[llvm-branch-commits] [clang] [Serialization] Code cleanups and polish 83233 (PR #83237)
Chuanqi Xu via llvm-branch-commits
llvm-branch-commits at lists.llvm.org
Wed Jul 10 02:53:21 PDT 2024
https://github.com/ChuanqiXu9 updated https://github.com/llvm/llvm-project/pull/83237
>From f2e53e44eebab4720a1dbade24fcb14d698fb03f Mon Sep 17 00:00:00 2001
From: Chuanqi Xu <yedeng.yd at linux.alibaba.com>
Date: Wed, 28 Feb 2024 11:41:53 +0800
Subject: [PATCH 1/2] [Serialization] Code cleanups and polish 83233
---
clang/include/clang/AST/DeclTemplate.h | 39 +-
clang/include/clang/AST/ExternalASTSource.h | 8 +-
.../clang/Sema/MultiplexExternalSemaSource.h | 4 +-
.../include/clang/Serialization/ASTBitCodes.h | 2 +-
clang/include/clang/Serialization/ASTReader.h | 4 +-
clang/lib/AST/DeclTemplate.cpp | 85 ++--
clang/lib/AST/ExternalASTSource.cpp | 10 +-
clang/lib/AST/ODRHash.cpp | 10 -
.../lib/Sema/MultiplexExternalSemaSource.cpp | 13 +-
clang/lib/Serialization/ASTCommon.h | 1 -
clang/lib/Serialization/ASTReader.cpp | 42 +-
clang/lib/Serialization/ASTReaderDecl.cpp | 76 +---
clang/lib/Serialization/ASTReaderInternals.h | 1 -
clang/lib/Serialization/ASTWriter.cpp | 27 +-
clang/lib/Serialization/ASTWriterDecl.cpp | 52 +--
clang/lib/Serialization/CMakeLists.txt | 1 +
.../Serialization/TemplateArgumentHasher.cpp | 423 ++++++++++++++++++
.../Serialization/TemplateArgumentHasher.h | 34 ++
clang/test/Modules/cxx-templates.cpp | 8 +-
.../Modules/recursive-instantiations.cppm | 40 ++
.../test/OpenMP/target_parallel_ast_print.cpp | 4 -
clang/test/OpenMP/target_teams_ast_print.cpp | 4 -
clang/test/OpenMP/task_ast_print.cpp | 4 -
clang/test/OpenMP/teams_ast_print.cpp | 4 -
24 files changed, 610 insertions(+), 286 deletions(-)
create mode 100644 clang/lib/Serialization/TemplateArgumentHasher.cpp
create mode 100644 clang/lib/Serialization/TemplateArgumentHasher.h
create mode 100644 clang/test/Modules/recursive-instantiations.cppm
diff --git a/clang/include/clang/AST/DeclTemplate.h b/clang/include/clang/AST/DeclTemplate.h
index 44f840d297465..7406252363d22 100644
--- a/clang/include/clang/AST/DeclTemplate.h
+++ b/clang/include/clang/AST/DeclTemplate.h
@@ -256,9 +256,6 @@ class TemplateArgumentList final
TemplateArgumentList(const TemplateArgumentList &) = delete;
TemplateArgumentList &operator=(const TemplateArgumentList &) = delete;
- /// Create hash for the given arguments.
- static unsigned ComputeODRHash(ArrayRef<TemplateArgument> Args);
-
/// Create a new template argument list that copies the given set of
/// template arguments.
static TemplateArgumentList *CreateCopy(ASTContext &Context,
@@ -732,25 +729,6 @@ class RedeclarableTemplateDecl : public TemplateDecl,
}
void anchor() override;
- struct LazySpecializationInfo {
- GlobalDeclID DeclID = GlobalDeclID();
- unsigned ODRHash = ~0U;
- bool IsPartial = false;
- LazySpecializationInfo(GlobalDeclID ID, unsigned Hash = ~0U,
- bool Partial = false)
- : DeclID(ID), ODRHash(Hash), IsPartial(Partial) {}
- LazySpecializationInfo() {}
- bool operator<(const LazySpecializationInfo &Other) const {
- return DeclID < Other.DeclID;
- }
- bool operator==(const LazySpecializationInfo &Other) const {
- assert((DeclID != Other.DeclID || ODRHash == Other.ODRHash) &&
- "Hashes differ!");
- assert((DeclID != Other.DeclID || IsPartial == Other.IsPartial) &&
- "Both must be the same kinds!");
- return DeclID == Other.DeclID;
- }
- };
protected:
template <typename EntryType> struct SpecEntryTraits {
@@ -794,16 +772,20 @@ class RedeclarableTemplateDecl : public TemplateDecl,
void loadLazySpecializationsImpl(bool OnlyPartial = false) const;
- void loadLazySpecializationsImpl(llvm::ArrayRef<TemplateArgument> Args,
+ bool loadLazySpecializationsImpl(llvm::ArrayRef<TemplateArgument> Args,
TemplateParameterList *TPL = nullptr) const;
- Decl *loadLazySpecializationImpl(LazySpecializationInfo &LazySpecInfo) const;
-
template <class EntryType, typename ...ProfileArguments>
typename SpecEntryTraits<EntryType>::DeclType*
findSpecializationImpl(llvm::FoldingSetVector<EntryType> &Specs,
void *&InsertPos, ProfileArguments &&...ProfileArgs);
+ template <class EntryType, typename... ProfileArguments>
+ typename SpecEntryTraits<EntryType>::DeclType *
+ findSpecializationLocally(llvm::FoldingSetVector<EntryType> &Specs,
+ void *&InsertPos,
+ ProfileArguments &&...ProfileArgs);
+
template <class Derived, class EntryType>
void addSpecializationImpl(llvm::FoldingSetVector<EntryType> &Specs,
EntryType *Entry, void *InsertPos);
@@ -819,13 +801,6 @@ class RedeclarableTemplateDecl : public TemplateDecl,
llvm::PointerIntPair<RedeclarableTemplateDecl*, 1, bool>
InstantiatedFromMember;
- /// If non-null, points to an array of specializations (including
- /// partial specializations) known only by their external declaration IDs.
- ///
- /// The first value in the array is the number of specializations/partial
- /// specializations that follow.
- LazySpecializationInfo *LazySpecializations = nullptr;
-
/// The set of "injected" template arguments used within this
/// template.
///
diff --git a/clang/include/clang/AST/ExternalASTSource.h b/clang/include/clang/AST/ExternalASTSource.h
index 24c4490d160f3..2b73b543fabb3 100644
--- a/clang/include/clang/AST/ExternalASTSource.h
+++ b/clang/include/clang/AST/ExternalASTSource.h
@@ -153,11 +153,15 @@ class ExternalASTSource : public RefCountedBase<ExternalASTSource> {
/// Load all the external specializations for the Decl \param D if \param
/// OnlyPartial is false. Otherwise, load all the external **partial**
/// specializations for the \param D.
- virtual void LoadExternalSpecializations(const Decl *D, bool OnlyPartial);
+ ///
+ /// Return true if any new specializations get loaded. Return false otherwise.
+ virtual bool LoadExternalSpecializations(const Decl *D, bool OnlyPartial);
/// Load all the specializations for the Decl \param D with the same template
/// args specified by \param TemplateArgs.
- virtual void
+ ///
+ /// Return true if any new specializations get loaded. Return false otherwise.
+ virtual bool
LoadExternalSpecializations(const Decl *D,
ArrayRef<TemplateArgument> TemplateArgs);
diff --git a/clang/include/clang/Sema/MultiplexExternalSemaSource.h b/clang/include/clang/Sema/MultiplexExternalSemaSource.h
index f81b70daa4b3d..da13bef15de0e 100644
--- a/clang/include/clang/Sema/MultiplexExternalSemaSource.h
+++ b/clang/include/clang/Sema/MultiplexExternalSemaSource.h
@@ -97,9 +97,9 @@ class MultiplexExternalSemaSource : public ExternalSemaSource {
bool FindExternalVisibleDeclsByName(const DeclContext *DC,
DeclarationName Name) override;
- void LoadExternalSpecializations(const Decl *D, bool OnlyPartial) override;
+ bool LoadExternalSpecializations(const Decl *D, bool OnlyPartial) override;
- void
+ bool
LoadExternalSpecializations(const Decl *D,
ArrayRef<TemplateArgument> TemplateArgs) override;
diff --git a/clang/include/clang/Serialization/ASTBitCodes.h b/clang/include/clang/Serialization/ASTBitCodes.h
index eefc0e5218d7d..c7c1fdaf03ef4 100644
--- a/clang/include/clang/Serialization/ASTBitCodes.h
+++ b/clang/include/clang/Serialization/ASTBitCodes.h
@@ -726,7 +726,7 @@ enum ASTRecordTypes {
VTABLES_TO_EMIT = 70,
/// Record code for updated specialization
- UPDATE_SPECIALIZATION = 71,
+ CXX_ADDED_TEMPLATE_SPECIALIZATION = 71,
};
/// Record types used within a source manager block.
diff --git a/clang/include/clang/Serialization/ASTReader.h b/clang/include/clang/Serialization/ASTReader.h
index 0356fd14d9fd6..bb87998aba384 100644
--- a/clang/include/clang/Serialization/ASTReader.h
+++ b/clang/include/clang/Serialization/ASTReader.h
@@ -2008,9 +2008,9 @@ class ASTReader
unsigned BlockID,
uint64_t *StartOfBlockOffset = nullptr);
- void LoadExternalSpecializations(const Decl *D, bool OnlyPartial) override;
+ bool LoadExternalSpecializations(const Decl *D, bool OnlyPartial) override;
- void
+ bool
LoadExternalSpecializations(const Decl *D,
ArrayRef<TemplateArgument> TemplateArgs) override;
diff --git a/clang/lib/AST/DeclTemplate.cpp b/clang/lib/AST/DeclTemplate.cpp
index 1c81218626fdf..419b2e7c18e48 100644
--- a/clang/lib/AST/DeclTemplate.cpp
+++ b/clang/lib/AST/DeclTemplate.cpp
@@ -342,63 +342,30 @@ void RedeclarableTemplateDecl::loadLazySpecializationsImpl(
ExternalSource->LoadExternalSpecializations(this->getCanonicalDecl(),
OnlyPartial);
return;
-
- // Grab the most recent declaration to ensure we've loaded any lazy
- // redeclarations of this template.
