecl(OMPThreadPrivateDecl *D) {
2658 VisitDecl(D);
2659 unsigned NumVars = D->varlist_size();
2660 SmallVector<Expr *, 16> Vars;
2661 Vars.reserve(NumVars);
2662 for (unsigned i = 0; i != NumVars; ++i) {
2663 Vars.push_back(Record.readExpr());
2664 }
2665 D->setVars(Vars);
2666 }
2667
VisitOMPAllocateDecl(OMPAllocateDecl * D)2668 void ASTDeclReader::VisitOMPAllocateDecl(OMPAllocateDecl *D) {
2669 VisitDecl(D);
2670 unsigned NumVars = D->varlist_size();
2671 unsigned NumClauses = D->clauselist_size();
2672 SmallVector<Expr *, 16> Vars;
2673 Vars.reserve(NumVars);
2674 for (unsigned i = 0; i != NumVars; ++i) {
2675 Vars.push_back(Record.readExpr());
2676 }
2677 D->setVars(Vars);
2678 SmallVector<OMPClause *, 8> Clauses;
2679 Clauses.reserve(NumClauses);
2680 for (unsigned I = 0; I != NumClauses; ++I)
2681 Clauses.push_back(Record.readOMPClause());
2682 D->setClauses(Clauses);
2683 }
2684
VisitOMPRequiresDecl(OMPRequiresDecl * D)2685 void ASTDeclReader::VisitOMPRequiresDecl(OMPRequiresDecl * D) {
2686 VisitDecl(D);
2687 unsigned NumClauses = D->clauselist_size();
2688 SmallVector<OMPClause *, 8> Clauses;
2689 Clauses.reserve(NumClauses);
2690 for (unsigned I = 0; I != NumClauses; ++I)
2691 Clauses.push_back(Record.readOMPClause());
2692 D->setClauses(Clauses);
2693 }
2694
VisitOMPDeclareReductionDecl(OMPDeclareReductionDecl * D)2695 void ASTDeclReader::VisitOMPDeclareReductionDecl(OMPDeclareReductionDecl *D) {
2696 VisitValueDecl(D);
2697 D->setLocation(readSourceLocation());
2698 Expr *In = Record.readExpr();
2699 Expr *Out = Record.readExpr();
2700 D->setCombinerData(In, Out);
2701 Expr *Combiner = Record.readExpr();
2702 D->setCombiner(Combiner);
2703 Expr *Orig = Record.readExpr();
2704 Expr *Priv = Record.readExpr();
2705 D->setInitializerData(Orig, Priv);
2706 Expr *Init = Record.readExpr();
2707 auto IK = static_cast<OMPDeclareReductionDecl::InitKind>(Record.readInt());
2708 D->setInitializer(Init, IK);
2709 D->PrevDeclInScope = readDeclID();
2710 }
2711
VisitOMPDeclareMapperDecl(OMPDeclareMapperDecl * D)2712 void ASTDeclReader::VisitOMPDeclareMapperDecl(OMPDeclareMapperDecl *D) {
2713 VisitValueDecl(D);
2714 D->setLocation(readSourceLocation());
2715 Expr *MapperVarRefE = Record.readExpr();
2716 D->setMapperVarRef(MapperVarRefE);
2717 D->VarName = Record.readDeclarationName();
2718 D->PrevDeclInScope = readDeclID();
2719 unsigned NumClauses = D->clauselist_size();
2720 SmallVector<OMPClause *, 8> Clauses;
2721 Clauses.reserve(NumClauses);
2722 for (unsigned I = 0; I != NumClauses; ++I)
2723 Clauses.push_back(Record.readOMPClause());
2724 D->setClauses(Clauses);
2725 }
2726
VisitOMPCapturedExprDecl(OMPCapturedExprDecl * D)2727 void ASTDeclReader::VisitOMPCapturedExprDecl(OMPCapturedExprDecl *D) {
2728 VisitVarDecl(D);
2729 }
2730
2731 //===----------------------------------------------------------------------===//
2732 // Attribute Reading
2733 //===----------------------------------------------------------------------===//
2734
2735 namespace {
2736 class AttrReader {
2737 ASTRecordReader &Reader;
2738
2739 public:
AttrReader(ASTRecordReader & Reader)2740 AttrReader(ASTRecordReader &Reader) : Reader(Reader) {}
2741
readInt()2742 uint64_t readInt() {
2743 return Reader.readInt();
2744 }
2745
readSourceRange()2746 SourceRange readSourceRange() {
2747 return Reader.readSourceRange();
2748 }
2749
readSourceLocation()2750 SourceLocation readSourceLocation() {
2751 return Reader.readSourceLocation();
2752 }
2753
readExpr()2754 Expr *readExpr() { return Reader.readExpr(); }
2755
readString()2756 std::string readString() {
2757 return Reader.readString();
2758 }
2759
readTypeSourceInfo()2760 TypeSourceInfo *readTypeSourceInfo() {
2761 return Reader.readTypeSourceInfo();
2762 }
2763
readIdentifier()2764 IdentifierInfo *readIdentifier() {
2765 return Reader.readIdentifier();
2766 }
2767
readVersionTuple()2768 VersionTuple readVersionTuple() {
2769 return Reader.readVersionTuple();
2770 }
2771
readOMPTraitInfo()2772 OMPTraitInfo *readOMPTraitInfo() { return Reader.readOMPTraitInfo(); }
2773
GetLocalDeclAs(uint32_t LocalID)2774 template <typename T> T *GetLocalDeclAs(uint32_t LocalID) {
2775 return Reader.GetLocalDeclAs<T>(LocalID);
2776 }
2777 };
2778 }
2779
readAttr()2780 Attr *ASTRecordReader::readAttr() {
2781 AttrReader Record(*this);
2782 auto V = Record.readInt();
2783 if (!V)
2784 return nullptr;
2785
2786 Attr *New = nullptr;
2787 // Kind is stored as a 1-based integer because 0 is used to indicate a null
2788 // Attr pointer.
2789 auto Kind = static_cast<attr::Kind>(V - 1);
2790 ASTContext &Context = getContext();
2791
2792 IdentifierInfo *AttrName = Record.readIdentifier();
2793 IdentifierInfo *ScopeName = Record.readIdentifier();
2794 SourceRange AttrRange = Record.readSourceRange();
2795 SourceLocation ScopeLoc = Record.readSourceLocation();
2796 unsigned ParsedKind = Record.readInt();
2797 unsigned Syntax = Record.readInt();
2798 unsigned SpellingIndex = Record.readInt();
2799
2800 AttributeCommonInfo Info(AttrName, ScopeName, AttrRange, ScopeLoc,
2801 AttributeCommonInfo::Kind(ParsedKind),
2802 AttributeCommonInfo::Syntax(Syntax), SpellingIndex);
2803
2804 #include "clang/Serialization/AttrPCHRead.inc"
2805
2806 assert(New && "Unable to decode attribute?");
2807 return New;
2808 }
2809
2810 /// Reads attributes from the current stream position.
readAttributes(AttrVec & Attrs)2811 void ASTRecordReader::readAttributes(AttrVec &Attrs) {
2812 for (unsigned I = 0, E = readInt(); I != E; ++I)
2813 Attrs.push_back(readAttr());
2814 }
2815
2816 //===----------------------------------------------------------------------===//
2817 // ASTReader Implementation
2818 //===----------------------------------------------------------------------===//
2819
2820 /// Note that we have loaded the declaration with the given
2821 /// Index.
2822 ///
2823 /// This routine notes that this declaration has already been loaded,
2824 /// so that future GetDecl calls will return this declaration rather
2825 /// than trying to load a new declaration.
LoadedDecl(unsigned Index,Decl * D)2826 inline void ASTReader::LoadedDecl(unsigned Index, Decl *D) {
2827 assert(!DeclsLoaded[Index] && "Decl loaded twice?");
2828 DeclsLoaded[Index] = D;
2829 }
2830
2831 /// Determine whether the consumer will be interested in seeing
2832 /// this declaration (via HandleTopLevelDecl).
2833 ///
2834 /// This routine should return true for anything that might affect
2835 /// code generation, e.g., inline function definitions, Objective-C
2836 /// declarations with metadata, etc.
isConsumerInterestedIn(ASTContext & Ctx,Decl * D,bool HasBody)2837 static bool isConsumerInterestedIn(ASTContext &Ctx, Decl *D, bool HasBody) {
2838 // An ObjCMethodDecl is never considered as "interesting" because its
2839 // implementation container always is.
2840
2841 // An ImportDecl or VarDecl imported from a module map module will get
2842 // emitted when we import the relevant module.
2843 if (isPartOfPerModuleInitializer(D)) {
2844 auto *M = D->getImportedOwningModule();
2845 if (M && M->Kind == Module::ModuleMapModule &&
2846 Ctx.DeclMustBeEmitted(D))
2847 return false;
2848 }
2849
2850 if (isa<FileScopeAsmDecl>(D) ||
2851 isa<ObjCProtocolDecl>(D) ||
2852 isa<ObjCImplDecl>(D) ||
2853 isa<ImportDecl>(D) ||
2854 isa<PragmaCommentDecl>(D) ||
2855 isa<PragmaDetectMismatchDecl>(D))
2856 return true;
2857 if (isa<OMPThreadPrivateDecl>(D) || isa<OMPDeclareReductionDecl>(D) ||
2858 isa<OMPDeclareMapperDecl>(D) || isa<OMPAllocateDecl>(D) ||
2859 isa<OMPRequiresDecl>(D))
2860 return !D->getDeclContext()->isFunctionOrMethod();
2861 if (const auto *Var = dyn_cast<VarDecl>(D))
2862 return Var->isFileVarDecl() &&
2863 (Var->isThisDeclarationADefinition() == VarDecl::Definition ||
2864 OMPDeclareTargetDeclAttr::isDeclareTargetDeclaration(Var));
2865 if (const auto *Func = dyn_cast<FunctionDecl>(D))
2866 return Func->doesThisDeclarationHaveABody() || HasBody;
2867
2868 if (auto *ES = D->getASTContext().getExternalSource())
2869 if (ES->hasExternalDefinitions(D) == ExternalASTSource::EK_Never)
2870 return true;
2871
2872 return false;
2873 }
2874
2875 /// Get the correct cursor and offset for loading a declaration.
2876 ASTReader::RecordLocation
DeclCursorForID(DeclID ID,SourceLocation & Loc)2877 ASTReader::DeclCursorForID(DeclID ID, SourceLocation &Loc) {
2878 GlobalDeclMapType::iterator I = GlobalDeclMap.find(ID);
2879 assert(I != GlobalDeclMap.end() && "Corrupted global declaration map");
2880 ModuleFile *M = I->second;
2881 const DeclOffset &DOffs =
2882 M->DeclOffsets[ID - M->BaseDeclID - NUM_PREDEF_DECL_IDS];
2883 Loc = TranslateSourceLocation(*M, DOffs.getLocation());
2884 return RecordLocation(M, DOffs.getBitOffset(M->DeclsBlockStartOffset));
2885 }
2886
getLocalBitOffset(uint64_t GlobalOffset)2887 ASTReader::RecordLocation ASTReader::getLocalBitOffset(uint64_t GlobalOffset) {
2888 auto I = GlobalBitOffsetsMap.find(GlobalOffset);
2889
2890 assert(I != GlobalBitOffsetsMap.end() && "Corrupted global bit offsets map");
2891 return RecordLocation(I->second, GlobalOffset - I->second->GlobalBitOffset);
2892 }
2893
getGlobalBitOffset(ModuleFile & M,uint64_t LocalOffset)2894 uint64_t ASTReader::getGlobalBitOffset(ModuleFile &M, uint64_t LocalOffset) {
2895 return LocalOffset + M.GlobalBitOffset;
2896 }
2897
2898 static bool isSameTemplateParameterList(const ASTContext &C,
2899 const TemplateParameterList *X,
2900 const TemplateParameterList *Y);
2901
2902 /// Determine whether two template parameters are similar enough
2903 /// that they may be used in declarations of the same template.
