https://github.com/ChuanqiXu9 updated
https://github.com/llvm/llvm-project/pull/83108
>From a2cac54ad725c18827226f74675312ace0239fa3 Mon Sep 17 00:00:00 2001
From: Vassil Vassilev <v.g.vassi...@gmail.com>
Date: Sun, 7 Jan 2018 15:16:11 +0200
Subject: [PATCH] D41416: [modules] [pch] Do not deserialize all lazy template
specializations when looking for one.
---
clang/include/clang/AST/DeclTemplate.h | 36 ++++++++-
clang/lib/AST/DeclTemplate.cpp | 98 +++++++++++++++++------
clang/lib/AST/ODRHash.cpp | 15 ++++
clang/lib/Serialization/ASTReader.cpp | 25 ++++--
clang/lib/Serialization/ASTReaderDecl.cpp | 44 ++++++----
clang/lib/Serialization/ASTWriter.cpp | 21 ++++-
clang/lib/Serialization/ASTWriterDecl.cpp | 78 ++++++++++++++----
clang/test/Modules/cxx-templates.cpp | 8 +-
clang/test/Modules/odr_hash.cpp | 4 +-
9 files changed, 257 insertions(+), 72 deletions(-)
diff --git a/clang/include/clang/AST/DeclTemplate.h
b/clang/include/clang/AST/DeclTemplate.h
index 0f0c0bf6e4ef4f..5ee373a0db5027 100644
--- a/clang/include/clang/AST/DeclTemplate.h
+++ b/clang/include/clang/AST/DeclTemplate.h
@@ -256,6 +256,9 @@ 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,
@@ -729,6 +732,26 @@ 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 {
using DeclType = EntryType;
@@ -769,7 +792,12 @@ class RedeclarableTemplateDecl : public TemplateDecl,
return SpecIterator<EntryType>(isEnd ? Specs.end() : Specs.begin());
}
- void loadLazySpecializationsImpl() const;
+ void loadLazySpecializationsImpl(bool OnlyPartial = false) const;
+
+ void loadLazySpecializationsImpl(llvm::ArrayRef<TemplateArgument> Args,
+ TemplateParameterList *TPL = nullptr) const;
+
+ Decl *loadLazySpecializationImpl(LazySpecializationInfo &LazySpecInfo) const;
template <class EntryType, typename ...ProfileArguments>
typename SpecEntryTraits<EntryType>::DeclType*
@@ -792,7 +820,7 @@ class RedeclarableTemplateDecl : public TemplateDecl,
///
/// The first value in the array is the number of specializations/partial
/// specializations that follow.
- GlobalDeclID *LazySpecializations = nullptr;
+ LazySpecializationInfo *LazySpecializations = nullptr;
/// The set of "injected" template arguments used within this
/// template.
@@ -2299,7 +2327,7 @@ class ClassTemplateDecl : public RedeclarableTemplateDecl
{
friend class TemplateDeclInstantiator;
/// Load any lazily-loaded specializations from the external source.
- void LoadLazySpecializations() const;
+ void LoadLazySpecializations(bool OnlyPartial = false) const;
/// Get the underlying class declarations of the template.
CXXRecordDecl *getTemplatedDecl() const {
@@ -3060,7 +3088,7 @@ class VarTemplateDecl : public RedeclarableTemplateDecl {
friend class ASTDeclWriter;
/// Load any lazily-loaded specializations from the external source.
- void LoadLazySpecializations() const;
+ void LoadLazySpecializations(bool OnlyPartial = false) const;
/// Get the underlying variable declarations of the template.
VarDecl *getTemplatedDecl() const {
diff --git a/clang/lib/AST/DeclTemplate.cpp b/clang/lib/AST/DeclTemplate.cpp
index d2d8907b884ec8..b56dd39b81b835 100644
--- a/clang/lib/AST/DeclTemplate.cpp
+++ b/clang/lib/AST/DeclTemplate.cpp
@@ -16,7 +16,9 @@
#include "clang/AST/DeclCXX.h"
#include "clang/AST/DeclarationName.h"
#include "clang/AST/Expr.h"
+#include "clang/AST/ExprCXX.h"
#include "clang/AST/ExternalASTSource.h"
+#include "clang/AST/ODRHash.h"
#include "clang/AST/TemplateBase.h"
#include "clang/AST/TemplateName.h"
#include "clang/AST/Type.h"
@@ -340,17 +342,44 @@ RedeclarableTemplateDecl::CommonBase
*RedeclarableTemplateDecl::getCommonPtr() c
return getCommonPtrInternal();
}
-void RedeclarableTemplateDecl::loadLazySpecializationsImpl() const {
+void RedeclarableTemplateDecl::loadLazySpecializationsImpl(
+ bool OnlyPartial /*=false*/) const {
// Grab the most recent declaration to ensure we've loaded any lazy
// redeclarations of this template.