- CommonBase *CommonBasePtr = getMostRecentDecl()->getCommonPtr();
- if (auto *Specs = CommonBasePtr->LazySpecializations) {
- if (!OnlyPartial)
- CommonBasePtr->LazySpecializations = nullptr;
- unsigned N = Specs[0].DeclID.getRawValue();
- for (unsigned I = 0; I != N; ++I) {
- // Skip over already loaded specializations.
- if (!Specs[I + 1].ODRHash)
- continue;
- if (!OnlyPartial || Specs[I + 1].IsPartial)
- (void)loadLazySpecializationImpl(Specs[I + 1]);
- }
- }
-}
-
-Decl *RedeclarableTemplateDecl::loadLazySpecializationImpl(
- LazySpecializationInfo &LazySpecInfo) const {
- llvm_unreachable("We don't use LazySpecializationInfo any more");
-
- GlobalDeclID ID = LazySpecInfo.DeclID;
- assert(ID.isValid() && "Loading already loaded specialization!");
- // Note that we loaded the specialization.
- LazySpecInfo.DeclID = GlobalDeclID();
- LazySpecInfo.ODRHash = LazySpecInfo.IsPartial = 0;
- return getASTContext().getExternalSource()->GetExternalDecl(ID);
}
-void RedeclarableTemplateDecl::loadLazySpecializationsImpl(
+bool RedeclarableTemplateDecl::loadLazySpecializationsImpl(
ArrayRef<TemplateArgument> Args, TemplateParameterList *TPL) const {
auto *ExternalSource = getASTContext().getExternalSource();
if (!ExternalSource)
- return;
+ return false;
- ExternalSource->LoadExternalSpecializations(this->getCanonicalDecl(), Args);
- return;
+ // If TPL is not null, it implies that we're loading specializations for
+ // partial templates. We need to load all specializations in such cases.
+ if (TPL)
+ return ExternalSource->LoadExternalSpecializations(this->getCanonicalDecl(),
+ /*OnlyPartial=*/false);
- CommonBase *CommonBasePtr = getMostRecentDecl()->getCommonPtr();
- if (auto *Specs = CommonBasePtr->LazySpecializations) {
- unsigned Hash = TemplateArgumentList::ComputeODRHash(Args);
- unsigned N = Specs[0].DeclID.getRawValue();
- for (unsigned I = 0; I != N; ++I)
- if (Specs[I+1].ODRHash && Specs[I+1].ODRHash == Hash)
- (void)loadLazySpecializationImpl(Specs[I+1]);
- }
+ return ExternalSource->LoadExternalSpecializations(this->getCanonicalDecl(),
+ Args);
}
-template<class EntryType, typename... ProfileArguments>
+template <class EntryType, typename... ProfileArguments>
typename RedeclarableTemplateDecl::SpecEntryTraits<EntryType>::DeclType *
-RedeclarableTemplateDecl::findSpecializationImpl(
+RedeclarableTemplateDecl::findSpecializationLocally(
llvm::FoldingSetVector<EntryType> &Specs, void *&InsertPos,
- ProfileArguments&&... ProfileArgs) {
- using SETraits = SpecEntryTraits<EntryType>;
-
- loadLazySpecializationsImpl(std::forward<ProfileArguments>(ProfileArgs)...);
+ ProfileArguments &&...ProfileArgs) {
+ using SETraits = RedeclarableTemplateDecl::SpecEntryTraits<EntryType>;
llvm::FoldingSetNodeID ID;
EntryType::Profile(ID, std::forward<ProfileArguments>(ProfileArgs)...,
@@ -407,6 +374,24 @@ RedeclarableTemplateDecl::findSpecializationImpl(
return Entry ? SETraits::getDecl(Entry)->getMostRecentDecl() : nullptr;
}
+template <class EntryType, typename... ProfileArguments>
+typename RedeclarableTemplateDecl::SpecEntryTraits<EntryType>::DeclType *
+RedeclarableTemplateDecl::findSpecializationImpl(
+ llvm::FoldingSetVector<EntryType> &Specs, void *&InsertPos,
+ ProfileArguments &&...ProfileArgs) {
+
+ if (auto *Found = findSpecializationLocally(
+ Specs, InsertPos, std::forward<ProfileArguments>(ProfileArgs)...))
+ return Found;
+
+ if (!loadLazySpecializationsImpl(
+ std::forward<ProfileArguments>(ProfileArgs)...))
+ return nullptr;
+
+ return findSpecializationLocally(
+ Specs, InsertPos, std::forward<ProfileArguments>(ProfileArgs)...);
+}
+
template<class Derived, class EntryType>
void RedeclarableTemplateDecl::addSpecializationImpl(
llvm::FoldingSetVector<EntryType> &Specializations, EntryType *Entry,
@@ -955,14 +940,6 @@ TemplateArgumentList::CreateCopy(ASTContext &Context,
return new (Mem) TemplateArgumentList(Args);
}
-unsigned TemplateArgumentList::ComputeODRHash(ArrayRef<TemplateArgument> Args) {
- ODRHash Hasher;
- for (TemplateArgument TA : Args)
- Hasher.AddTemplateArgument(TA);
-
- return Hasher.CalculateHash();
-}
-
FunctionTemplateSpecializationInfo *FunctionTemplateSpecializationInfo::Create(
ASTContext &C, FunctionDecl *FD, FunctionTemplateDecl *Template,
TemplateSpecializationKind TSK, TemplateArgumentList *TemplateArgs,
diff --git a/clang/lib/AST/ExternalASTSource.cpp b/clang/lib/AST/ExternalASTSource.cpp
index 122014bfeb232..0eeb549d8cabf 100644
--- a/clang/lib/AST/ExternalASTSource.cpp
+++ b/clang/lib/AST/ExternalASTSource.cpp
@@ -98,10 +98,14 @@ ExternalASTSource::FindExternalVisibleDeclsByName(const DeclContext *DC,
return false;
}
-void ExternalASTSource::LoadExternalSpecializations(const Decl *D, bool) {}
+bool ExternalASTSource::LoadExternalSpecializations(const Decl *D, bool) {
+ return false;
+}
-void ExternalASTSource::LoadExternalSpecializations(
- const Decl *D, ArrayRef<TemplateArgument>) {}
+bool ExternalASTSource::LoadExternalSpecializations(
+ const Decl *D, ArrayRef<TemplateArgument>) {
+ return false;
+}
void ExternalASTSource::completeVisibleDeclsMap(const DeclContext *DC) {}
diff --git a/clang/lib/AST/ODRHash.cpp b/clang/lib/AST/ODRHash.cpp
index 7b361c958c54f..8e91add1d5875 100644
--- a/clang/lib/AST/ODRHash.cpp
+++ b/clang/lib/AST/ODRHash.cpp
@@ -816,16 +816,6 @@ void ODRHash::AddDecl(const Decl *D) {
AddDeclarationName(ND->getDeclName());
- const auto *Specialization =
- dyn_cast<ClassTemplateSpecializationDecl>(D);
- AddBoolean(Specialization);
- if (Specialization) {
- const TemplateArgumentList &List = Specialization->getTemplateArgs();
- ID.AddInteger(List.size());
- for (const TemplateArgument &TA : List.asArray())
- AddTemplateArgument(TA);
- }
-
// If this was a specialization we should take into account its template
// arguments. This helps to reduce collisions coming when visiting template
// specialization types (eg. when processing type template arguments).