isSameTemplateParameter(const NamedDecl * X,const NamedDecl * Y)2904 static bool isSameTemplateParameter(const NamedDecl *X,
2905 const NamedDecl *Y) {
2906 if (X->getKind() != Y->getKind())
2907 return false;
2908
2909 if (const auto *TX = dyn_cast<TemplateTypeParmDecl>(X)) {
2910 const auto *TY = cast<TemplateTypeParmDecl>(Y);
2911 if (TX->isParameterPack() != TY->isParameterPack())
2912 return false;
2913 if (TX->hasTypeConstraint() != TY->hasTypeConstraint())
2914 return false;
2915 if (TX->hasTypeConstraint()) {
2916 const TypeConstraint *TXTC = TX->getTypeConstraint();
2917 const TypeConstraint *TYTC = TY->getTypeConstraint();
2918 if (TXTC->getNamedConcept() != TYTC->getNamedConcept())
2919 return false;
2920 if (TXTC->hasExplicitTemplateArgs() != TYTC->hasExplicitTemplateArgs())
2921 return false;
2922 if (TXTC->hasExplicitTemplateArgs()) {
2923 const auto *TXTCArgs = TXTC->getTemplateArgsAsWritten();
2924 const auto *TYTCArgs = TYTC->getTemplateArgsAsWritten();
2925 if (TXTCArgs->NumTemplateArgs != TYTCArgs->NumTemplateArgs)
2926 return false;
2927 llvm::FoldingSetNodeID XID, YID;
2928 for (const auto &ArgLoc : TXTCArgs->arguments())
2929 ArgLoc.getArgument().Profile(XID, X->getASTContext());
2930 for (const auto &ArgLoc : TYTCArgs->arguments())
2931 ArgLoc.getArgument().Profile(YID, Y->getASTContext());
2932 if (XID != YID)
2933 return false;
2934 }
2935 }
2936 return true;
2937 }
2938
2939 if (const auto *TX = dyn_cast<NonTypeTemplateParmDecl>(X)) {
2940 const auto *TY = cast<NonTypeTemplateParmDecl>(Y);
2941 return TX->isParameterPack() == TY->isParameterPack() &&
2942 TX->getASTContext().hasSameType(TX->getType(), TY->getType());
2943 }
2944
2945 const auto *TX = cast<TemplateTemplateParmDecl>(X);
2946 const auto *TY = cast<TemplateTemplateParmDecl>(Y);
2947 return TX->isParameterPack() == TY->isParameterPack() &&
2948 isSameTemplateParameterList(TX->getASTContext(),
2949 TX->getTemplateParameters(),
2950 TY->getTemplateParameters());
2951 }
2952
getNamespace(const NestedNameSpecifier * X)2953 static NamespaceDecl *getNamespace(const NestedNameSpecifier *X) {
2954 if (auto *NS = X->getAsNamespace())
2955 return NS;
2956 if (auto *NAS = X->getAsNamespaceAlias())
2957 return NAS->getNamespace();
2958 return nullptr;
2959 }
2960
isSameQualifier(const NestedNameSpecifier * X,const NestedNameSpecifier * Y)2961 static bool isSameQualifier(const NestedNameSpecifier *X,
2962 const NestedNameSpecifier *Y) {
2963 if (auto *NSX = getNamespace(X)) {
2964 auto *NSY = getNamespace(Y);
2965 if (!NSY || NSX->getCanonicalDecl() != NSY->getCanonicalDecl())
2966 return false;
2967 } else if (X->getKind() != Y->getKind())
2968 return false;
2969
2970 // FIXME: For namespaces and types, we're permitted to check that the entity
2971 // is named via the same tokens. We should probably do so.
2972 switch (X->getKind()) {
2973 case NestedNameSpecifier::Identifier:
2974 if (X->getAsIdentifier() != Y->getAsIdentifier())
2975 return false;
2976 break;
2977 case NestedNameSpecifier::Namespace:
2978 case NestedNameSpecifier::NamespaceAlias:
2979 // We've already checked that we named the same namespace.
2980 break;
2981 case NestedNameSpecifier::TypeSpec:
2982 case NestedNameSpecifier::TypeSpecWithTemplate:
2983 if (X->getAsType()->getCanonicalTypeInternal() !=
2984 Y->getAsType()->getCanonicalTypeInternal())
2985 return false;
2986 break;
2987 case NestedNameSpecifier::Global:
2988 case NestedNameSpecifier::Super:
2989 return true;
2990 }
2991
2992 // Recurse into earlier portion of NNS, if any.
2993 auto *PX = X->getPrefix();
2994 auto *PY = Y->getPrefix();
2995 if (PX && PY)
2996 return isSameQualifier(PX, PY);
2997 return !PX && !PY;
2998 }
2999
3000 /// Determine whether two template parameter lists are similar enough
3001 /// that they may be used in declarations of the same template.
isSameTemplateParameterList(const ASTContext & C,const TemplateParameterList * X,const TemplateParameterList * Y)3002 static bool isSameTemplateParameterList(const ASTContext &C,
3003 const TemplateParameterList *X,
3004 const TemplateParameterList *Y) {
3005 if (X->size() != Y->size())
3006 return false;
3007
3008 for (unsigned I = 0, N = X->size(); I != N; ++I)
3009 if (!isSameTemplateParameter(X->getParam(I), Y->getParam(I)))
3010 return false;
3011
3012 const Expr *XRC = X->getRequiresClause();
3013 const Expr *YRC = Y->getRequiresClause();
3014 if (!XRC != !YRC)
3015 return false;
3016 if (XRC) {
3017 llvm::FoldingSetNodeID XRCID, YRCID;
3018 XRC->Profile(XRCID, C, /*Canonical=*/true);
3019 YRC->Profile(YRCID, C, /*Canonical=*/true);
3020 if (XRCID != YRCID)
3021 return false;
3022 }
3023
3024 return true;
3025 }
3026
3027 /// Determine whether the attributes we can overload on are identical for A and
3028 /// B. Will ignore any overloadable attrs represented in the type of A and B.
hasSameOverloadableAttrs(const FunctionDecl * A,const FunctionDecl * B)3029 static bool hasSameOverloadableAttrs(const FunctionDecl *A,
3030 const FunctionDecl *B) {
3031 // Note that pass_object_size attributes are represented in the function's
3032 // ExtParameterInfo, so we don't need to check them here.
3033
3034 llvm::FoldingSetNodeID Cand1ID, Cand2ID;
3035 auto AEnableIfAttrs = A->specific_attrs<EnableIfAttr>();
3036 auto BEnableIfAttrs = B->specific_attrs<EnableIfAttr>();
3037
3038 for (auto Pair : zip_longest(AEnableIfAttrs, BEnableIfAttrs)) {
3039 Optional<EnableIfAttr *> Cand1A = std::get<0>(Pair);
3040 Optional<EnableIfAttr *> Cand2A = std::get<1>(Pair);
3041
3042 // Return false if the number of enable_if attributes is different.
3043 if (!Cand1A || !Cand2A)
3044 return false;
3045
3046 Cand1ID.clear();
3047 Cand2ID.clear();
3048
3049 (*Cand1A)->getCond()->Profile(Cand1ID, A->getASTContext(), true);
3050 (*Cand2A)->getCond()->Profile(Cand2ID, B->getASTContext(), true);
3051
3052 // Return false if any of the enable_if expressions of A and B are
3053 // different.
3054 if (Cand1ID != Cand2ID)
3055 return false;
3056 }
3057 return true;
3058 }
3059
3060 /// Determine whether the two declarations refer to the same entity.pr
isSameEntity(NamedDecl * X,NamedDecl * Y)3061 static bool isSameEntity(NamedDecl *X, NamedDecl *Y) {
3062 assert(X->getDeclName() == Y->getDeclName() && "Declaration name mismatch!");
3063
3064 if (X == Y)
3065 return true;
3066
3067 // Must be in the same context.
3068 //
3069 // Note that we can't use DeclContext::Equals here, because the DeclContexts
3070 // could be two different declarations of the same function. (We will fix the
3071 // semantic DC to refer to the primary definition after merging.)
3072 if (!declaresSameEntity(cast<Decl>(X->getDeclContext()->getRedeclContext()),
3073 cast<Decl>(Y->getDeclContext()->getRedeclContext())))
3074 return false;
3075
3076 // Two typedefs refer to the same entity if they have the same underlying
3077 // type.
3078 if (const auto *TypedefX = dyn_cast<TypedefNameDecl>(X))
3079 if (const auto *TypedefY = dyn_cast<TypedefNameDecl>(Y))
3080 return X->getASTContext().hasSameType(TypedefX->getUnderlyingType(),
3081 TypedefY->getUnderlyingType());
3082
3083 // Must have the same kind.
3084 if (X->getKind() != Y->getKind())
3085 return false;
3086
3087 // Objective-C classes and protocols with the same name always match.
3088 if (isa<ObjCInterfaceDecl>(X) || isa<ObjCProtocolDecl>(X))
3089 return true;
3090
3091 if (isa<ClassTemplateSpecializationDecl>(X)) {
3092 // No need to handle these here: we merge them when adding them to the
3093 // template.
3094 return false;
3095 }
3096
3097 // Compatible tags match.
3098 if (const auto *TagX = dyn_cast<TagDecl>(X)) {
3099 const auto *TagY = cast<TagDecl>(Y);
3100 return (TagX->getTagKind() == TagY->getTagKind()) ||
3101 ((TagX->getTagKind() == TTK_Struct || TagX->getTagKind() == TTK_Class ||
3102 TagX->getTagKind() == TTK_Interface) &&
3103 (TagY->getTagKind() == TTK_Struct || TagY->getTagKind() == TTK_Class ||
3104 TagY->getTagKind() == TTK_Interface));
3105 }
3106
3107 // Functions with the same type and linkage match.
3108 // FIXME: This needs to cope with merging of prototyped/non-prototyped
3109 // functions, etc.
3110 if (const auto *FuncX = dyn_cast<FunctionDecl>(X)) {
3111 const auto *FuncY = cast<FunctionDecl>(Y);
3112 if (const auto *CtorX = dyn_cast<CXXConstructorDecl>(X)) {
3113 const auto *CtorY = cast<CXXConstructorDecl>(Y);
3114 if (CtorX->getInheritedConstructor() &&
3115 !isSameEntity(CtorX->getInheritedConstructor().getConstructor(),
3116 CtorY->getInheritedConstructor().getConstructor()))
3117 return false;
3118 }
3119
3120 if (FuncX->isMultiVersion() != FuncY->isMultiVersion())
3121 return false;
3122
3123 // Multiversioned functions with different feature strings are represented
3124 // as separate declarations.
3125 if (FuncX->isMultiVersion()) {
3126 const auto *TAX = FuncX->getAttr<TargetAttr>();
3127 const auto *TAY = FuncY->getAttr<TargetAttr>();
3128 assert(TAX && TAY && "Multiversion Function without target attribute");
3129
3130 if (TAX->getFeaturesStr() != TAY->getFeaturesStr())
3131 return false;
3132 }
3133
3134 ASTContext &C = FuncX->getASTContext();
3135
3136 const Expr *XRC = FuncX->getTrailingRequiresClause();
3137 const Expr *YRC = FuncY->getTrailingRequiresClause();
3138 if (!XRC != !YRC)
3139 return false;
3140 if (XRC) {
3141 llvm::FoldingSetNodeID XRCID, YRCID;
3142 XRC->Profile(XRCID, C, /*Canonical=*/true);
3143 YRC->Profile(YRCID, C, /*Canonical=*/true);
3144 if (XRCID != YRCID)
3145 return false;
3146 }
3147
3148 auto GetTypeAsWritten = [](const FunctionDecl *FD) {
3149 // Map to the first declaration that we've already merged into this one.
3150 // The TSI of redeclarations might not match (due to calling conventions
3151 // being inherited onto the type but not the TSI), but the TSI type of
3152 // the first declaration of the function should match across modules.
3153 FD = FD->getCanonicalDecl();
3154 return FD->getTypeSourceInfo() ? FD->getTypeSourceInfo()->getType()
3155 : FD->getType();
3156 };
3157 QualType XT = GetTypeAsWritten(FuncX), YT = GetTypeAsWritten(FuncY);
3158 if (!C.hasSameType(XT, YT)) {
3159 // We can get functions with different types on the redecl chain in C++17
3160 // if they have differing exception specifications and at least one of
3161 // the excpetion specs is unresolved.
3162 auto *XFPT = XT->getAs<FunctionProtoType>();
3163 auto *YFPT = YT->getAs<FunctionProtoType>();
3164 if (C.getLangOpts().CPlusPlus17 && XFPT && YFPT &&
3165 (isUnresolvedExceptionSpec(XFPT->getExceptionSpecType()) ||
3166 isUnresolvedExceptionSpec(YFPT->getExceptionSpecType())) &&
3167 C.hasSameFunctionTypeIgnoringExceptionSpec(XT, YT))
3168 return true;
3169 return false;
3170 }
3171
3172 return FuncX->getLinkageInternal() == FuncY->getLinkageInternal() &&
3173 hasSameOverloadableAttrs(FuncX, FuncY);
3174 }
3175
3176 // Variables with the same type and linkage match.