diff --git a/clang/lib/Sema/MultiplexExternalSemaSource.cpp b/clang/lib/Sema/MultiplexExternalSemaSource.cpp
index 8b1642cf88a12..2e98f7ef9519c 100644
--- a/clang/lib/Sema/MultiplexExternalSemaSource.cpp
+++ b/clang/lib/Sema/MultiplexExternalSemaSource.cpp
@@ -115,16 +115,21 @@ FindExternalVisibleDeclsByName(const DeclContext *DC, DeclarationName Name) {
return AnyDeclsFound;
}
-void MultiplexExternalSemaSource::LoadExternalSpecializations(
+bool MultiplexExternalSemaSource::LoadExternalSpecializations(
const Decl *D, bool OnlyPartial) {
+ bool Loaded = false;
for (size_t i = 0; i < Sources.size(); ++i)
- Sources[i]->LoadExternalSpecializations(D, OnlyPartial);
+ Loaded |= Sources[i]->LoadExternalSpecializations(D, OnlyPartial);
+ return Loaded;
}
-void MultiplexExternalSemaSource::LoadExternalSpecializations(
+bool MultiplexExternalSemaSource::LoadExternalSpecializations(
const Decl *D, ArrayRef<TemplateArgument> TemplateArgs) {
+ bool AnyNewSpecsLoaded = false;
for (size_t i = 0; i < Sources.size(); ++i)
- Sources[i]->LoadExternalSpecializations(D, TemplateArgs);
+ AnyNewSpecsLoaded |=
+ Sources[i]->LoadExternalSpecializations(D, TemplateArgs);
+ return AnyNewSpecsLoaded;
}
void MultiplexExternalSemaSource::completeVisibleDeclsMap(const DeclContext *DC){
diff --git a/clang/lib/Serialization/ASTCommon.h b/clang/lib/Serialization/ASTCommon.h
index 0230908d3e052..0cef55c53ffcb 100644
--- a/clang/lib/Serialization/ASTCommon.h
+++ b/clang/lib/Serialization/ASTCommon.h
@@ -23,7 +23,6 @@ namespace serialization {
enum DeclUpdateKind {
UPD_CXX_ADDED_IMPLICIT_MEMBER,
- UPD_CXX_ADDED_TEMPLATE_SPECIALIZATION,
UPD_CXX_ADDED_ANONYMOUS_NAMESPACE,
UPD_CXX_ADDED_FUNCTION_DEFINITION,
UPD_CXX_ADDED_VAR_DEFINITION,
diff --git a/clang/lib/Serialization/ASTReader.cpp b/clang/lib/Serialization/ASTReader.cpp
index 2a5216ab03634..f75d8fc4676b3 100644
--- a/clang/lib/Serialization/ASTReader.cpp
+++ b/clang/lib/Serialization/ASTReader.cpp
@@ -12,6 +12,7 @@
#include "ASTCommon.h"
#include "ASTReaderInternals.h"
+#include "TemplateArgumentHasher.h"
#include "clang/AST/ASTConsumer.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/ASTMutationListener.h"
@@ -3521,7 +3522,7 @@ llvm::Error ASTReader::ReadASTBlock(ModuleFile &F,
break;
}
- case UPDATE_SPECIALIZATION: {
+ case CXX_ADDED_TEMPLATE_SPECIALIZATION: {
unsigned Idx = 0;
GlobalDeclID ID = ReadDeclID(F, Record, Idx);
auto *Data = (const unsigned char *)Blob.data();
@@ -7694,8 +7695,13 @@ void ASTReader::CompleteRedeclChain(const Decl *D) {
}
}
- if (Template)
- Template->loadLazySpecializationsImpl(Args);
+ if (Template) {
+ // For partitial specialization, load all the specializations for safety.
+ if (isa<ClassTemplatePartialSpecializationDecl, VarTemplatePartialSpecializationDecl>(D))
+ Template->loadLazySpecializationsImpl();
+ else
+ Template->loadLazySpecializationsImpl(Args);
+ }
}
CXXCtorInitializer **
@@ -8011,12 +8017,12 @@ Stmt *ASTReader::GetExternalDeclStmt(uint64_t Offset) {
return ReadStmtFromStream(*Loc.F);
}
-void ASTReader::LoadExternalSpecializations(const Decl *D, bool OnlyPartial) {
+bool ASTReader::LoadExternalSpecializations(const Decl *D, bool OnlyPartial) {
assert(D);
auto It = SpecializationsLookups.find(D);
if (It == SpecializationsLookups.end())
- return;
+ return false;
// Get Decl may violate the iterator from SpecializationsLookups so we store
// the DeclIDs in ahead.
@@ -8027,30 +8033,44 @@ void ASTReader::LoadExternalSpecializations(const Decl *D, bool OnlyPartial) {
// the lookup table.
if (!OnlyPartial)
SpecializationsLookups.erase(It);
-
+
+ bool NewSpecsFound = false;
Deserializing LookupResults(this);
for (auto &Info : Infos)
- if (!OnlyPartial || Info.IsPartial)
+ if (!OnlyPartial || Info.IsPartial) {
+ if (GetExistingDecl(Info.ID))
+ continue;
+ NewSpecsFound = true;
GetDecl(Info.ID);
+ }
+
+ return NewSpecsFound;
}
-void ASTReader::LoadExternalSpecializations(
+bool ASTReader::LoadExternalSpecializations(
const Decl *D, ArrayRef<TemplateArgument> TemplateArgs) {
assert(D);
auto It = SpecializationsLookups.find(D);
if (It == SpecializationsLookups.end())
- return;
+ return false;
Deserializing LookupResults(this);
- auto HashValue = TemplateArgumentList::ComputeODRHash(TemplateArgs);
+ auto HashValue = StableHashForTemplateArguments(TemplateArgs);
// Get Decl may violate the iterator from SpecializationsLookups
llvm::SmallVector<serialization::reader::LazySpecializationInfo, 8> Infos =
It->second.Table.find(HashValue);
- for (auto &Info : Infos)
+ bool NewSpecsFound = false;
+ for (auto &Info : Infos) {
+ if (GetExistingDecl(Info.ID))
+ continue;
+ NewSpecsFound = true;
GetDecl(Info.ID);
+ }
+
+ return NewSpecsFound;
}
void ASTReader::FindExternalLexicalDecls(
diff --git a/clang/lib/Serialization/ASTReaderDecl.cpp b/clang/lib/Serialization/ASTReaderDecl.cpp
index 5c1ee02c561de..9fa07137daabe 100644
--- a/clang/lib/Serialization/ASTReaderDecl.cpp
+++ b/clang/lib/Serialization/ASTReaderDecl.cpp
@@ -89,8 +89,6 @@ namespace clang {
const SourceLocation ThisDeclLoc;
using RecordData = ASTReader::RecordData;
- using LazySpecializationInfo =
- RedeclarableTemplateDecl::LazySpecializationInfo;
TypeID DeferredTypeID = 0;
unsigned AnonymousDeclNumber = 0;
@@ -133,18 +131,6 @@ namespace clang {
return Record.readString();
}
- LazySpecializationInfo ReadLazySpecializationInfo() {
- GlobalDeclID ID = readDeclID();
- unsigned Hash = Record.readInt();
- bool IsPartial = Record.readInt();
- return LazySpecializationInfo(ID, Hash, IsPartial);
- }
-
- void readDeclIDList(SmallVectorImpl<LazySpecializationInfo> &IDs) {
- for (unsigned I = 0, Size = Record.readInt(); I != Size; ++I)
- IDs.push_back(ReadLazySpecializationInfo());
- }
-
Decl *readDecl() {
return Record.readDecl();
}
@@ -271,29 +257,6 @@ namespace clang {
: Reader(Reader), Record(Record), Loc(Loc), ThisDeclID(thisDeclID),
ThisDeclLoc(ThisDeclLoc) {}
- template <typename T>
- static void
- AddLazySpecializations(T *D, SmallVectorImpl<LazySpecializationInfo> &IDs) {
- if (IDs.empty())
- return;
-
- // FIXME: We should avoid this pattern of getting the ASTContext.
- ASTContext &C = D->getASTContext();
-
- auto *&LazySpecializations = D->getCommonPtr()->LazySpecializations;
-
- if (auto &Old = LazySpecializations) {
- IDs.insert(IDs.end(), Old + 1, Old + 1 + Old[0].DeclID.getRawValue());
- llvm::sort(IDs);
- IDs.erase(std::unique(IDs.begin(), IDs.end()), IDs.end());
- }
- auto *Result = new (C) LazySpecializationInfo[1 + IDs.size()];
- Result->DeclID = GlobalDeclID(IDs.size());
- std::copy(IDs.begin(), IDs.end(), Result + 1);
-
- LazySpecializations = Result;
- }
-
template <typename DeclT>
static Decl *getMostRecentDeclImpl(Redeclarable<DeclT> *D);
static Decl *getMostRecentDeclImpl(...);
@@ -322,7 +285,7 @@ namespace clang {
void ReadFunctionDefinition(FunctionDecl *FD);
void Visit(Decl *D);
- void UpdateDecl(Decl *D, llvm::SmallVectorImpl<LazySpecializationInfo> &);
+ void UpdateDecl(Decl *D);
static void setNextObjCCategory(ObjCCategoryDecl *Cat,
ObjCCategoryDecl *Next) {
@@ -2473,9 +2436,6 @@ void ASTDeclReader::VisitClassTemplateDecl(ClassTemplateDecl *D) {
if (ThisDeclID == Redecl.getFirstID()) {
// This ClassTemplateDecl owns a CommonPtr; read it to keep track of all of
// the specializations.
- SmallVector<LazySpecializationInfo, 32> SpecIDs;
- readDeclIDList(SpecIDs);
- ASTDeclReader::AddLazySpecializations(D, SpecIDs);
ReadSpecializations(*Loc.F, D, Loc.F->DeclsCursor);
}
@@ -2502,9 +2462,6 @@ void ASTDeclReader::VisitVarTemplateDecl(VarTemplateDecl *D) {
if (ThisDeclID == Redecl.getFirstID()) {
// This VarTemplateDecl owns a CommonPtr; read it to keep track of all of
// the specializations.
- SmallVector<LazySpecializationInfo, 32> SpecIDs;
- readDeclIDList(SpecIDs);
- ASTDeclReader::AddLazySpecializations(D, SpecIDs);
ReadSpecializations(*Loc.F, D, Loc.F->DeclsCursor);
}
}
@@ -2605,9 +2562,6 @@ void ASTDeclReader::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) {
if (ThisDeclID == Redecl.getFirstID()) {
// This FunctionTemplateDecl owns a CommonPtr; read it.
- SmallVector<LazySpecializationInfo, 32> SpecIDs;
- readDeclIDList(SpecIDs);
- ASTDeclReader::AddLazySpecializations(D, SpecIDs);
ReadSpecializations(*Loc.F, D, Loc.F->DeclsCursor);
}
}
@@ -4268,10 +4222,6 @@ void ASTReader::loadDeclUpdateRecords(PendingUpdateRecord &Record) {
ProcessingUpdatesRAIIObj ProcessingUpdates(*this);
DeclUpdateOffsetsMap::iterator UpdI = DeclUpdateOffsets.find(ID);
- using LazySpecializationInfo =
- RedeclarableTemplateDecl::LazySpecializationInfo;
- llvm::SmallVector<LazySpecializationInfo, 8> PendingLazySpecializationIDs;
-
if (UpdI != DeclUpdateOffsets.end()) {
auto UpdateOffsets = std::move(UpdI->second);
DeclUpdateOffsets.erase(UpdI);
@@ -4308,7 +4258,7 @@ void ASTReader::loadDeclUpdateRecords(PendingUpdateRecord &Record) {
ASTDeclReader Reader(*this, Record, RecordLocation(F, Offset), ID,
SourceLocation());
- Reader.UpdateDecl(D, PendingLazySpecializationIDs);
+ Reader.UpdateDecl(D);
// We might have made this declaration interesting. If so, remember that
// we need to hand it off to the consumer.
@@ -4318,19 +4268,6 @@ void ASTReader::loadDeclUpdateRecords(PendingUpdateRecord &Record) {
}
}
}
- // Add the lazy specializations to the template.
- assert((PendingLazySpecializationIDs.empty() || isa<ClassTemplateDecl>(D) ||
- isa<FunctionTemplateDecl, VarTemplateDecl>(D)) &&
- "Must not have pending specializations");
- /*
- if (auto *CTD = dyn_cast<ClassTemplateDecl>(D))
- ASTDeclReader::AddLazySpecializations(CTD, PendingLazySpecializationIDs);
- else if (auto *FTD = dyn_cast<FunctionTemplateDecl>(D))
- ASTDeclReader::AddLazySpecializations(FTD, PendingLazySpecializationIDs);
- else if (auto *VTD = dyn_cast<VarTemplateDecl>(D))
- ASTDeclReader::AddLazySpecializations(VTD, PendingLazySpecializationIDs);
- */
- PendingLazySpecializationIDs.clear();
// Load the pending visible updates for this decl context, if it has any.
auto I = PendingVisibleUpdates.find(ID);
@@ -4547,9 +4484,7 @@ static void forAllLaterRedecls(DeclT *D, Fn F) {
}
}
-void ASTDeclReader::UpdateDecl(
- Decl *D,
- SmallVectorImpl<LazySpecializationInfo> &PendingLazySpecializationIDs) {
+void ASTDeclReader::UpdateDecl(Decl *D) {
while (Record.getIdx() < Record.size()) {
switch ((DeclUpdateKind)Record.readInt()) {
case UPD_CXX_ADDED_IMPLICIT_MEMBER: {
@@ -4560,11 +4495,6 @@ void ASTDeclReader::UpdateDecl(
break;
}
- case UPD_CXX_ADDED_TEMPLATE_SPECIALIZATION:
- // It will be added to the template's lazy specialization set.
- PendingLazySpecializationIDs.push_back(ReadLazySpecializationInfo());
- break;
-
case UPD_CXX_ADDED_ANONYMOUS_NAMESPACE: {
auto *Anon = readDeclAs<NamespaceDecl>();
diff --git a/clang/lib/Serialization/ASTReaderInternals.h b/clang/lib/Serialization/ASTReaderInternals.h
index 43b8aa41f91a2..30bc8ead8b04f 100644
--- a/clang/lib/Serialization/ASTReaderInternals.h
+++ b/clang/lib/Serialization/ASTReaderInternals.h
@@ -129,7 +129,6 @@ struct LazySpecializationInfo {
assert(ID != Other.ID || IsPartial == Other.IsPartial);
return ID == Other.ID;
}
-
// Records the size record in OnDiskHashTable.
// sizeof() may return 8 due to align requirements.
static constexpr unsigned Length = sizeof(DeclID) + sizeof(IsPartial);
diff --git a/clang/lib/Serialization/ASTWriter.cpp b/clang/lib/Serialization/ASTWriter.cpp
index aed09cd741efb..0b0c555ff1b65 100644
--- a/clang/lib/Serialization/ASTWriter.cpp
+++ b/clang/lib/Serialization/ASTWriter.cpp
@@ -13,6 +13,7 @@
#include "ASTCommon.h"
#include "ASTReaderInternals.h"
#include "MultiOnDiskHashTable.h"
+#include "TemplateArgumentHasher.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/ASTUnresolvedSet.h"
#include "clang/AST/AbstractTypeWriter.h"
@@ -4208,7 +4209,7 @@ unsigned CalculateODRHashForSpecs(const Decl *Spec) {
else
llvm_unreachable("New Specialization Kind?");
- return TemplateArgumentList::ComputeODRHash(Args);
+ return StableHashForTemplateArguments(Args);
}
} // namespace
@@ -5870,7 +5871,7 @@ void ASTWriter::WriteDeclAndTypes(ASTContext &Context) {
void ASTWriter::WriteSpecializationsUpdates() {
auto Abv = std::make_shared<llvm::BitCodeAbbrev>();
- Abv->Add(llvm::BitCodeAbbrevOp(UPDATE_SPECIALIZATION));
+ Abv->Add(llvm::BitCodeAbbrevOp(CXX_ADDED_TEMPLATE_SPECIALIZATION));
Abv->Add(llvm::BitCodeAbbrevOp(llvm::BitCodeAbbrevOp::VBR, 6));
Abv->Add(llvm::BitCodeAbbrevOp(llvm::BitCodeAbbrevOp::Blob));
auto UpdateSpecializationAbbrev = Stream.EmitAbbrev(std::move(Abv));
@@ -5883,7 +5884,8 @@ void ASTWriter::WriteSpecializationsUpdates() {
LookupTable);
// Write the lookup table
- RecordData::value_type Record[] = {UPDATE_SPECIALIZATION, getDeclID(D).getRawValue()};
+ RecordData::value_type Record[] = {CXX_ADDED_TEMPLATE_SPECIALIZATION,
+ getDeclID(D).getRawValue()};
Stream.EmitRecordWithBlob(UpdateSpecializationAbbrev, Record, LookupTable);
}
}
@@ -5920,25 +5922,6 @@ void ASTWriter::WriteDeclUpdatesBlocks(RecordDataImpl &OffsetsRecord) {
assert(Update.getDecl() && "no decl to add?");
Record.AddDeclRef(Update.getDecl());
break;
- case UPD_CXX_ADDED_TEMPLATE_SPECIALIZATION: {
- const Decl *Spec = Update.getDecl();
- assert(Spec && "no decl to add?");
- Record.AddDeclRef(Spec);
- ArrayRef<TemplateArgument> Args;
- if (auto *CTSD = dyn_cast<ClassTemplateSpecializationDecl>(Spec))
- Args = CTSD->getTemplateArgs().asArray();
- else if (auto *VTSD = dyn_cast<VarTemplateSpecializationDecl>(Spec))
- Args = VTSD->getTemplateArgs().asArray();
- else if (auto *FD = dyn_cast<FunctionDecl>(Spec))
- Args = FD->getTemplateSpecializationArgs()->asArray();
- assert(Args.size());
- Record.push_back(TemplateArgumentList::ComputeODRHash(Args));
- bool IsPartialSpecialization =
- isa<ClassTemplatePartialSpecializationDecl>(Spec) ||
- isa<VarTemplatePartialSpecializationDecl>(Spec);
- Record.push_back(IsPartialSpecialization);
- break;
- }
case UPD_CXX_ADDED_FUNCTION_DEFINITION:
case UPD_CXX_ADDED_VAR_DEFINITION:
break;
diff --git a/clang/lib/Serialization/ASTWriterDecl.cpp b/clang/lib/Serialization/ASTWriterDecl.cpp
index d14889271fd32..a334c459cc892 100644
--- a/clang/lib/Serialization/ASTWriterDecl.cpp
+++ b/clang/lib/Serialization/ASTWriterDecl.cpp
@@ -216,24 +216,8 @@ namespace clang {
llvm::MapVector<ModuleFile *, const Decl *> Firsts;
CollectFirstDeclFromEachModule(D, /*IncludeLocal*/ true, Firsts);
- for (const auto &F : Firsts) {
+ for (const auto &F : Firsts)
SpecsInMap.push_back(F.second);
-
- Record.AddDeclRef(F.second);
- ArrayRef<TemplateArgument> Args;
- if (auto *CTSD = dyn_cast<ClassTemplateSpecializationDecl>(D))
- Args = CTSD->getTemplateArgs().asArray();
- else if (auto *VTSD = dyn_cast<VarTemplateSpecializationDecl>(D))
- Args = VTSD->getTemplateArgs().asArray();
- else if (auto *FD = dyn_cast<FunctionDecl>(D))
- Args = FD->getTemplateSpecializationArgs()->asArray();
- assert(Args.size());
- Record.push_back(TemplateArgumentList::ComputeODRHash(Args));
- bool IsPartialSpecialization =
- isa<ClassTemplatePartialSpecializationDecl>(D) ||
- isa<VarTemplatePartialSpecializationDecl>(D);
- Record.push_back(IsPartialSpecialization);
- }
}
/// Get the specialization decl from an entry in the specialization list.