3177 if (const auto *VarX = dyn_cast<VarDecl>(X)) {
3178 const auto *VarY = cast<VarDecl>(Y);
3179 if (VarX->getLinkageInternal() == VarY->getLinkageInternal()) {
3180 ASTContext &C = VarX->getASTContext();
3181 if (C.hasSameType(VarX->getType(), VarY->getType()))
3182 return true;
3183
3184 // We can get decls with different types on the redecl chain. Eg.
3185 // template <typename T> struct S { static T Var[]; }; // #1
3186 // template <typename T> T S<T>::Var[sizeof(T)]; // #2
3187 // Only? happens when completing an incomplete array type. In this case
3188 // when comparing #1 and #2 we should go through their element type.
3189 const ArrayType *VarXTy = C.getAsArrayType(VarX->getType());
3190 const ArrayType *VarYTy = C.getAsArrayType(VarY->getType());
3191 if (!VarXTy || !VarYTy)
3192 return false;
3193 if (VarXTy->isIncompleteArrayType() || VarYTy->isIncompleteArrayType())
3194 return C.hasSameType(VarXTy->getElementType(), VarYTy->getElementType());
3195 }
3196 return false;
3197 }
3198
3199 // Namespaces with the same name and inlinedness match.
3200 if (const auto *NamespaceX = dyn_cast<NamespaceDecl>(X)) {
3201 const auto *NamespaceY = cast<NamespaceDecl>(Y);
3202 return NamespaceX->isInline() == NamespaceY->isInline();
3203 }
3204
3205 // Identical template names and kinds match if their template parameter lists
3206 // and patterns match.
3207 if (const auto *TemplateX = dyn_cast<TemplateDecl>(X)) {
3208 const auto *TemplateY = cast<TemplateDecl>(Y);
3209 return isSameEntity(TemplateX->getTemplatedDecl(),
3210 TemplateY->getTemplatedDecl()) &&
3211 isSameTemplateParameterList(TemplateX->getASTContext(),
3212 TemplateX->getTemplateParameters(),
3213 TemplateY->getTemplateParameters());
3214 }
3215
3216 // Fields with the same name and the same type match.
3217 if (const auto *FDX = dyn_cast<FieldDecl>(X)) {
3218 const auto *FDY = cast<FieldDecl>(Y);
3219 // FIXME: Also check the bitwidth is odr-equivalent, if any.
3220 return X->getASTContext().hasSameType(FDX->getType(), FDY->getType());
3221 }
3222
3223 // Indirect fields with the same target field match.
3224 if (const auto *IFDX = dyn_cast<IndirectFieldDecl>(X)) {
3225 const auto *IFDY = cast<IndirectFieldDecl>(Y);
3226 return IFDX->getAnonField()->getCanonicalDecl() ==
3227 IFDY->getAnonField()->getCanonicalDecl();
3228 }
3229
3230 // Enumerators with the same name match.
3231 if (isa<EnumConstantDecl>(X))
3232 // FIXME: Also check the value is odr-equivalent.
3233 return true;
3234
3235 // Using shadow declarations with the same target match.
3236 if (const auto *USX = dyn_cast<UsingShadowDecl>(X)) {
3237 const auto *USY = cast<UsingShadowDecl>(Y);
3238 return USX->getTargetDecl() == USY->getTargetDecl();
3239 }
3240
3241 // Using declarations with the same qualifier match. (We already know that
3242 // the name matches.)
3243 if (const auto *UX = dyn_cast<UsingDecl>(X)) {
3244 const auto *UY = cast<UsingDecl>(Y);
3245 return isSameQualifier(UX->getQualifier(), UY->getQualifier()) &&
3246 UX->hasTypename() == UY->hasTypename() &&
3247 UX->isAccessDeclaration() == UY->isAccessDeclaration();
3248 }
3249 if (const auto *UX = dyn_cast<UnresolvedUsingValueDecl>(X)) {
3250 const auto *UY = cast<UnresolvedUsingValueDecl>(Y);
3251 return isSameQualifier(UX->getQualifier(), UY->getQualifier()) &&
3252 UX->isAccessDeclaration() == UY->isAccessDeclaration();
3253 }
3254 if (const auto *UX = dyn_cast<UnresolvedUsingTypenameDecl>(X))
3255 return isSameQualifier(
3256 UX->getQualifier(),
3257 cast<UnresolvedUsingTypenameDecl>(Y)->getQualifier());
3258
3259 // Namespace alias definitions with the same target match.
3260 if (const auto *NAX = dyn_cast<NamespaceAliasDecl>(X)) {
3261 const auto *NAY = cast<NamespaceAliasDecl>(Y);
3262 return NAX->getNamespace()->Equals(NAY->getNamespace());
3263 }
3264
3265 return false;
3266 }
3267
3268 /// Find the context in which we should search for previous declarations when
3269 /// looking for declarations to merge.
getPrimaryContextForMerging(ASTReader & Reader,DeclContext * DC)3270 DeclContext *ASTDeclReader::getPrimaryContextForMerging(ASTReader &Reader,
3271 DeclContext *DC) {
3272 if (auto *ND = dyn_cast<NamespaceDecl>(DC))
3273 return ND->getOriginalNamespace();
3274
3275 if (auto *RD = dyn_cast<CXXRecordDecl>(DC)) {
3276 // Try to dig out the definition.
3277 auto *DD = RD->DefinitionData;
3278 if (!DD)
3279 DD = RD->getCanonicalDecl()->DefinitionData;
3280
3281 // If there's no definition yet, then DC's definition is added by an update
3282 // record, but we've not yet loaded that update record. In this case, we
3283 // commit to DC being the canonical definition now, and will fix this when
3284 // we load the update record.
3285 if (!DD) {
3286 DD = new (Reader.getContext()) struct CXXRecordDecl::DefinitionData(RD);
3287 RD->setCompleteDefinition(true);
3288 RD->DefinitionData = DD;
3289 RD->getCanonicalDecl()->DefinitionData = DD;
3290
3291 // Track that we did this horrible thing so that we can fix it later.
3292 Reader.PendingFakeDefinitionData.insert(
3293 std::make_pair(DD, ASTReader::PendingFakeDefinitionKind::Fake));
3294 }
3295
3296 return DD->Definition;
3297 }
3298
3299 if (auto *ED = dyn_cast<EnumDecl>(DC))
3300 return ED->getASTContext().getLangOpts().CPlusPlus? ED->getDefinition()
3301 : nullptr;
3302
3303 // We can see the TU here only if we have no Sema object. In that case,
3304 // there's no TU scope to look in, so using the DC alone is sufficient.
3305 if (auto *TU = dyn_cast<TranslationUnitDecl>(DC))
3306 return TU;
3307
3308 return nullptr;
3309 }
3310
~FindExistingResult()3311 ASTDeclReader::FindExistingResult::~FindExistingResult() {
3312 // Record that we had a typedef name for linkage whether or not we merge
3313 // with that declaration.
3314 if (TypedefNameForLinkage) {
3315 DeclContext *DC = New->getDeclContext()->getRedeclContext();
3316 Reader.ImportedTypedefNamesForLinkage.insert(
3317 std::make_pair(std::make_pair(DC, TypedefNameForLinkage), New));
3318 return;
3319 }
3320
3321 if (!AddResult || Existing)
3322 return;
3323
3324 DeclarationName Name = New->getDeclName();
3325 DeclContext *DC = New->getDeclContext()->getRedeclContext();
3326 if (needsAnonymousDeclarationNumber(New)) {
3327 setAnonymousDeclForMerging(Reader, New->getLexicalDeclContext(),
3328 AnonymousDeclNumber, New);
3329 } else if (DC->isTranslationUnit() &&
3330 !Reader.getContext().getLangOpts().CPlusPlus) {
3331 if (Reader.getIdResolver().tryAddTopLevelDecl(New, Name))
3332 Reader.PendingFakeLookupResults[Name.getAsIdentifierInfo()]
3333 .push_back(New);
3334 } else if (DeclContext *MergeDC = getPrimaryContextForMerging(Reader, DC)) {
3335 // Add the declaration to its redeclaration context so later merging
3336 // lookups will find it.
3337 MergeDC->makeDeclVisibleInContextImpl(New, /*Internal*/true);
3338 }
3339 }
3340
3341 /// Find the declaration that should be merged into, given the declaration found
3342 /// by name lookup. If we're merging an anonymous declaration within a typedef,
3343 /// we need a matching typedef, and we merge with the type inside it.
getDeclForMerging(NamedDecl * Found,bool IsTypedefNameForLinkage)3344 static NamedDecl *getDeclForMerging(NamedDecl *Found,
3345 bool IsTypedefNameForLinkage) {
3346 if (!IsTypedefNameForLinkage)
3347 return Found;
3348
3349 // If we found a typedef declaration that gives a name to some other
3350 // declaration, then we want that inner declaration. Declarations from
3351 // AST files are handled via ImportedTypedefNamesForLinkage.
3352 if (Found->isFromASTFile())
3353 return nullptr;
3354
3355 if (auto *TND = dyn_cast<TypedefNameDecl>(Found))
3356 return TND->getAnonDeclWithTypedefName(/*AnyRedecl*/true);
3357
3358 return nullptr;
3359 }
3360
3361 /// Find the declaration to use to populate the anonymous declaration table
3362 /// for the given lexical DeclContext. We only care about finding local
3363 /// definitions of the context; we'll merge imported ones as we go.
3364 DeclContext *
getPrimaryDCForAnonymousDecl(DeclContext * LexicalDC)3365 ASTDeclReader::getPrimaryDCForAnonymousDecl(DeclContext *LexicalDC) {
3366 // For classes, we track the definition as we merge.
3367 if (auto *RD = dyn_cast<CXXRecordDecl>(LexicalDC)) {
3368 auto *DD = RD->getCanonicalDecl()->DefinitionData;
3369 return DD ? DD->Definition : nullptr;
3370 }
3371
3372 // For anything else, walk its merged redeclarations looking for a definition.
3373 // Note that we can't just call getDefinition here because the redeclaration
3374 // chain isn't wired up.
3375 for (auto *D : merged_redecls(cast<Decl>(LexicalDC))) {
3376 if (auto *FD = dyn_cast<FunctionDecl>(D))
3377 if (FD->isThisDeclarationADefinition())
3378 return FD;
3379 if (auto *MD = dyn_cast<ObjCMethodDecl>(D))
3380 if (MD->isThisDeclarationADefinition())
3381 return MD;
3382 }
3383
3384 // No merged definition yet.
3385 return nullptr;
3386 }
3387
getAnonymousDeclForMerging(ASTReader & Reader,DeclContext * DC,unsigned Index)3388 NamedDecl *ASTDeclReader::getAnonymousDeclForMerging(ASTReader &Reader,
3389 DeclContext *DC,
3390 unsigned Index) {
3391 // If the lexical context has been merged, look into the now-canonical
3392 // definition.
3393 auto *CanonDC = cast<Decl>(DC)->getCanonicalDecl();
3394
3395 // If we've seen this before, return the canonical declaration.
3396 auto &Previous = Reader.AnonymousDeclarationsForMerging[CanonDC];
3397 if (Index < Previous.size() && Previous[Index])
3398 return Previous[Index];
3399
3400 // If this is the first time, but we have parsed a declaration of the context,
3401 // build the anonymous declaration list from the parsed declaration.
3402 auto *PrimaryDC = getPrimaryDCForAnonymousDecl(DC);
3403 if (PrimaryDC && !cast<Decl>(PrimaryDC)->isFromASTFile()) {
3404 numberAnonymousDeclsWithin(PrimaryDC, [&](NamedDecl *ND, unsigned Number) {
3405 if (Previous.size() == Number)
3406 Previous.push_back(cast<NamedDecl>(ND->getCanonicalDecl()));
3407 else
3408 Previous[Number] = cast<NamedDecl>(ND->getCanonicalDecl());
3409 });
3410 }
3411
3412 return Index < Previous.size() ? Previous[Index] : nullptr;
3413 }
3414
setAnonymousDeclForMerging(ASTReader & Reader,DeclContext * DC,unsigned Index,NamedDecl * D)3415 void ASTDeclReader::setAnonymousDeclForMerging(ASTReader &Reader,
3416 DeclContext *DC, unsigned Index,
3417 NamedDecl *D) {
3418 auto *CanonDC = cast<Decl>(DC)->getCanonicalDecl();
3419
3420 auto &Previous = Reader.AnonymousDeclarationsForMerging[CanonDC];
3421 if (Index >= Previous.size())
3422 Previous.resize(Index + 1);
3423 if (!Previous[Index])
3424 Previous[Index] = D;
3425 }
3426
findExisting(NamedDecl * D)3427 ASTDeclReader::FindExistingResult ASTDeclReader::findExisting(NamedDecl *D) {
3428 DeclarationName Name = TypedefNameForLinkage ? TypedefNameForLinkage
3429 : D->getDeclName();
3430
3431 if (!Name && !needsAnonymousDeclarationNumber(D)) {
3432 // Don't bother trying to find unnamed declarations that are in
3433 // unmergeable contexts.