@@ -260,22 +244,12 @@ namespace clang {
// If we have any lazy specializations, and the external AST source is
// our chained AST reader, we can just write out the DeclIDs. Otherwise,
// we need to resolve them to actual declarations.
- if (Writer.Chain != Writer.Context->getExternalSource() &&
- Common->LazySpecializations) {
+ if (Writer.Chain != Writer.Context->getExternalSource() && Writer.Chain &&
+ Writer.Chain->getLoadedSpecializationsLookupTables(D)) {
D->LoadLazySpecializations();
- assert(!Common->LazySpecializations);
+ assert(!Writer.Chain->getLoadedSpecializationsLookupTables(D));
}
- using LazySpecializationInfo =
- RedeclarableTemplateDecl::LazySpecializationInfo;
- ArrayRef<LazySpecializationInfo> LazySpecializations;
- if (auto *LS = Common->LazySpecializations)
- LazySpecializations = llvm::ArrayRef(LS + 1, LS[0].DeclID.getRawValue());
-
- // Add a slot to the record for the number of specializations.
- unsigned I = Record.size();
- Record.push_back(0);
-
// AddFirstDeclFromEachModule might trigger deserialization, invalidating
// *Specializations iterators.
llvm::SmallVector<const Decl*, 16> Specs;
@@ -291,21 +265,6 @@ namespace clang {
AddFirstSpecializationDeclFromEachModule(D, SpecsInOnDiskMap);
}
- // We don't need to insert LazySpecializations to SpecsInOnDiskMap,
- // since we'll handle that in GenerateSpecializationInfoLookupTable.
- for (auto &SpecInfo : LazySpecializations) {
- Record.push_back(SpecInfo.DeclID.getRawValue());
- Record.push_back(SpecInfo.ODRHash);
- Record.push_back(SpecInfo.IsPartial);
- }
-
- // Update the size entry we added earlier. We linerized the
- // LazySpecializationInfo members and we need to adjust the size as we
- // will read them always together.
- assert((Record.size() - I - 1) % 3 == 0 &&
- "Must be divisible by LazySpecializationInfo count!");
- Record[I] = (Record.size() - I - 1) / 3;
-
Record.AddOffset(
Writer.WriteSpecializationInfoLookupTable(D, SpecsInOnDiskMap));
}
@@ -328,9 +287,6 @@ namespace clang {
if (Writer.getFirstLocalDecl(Specialization) != Specialization)
return;
- Writer.DeclUpdates[Template].push_back(ASTWriter::DeclUpdate(
- UPD_CXX_ADDED_TEMPLATE_SPECIALIZATION, Specialization));
-
Writer.SpecializationsUpdates[cast<NamedDecl>(Template)].push_back(
cast<NamedDecl>(Specialization));
}
diff --git a/clang/lib/Serialization/CMakeLists.txt b/clang/lib/Serialization/CMakeLists.txt
index 5a4b3a58e9c45..59a95546ec57d 100644
--- a/clang/lib/Serialization/CMakeLists.txt
+++ b/clang/lib/Serialization/CMakeLists.txt
@@ -21,6 +21,7 @@ add_clang_library(clangSerialization
ModuleFileExtension.cpp
ModuleManager.cpp
PCHContainerOperations.cpp
+ TemplateArgumentHasher.cpp
ADDITIONAL_HEADERS
ASTCommon.h
diff --git a/clang/lib/Serialization/TemplateArgumentHasher.cpp b/clang/lib/Serialization/TemplateArgumentHasher.cpp
new file mode 100644
index 0000000000000..de0d8633a5c54
--- /dev/null
+++ b/clang/lib/Serialization/TemplateArgumentHasher.cpp
@@ -0,0 +1,423 @@
+//===- TemplateArgumentHasher.cpp - Hash Template Arguments -----*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "TemplateArgumentHasher.h"
+#include "clang/AST/APValue.h"
+#include "clang/AST/Decl.h"
+#include "clang/AST/DeclCXX.h"
+#include "clang/AST/DeclTemplate.h"
+#include "clang/AST/DeclarationName.h"
+#include "clang/AST/TypeVisitor.h"
+#include "clang/Basic/IdentifierTable.h"
+#include "llvm/ADT/FoldingSet.h"
+
+using namespace clang;
+
+namespace {
+
+class TemplateArgumentHasher {
+ // If we bail out during the process of calculating hash values for
+ // template arguments for any reason. We're allowed to do it since
+ // TemplateArgumentHasher are only required to give the same hash value
+ // for the same template arguments, but not required to give different
+ // hash value for different template arguments.
+ //
+ // So in the worst case, it is still a valid implementation to give all
+ // inputs the same BailedOutValue as output.
+ bool BailedOut = false;
+ static constexpr unsigned BailedOutValue = 0x12345678;
+
+ llvm::FoldingSetNodeID ID;
+public:
+ TemplateArgumentHasher() = default;
+
+ void AddTemplateArgument(TemplateArgument TA);
+
+ void AddInteger(unsigned V) {
+ ID.AddInteger(V);
+ }
+
+ unsigned getValue() {
+ if (BailedOut)
+ return BailedOutValue;
+
+ return ID.computeStableHash();
+ }
+
+ void setBailedOut() { BailedOut = true; }
+
+ void AddType(const Type *T);
+ void AddQualType(QualType T);
+ void AddDecl(const Decl *D);
+ void AddStructuralValue(const APValue &);
+ void AddTemplateName(TemplateName Name);
+ void AddDeclarationName(DeclarationName Name);
+ void AddIdentifierInfo(const IdentifierInfo *II);
+};
+
+void TemplateArgumentHasher::AddTemplateArgument(TemplateArgument TA) {
+ const auto Kind = TA.getKind();
+ AddInteger(Kind);
+
+ switch (Kind) {
+ case TemplateArgument::Null:
+ llvm_unreachable("Expected valid TemplateArgument");
+ case TemplateArgument::Type:
+ AddQualType(TA.getAsType());
+ break;
+ case TemplateArgument::Declaration:
+ AddDecl(TA.getAsDecl());
+ break;
+ case TemplateArgument::NullPtr:
+ ID.AddPointer(nullptr);
+ break;
+ case TemplateArgument::Integral: {
+ // There are integrals (e.g.: _BitInt(128)) that cannot be represented as
+ // any builtin integral type, so we use the hash of APSInt instead.
+ TA.getAsIntegral().Profile(ID);
+ break;
+ }
+ case TemplateArgument::StructuralValue:
+ AddQualType(TA.getStructuralValueType());
+ AddStructuralValue(TA.getAsStructuralValue());
+ break;
+ case TemplateArgument::Template:
+ case TemplateArgument::TemplateExpansion:
+ AddTemplateName(TA.getAsTemplateOrTemplatePattern());
+ break;
+ case TemplateArgument::Expression:
+ // If we meet expression in template argument, it implies
+ // that the template is still dependent. It is meaningless
+ // to get a stable hash for the template. Bail out simply.
+ BailedOut = true;
+ break;
+ case TemplateArgument::Pack:
+ AddInteger(TA.pack_size());
+ for (auto SubTA : TA.pack_elements()) {
+ AddTemplateArgument(SubTA);
+ }
+ break;
+ }
+}
+
+void TemplateArgumentHasher::AddStructuralValue(const APValue &Value) {
+ auto Kind = Value.getKind();
+ AddInteger(Kind);
+
+ // 'APValue::Profile' uses pointer values to make hash for LValue and
+ // MemberPointer, but they differ from one compiler invocation to another.
+ // It may be difficult to handle such cases. Bail out simply.
+
+ if (Kind == APValue::LValue || Kind == APValue::MemberPointer) {
+ BailedOut = true;
+ return;
+ }
+
+ Value.Profile(ID);
+}
+
+void TemplateArgumentHasher::AddTemplateName(TemplateName Name) {
+ switch (Name.getKind()) {
+ case TemplateName::Template:
+ AddDecl(Name.getAsTemplateDecl());
+ break;
+ case TemplateName::QualifiedTemplate: {
+ QualifiedTemplateName *QTN = Name.getAsQualifiedTemplateName();
+ AddTemplateName(QTN->getUnderlyingTemplate());
+ break;
+ }
+ case TemplateName::OverloadedTemplate:
+ case TemplateName::AssumedTemplate:
+ case TemplateName::DependentTemplate:
+ case TemplateName::SubstTemplateTemplateParm:
+ case TemplateName::SubstTemplateTemplateParmPack:
+ BailedOut = true;
+ break;
+ case TemplateName::UsingTemplate:
+ UsingShadowDecl *USD = Name.getAsUsingShadowDecl();
+ if (USD)
+ AddDecl(USD->getTargetDecl());
+ else
+ BailedOut = true;
+ break;
+ }
+}
+
+void TemplateArgumentHasher::AddIdentifierInfo(const IdentifierInfo *II) {
+ assert(II && "Expecting non-null pointer.");
+ ID.AddString(II->getName());
+}
+
+void TemplateArgumentHasher::AddDeclarationName(DeclarationName Name) {
+ if (Name.isEmpty())
+ return;
+
+ switch(Name.getNameKind()) {
+ case DeclarationName::Identifier:
+ AddIdentifierInfo(Name.getAsIdentifierInfo());
+ break;
+ case DeclarationName::ObjCZeroArgSelector:
+ case DeclarationName::ObjCOneArgSelector:
+ case DeclarationName::ObjCMultiArgSelector:
+ BailedOut = true;
+ break;
+ case DeclarationName::CXXConstructorName:
+ case DeclarationName::CXXDestructorName:
+ AddQualType(Name.getCXXNameType());
+ break;
+ case DeclarationName::CXXOperatorName:
+ AddInteger(Name.getCXXOverloadedOperator());
+ break;
+ case DeclarationName::CXXLiteralOperatorName:
+ AddIdentifierInfo(Name.getCXXLiteralIdentifier());
+ break;
+ case DeclarationName::CXXConversionFunctionName:
+ AddQualType(Name.getCXXNameType());
+ break;
+ case DeclarationName::CXXUsingDirective:
+ break;
+ case DeclarationName::CXXDeductionGuideName: {
+ if (auto *Template = Name.getCXXDeductionGuideTemplate())
+ AddDecl(Template);
+ }
+ }
+}
+
+void TemplateArgumentHasher::AddDecl(const Decl *D) {
+ const NamedDecl *ND = dyn_cast<NamedDecl>(D);
+ if (!ND) {
+ BailedOut = true;
+ return;
+ }
+
+ AddDeclarationName(ND->getDeclName());
+}
+
+void TemplateArgumentHasher::AddQualType(QualType T) {
+ if (T.isNull()) {
+ BailedOut = true;
+ return;
+ }
+ SplitQualType split = T.split();
+ AddInteger(split.Quals.getAsOpaqueValue());
+ AddType(split.Ty);
+}
+
+// Process a Type pointer. Add* methods call back into TemplateArgumentHasher
+// while Visit* methods process the relevant parts of the Type.
+// Any unhandled type will make the hash computation bail out.
+class TypeVisitorHelper : public TypeVisitor<TypeVisitorHelper> {
+ typedef TypeVisitor<TypeVisitorHelper> Inherited;
+ llvm::FoldingSetNodeID &ID;
+ TemplateArgumentHasher &Hash;
+
+public:
+ TypeVisitorHelper(llvm::FoldingSetNodeID &ID, TemplateArgumentHasher &Hash)
+ : ID(ID), Hash(Hash) {}
+
+ void AddDecl(const Decl *D) {
+ if (D)
+ Hash.AddDecl(D);
+ else
+ Hash.AddInteger(0);
+ }
+
+ void AddQualType(QualType T) {
+ Hash.AddQualType(T);
+ }
+
+ void AddType(const Type *T) {
+ if (T)
+ Hash.AddType(T);
+ else
+ Hash.AddInteger(0);
+ }
+
+ void VisitQualifiers(Qualifiers Quals) {
+ Hash.AddInteger(Quals.getAsOpaqueValue());
+ }
+
+ void Visit(const Type *T) {
+ Inherited::Visit(T);
+ }
+
+ // Unhandled types. Bail out simply.
+ void VisitType(const Type *T) {
+ Hash.setBailedOut();
+ }
+
+ void VisitAdjustedType(const AdjustedType *T) {
+ AddQualType(T->getOriginalType());
+ }
+
+ void VisitDecayedType(const DecayedType *T) {
+ // getDecayedType and getPointeeType are derived from getAdjustedType
+ // and don't need to be separately processed.
+ VisitAdjustedType(T);
+ }
+
+ void VisitArrayType(const ArrayType *T) {
+ AddQualType(T->getElementType());
+ Hash.AddInteger(llvm::to_underlying(T->getSizeModifier()));
+ VisitQualifiers(T->getIndexTypeQualifiers());
+ }
+ void VisitConstantArrayType(const ConstantArrayType *T) {
+ T->getSize().Profile(ID);
+ VisitArrayType(T);
+ }
+
+ void VisitAttributedType(const AttributedType *T) {
+ Hash.AddInteger(T->getAttrKind());
+ AddQualType(T->getModifiedType());
+ }
+
+ void VisitBuiltinType(const BuiltinType *T) {
+ Hash.AddInteger(T->getKind());
+ }
+
+ void VisitComplexType(const ComplexType *T) {
+ AddQualType(T->getElementType());
+ }
+
+ void VisitDecltypeType(const DecltypeType *T) {
+ AddQualType(T->getUnderlyingType());
+ }
+
+ void VisitDeducedType(const DeducedType *T) {
+ AddQualType(T->getDeducedType());
+ }
+
+ void VisitAutoType(const AutoType *T) {
+ VisitDeducedType(T);
+ }
+
+ void VisitDeducedTemplateSpecializationType(
+ const DeducedTemplateSpecializationType *T) {
+ Hash.AddTemplateName(T->getTemplateName());
+ VisitDeducedType(T);
+ }
+
+ void VisitFunctionType(const FunctionType *T) {
+ AddQualType(T->getReturnType());
+ T->getExtInfo().Profile(ID);
+ Hash.AddInteger(T->isConst());
+ Hash.AddInteger(T->isVolatile());
+ Hash.AddInteger(T->isRestrict());
+ }
+
+ void VisitFunctionNoProtoType(const FunctionNoProtoType *T) {
+ VisitFunctionType(T);
+ }
+
+ void VisitFunctionProtoType(const FunctionProtoType *T) {
+ Hash.AddInteger(T->getNumParams());
+ for (auto ParamType : T->getParamTypes())
+ AddQualType(ParamType);
+
+ VisitFunctionType(T);
+ }
+
+ void VisitMemberPointerType(const MemberPointerType *T) {
+ AddQualType(T->getPointeeType());
+ AddType(T->getClass());
+ }
+
+ void VisitPackExpansionType(const PackExpansionType *T) {
+ AddQualType(T->getPattern());
+ }
+
+ void VisitParenType(const ParenType *T) {
+ AddQualType(T->getInnerType());
+ }
+
+ void VisitPointerType(const PointerType *T) {
+ AddQualType(T->getPointeeType());
+ }
+
+ void VisitReferenceType(const ReferenceType *T) {
+ AddQualType(T->getPointeeTypeAsWritten());
+ }
+
+ void VisitLValueReferenceType(const LValueReferenceType *T) {
+ VisitReferenceType(T);
+ }
+
+ void VisitRValueReferenceType(const RValueReferenceType *T) {
+ VisitReferenceType(T);
+ }
+
+ void
+ VisitSubstTemplateTypeParmPackType(const SubstTemplateTypeParmPackType *T) {
+ AddDecl(T->getAssociatedDecl());
+ Hash.AddTemplateArgument(T->getArgumentPack());
+ }
+
+ void VisitSubstTemplateTypeParmType(const SubstTemplateTypeParmType *T) {
+ AddDecl(T->getAssociatedDecl());
+ AddQualType(T->getReplacementType());
+ }
+
+ void VisitTagType(const TagType *T) {
+ AddDecl(T->getDecl());
+ }
+
+ void VisitRecordType(const RecordType *T) { VisitTagType(T); }
+ void VisitEnumType(const EnumType *T) { VisitTagType(T); }
+
+ void VisitTemplateSpecializationType(const TemplateSpecializationType *T) {
+ Hash.AddInteger(T->template_arguments().size());
+ for (const auto &TA : T->template_arguments()) {
+ Hash.AddTemplateArgument(TA);
+ }
+ Hash.AddTemplateName(T->getTemplateName());
+ }
+
+ void VisitTemplateTypeParmType(const TemplateTypeParmType *T) {
+ Hash.AddInteger(T->getDepth());
+ Hash.AddInteger(T->getIndex());
+ Hash.AddInteger(T->isParameterPack());
+ }
+
+ void VisitTypedefType(const TypedefType *T) {
+ AddDecl(T->getDecl());
+ }
+
+ void VisitElaboratedType(const ElaboratedType *T) {
+ AddQualType(T->getNamedType());
+ }
+
+ void VisitUnaryTransformType(const UnaryTransformType *T) {
+ AddQualType(T->getUnderlyingType());
+ AddQualType(T->getBaseType());
+ }
+
+ void VisitVectorType(const VectorType *T) {
+ AddQualType(T->getElementType());
+ Hash.AddInteger(T->getNumElements());
+ Hash.AddInteger(llvm::to_underlying(T->getVectorKind()));
+ }
+
+ void VisitExtVectorType(const ExtVectorType * T) {
+ VisitVectorType(T);
+ }
+};
+
+void TemplateArgumentHasher::AddType(const Type *T) {
+ assert(T && "Expecting non-null pointer.");
+ TypeVisitorHelper(ID, *this).Visit(T);
+}
+
+}
+
+unsigned clang::serialization::StableHashForTemplateArguments(llvm::ArrayRef<TemplateArgument> Args) {
+ TemplateArgumentHasher Hasher;
+ Hasher.AddInteger(Args.size());
+ for (TemplateArgument Arg : Args)
+ Hasher.AddTemplateArgument(Arg);
+ return Hasher.getValue();
+}
diff --git a/clang/lib/Serialization/TemplateArgumentHasher.h b/clang/lib/Serialization/TemplateArgumentHasher.h
new file mode 100644
index 0000000000000..8ead99556be5f
--- /dev/null
+++ b/clang/lib/Serialization/TemplateArgumentHasher.h
@@ -0,0 +1,34 @@
+//===- TemplateArgumentHasher.h - Hash Template Arguments -------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/AST/TemplateBase.h"
+
+namespace clang {
+namespace serialization {
+
+/// Calculate a stable hash value for template arguments. We guarantee that
+/// the same template arguments must have the same hashed values. But we don't
+/// guarantee that the template arguments with the same hashed value are the
+/// same template arguments.