3434 FindExistingResult Result(Reader, D, /*Existing=*/nullptr,
3435 AnonymousDeclNumber, TypedefNameForLinkage);
3436 Result.suppress();
3437 return Result;
3438 }
3439
3440 DeclContext *DC = D->getDeclContext()->getRedeclContext();
3441 if (TypedefNameForLinkage) {
3442 auto It = Reader.ImportedTypedefNamesForLinkage.find(
3443 std::make_pair(DC, TypedefNameForLinkage));
3444 if (It != Reader.ImportedTypedefNamesForLinkage.end())
3445 if (isSameEntity(It->second, D))
3446 return FindExistingResult(Reader, D, It->second, AnonymousDeclNumber,
3447 TypedefNameForLinkage);
3448 // Go on to check in other places in case an existing typedef name
3449 // was not imported.
3450 }
3451
3452 if (needsAnonymousDeclarationNumber(D)) {
3453 // This is an anonymous declaration that we may need to merge. Look it up
3454 // in its context by number.
3455 if (auto *Existing = getAnonymousDeclForMerging(
3456 Reader, D->getLexicalDeclContext(), AnonymousDeclNumber))
3457 if (isSameEntity(Existing, D))
3458 return FindExistingResult(Reader, D, Existing, AnonymousDeclNumber,
3459 TypedefNameForLinkage);
3460 } else if (DC->isTranslationUnit() &&
3461 !Reader.getContext().getLangOpts().CPlusPlus) {
3462 IdentifierResolver &IdResolver = Reader.getIdResolver();
3463
3464 // Temporarily consider the identifier to be up-to-date. We don't want to
3465 // cause additional lookups here.
3466 class UpToDateIdentifierRAII {
3467 IdentifierInfo *II;
3468 bool WasOutToDate = false;
3469
3470 public:
3471 explicit UpToDateIdentifierRAII(IdentifierInfo *II) : II(II) {
3472 if (II) {
3473 WasOutToDate = II->isOutOfDate();
3474 if (WasOutToDate)
3475 II->setOutOfDate(false);
3476 }
3477 }
3478
3479 ~UpToDateIdentifierRAII() {
3480 if (WasOutToDate)
3481 II->setOutOfDate(true);
3482 }
3483 } UpToDate(Name.getAsIdentifierInfo());
3484
3485 for (IdentifierResolver::iterator I = IdResolver.begin(Name),
3486 IEnd = IdResolver.end();
3487 I != IEnd; ++I) {
3488 if (NamedDecl *Existing = getDeclForMerging(*I, TypedefNameForLinkage))
3489 if (isSameEntity(Existing, D))
3490 return FindExistingResult(Reader, D, Existing, AnonymousDeclNumber,
3491 TypedefNameForLinkage);
3492 }
3493 } else if (DeclContext *MergeDC = getPrimaryContextForMerging(Reader, DC)) {
3494 DeclContext::lookup_result R = MergeDC->noload_lookup(Name);
3495 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; ++I) {
3496 if (NamedDecl *Existing = getDeclForMerging(*I, TypedefNameForLinkage))
3497 if (isSameEntity(Existing, D))
3498 return FindExistingResult(Reader, D, Existing, AnonymousDeclNumber,
3499 TypedefNameForLinkage);
3500 }
3501 } else {
3502 // Not in a mergeable context.
3503 return FindExistingResult(Reader);
3504 }
3505
3506 // If this declaration is from a merged context, make a note that we need to
3507 // check that the canonical definition of that context contains the decl.
3508 //
3509 // FIXME: We should do something similar if we merge two definitions of the
3510 // same template specialization into the same CXXRecordDecl.
3511 auto MergedDCIt = Reader.MergedDeclContexts.find(D->getLexicalDeclContext());
3512 if (MergedDCIt != Reader.MergedDeclContexts.end() &&
3513 MergedDCIt->second == D->getDeclContext())
3514 Reader.PendingOdrMergeChecks.push_back(D);
3515
3516 return FindExistingResult(Reader, D, /*Existing=*/nullptr,
3517 AnonymousDeclNumber, TypedefNameForLinkage);
3518 }
3519
3520 template<typename DeclT>
getMostRecentDeclImpl(Redeclarable<DeclT> * D)3521 Decl *ASTDeclReader::getMostRecentDeclImpl(Redeclarable<DeclT> *D) {
3522 return D->RedeclLink.getLatestNotUpdated();
3523 }
3524
getMostRecentDeclImpl(...)3525 Decl *ASTDeclReader::getMostRecentDeclImpl(...) {
3526 llvm_unreachable("getMostRecentDecl on non-redeclarable declaration");
3527 }
3528
getMostRecentDecl(Decl * D)3529 Decl *ASTDeclReader::getMostRecentDecl(Decl *D) {
3530 assert(D);
3531
3532 switch (D->getKind()) {
3533 #define ABSTRACT_DECL(TYPE)
3534 #define DECL(TYPE, BASE) \
3535 case Decl::TYPE: \
3536 return getMostRecentDeclImpl(cast<TYPE##Decl>(D));
3537 #include "clang/AST/DeclNodes.inc"
3538 }
3539 llvm_unreachable("unknown decl kind");
3540 }
3541
getMostRecentExistingDecl(Decl * D)3542 Decl *ASTReader::getMostRecentExistingDecl(Decl *D) {
3543 return ASTDeclReader::getMostRecentDecl(D->getCanonicalDecl());
3544 }
3545
3546 template<typename DeclT>
attachPreviousDeclImpl(ASTReader & Reader,Redeclarable<DeclT> * D,Decl * Previous,Decl * Canon)3547 void ASTDeclReader::attachPreviousDeclImpl(ASTReader &Reader,
3548 Redeclarable<DeclT> *D,
3549 Decl *Previous, Decl *Canon) {
3550 D->RedeclLink.setPrevious(cast<DeclT>(Previous));
3551 D->First = cast<DeclT>(Previous)->First;
3552 }
3553
3554 namespace clang {
3555
3556 template<>
attachPreviousDeclImpl(ASTReader & Reader,Redeclarable<VarDecl> * D,Decl * Previous,Decl * Canon)3557 void ASTDeclReader::attachPreviousDeclImpl(ASTReader &Reader,
3558 Redeclarable<VarDecl> *D,
3559 Decl *Previous, Decl *Canon) {
3560 auto *VD = static_cast<VarDecl *>(D);
3561 auto *PrevVD = cast<VarDecl>(Previous);
3562 D->RedeclLink.setPrevious(PrevVD);
3563 D->First = PrevVD->First;
3564
3565 // We should keep at most one definition on the chain.
3566 // FIXME: Cache the definition once we've found it. Building a chain with
3567 // N definitions currently takes O(N^2) time here.
3568 if (VD->isThisDeclarationADefinition() == VarDecl::Definition) {
3569 for (VarDecl *CurD = PrevVD; CurD; CurD = CurD->getPreviousDecl()) {
3570 if (CurD->isThisDeclarationADefinition() == VarDecl::Definition) {
3571 Reader.mergeDefinitionVisibility(CurD, VD);
3572 VD->demoteThisDefinitionToDeclaration();
3573 break;
3574 }
3575 }
3576 }
3577 }
3578
isUndeducedReturnType(QualType T)3579 static bool isUndeducedReturnType(QualType T) {
3580 auto *DT = T->getContainedDeducedType();
3581 return DT && !DT->isDeduced();
3582 }
3583
3584 template<>
attachPreviousDeclImpl(ASTReader & Reader,Redeclarable<FunctionDecl> * D,Decl * Previous,Decl * Canon)3585 void ASTDeclReader::attachPreviousDeclImpl(ASTReader &Reader,
3586 Redeclarable<FunctionDecl> *D,
3587 Decl *Previous, Decl *Canon) {
3588 auto *FD = static_cast<FunctionDecl *>(D);
3589 auto *PrevFD = cast<FunctionDecl>(Previous);
3590
3591 FD->RedeclLink.setPrevious(PrevFD);
3592 FD->First = PrevFD->First;
3593
3594 // If the previous declaration is an inline function declaration, then this
3595 // declaration is too.
3596 if (PrevFD->isInlined() != FD->isInlined()) {
3597 // FIXME: [dcl.fct.spec]p4:
3598 // If a function with external linkage is declared inline in one
3599 // translation unit, it shall be declared inline in all translation
3600 // units in which it appears.
3601 //
3602 // Be careful of this case:
3603 //
3604 // module A:
3605 // template<typename T> struct X { void f(); };
3606 // template<typename T> inline void X<T>::f() {}
3607 //
3608 // module B instantiates the declaration of X<int>::f
3609 // module C instantiates the definition of X<int>::f
3610 //
3611 // If module B and C are merged, we do not have a violation of this rule.
3612 FD->setImplicitlyInline(true);
3613 }
3614
3615 auto *FPT = FD->getType()->getAs<FunctionProtoType>();
3616 auto *PrevFPT = PrevFD->getType()->getAs<FunctionProtoType>();
3617 if (FPT && PrevFPT) {
3618 // If we need to propagate an exception specification along the redecl
3619 // chain, make a note of that so that we can do so later.
3620 bool IsUnresolved = isUnresolvedExceptionSpec(FPT->getExceptionSpecType());
3621 bool WasUnresolved =
3622 isUnresolvedExceptionSpec(PrevFPT->getExceptionSpecType());
3623 if (IsUnresolved != WasUnresolved)
3624 Reader.PendingExceptionSpecUpdates.insert(
3625 {Canon, IsUnresolved ? PrevFD : FD});
3626
3627 // If we need to propagate a deduced return type along the redecl chain,
3628 // make a note of that so that we can do it later.
3629 bool IsUndeduced = isUndeducedReturnType(FPT->getReturnType());
3630 bool WasUndeduced = isUndeducedReturnType(PrevFPT->getReturnType());
3631 if (IsUndeduced != WasUndeduced)
3632 Reader.PendingDeducedTypeUpdates.insert(
3633 {cast<FunctionDecl>(Canon),
3634 (IsUndeduced ? PrevFPT : FPT)->getReturnType()});
3635 }
3636 }
3637
3638 } // namespace clang
3639
attachPreviousDeclImpl(ASTReader & Reader,...)3640 void ASTDeclReader::attachPreviousDeclImpl(ASTReader &Reader, ...) {
3641 llvm_unreachable("attachPreviousDecl on non-redeclarable declaration");
3642 }
3643
3644 /// Inherit the default template argument from \p From to \p To. Returns
3645 /// \c false if there is no default template for \p From.
3646 template <typename ParmDecl>
inheritDefaultTemplateArgument(ASTContext & Context,ParmDecl * From,Decl * ToD)3647 static bool inheritDefaultTemplateArgument(ASTContext &Context, ParmDecl *From,
3648 Decl *ToD) {
3649 auto *To = cast<ParmDecl>(ToD);
3650 if (!From->hasDefaultArgument())
3651 return false;
3652 To->setInheritedDefaultArgument(Context, From);
3653 return true;
3654 }
3655
inheritDefaultTemplateArguments(ASTContext & Context,TemplateDecl * From,TemplateDecl * To)3656 static void inheritDefaultTemplateArguments(ASTContext &Context,
3657 TemplateDecl *From,
3658 TemplateDecl *To) {
3659 auto *FromTP = From->getTemplateParameters();
3660 auto *ToTP = To->getTemplateParameters();
3661 assert(FromTP->size() == ToTP->size() && "merged mismatched templates?");
3662
3663 for (unsigned I = 0, N = FromTP->size(); I != N; ++I) {
3664 NamedDecl *FromParam = FromTP->getParam(I);
3665 NamedDecl *ToParam = ToTP->getParam(I);
3666
3667 if (auto *FTTP = dyn_cast<TemplateTypeParmDecl>(FromParam))
3668 inheritDefaultTemplateArgument(Context, FTTP, ToParam);
3669 else if (auto *FNTTP = dyn_cast<NonTypeTemplateParmDecl>(FromParam))
3670 inheritDefaultTemplateArgument(Context, FNTTP, ToParam);
3671 else
3672 inheritDefaultTemplateArgument(
3673 Context, cast<TemplateTemplateParmDecl>(FromParam), ToParam);
3674 }
3675 }
3676
attachPreviousDecl(ASTReader & Reader,Decl * D,Decl * Previous,Decl * Canon)3677 void ASTDeclReader::attachPreviousDecl(ASTReader &Reader, Decl *D,
3678 Decl *Previous, Decl *Canon) {
3679 assert(D && Previous);
3680
3681 switch (D->getKind()) {
3682 #define ABSTRACT_DECL(TYPE)
3683 #define DECL(TYPE, BASE) \
3684 case Decl::TYPE: \
3685 attachPreviousDeclImpl(Reader, cast<TYPE##Decl>(D), Previous, Canon); \
3686 break;
3687 #include "clang/AST/DeclNodes.inc"
3688 }
3689
3690 // If the declaration was visible in one module, a redeclaration of it in
3691 // another module remains visible even if it wouldn't be visible by itself.
3692 //
3693 // FIXME: In this case, the declaration should only be visible if a module
3694 // that makes it visible has been imported.
3695 D->IdentifierNamespace |=
3696 Previous->IdentifierNamespace &
3697 (Decl::IDNS_Ordinary | Decl::IDNS_Tag | Decl::IDNS_Type);
3698
3699 // If the declaration declares a template, it may inherit default arguments
3700 // from the previous declaration.
3701 if (auto *TD = dyn_cast<TemplateDecl>(D))
3702 inheritDefaultTemplateArguments(Reader.getContext(),
3703 cast<TemplateDecl>(Previous), TD);
3704 }
3705
3706 template<typename DeclT>
attachLatestDeclImpl(Redeclarable<DeclT> * D,Decl * Latest)3707 void ASTDeclReader::attachLatestDeclImpl(Redeclarable<DeclT> *D, Decl *Latest) {
3708 D->RedeclLink.setLatest(cast<DeclT>(Latest));
3709 }
3710
attachLatestDeclImpl(...)3711 void ASTDeclReader::attachLatestDeclImpl(...) {
3712 llvm_unreachable("attachLatestDecl on non-redeclarable declaration");
3713 }
3714
attachLatestDecl(Decl * D,Decl * Latest)3715 void ASTDeclReader::attachLatestDecl(Decl *D, Decl *Latest) {
3716 assert(D && Latest);
3717
3718 switch (D->getKind()) {
3719 #define ABSTRACT_DECL(TYPE)
3720 #define DECL(TYPE, BASE) \
3721 case Decl::TYPE: \
3722 attachLatestDeclImpl(cast<TYPE##Decl>(D), Latest); \
3723 break;
3724 #include "clang/AST/DeclNodes.inc"
3725 }
3726 }
3727
3728 template<typename DeclT>
markIncompleteDeclChainImpl(Redeclarable<DeclT> * D)3729 void ASTDeclReader::markIncompleteDeclChainImpl(Redeclarable<DeclT> *D) {
3730 D->RedeclLink.markIncomplete();
3731 }
3732
markIncompleteDeclChainImpl(...)3733 void ASTDeclReader::markIncompleteDeclChainImpl(...) {
3734 llvm_unreachable("markIncompleteDeclChain on non-redeclarable declaration");
3735 }
3736
markIncompleteDeclChain(Decl * D)3737 void ASTReader::markIncompleteDeclChain(Decl *D) {
3738 switch (D->getKind()) {
3739 #define ABSTRACT_DECL(TYPE)
3740 #define DECL(TYPE, BASE) \
3741 case Decl::TYPE: \
3742 ASTDeclReader::markIncompleteDeclChainImpl(cast<TYPE##Decl>(D)); \
3743 break;
3744 #include "clang/AST/DeclNodes.inc"
3745 }
3746 }
3747
3748 /// Read the declaration at the given offset from the AST file.
ReadDeclRecord(DeclID ID)3749 Decl *ASTReader::ReadDeclRecord(DeclID ID) {
3750 unsigned Index = ID - NUM_PREDEF_DECL_IDS;
3751 SourceLocation DeclLoc;
3752 RecordLocation Loc = DeclCursorForID(ID, DeclLoc);
3753 llvm::BitstreamCursor &DeclsCursor = Loc.F->DeclsCursor;
3754 // Keep track of where we are in the stream, then jump back there
3755 // after reading this declaration.
3756 SavedStreamPosition SavedPosition(DeclsCursor);
3757
3758 ReadingKindTracker ReadingKind(Read_Decl, *this);
3759
3760 // Note that we are loading a declaration record.
3761 Deserializing ADecl(this);
3762
3763 auto Fail = [](const char *what, llvm::Error &&Err) {
3764 llvm::report_fatal_error(Twine("ASTReader::readDeclRecord failed ") + what +
3765 ": " + toString(std::move(Err)));
3766 };
3767
3768 if (llvm::Error JumpFailed = DeclsCursor.JumpToBit(Loc.Offset))
3769 Fail("jumping", std::move(JumpFailed));
3770 ASTRecordReader Record(*this, *Loc.F);
3771 ASTDeclReader Reader(*this, Record, Loc, ID, DeclLoc);
3772 Expected<unsigned> MaybeCode = DeclsCursor.ReadCode();
3773 if (!MaybeCode)
3774 Fail("reading code", MaybeCode.takeError());
3775 unsigned Code = MaybeCode.get();
3776
3777 ASTContext &Context = getContext();
3778 Decl *D = nullptr;
3779 Expected<unsigned> MaybeDeclCode = Record.readRecord(DeclsCursor, Code);
3780 if (!MaybeDeclCode)
3781 llvm::report_fatal_error(
3782 "ASTReader::readDeclRecord failed reading decl code: " +
3783 toString(MaybeDeclCode.takeError()));
3784 switch ((DeclCode)MaybeDeclCode.get()) {
3785 case DECL_CONTEXT_LEXICAL:
3786 case DECL_CONTEXT_VISIBLE:
3787 llvm_unreachable("Record cannot be de-serialized with readDeclRecord");
3788 case DECL_TYPEDEF:
3789 D = TypedefDecl::CreateDeserialized(Context, ID);
3790 break;
3791 case DECL_TYPEALIAS:
3792 D = TypeAliasDecl::CreateDeserialized(Context, ID);
3793 break;
3794 case DECL_ENUM:
3795 D = EnumDecl::CreateDeserialized(Context, ID);
3796 break;
3797 case DECL_RECORD:
3798 D = RecordDecl::CreateDeserialized(Context, ID);
3799 break;
3800 case DECL_ENUM_CONSTANT:
3801 D = EnumConstantDecl::CreateDeserialized(Context, ID);
3802 break;
3803 case DECL_FUNCTION:
3804 D = FunctionDecl::CreateDeserialized(Context, ID);
3805 break;
3806 case DECL_LINKAGE_SPEC:
3807 D = LinkageSpecDecl::CreateDeserialized(Context, ID);
3808 break;
3809 case DECL_EXPORT:
3810 D = ExportDecl::CreateDeserialized(Context, ID);
3811 break;
3812 case DECL_LABEL:
3813 D = LabelDecl::CreateDeserialized(Context, ID);
3814 break;
3815 case DECL_NAMESPACE:
3816 D = NamespaceDecl::CreateDeserialized(Context, ID);
3817 break;
3818 case DECL_NAMESPACE_ALIAS:
3819 D = NamespaceAliasDecl::CreateDeserialized(Context, ID);
3820 break;
3821 case DECL_USING:
3822 D = UsingDecl::CreateDeserialized(Context, ID);
3823 break;
3824 case DECL_USING_PACK:
3825 D = UsingPackDecl::CreateDeserialized(Context, ID, Record.readInt());
3826 break;
3827 case DECL_USING_SHADOW:
3828 D = UsingShadowDecl::CreateDeserialized(Context, ID);
3829 break;
3830 case DECL_CONSTRUCTOR_USING_SHADOW:
3831 D = ConstructorUsingShadowDecl::CreateDeserialized(Context, ID);
3832 break;
3833 case DECL_USING_DIRECTIVE:
3834 D = UsingDirectiveDecl::CreateDeserialized(Context, ID);
3835 break;
3836 case DECL_UNRESOLVED_USING_VALUE:
3837 D = UnresolvedUsingValueDecl::CreateDeserialized(Context, ID);
3838 break;
3839 case DECL_UNRESOLVED_USING_TYPENAME:
3840 D = UnresolvedUsingTypenameDecl::CreateDeserialized(Context, ID);
3841 break;
3842 case DECL_CXX_RECORD:
3843 D = CXXRecordDecl::CreateDeserialized(Context, ID);
3844 break;
3845 case DECL_CXX_DEDUCTION_GUIDE:
3846 D = CXXDeductionGuideDecl::CreateDeserialized(Context, ID);
3847 break;
3848 case DECL_CXX_METHOD:
3849 D = CXXMethodDecl::CreateDeserialized(Context, ID);
3850 break;
3851 case DECL_CXX_CONSTRUCTOR:
3852 D = CXXConstructorDecl::CreateDeserialized(Context, ID, Record.readInt());
3853 break;
3854 case DECL_CXX_DESTRUCTOR:
3855 D = CXXDestructorDecl::CreateDeserialized(Context, ID);
3856 break;
3857 case DECL_CXX_CONVERSION:
3858 D = CXXConversionDecl::CreateDeserialized(Context, ID);
3859 break;
3860 case DECL_ACCESS_SPEC:
3861 D = AccessSpecDecl::CreateDeserialized(Context, ID);
3862 break;
3863 case DECL_FRIEND:
3864 D = FriendDecl::CreateDeserialized(Context, ID, Record.readInt());
3865 break;
3866 case DECL_FRIEND_TEMPLATE:
3867 D = FriendTemplateDecl::CreateDeserialized(Context, ID);
3868 break;
3869 case DECL_CLASS_TEMPLATE:
3870 D = ClassTemplateDecl::CreateDeserialized(Context, ID);
3871 break;
3872 case DECL_CLASS_TEMPLATE_SPECIALIZATION:
3873 D = ClassTemplateSpecializationDecl::CreateDeserialized(Context, ID);
3874 break;
3875 case DECL_CLASS_TEMPLATE_PARTIAL_SPECIALIZATION:
3876 D = ClassTemplatePartialSpecializationDecl::CreateDeserialized(Context, ID);
3877 break;
3878 case DECL_VAR_TEMPLATE:
3879 D = VarTemplateDecl::CreateDeserialized(Context, ID);
3880 break;
3881 case DECL_VAR_TEMPLATE_SPECIALIZATION:
3882 D = VarTemplateSpecializationDecl::CreateDeserialized(Context, ID);
3883 break;
3884 case DECL_VAR_TEMPLATE_PARTIAL_SPECIALIZATION:
3885 D = VarTemplatePartialSpecializationDecl::CreateDeserialized(Context, ID);
3886 break;
3887 case DECL_CLASS_SCOPE_FUNCTION_SPECIALIZATION:
3888 D = ClassScopeFunctionSpecializationDecl::CreateDeserialized(Context, ID);
3889 break;
3890 case DECL_FUNCTION_TEMPLATE:
3891 D = FunctionTemplateDecl::CreateDeserialized(Context, ID);
3892 break;
3893 case DECL_TEMPLATE_TYPE_PARM: {
3894 bool HasTypeConstraint = Record.readInt();
3895 D = TemplateTypeParmDecl::CreateDeserialized(Context, ID,
3896 HasTypeConstraint);
3897 break;
3898 }
3899 case DECL_NON_TYPE_TEMPLATE_PARM: {
3900 bool HasTypeConstraint = Record.readInt();
3901 D = NonTypeTemplateParmDecl::CreateDeserialized(Context, ID,
3902 HasTypeConstraint);
3903 break;
3904 }
3905 case DECL_EXPANDED_NON_TYPE_TEMPLATE_PARM_PACK: {
3906 bool HasTypeConstraint = Record.readInt();
3907 D = NonTypeTemplateParmDecl::CreateDeserialized(Context, ID,
3908 Record.readInt(),
3909 HasTypeConstraint);
3910 break;
3911 }
3912 case DECL_TEMPLATE_TEMPLATE_PARM:
3913 D = TemplateTemplateParmDecl::CreateDeserialized(Context, ID);
3914 break;
3915 case DECL_EXPANDED_TEMPLATE_TEMPLATE_PARM_PACK:
3916 D = TemplateTemplateParmDecl::CreateDeserialized(Context, ID,
3917 Record.readInt());
3918 break;
3919 case DECL_TYPE_ALIAS_TEMPLATE:
3920 D = TypeAliasTemplateDecl::CreateDeserialized(Context, ID);
3921 break;
3922 case DECL_CONCEPT:
3923 D = ConceptDecl::CreateDeserialized(Context, ID);
3924 break;
3925 case DECL_REQUIRES_EXPR_BODY:
3926 D = RequiresExprBodyDecl::CreateDeserialized(Context, ID);
3927 break;
3928 case DECL_STATIC_ASSERT:
3929 D = StaticAssertDecl::CreateDeserialized(Context, ID);
3930 break;
3931 case DECL_OBJC_METHOD:
3932 D = ObjCMethodDecl::CreateDeserialized(Context, ID);
3933 break;
3934 case DECL_OBJC_INTERFACE:
3935 D = ObjCInterfaceDecl::CreateDeserialized(Context, ID);
3936 break;
3937 case DECL_OBJC_IVAR:
3938 D = ObjCIvarDecl::CreateDeserialized(Context, ID);
3939 break;