+///
+/// ODR hashing may not be the best mechanism to hash the template
+/// arguments. ODR hashing is (or perhaps, should be) about determining whether
+/// two things are spelled the same way and have the same meaning (as required
+/// by the C++ ODR), whereas what we want here is whether they have the same
+/// meaning regardless of spelling. Maybe we can get away with reusing ODR
+/// hashing anyway, on the basis that any canonical, non-dependent template
+/// argument should have the same (invented) spelling in every translation
+/// unit, but it is not sure that's true in all cases. There may still be cases
+/// where the canonical type includes some aspect of "whatever we saw first",
+/// in which case the ODR hash can differ across translation units for
+/// non-dependent, canonical template arguments that are spelled differently
+/// but have the same meaning. But it is not easy to raise examples.
+unsigned StableHashForTemplateArguments(llvm::ArrayRef<TemplateArgument> Args);
+
+}
+}
diff --git a/clang/test/Modules/cxx-templates.cpp b/clang/test/Modules/cxx-templates.cpp
index e10ba7c2ac3ef..b7d5741e69af6 100644
--- a/clang/test/Modules/cxx-templates.cpp
+++ b/clang/test/Modules/cxx-templates.cpp
@@ -251,7 +251,7 @@ namespace Std {
// CHECK-DUMP: ClassTemplateDecl {{.*}} <{{.*[/\\]}}cxx-templates-common.h:1:1, {{.*}}> col:{{.*}} in cxx_templates_common SomeTemplate
// CHECK-DUMP: ClassTemplateSpecializationDecl {{.*}} prev {{.*}} SomeTemplate
-// CHECK-DUMP-NEXT: TemplateArgument type 'char[1]'
+// CHECK-DUMP-NEXT: TemplateArgument type 'char[2]'
// CHECK-DUMP: ClassTemplateSpecializationDecl {{.*}} SomeTemplate definition
// CHECK-DUMP-NEXT: DefinitionData
// CHECK-DUMP-NEXT: DefaultConstructor
@@ -260,9 +260,9 @@ namespace Std {
// CHECK-DUMP-NEXT: CopyAssignment
// CHECK-DUMP-NEXT: MoveAssignment
// CHECK-DUMP-NEXT: Destructor
-// CHECK-DUMP-NEXT: TemplateArgument type 'char[1]'
-// CHECK-DUMP: ClassTemplateSpecializationDecl {{.*}} prev {{.*}} SomeTemplate
// CHECK-DUMP-NEXT: TemplateArgument type 'char[2]'
+// CHECK-DUMP: ClassTemplateSpecializationDecl {{.*}} prev {{.*}} SomeTemplate
+// CHECK-DUMP-NEXT: TemplateArgument type 'char[1]'
// CHECK-DUMP: ClassTemplateSpecializationDecl {{.*}} SomeTemplate definition
// CHECK-DUMP-NEXT: DefinitionData
// CHECK-DUMP-NEXT: DefaultConstructor
@@ -271,4 +271,4 @@ namespace Std {
// CHECK-DUMP-NEXT: CopyAssignment
// CHECK-DUMP-NEXT: MoveAssignment
// CHECK-DUMP-NEXT: Destructor
-// CHECK-DUMP-NEXT: TemplateArgument type 'char[2]'
+// CHECK-DUMP-NEXT: TemplateArgument type 'char[1]'
diff --git a/clang/test/Modules/recursive-instantiations.cppm b/clang/test/Modules/recursive-instantiations.cppm
new file mode 100644
index 0000000000000..d5854b0e647e3
--- /dev/null
+++ b/clang/test/Modules/recursive-instantiations.cppm
@@ -0,0 +1,40 @@
+// RUN: rm -rf %t
+// RUN: mkdir -p %t
+// RUN: split-file %s %t
+//
+// RUN: %clang_cc1 -std=c++20 %t/type_traits.cppm -emit-module-interface -o %t/type_traits.pcm
+// RUN: %clang_cc1 -std=c++20 %t/test.cpp -fprebuilt-module-path=%t -verify
+
+//--- type_traits.cppm
+export module type_traits;
+
+export template <typename T>
+constexpr bool is_pod_v = __is_pod(T);
+
+//--- test.cpp
+// expected-no-diagnostics
+import type_traits;
+// Base is either void or wrapper<T>.
+template <class Base> struct wrapper : Base {};
+template <> struct wrapper<void> {};
+
+// wrap<0>::type<T> is wrapper<T>, wrap<1>::type<T> is wrapper<wrapper<T>>,
+// and so on.
+template <int N>
+struct wrap {
+ template <class Base>
+ using type = wrapper<typename wrap<N-1>::template type<Base>>;
+};
+
+template <>
+struct wrap<0> {
+ template <class Base>
+ using type = wrapper<Base>;
+};
+
+inline constexpr int kMaxRank = 40;
+template <int N, class Base = void>
+using rank = typename wrap<N>::template type<Base>;
+using rank_selector_t = rank<kMaxRank>;
+
+static_assert(is_pod_v<rank_selector_t>, "Must be POD");
diff --git a/clang/test/OpenMP/target_parallel_ast_print.cpp b/clang/test/OpenMP/target_parallel_ast_print.cpp
index 7e27ac7b92ca4..3ee98bc525c1b 100644
--- a/clang/test/OpenMP/target_parallel_ast_print.cpp
+++ b/clang/test/OpenMP/target_parallel_ast_print.cpp
@@ -38,10 +38,6 @@ struct S {
// CHECK: static int TS;
// CHECK-NEXT: #pragma omp threadprivate(S<int>::TS)
// CHECK-NEXT: }
-// CHECK: template<> struct S<char> {
-// CHECK: static char TS;
-// CHECK-NEXT: #pragma omp threadprivate(S<char>::TS)
-// CHECK-NEXT: }
template <typename T, int C>
T tmain(T argc, T *argv) {
diff --git a/clang/test/OpenMP/target_teams_ast_print.cpp b/clang/test/OpenMP/target_teams_ast_print.cpp
index 2ff34e4498bfe..358200bd57c18 100644
--- a/clang/test/OpenMP/target_teams_ast_print.cpp
+++ b/clang/test/OpenMP/target_teams_ast_print.cpp
@@ -40,10 +40,6 @@ struct S {
// CHECK: static int TS;
// CHECK-NEXT: #pragma omp threadprivate(S<int>::TS)
// CHECK-NEXT: }
-// CHECK: template<> struct S<long> {
-// CHECK: static long TS;
-// CHECK-NEXT: #pragma omp threadprivate(S<long>::TS)
-// CHECK-NEXT: }
template <typename T, int C>
T tmain(T argc, T *argv) {
diff --git a/clang/test/OpenMP/task_ast_print.cpp b/clang/test/OpenMP/task_ast_print.cpp
index 2a6b8908a1e2d..30fb7ab75cc87 100644
--- a/clang/test/OpenMP/task_ast_print.cpp
+++ b/clang/test/OpenMP/task_ast_print.cpp
@@ -87,10 +87,6 @@ struct S {
// CHECK: static int TS;
// CHECK-NEXT: #pragma omp threadprivate(S<int>::TS)
// CHECK-NEXT: }
-// CHECK: template<> struct S<long> {
-// CHECK: static long TS;
-// CHECK-NEXT: #pragma omp threadprivate(S<long>::TS)
-// CHECK-NEXT: }
template <typename T, int C>
T tmain(T argc, T *argv) {
diff --git a/clang/test/OpenMP/teams_ast_print.cpp b/clang/test/OpenMP/teams_ast_print.cpp
index 0087f71ac9f74..597a9b2bdbdc5 100644
--- a/clang/test/OpenMP/teams_ast_print.cpp
+++ b/clang/test/OpenMP/teams_ast_print.cpp
@@ -27,10 +27,6 @@ struct S {
// CHECK: static int TS;
// CHECK-NEXT: #pragma omp threadprivate(S<int>::TS)
// CHECK-NEXT: }
-// CHECK: template<> struct S<long> {
-// CHECK: static long TS;
-// CHECK-NEXT: #pragma omp threadprivate(S<long>::TS)
-// CHECK-NEXT: }
template <typename T, int C>
T tmain(T argc, T *argv) {
>From e883be85e91243137ca4c44a8b78f4617f9dba54 Mon Sep 17 00:00:00 2001
From: Chuanqi Xu <yedeng.yd at linux.alibaba.com>
Date: Wed, 10 Jul 2024 17:52:56 +0800
Subject: [PATCH 2/2] fmt
---
clang/lib/Serialization/ASTReader.cpp | 5 +-
.../Serialization/TemplateArgumentHasher.cpp | 122 ++++++++----------
.../Serialization/TemplateArgumentHasher.h | 4 +-
3 files changed, 57 insertions(+), 74 deletions(-)
diff --git a/clang/lib/Serialization/ASTReader.cpp b/clang/lib/Serialization/ASTReader.cpp
index f75d8fc4676b3..bd0ebda69b0d8 100644
--- a/clang/lib/Serialization/ASTReader.cpp
+++ b/clang/lib/Serialization/ASTReader.cpp
@@ -7697,7 +7697,8 @@ void ASTReader::CompleteRedeclChain(const Decl *D) {
if (Template) {
// For partitial specialization, load all the specializations for safety.