3940 case DECL_OBJC_PROTOCOL:
3941 D = ObjCProtocolDecl::CreateDeserialized(Context, ID);
3942 break;
3943 case DECL_OBJC_AT_DEFS_FIELD:
3944 D = ObjCAtDefsFieldDecl::CreateDeserialized(Context, ID);
3945 break;
3946 case DECL_OBJC_CATEGORY:
3947 D = ObjCCategoryDecl::CreateDeserialized(Context, ID);
3948 break;
3949 case DECL_OBJC_CATEGORY_IMPL:
3950 D = ObjCCategoryImplDecl::CreateDeserialized(Context, ID);
3951 break;
3952 case DECL_OBJC_IMPLEMENTATION:
3953 D = ObjCImplementationDecl::CreateDeserialized(Context, ID);
3954 break;
3955 case DECL_OBJC_COMPATIBLE_ALIAS:
3956 D = ObjCCompatibleAliasDecl::CreateDeserialized(Context, ID);
3957 break;
3958 case DECL_OBJC_PROPERTY:
3959 D = ObjCPropertyDecl::CreateDeserialized(Context, ID);
3960 break;
3961 case DECL_OBJC_PROPERTY_IMPL:
3962 D = ObjCPropertyImplDecl::CreateDeserialized(Context, ID);
3963 break;
3964 case DECL_FIELD:
3965 D = FieldDecl::CreateDeserialized(Context, ID);
3966 break;
3967 case DECL_INDIRECTFIELD:
3968 D = IndirectFieldDecl::CreateDeserialized(Context, ID);
3969 break;
3970 case DECL_VAR:
3971 D = VarDecl::CreateDeserialized(Context, ID);
3972 break;
3973 case DECL_IMPLICIT_PARAM:
3974 D = ImplicitParamDecl::CreateDeserialized(Context, ID);
3975 break;
3976 case DECL_PARM_VAR:
3977 D = ParmVarDecl::CreateDeserialized(Context, ID);
3978 break;
3979 case DECL_DECOMPOSITION:
3980 D = DecompositionDecl::CreateDeserialized(Context, ID, Record.readInt());
3981 break;
3982 case DECL_BINDING:
3983 D = BindingDecl::CreateDeserialized(Context, ID);
3984 break;
3985 case DECL_FILE_SCOPE_ASM:
3986 D = FileScopeAsmDecl::CreateDeserialized(Context, ID);
3987 break;
3988 case DECL_BLOCK:
3989 D = BlockDecl::CreateDeserialized(Context, ID);
3990 break;
3991 case DECL_MS_PROPERTY:
3992 D = MSPropertyDecl::CreateDeserialized(Context, ID);
3993 break;
3994 case DECL_MS_GUID:
3995 D = MSGuidDecl::CreateDeserialized(Context, ID);
3996 break;
3997 case DECL_CAPTURED:
3998 D = CapturedDecl::CreateDeserialized(Context, ID, Record.readInt());
3999 break;
4000 case DECL_CXX_BASE_SPECIFIERS:
4001 Error("attempt to read a C++ base-specifier record as a declaration");
4002 return nullptr;
4003 case DECL_CXX_CTOR_INITIALIZERS:
4004 Error("attempt to read a C++ ctor initializer record as a declaration");
4005 return nullptr;
4006 case DECL_IMPORT:
4007 // Note: last entry of the ImportDecl record is the number of stored source
4008 // locations.
4009 D = ImportDecl::CreateDeserialized(Context, ID, Record.back());
4010 break;
4011 case DECL_OMP_THREADPRIVATE:
4012 D = OMPThreadPrivateDecl::CreateDeserialized(Context, ID, Record.readInt());
4013 break;
4014 case DECL_OMP_ALLOCATE: {
4015 unsigned NumVars = Record.readInt();
4016 unsigned NumClauses = Record.readInt();
4017 D = OMPAllocateDecl::CreateDeserialized(Context, ID, NumVars, NumClauses);
4018 break;
4019 }
4020 case DECL_OMP_REQUIRES:
4021 D = OMPRequiresDecl::CreateDeserialized(Context, ID, Record.readInt());
4022 break;
4023 case DECL_OMP_DECLARE_REDUCTION:
4024 D = OMPDeclareReductionDecl::CreateDeserialized(Context, ID);
4025 break;
4026 case DECL_OMP_DECLARE_MAPPER:
4027 D = OMPDeclareMapperDecl::CreateDeserialized(Context, ID, Record.readInt());
4028 break;
4029 case DECL_OMP_CAPTUREDEXPR:
4030 D = OMPCapturedExprDecl::CreateDeserialized(Context, ID);
4031 break;
4032 case DECL_PRAGMA_COMMENT:
4033 D = PragmaCommentDecl::CreateDeserialized(Context, ID, Record.readInt());
4034 break;
4035 case DECL_PRAGMA_DETECT_MISMATCH:
4036 D = PragmaDetectMismatchDecl::CreateDeserialized(Context, ID,
4037 Record.readInt());
4038 break;
4039 case DECL_EMPTY:
4040 D = EmptyDecl::CreateDeserialized(Context, ID);
4041 break;
4042 case DECL_LIFETIME_EXTENDED_TEMPORARY:
4043 D = LifetimeExtendedTemporaryDecl::CreateDeserialized(Context, ID);
4044 break;
4045 case DECL_OBJC_TYPE_PARAM:
4046 D = ObjCTypeParamDecl::CreateDeserialized(Context, ID);
4047 break;
4048 }
4049
4050 assert(D && "Unknown declaration reading AST file");
4051 LoadedDecl(Index, D);
4052 // Set the DeclContext before doing any deserialization, to make sure internal
4053 // calls to Decl::getASTContext() by Decl's methods will find the
4054 // TranslationUnitDecl without crashing.
4055 D->setDeclContext(Context.getTranslationUnitDecl());
4056 Reader.Visit(D);
4057
4058 // If this declaration is also a declaration context, get the
4059 // offsets for its tables of lexical and visible declarations.
4060 if (auto *DC = dyn_cast<DeclContext>(D)) {
4061 std::pair<uint64_t, uint64_t> Offsets = Reader.VisitDeclContext(DC);
4062 if (Offsets.first &&
4063 ReadLexicalDeclContextStorage(*Loc.F, DeclsCursor, Offsets.first, DC))
4064 return nullptr;
4065 if (Offsets.second &&
4066 ReadVisibleDeclContextStorage(*Loc.F, DeclsCursor, Offsets.second, ID))
4067 return nullptr;
4068 }
4069 assert(Record.getIdx() == Record.size());
4070
4071 // Load any relevant update records.
4072 PendingUpdateRecords.push_back(
4073 PendingUpdateRecord(ID, D, /*JustLoaded=*/true));
4074
4075 // Load the categories after recursive loading is finished.
4076 if (auto *Class = dyn_cast<ObjCInterfaceDecl>(D))
4077 // If we already have a definition when deserializing the ObjCInterfaceDecl,
4078 // we put the Decl in PendingDefinitions so we can pull the categories here.
4079 if (Class->isThisDeclarationADefinition() ||
4080 PendingDefinitions.count(Class))
4081 loadObjCCategories(ID, Class);
4082
4083 // If we have deserialized a declaration that has a definition the
4084 // AST consumer might need to know about, queue it.
4085 // We don't pass it to the consumer immediately because we may be in recursive
4086 // loading, and some declarations may still be initializing.
4087 PotentiallyInterestingDecls.push_back(
4088 InterestingDecl(D, Reader.hasPendingBody()));
4089
4090 return D;
4091 }
4092
PassInterestingDeclsToConsumer()4093 void ASTReader::PassInterestingDeclsToConsumer() {
4094 assert(Consumer);
4095
4096 if (PassingDeclsToConsumer)
4097 return;
4098
4099 // Guard variable to avoid recursively redoing the process of passing
4100 // decls to consumer.
4101 SaveAndRestore<bool> GuardPassingDeclsToConsumer(PassingDeclsToConsumer,
4102 true);
4103
4104 // Ensure that we've loaded all potentially-interesting declarations
4105 // that need to be eagerly loaded.
4106 for (auto ID : EagerlyDeserializedDecls)
4107 GetDecl(ID);
4108 EagerlyDeserializedDecls.clear();
4109
4110 while (!PotentiallyInterestingDecls.empty()) {
4111 InterestingDecl D = PotentiallyInterestingDecls.front();
4112 PotentiallyInterestingDecls.pop_front();
4113 if (isConsumerInterestedIn(getContext(), D.getDecl(), D.hasPendingBody()))
4114 PassInterestingDeclToConsumer(D.getDecl());
4115 }
4116 }
4117
loadDeclUpdateRecords(PendingUpdateRecord & Record)4118 void ASTReader::loadDeclUpdateRecords(PendingUpdateRecord &Record) {
4119 // The declaration may have been modified by files later in the chain.
4120 // If this is the case, read the record containing the updates from each file
4121 // and pass it to ASTDeclReader to make the modifications.
4122 serialization::GlobalDeclID ID = Record.ID;
4123 Decl *D = Record.D;
4124 ProcessingUpdatesRAIIObj ProcessingUpdates(*this);
4125 DeclUpdateOffsetsMap::iterator UpdI = DeclUpdateOffsets.find(ID);
4126
4127 SmallVector<serialization::DeclID, 8> PendingLazySpecializationIDs;
4128
4129 if (UpdI != DeclUpdateOffsets.end()) {
4130 auto UpdateOffsets = std::move(UpdI->second);
4131 DeclUpdateOffsets.erase(UpdI);
4132
4133 // Check if this decl was interesting to the consumer. If we just loaded
4134 // the declaration, then we know it was interesting and we skip the call
4135 // to isConsumerInterestedIn because it is unsafe to call in the
4136 // current ASTReader state.
4137 bool WasInteresting =
4138 Record.JustLoaded || isConsumerInterestedIn(getContext(), D, false);
4139 for (auto &FileAndOffset : UpdateOffsets) {
4140 ModuleFile *F = FileAndOffset.first;
4141 uint64_t Offset = FileAndOffset.second;
4142 llvm::BitstreamCursor &Cursor = F->DeclsCursor;
4143 SavedStreamPosition SavedPosition(Cursor);
4144 if (llvm::Error JumpFailed = Cursor.JumpToBit(Offset))
4145 // FIXME don't do a fatal error.
4146 llvm::report_fatal_error(
4147 "ASTReader::loadDeclUpdateRecords failed jumping: " +
4148 toString(std::move(JumpFailed)));
4149 Expected<unsigned> MaybeCode = Cursor.ReadCode();
4150 if (!MaybeCode)
4151 llvm::report_fatal_error(
4152 "ASTReader::loadDeclUpdateRecords failed reading code: " +
4153 toString(MaybeCode.takeError()));
4154 unsigned Code = MaybeCode.get();
4155 ASTRecordReader Record(*this, *F);
4156 if (Expected<unsigned> MaybeRecCode = Record.readRecord(Cursor, Code))
4157 assert(MaybeRecCode.get() == DECL_UPDATES &&
4158 "Expected DECL_UPDATES record!");
4159 else
4160 llvm::report_fatal_error(
4161 "ASTReader::loadDeclUpdateRecords failed reading rec code: " +
4162 toString(MaybeCode.takeError()));
4163
4164 ASTDeclReader Reader(*this, Record, RecordLocation(F, Offset), ID,
4165 SourceLocation());
4166 Reader.UpdateDecl(D, PendingLazySpecializationIDs);
4167
4168 // We might have made this declaration interesting. If so, remember that
4169 // we need to hand it off to the consumer.
4170 if (!WasInteresting &&
4171 isConsumerInterestedIn(getContext(), D, Reader.hasPendingBody())) {
4172 PotentiallyInterestingDecls.push_back(
4173 InterestingDecl(D, Reader.hasPendingBody()));
4174 WasInteresting = true;
4175 }
4176 }
4177 }
4178 // Add the lazy specializations to the template.
4179 assert((PendingLazySpecializationIDs.empty() || isa<ClassTemplateDecl>(D) ||
4180 isa<FunctionTemplateDecl>(D) || isa<VarTemplateDecl>(D)) &&
4181 "Must not have pending specializations");
4182 if (auto *CTD = dyn_cast<ClassTemplateDecl>(D))
4183 ASTDeclReader::AddLazySpecializations(CTD, PendingLazySpecializationIDs);
4184 else if (auto *FTD = dyn_cast<FunctionTemplateDecl>(D))
4185 ASTDeclReader::AddLazySpecializations(FTD, PendingLazySpecializationIDs);
4186 else if (auto *VTD = dyn_cast<VarTemplateDecl>(D))
4187 ASTDeclReader::AddLazySpecializations(VTD, PendingLazySpecializationIDs);
4188 PendingLazySpecializationIDs.clear();
4189
4190 // Load the pending visible updates for this decl context, if it has any.
4191 auto I = PendingVisibleUpdates.find(ID);
4192 if (I != PendingVisibleUpdates.end()) {
4193 auto VisibleUpdates = std::move(I->second);
4194 PendingVisibleUpdates.erase(I);
4195
4196 auto *DC = cast<DeclContext>(D)->getPrimaryContext();
4197 for (const auto &Update : VisibleUpdates)
4198 Lookups[DC].Table.add(
4199 Update.Mod, Update.Data,
4200 reader::ASTDeclContextNameLookupTrait(*this, *Update.Mod));
4201 DC->setHasExternalVisibleStorage(true);
4202 }
4203 }
4204
loadPendingDeclChain(Decl * FirstLocal,uint64_t LocalOffset)4205 void ASTReader::loadPendingDeclChain(Decl *FirstLocal, uint64_t LocalOffset) {
4206 // Attach FirstLocal to the end of the decl chain.
4207 Decl *CanonDecl = FirstLocal->getCanonicalDecl();
4208 if (FirstLocal != CanonDecl) {
4209 Decl *PrevMostRecent = ASTDeclReader::getMostRecentDecl(CanonDecl);
4210 ASTDeclReader::attachPreviousDecl(
4211 *this, FirstLocal, PrevMostRecent ? PrevMostRecent : CanonDecl,
4212 CanonDecl);
4213 }
4214
4215 if (!LocalOffset) {
4216 ASTDeclReader::attachLatestDecl(CanonDecl, FirstLocal);
4217 return;
4218 }
4219
4220 // Load the list of other redeclarations from this module file.
4221 ModuleFile *M = getOwningModuleFile(FirstLocal);
4222 assert(M && "imported decl from no module file");
4223
4224 llvm::BitstreamCursor &Cursor = M->DeclsCursor;
4225 SavedStreamPosition SavedPosition(Cursor);
4226 if (llvm::Error JumpFailed = Cursor.JumpToBit(LocalOffset))
4227 llvm::report_fatal_error(
4228 "ASTReader::loadPendingDeclChain failed jumping: " +
4229 toString(std::move(JumpFailed)));
4230
4231 RecordData Record;
4232 Expected<unsigned> MaybeCode = Cursor.ReadCode();
4233 if (!MaybeCode)
4234 llvm::report_fatal_error(
4235 "ASTReader::loadPendingDeclChain failed reading code: " +
4236 toString(MaybeCode.takeError()));
4237 unsigned Code = MaybeCode.get();
4238 if (Expected<unsigned> MaybeRecCode = Cursor.readRecord(Code, Record))
4239 assert(MaybeRecCode.get() == LOCAL_REDECLARATIONS &&
4240 "expected LOCAL_REDECLARATIONS record!");
4241 else
4242 llvm::report_fatal_error(
4243 "ASTReader::loadPendingDeclChain failed reading rec code: " +
4244 toString(MaybeCode.takeError()));
4245
4246 // FIXME: We have several different dispatches on decl kind here; maybe
4247 // we should instead generate one loop per kind and dispatch up-front?
4248 Decl *MostRecent = FirstLocal;
4249 for (unsigned I = 0, N = Record.size(); I != N; ++I) {
4250 auto *D = GetLocalDecl(*M, Record[N - I - 1]);
4251 ASTDeclReader::attachPreviousDecl(*this, D, MostRecent, CanonDecl);
4252 MostRecent = D;
4253 }
4254 ASTDeclReader::attachLatestDecl(CanonDecl, MostRecent);
4255 }
4256
4257 namespace {
4258
4259 /// Given an ObjC interface, goes through the modules and links to the
4260 /// interface all the categories for it.
4261 class ObjCCategoriesVisitor {
4262 ASTReader &Reader;
4263 ObjCInterfaceDecl *Interface;
4264 llvm::SmallPtrSetImpl<ObjCCategoryDecl *> &Deserialized;
4265 ObjCCategoryDecl *Tail = nullptr;
4266 llvm::DenseMap<DeclarationName, ObjCCategoryDecl *> NameCategoryMap;
4267 serialization::GlobalDeclID InterfaceID;
4268 unsigned PreviousGeneration;
4269
add(ObjCCategoryDecl * Cat)4270 void add(ObjCCategoryDecl *Cat) {
4271 // Only process each category once.
4272 if (!Deserialized.erase(Cat))
4273 return;
4274
4275 // Check for duplicate categories.
4276 if (Cat->getDeclName()) {
4277 ObjCCategoryDecl *&Existing = NameCategoryMap[Cat->getDeclName()];
4278 if (Existing &&
4279 Reader.getOwningModuleFile(Existing)
4280 != Reader.getOwningModuleFile(Cat)) {
4281 // FIXME: We should not warn for duplicates in diamond:
4282 //
4283 // MT //
4284 // / \ //
4285 // ML MR //
4286 // \ / //
4287 // MB //
4288 //
4289 // If there are duplicates in ML/MR, there will be warning when
4290 // creating MB *and* when importing MB. We should not warn when
4291 // importing.
4292 Reader.Diag(Cat->getLocation(), diag::warn_dup_category_def)
4293 << Interface->getDeclName() << Cat->getDeclName();
4294 Reader.Diag(Existing->getLocation(), diag::note_previous_definition);
4295 } else if (!Existing) {
4296 // Record this category.
4297 Existing = Cat;
4298 }
4299 }
4300
4301 // Add this category to the end of the chain.
4302 if (Tail)
4303 ASTDeclReader::setNextObjCCategory(Tail, Cat);
4304 else
4305 Interface->setCategoryListRaw(Cat);
4306 Tail = Cat;
4307 }
4308
4309 public:
ObjCCategoriesVisitor(ASTReader & Reader,ObjCInterfaceDecl * Interface,llvm::SmallPtrSetImpl<ObjCCategoryDecl * > & Deserialized,serialization::GlobalDeclID InterfaceID,unsigned PreviousGeneration)4310 ObjCCategoriesVisitor(ASTReader &Reader,
4311 ObjCInterfaceDecl *Interface,
4312 llvm::SmallPtrSetImpl<ObjCCategoryDecl *> &Deserialized,
4313 serialization::GlobalDeclID InterfaceID,
4314 unsigned PreviousGeneration)
4315 : Reader(Reader), Interface(Interface), Deserialized(Deserialized),
4316 InterfaceID(InterfaceID), PreviousGeneration(PreviousGeneration) {
4317 // Populate the name -> category map with the set of known categories.
4318 for (auto *Cat : Interface->known_categories()) {
4319 if (Cat->getDeclName())
4320 NameCategoryMap[Cat->getDeclName()] = Cat;
4321
4322 // Keep track of the tail of the category list.
4323 Tail = Cat;
4324 }
4325 }
4326
operator ()(ModuleFile & M)4327 bool operator()(ModuleFile &M) {
4328 // If we've loaded all of the category information we care about from
4329 // this module file, we're done.
4330 if (M.Generation <= PreviousGeneration)
4331 return true;
4332
4333 // Map global ID of the definition down to the local ID used in this
4334 // module file. If there is no such mapping, we'll find nothing here
4335 // (or in any module it imports).
4336 DeclID LocalID = Reader.mapGlobalIDToModuleFileGlobalID(M, InterfaceID);
4337 if (!LocalID)
4338 return true;
4339
4340 // Perform a binary search to find the local redeclarations for this
4341 // declaration (if any).
4342 const ObjCCategoriesInfo Compare = { LocalID, 0 };
4343 const ObjCCategoriesInfo *Result
4344 = std::lower_bound(M.ObjCCategoriesMap,
4345 M.ObjCCategoriesMap + M.LocalNumObjCCategoriesInMap,
4346 Compare);
4347 if (Result == M.ObjCCategoriesMap + M.LocalNumObjCCategoriesInMap ||
4348 Result->DefinitionID != LocalID) {
4349 // We didn't find anything. If the class definition is in this module
4350 // file, then the module files it depends on cannot have any categories,
4351 // so suppress further lookup.
4352 return Reader.isDeclIDFromModule(InterfaceID, M);
4353 }
4354
4355 // We found something. Dig out all of the categories.
4356 unsigned Offset = Result->Offset;
4357 unsigned N = M.ObjCCategories[Offset];
4358 M.ObjCCategories[Offset++] = 0; // Don't try to deserialize again
4359 for (unsigned I = 0; I != N; ++I)
4360 add(cast_or_null<ObjCCategoryDecl>(
4361 Reader.GetLocalDecl(M, M.ObjCCategories[Offset++])));
4362 return true;
4363 }
4364 };
4365
4366 } // namespace
4367
loadObjCCategories(serialization::GlobalDeclID ID,ObjCInterfaceDecl * D,unsigned PreviousGeneration)4368 void ASTReader::loadObjCCategories(serialization::GlobalDeclID ID,
4369 ObjCInterfaceDecl *D,
4370 unsigned PreviousGeneration) {
4371 ObjCCategoriesVisitor Visitor(*this, D, CategoriesDeserialized, ID,
4372 PreviousGeneration);
4373 ModuleMgr.visit(Visitor);
4374 }
4375
4376 template<typename DeclT, typename Fn>
forAllLaterRedecls(DeclT * D,Fn F)4377 static void forAllLaterRedecls(DeclT *D, Fn F) {
4378 F(D);
4379
4380 // Check whether we've already merged D into its redeclaration chain.
4381 // MostRecent may or may not be nullptr if D has not been merged. If
4382 // not, walk the merged redecl chain and see if it's there.
4383 auto *MostRecent = D->getMostRecentDecl();
4384 bool Found = false;
4385 for (auto *Redecl = MostRecent; Redecl && !Found;
4386 Redecl = Redecl->getPreviousDecl())
4387 Found = (Redecl == D);
4388
4389 // If this declaration is merged, apply the functor to all later decls.
4390 if (Found) {
4391 for (auto *Redecl = MostRecent; Redecl != D;
4392 Redecl = Redecl->getPreviousDecl())
4393 F(Redecl);
4394 }
4395 }
4396
UpdateDecl(Decl * D,llvm::SmallVectorImpl<serialization::DeclID> & PendingLazySpecializationIDs)4397 void ASTDeclReader::UpdateDecl(Decl *D,
4398 llvm::SmallVectorImpl<serialization::DeclID> &PendingLazySpecializationIDs) {
4399 while (Record.getIdx() < Record.size()) {
4400 switch ((DeclUpdateKind)Record.readInt()) {
4401 case UPD_CXX_ADDED_IMPLICIT_MEMBER: {
4402 auto *RD = cast<CXXRecordDecl>(D);
4403 // FIXME: If we also have an update record for instantiating the
4404 // definition of D, we need that to happen before we get here.
4405 Decl *MD = Record.readDecl();
4406 assert(MD && "couldn't read decl from update record");
4407 // FIXME: We should call addHiddenDecl instead, to add the member
4408 // to its DeclContext.
4409 RD->addedMember(MD);
4410 break;
4411 }
4412
4413 case UPD_CXX_ADDED_TEMPLATE_SPECIALIZATION:
4414 // It will be added to the template's lazy specialization set.