- if (isa<ClassTemplatePartialSpecializationDecl, VarTemplatePartialSpecializationDecl>(D))
+ if (isa<ClassTemplatePartialSpecializationDecl,
+ VarTemplatePartialSpecializationDecl>(D))
Template->loadLazySpecializationsImpl();
else
Template->loadLazySpecializationsImpl(Args);
@@ -8033,7 +8034,7 @@ bool ASTReader::LoadExternalSpecializations(const Decl *D, bool OnlyPartial) {
// the lookup table.
if (!OnlyPartial)
SpecializationsLookups.erase(It);
-
+
bool NewSpecsFound = false;
Deserializing LookupResults(this);
for (auto &Info : Infos)
diff --git a/clang/lib/Serialization/TemplateArgumentHasher.cpp b/clang/lib/Serialization/TemplateArgumentHasher.cpp
index de0d8633a5c54..ab7ea262cddf6 100644
--- a/clang/lib/Serialization/TemplateArgumentHasher.cpp
+++ b/clang/lib/Serialization/TemplateArgumentHasher.cpp
@@ -33,19 +33,18 @@ class TemplateArgumentHasher {
static constexpr unsigned BailedOutValue = 0x12345678;
llvm::FoldingSetNodeID ID;
+
public:
TemplateArgumentHasher() = default;
void AddTemplateArgument(TemplateArgument TA);
- void AddInteger(unsigned V) {
- ID.AddInteger(V);
- }
+ void AddInteger(unsigned V) { ID.AddInteger(V); }
unsigned getValue() {
if (BailedOut)
return BailedOutValue;
-
+
return ID.computeStableHash();
}
@@ -65,43 +64,43 @@ void TemplateArgumentHasher::AddTemplateArgument(TemplateArgument TA) {
AddInteger(Kind);
switch (Kind) {
- case TemplateArgument::Null:
- llvm_unreachable("Expected valid TemplateArgument");
- case TemplateArgument::Type:
- AddQualType(TA.getAsType());
- break;
- case TemplateArgument::Declaration:
- AddDecl(TA.getAsDecl());
- break;
- case TemplateArgument::NullPtr:
- ID.AddPointer(nullptr);
- break;
- case TemplateArgument::Integral: {
- // There are integrals (e.g.: _BitInt(128)) that cannot be represented as
- // any builtin integral type, so we use the hash of APSInt instead.
- TA.getAsIntegral().Profile(ID);
- break;
+ case TemplateArgument::Null:
+ llvm_unreachable("Expected valid TemplateArgument");
+ case TemplateArgument::Type:
+ AddQualType(TA.getAsType());
+ break;
+ case TemplateArgument::Declaration:
+ AddDecl(TA.getAsDecl());
+ break;
+ case TemplateArgument::NullPtr:
+ ID.AddPointer(nullptr);
+ break;
+ case TemplateArgument::Integral: {
+ // There are integrals (e.g.: _BitInt(128)) that cannot be represented as
+ // any builtin integral type, so we use the hash of APSInt instead.
+ TA.getAsIntegral().Profile(ID);
+ break;
+ }
+ case TemplateArgument::StructuralValue:
+ AddQualType(TA.getStructuralValueType());
+ AddStructuralValue(TA.getAsStructuralValue());
+ break;
+ case TemplateArgument::Template:
+ case TemplateArgument::TemplateExpansion:
+ AddTemplateName(TA.getAsTemplateOrTemplatePattern());
+ break;
+ case TemplateArgument::Expression:
+ // If we meet expression in template argument, it implies
+ // that the template is still dependent. It is meaningless
+ // to get a stable hash for the template. Bail out simply.
+ BailedOut = true;
+ break;
+ case TemplateArgument::Pack:
+ AddInteger(TA.pack_size());
+ for (auto SubTA : TA.pack_elements()) {
+ AddTemplateArgument(SubTA);
}
- case TemplateArgument::StructuralValue:
- AddQualType(TA.getStructuralValueType());
- AddStructuralValue(TA.getAsStructuralValue());
- break;
- case TemplateArgument::Template:
- case TemplateArgument::TemplateExpansion:
- AddTemplateName(TA.getAsTemplateOrTemplatePattern());
- break;
- case TemplateArgument::Expression:
- // If we meet expression in template argument, it implies
- // that the template is still dependent. It is meaningless
- // to get a stable hash for the template. Bail out simply.
- BailedOut = true;
- break;
- case TemplateArgument::Pack:
- AddInteger(TA.pack_size());
- for (auto SubTA : TA.pack_elements()) {
- AddTemplateArgument(SubTA);
- }
- break;
+ break;
}
}
@@ -157,7 +156,7 @@ void TemplateArgumentHasher::AddDeclarationName(DeclarationName Name) {
if (Name.isEmpty())
return;
- switch(Name.getNameKind()) {
+ switch (Name.getNameKind()) {
case DeclarationName::Identifier:
AddIdentifierInfo(Name.getAsIdentifierInfo());
break;
@@ -227,9 +226,7 @@ class TypeVisitorHelper : public TypeVisitor<TypeVisitorHelper> {
Hash.AddInteger(0);
}
- void AddQualType(QualType T) {
- Hash.AddQualType(T);
- }
+ void AddQualType(QualType T) { Hash.AddQualType(T); }
void AddType(const Type *T) {
if (T)
@@ -242,14 +239,10 @@ class TypeVisitorHelper : public TypeVisitor<TypeVisitorHelper> {
Hash.AddInteger(Quals.getAsOpaqueValue());
}
- void Visit(const Type *T) {
- Inherited::Visit(T);
- }
+ void Visit(const Type *T) { Inherited::Visit(T); }
// Unhandled types. Bail out simply.
- void VisitType(const Type *T) {
- Hash.setBailedOut();
- }
+ void VisitType(const Type *T) { Hash.setBailedOut(); }
void VisitAdjustedType(const AdjustedType *T) {
AddQualType(T->getOriginalType());
@@ -276,9 +269,7 @@ class TypeVisitorHelper : public TypeVisitor<TypeVisitorHelper> {
AddQualType(T->getModifiedType());
}
- void VisitBuiltinType(const BuiltinType *T) {
- Hash.AddInteger(T->getKind());
- }
+ void VisitBuiltinType(const BuiltinType *T) { Hash.AddInteger(T->getKind()); }
void VisitComplexType(const ComplexType *T) {
AddQualType(T->getElementType());
@@ -292,9 +283,7 @@ class TypeVisitorHelper : public TypeVisitor<TypeVisitorHelper> {
AddQualType(T->getDeducedType());
}
- void VisitAutoType(const AutoType *T) {
- VisitDeducedType(T);
- }
+ void VisitAutoType(const AutoType *T) { VisitDeducedType(T); }
void VisitDeducedTemplateSpecializationType(
const DeducedTemplateSpecializationType *T) {
@@ -331,9 +320,7 @@ class TypeVisitorHelper : public TypeVisitor<TypeVisitorHelper> {
AddQualType(T->getPattern());
}
- void VisitParenType(const ParenType *T) {
- AddQualType(T->getInnerType());
- }
+ void VisitParenType(const ParenType *T) { AddQualType(T->getInnerType()); }
void VisitPointerType(const PointerType *T) {
AddQualType(T->getPointeeType());
@@ -362,9 +349,7 @@ class TypeVisitorHelper : public TypeVisitor<TypeVisitorHelper> {
AddQualType(T->getReplacementType());
}
- void VisitTagType(const TagType *T) {
- AddDecl(T->getDecl());
- }
+ void VisitTagType(const TagType *T) { AddDecl(T->getDecl()); }
void VisitRecordType(const RecordType *T) { VisitTagType(T); }
void VisitEnumType(const EnumType *T) { VisitTagType(T); }
@@ -383,9 +368,7 @@ class TypeVisitorHelper : public TypeVisitor<TypeVisitorHelper> {
Hash.AddInteger(T->isParameterPack());
}
- void VisitTypedefType(const TypedefType *T) {
- AddDecl(T->getDecl());
- }
+ void VisitTypedefType(const TypedefType *T) { AddDecl(T->getDecl()); }
void VisitElaboratedType(const ElaboratedType *T) {
AddQualType(T->getNamedType());
@@ -402,9 +385,7 @@ class TypeVisitorHelper : public TypeVisitor<TypeVisitorHelper> {
Hash.AddInteger(llvm::to_underlying(T->getVectorKind()));
}
- void VisitExtVectorType(const ExtVectorType * T) {
- VisitVectorType(T);
- }
+ void VisitExtVectorType(const ExtVectorType *T) { VisitVectorType(T); }
};
void TemplateArgumentHasher::AddType(const Type *T) {
@@ -412,9 +393,10 @@ void TemplateArgumentHasher::AddType(const Type *T) {
TypeVisitorHelper(ID, *this).Visit(T);
}
-}
+} // namespace
-unsigned clang::serialization::StableHashForTemplateArguments(llvm::ArrayRef<TemplateArgument> Args) {
+unsigned clang::serialization::StableHashForTemplateArguments(
+ llvm::ArrayRef<TemplateArgument> Args) {
TemplateArgumentHasher Hasher;
Hasher.AddInteger(Args.size());
for (TemplateArgument Arg : Args)
diff --git a/clang/lib/Serialization/TemplateArgumentHasher.h b/clang/lib/Serialization/TemplateArgumentHasher.h
index 8ead99556be5f..f23f1318afbbf 100644
--- a/clang/lib/Serialization/TemplateArgumentHasher.h
+++ b/clang/lib/Serialization/TemplateArgumentHasher.h
@@ -30,5 +30,5 @@ namespace serialization {
/// but have the same meaning. But it is not easy to raise examples.
unsigned StableHashForTemplateArguments(llvm::ArrayRef<TemplateArgument> Args);
-}
-}
+} // namespace serialization
+} // namespace clang
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