4415 PendingLazySpecializationIDs.push_back(readDeclID());
4416 break;
4417
4418 case UPD_CXX_ADDED_ANONYMOUS_NAMESPACE: {
4419 auto *Anon = readDeclAs<NamespaceDecl>();
4420
4421 // Each module has its own anonymous namespace, which is disjoint from
4422 // any other module's anonymous namespaces, so don't attach the anonymous
4423 // namespace at all.
4424 if (!Record.isModule()) {
4425 if (auto *TU = dyn_cast<TranslationUnitDecl>(D))
4426 TU->setAnonymousNamespace(Anon);
4427 else
4428 cast<NamespaceDecl>(D)->setAnonymousNamespace(Anon);
4429 }
4430 break;
4431 }
4432
4433 case UPD_CXX_ADDED_VAR_DEFINITION: {
4434 auto *VD = cast<VarDecl>(D);
4435 VD->NonParmVarDeclBits.IsInline = Record.readInt();
4436 VD->NonParmVarDeclBits.IsInlineSpecified = Record.readInt();
4437 uint64_t Val = Record.readInt();
4438 if (Val && !VD->getInit()) {
4439 VD->setInit(Record.readExpr());
4440 if (Val > 1) { // IsInitKnownICE = 1, IsInitNotICE = 2, IsInitICE = 3
4441 EvaluatedStmt *Eval = VD->ensureEvaluatedStmt();
4442 Eval->CheckedICE = true;
4443 Eval->IsICE = Val == 3;
4444 }
4445 }
4446 break;
4447 }
4448
4449 case UPD_CXX_POINT_OF_INSTANTIATION: {
4450 SourceLocation POI = Record.readSourceLocation();
4451 if (auto *VTSD = dyn_cast<VarTemplateSpecializationDecl>(D)) {
4452 VTSD->setPointOfInstantiation(POI);
4453 } else if (auto *VD = dyn_cast<VarDecl>(D)) {
4454 VD->getMemberSpecializationInfo()->setPointOfInstantiation(POI);
4455 } else {
4456 auto *FD = cast<FunctionDecl>(D);
4457 if (auto *FTSInfo = FD->TemplateOrSpecialization
4458 .dyn_cast<FunctionTemplateSpecializationInfo *>())
4459 FTSInfo->setPointOfInstantiation(POI);
4460 else
4461 FD->TemplateOrSpecialization.get<MemberSpecializationInfo *>()
4462 ->setPointOfInstantiation(POI);
4463 }
4464 break;
4465 }
4466
4467 case UPD_CXX_INSTANTIATED_DEFAULT_ARGUMENT: {
4468 auto *Param = cast<ParmVarDecl>(D);
4469
4470 // We have to read the default argument regardless of whether we use it
4471 // so that hypothetical further update records aren't messed up.
4472 // TODO: Add a function to skip over the next expr record.
4473 auto *DefaultArg = Record.readExpr();
4474
4475 // Only apply the update if the parameter still has an uninstantiated
4476 // default argument.
4477 if (Param->hasUninstantiatedDefaultArg())
4478 Param->setDefaultArg(DefaultArg);
4479 break;
4480 }
4481
4482 case UPD_CXX_INSTANTIATED_DEFAULT_MEMBER_INITIALIZER: {
4483 auto *FD = cast<FieldDecl>(D);
4484 auto *DefaultInit = Record.readExpr();
4485
4486 // Only apply the update if the field still has an uninstantiated
4487 // default member initializer.
4488 if (FD->hasInClassInitializer() && !FD->getInClassInitializer()) {
4489 if (DefaultInit)
4490 FD->setInClassInitializer(DefaultInit);
4491 else
4492 // Instantiation failed. We can get here if we serialized an AST for
4493 // an invalid program.
4494 FD->removeInClassInitializer();
4495 }
4496 break;
4497 }
4498
4499 case UPD_CXX_ADDED_FUNCTION_DEFINITION: {
4500 auto *FD = cast<FunctionDecl>(D);
4501 if (Reader.PendingBodies[FD]) {
4502 // FIXME: Maybe check for ODR violations.
4503 // It's safe to stop now because this update record is always last.
4504 return;
4505 }
4506
4507 if (Record.readInt()) {
4508 // Maintain AST consistency: any later redeclarations of this function
4509 // are inline if this one is. (We might have merged another declaration
4510 // into this one.)
4511 forAllLaterRedecls(FD, [](FunctionDecl *FD) {
4512 FD->setImplicitlyInline();
4513 });
4514 }
4515 FD->setInnerLocStart(readSourceLocation());
4516 ReadFunctionDefinition(FD);
4517 assert(Record.getIdx() == Record.size() && "lazy body must be last");
4518 break;
4519 }
4520
4521 case UPD_CXX_INSTANTIATED_CLASS_DEFINITION: {
4522 auto *RD = cast<CXXRecordDecl>(D);
4523 auto *OldDD = RD->getCanonicalDecl()->DefinitionData;
4524 bool HadRealDefinition =
4525 OldDD && (OldDD->Definition != RD ||
4526 !Reader.PendingFakeDefinitionData.count(OldDD));
4527 RD->setParamDestroyedInCallee(Record.readInt());
4528 RD->setArgPassingRestrictions(
4529 (RecordDecl::ArgPassingKind)Record.readInt());
4530 ReadCXXRecordDefinition(RD, /*Update*/true);
4531
4532 // Visible update is handled separately.
4533 uint64_t LexicalOffset = ReadLocalOffset();
4534 if (!HadRealDefinition && LexicalOffset) {
4535 Record.readLexicalDeclContextStorage(LexicalOffset, RD);
4536 Reader.PendingFakeDefinitionData.erase(OldDD);
4537 }
4538
4539 auto TSK = (TemplateSpecializationKind)Record.readInt();
4540 SourceLocation POI = readSourceLocation();
4541 if (MemberSpecializationInfo *MSInfo =
4542 RD->getMemberSpecializationInfo()) {
4543 MSInfo->setTemplateSpecializationKind(TSK);
4544 MSInfo->setPointOfInstantiation(POI);
4545 } else {
4546 auto *Spec = cast<ClassTemplateSpecializationDecl>(RD);
4547 Spec->setTemplateSpecializationKind(TSK);
4548 Spec->setPointOfInstantiation(POI);
4549
4550 if (Record.readInt()) {
4551 auto *PartialSpec =
4552 readDeclAs<ClassTemplatePartialSpecializationDecl>();
4553 SmallVector<TemplateArgument, 8> TemplArgs;
4554 Record.readTemplateArgumentList(TemplArgs);
4555 auto *TemplArgList = TemplateArgumentList::CreateCopy(
4556 Reader.getContext(), TemplArgs);
4557
4558 // FIXME: If we already have a partial specialization set,
4559 // check that it matches.
4560 if (!Spec->getSpecializedTemplateOrPartial()
4561 .is<ClassTemplatePartialSpecializationDecl *>())
4562 Spec->setInstantiationOf(PartialSpec, TemplArgList);
4563 }
4564 }
4565
4566 RD->setTagKind((TagTypeKind)Record.readInt());
4567 RD->setLocation(readSourceLocation());
4568 RD->setLocStart(readSourceLocation());
4569 RD->setBraceRange(readSourceRange());
4570
4571 if (Record.readInt()) {
4572 AttrVec Attrs;
4573 Record.readAttributes(Attrs);
4574 // If the declaration already has attributes, we assume that some other
4575 // AST file already loaded them.
4576 if (!D->hasAttrs())
4577 D->setAttrsImpl(Attrs, Reader.getContext());
4578 }
4579 break;
4580 }
4581
4582 case UPD_CXX_RESOLVED_DTOR_DELETE: {
4583 // Set the 'operator delete' directly to avoid emitting another update
4584 // record.
4585 auto *Del = readDeclAs<FunctionDecl>();
4586 auto *First = cast<CXXDestructorDecl>(D->getCanonicalDecl());
4587 auto *ThisArg = Record.readExpr();
4588 // FIXME: Check consistency if we have an old and new operator delete.
4589 if (!First->OperatorDelete) {
4590 First->OperatorDelete = Del;
4591 First->OperatorDeleteThisArg = ThisArg;
4592 }
4593 break;
4594 }
4595
4596 case UPD_CXX_RESOLVED_EXCEPTION_SPEC: {
4597 SmallVector<QualType, 8> ExceptionStorage;
4598 auto ESI = Record.readExceptionSpecInfo(ExceptionStorage);
4599
4600 // Update this declaration's exception specification, if needed.
4601 auto *FD = cast<FunctionDecl>(D);
4602 auto *FPT = FD->getType()->castAs<FunctionProtoType>();
4603 // FIXME: If the exception specification is already present, check that it
4604 // matches.
4605 if (isUnresolvedExceptionSpec(FPT->getExceptionSpecType())) {
4606 FD->setType(Reader.getContext().getFunctionType(
4607 FPT->getReturnType(), FPT->getParamTypes(),
4608 FPT->getExtProtoInfo().withExceptionSpec(ESI)));
4609
4610 // When we get to the end of deserializing, see if there are other decls
4611 // that we need to propagate this exception specification onto.
4612 Reader.PendingExceptionSpecUpdates.insert(
4613 std::make_pair(FD->getCanonicalDecl(), FD));
4614 }
4615 break;
4616 }
4617
4618 case UPD_CXX_DEDUCED_RETURN_TYPE: {
4619 auto *FD = cast<FunctionDecl>(D);
4620 QualType DeducedResultType = Record.readType();
4621 Reader.PendingDeducedTypeUpdates.insert(
4622 {FD->getCanonicalDecl(), DeducedResultType});
4623 break;
4624 }
4625
4626 case UPD_DECL_MARKED_USED:
4627 // Maintain AST consistency: any later redeclarations are used too.
4628 D->markUsed(Reader.getContext());
4629 break;
4630
4631 case UPD_MANGLING_NUMBER:
4632 Reader.getContext().setManglingNumber(cast<NamedDecl>(D),
4633 Record.readInt());
4634 break;
4635
4636 case UPD_STATIC_LOCAL_NUMBER:
4637 Reader.getContext().setStaticLocalNumber(cast<VarDecl>(D),
4638 Record.readInt());
4639 break;
4640
4641 case UPD_DECL_MARKED_OPENMP_THREADPRIVATE:
4642 D->addAttr(OMPThreadPrivateDeclAttr::CreateImplicit(
4643 Reader.getContext(), readSourceRange(),
4644 AttributeCommonInfo::AS_Pragma));
4645 break;
4646
4647 case UPD_DECL_MARKED_OPENMP_ALLOCATE: {
4648 auto AllocatorKind =
4649 static_cast<OMPAllocateDeclAttr::AllocatorTypeTy>(Record.readInt());
4650 Expr *Allocator = Record.readExpr();
4651 SourceRange SR = readSourceRange();
4652 D->addAttr(OMPAllocateDeclAttr::CreateImplicit(
4653 Reader.getContext(), AllocatorKind, Allocator, SR,
4654 AttributeCommonInfo::AS_Pragma));
4655 break;
4656 }
4657
4658 case UPD_DECL_EXPORTED: {
4659 unsigned SubmoduleID = readSubmoduleID();
4660 auto *Exported = cast<NamedDecl>(D);
4661 Module *Owner = SubmoduleID ? Reader.getSubmodule(SubmoduleID) : nullptr;
4662 Reader.getContext().mergeDefinitionIntoModule(Exported, Owner);
4663 Reader.PendingMergedDefinitionsToDeduplicate.insert(Exported);
4664 break;
4665 }
4666
4667 case UPD_DECL_MARKED_OPENMP_DECLARETARGET: {
4668 OMPDeclareTargetDeclAttr::MapTypeTy MapType =
4669 static_cast<OMPDeclareTargetDeclAttr::MapTypeTy>(Record.readInt());
4670 OMPDeclareTargetDeclAttr::DevTypeTy DevType =
4671 static_cast<OMPDeclareTargetDeclAttr::DevTypeTy>(Record.readInt());
4672 D->addAttr(OMPDeclareTargetDeclAttr::CreateImplicit(
4673 Reader.getContext(), MapType, DevType, readSourceRange(),
4674 AttributeCommonInfo::AS_Pragma));
4675 break;
4676 }
4677
4678 case UPD_ADDED_ATTR_TO_RECORD:
4679 AttrVec Attrs;
4680 Record.readAttributes(Attrs);
4681 assert(Attrs.size() == 1);
4682 D->addAttr(Attrs[0]);
4683 break;
4684 }
4685 }
4686 }
4687