CommonBase *CommonBasePtr = getMostRecentDecl()->getCommonPtr();
- if (CommonBasePtr->LazySpecializations) {
- ASTContext &Context = getASTContext();
- GlobalDeclID *Specs = CommonBasePtr->LazySpecializations;
- CommonBasePtr->LazySpecializations = nullptr;
- unsigned SpecSize = (*Specs++).getRawValue();
- for (unsigned I = 0; I != SpecSize; ++I)
- (void)Context.getExternalSource()->GetExternalDecl(Specs[I]);
+ 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 {
+ 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(
+ ArrayRef<TemplateArgument> Args, TemplateParameterList *TPL) const {
+ 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]);
}
}
@@ -361,6 +390,8 @@ RedeclarableTemplateDecl::findSpecializationImpl(
ProfileArguments&&... ProfileArgs) {
using SETraits = SpecEntryTraits<EntryType>;
+ loadLazySpecializationsImpl(std::forward<ProfileArguments>(ProfileArgs)...);
+
llvm::FoldingSetNodeID ID;
EntryType::Profile(ID, std::forward<ProfileArguments>(ProfileArgs)...,
getASTContext());
@@ -376,10 +407,14 @@ void RedeclarableTemplateDecl::addSpecializationImpl(
if (InsertPos) {
#ifndef NDEBUG
+ auto Args = SETraits::getTemplateArgs(Entry);
+ // Due to hash collisions, it can happen that we load another template
+ // specialization with the same hash. This is fine, as long as the next
+ // call to findSpecializationImpl does not find a matching Decl for the
+ // template arguments.
+ loadLazySpecializationsImpl(Args);
void *CorrectInsertPos;
- assert(!findSpecializationImpl(Specializations,
- CorrectInsertPos,
- SETraits::getTemplateArgs(Entry)) &&
+ assert(!findSpecializationImpl(Specializations, CorrectInsertPos, Args) &&
InsertPos == CorrectInsertPos &&
"given incorrect InsertPos for specialization");
#endif
@@ -453,12 +488,14 @@ FunctionTemplateDecl::getSpecializations() const {
FunctionDecl *
FunctionTemplateDecl::findSpecialization(ArrayRef<TemplateArgument> Args,
void *&InsertPos) {
- return findSpecializationImpl(getSpecializations(), InsertPos, Args);
+ auto *Common = getCommonPtr();
+ return findSpecializationImpl(Common->Specializations, InsertPos, Args);
}
void FunctionTemplateDecl::addSpecialization(
FunctionTemplateSpecializationInfo *Info, void *InsertPos) {
- addSpecializationImpl<FunctionTemplateDecl>(getSpecializations(), Info,
+ auto *Common = getCommonPtr();
+ addSpecializationImpl<FunctionTemplateDecl>(Common->Specializations, Info,
InsertPos);
}
@@ -516,8 +553,9 @@ ClassTemplateDecl
*ClassTemplateDecl::CreateDeserialized(ASTContext &C,
DeclarationName(), nullptr, nullptr);
}
-void ClassTemplateDecl::LoadLazySpecializations() const {
- loadLazySpecializationsImpl();
+void ClassTemplateDecl::LoadLazySpecializations(
+ bool OnlyPartial /*=false*/) const {
+ loadLazySpecializationsImpl(OnlyPartial);
}
llvm::FoldingSetVector<ClassTemplateSpecializationDecl> &
@@ -528,7 +566,7 @@ ClassTemplateDecl::getSpecializations() const {
llvm::FoldingSetVector<ClassTemplatePartialSpecializationDecl> &
ClassTemplateDecl::getPartialSpecializations() const {
- LoadLazySpecializations();
+ LoadLazySpecializations(/*PartialOnly = */ true);
return getCommonPtr()->PartialSpecializations;
}
@@ -542,12 +580,15 @@ ClassTemplateDecl::newCommon(ASTContext &C) const {
ClassTemplateSpecializationDecl *
ClassTemplateDecl::findSpecialization(ArrayRef<TemplateArgument> Args,
void *&InsertPos) {
- return findSpecializationImpl(getSpecializations(), InsertPos, Args);
+ auto *Common = getCommonPtr();
+ return findSpecializationImpl(Common->Specializations, InsertPos, Args);
}
void ClassTemplateDecl::AddSpecialization(ClassTemplateSpecializationDecl *D,
void *InsertPos) {
- addSpecializationImpl<ClassTemplateDecl>(getSpecializations(), D, InsertPos);
+ auto *Common = getCommonPtr();
+ addSpecializationImpl<ClassTemplateDecl>(Common->Specializations, D,
+ InsertPos);
}
ClassTemplatePartialSpecializationDecl *
@@ -904,6 +945,14 @@ 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,
@@ -1283,8 +1332,9 @@ VarTemplateDecl
*VarTemplateDecl::CreateDeserialized(ASTContext &C,
DeclarationName(), nullptr, nullptr);
}
-void VarTemplateDecl::LoadLazySpecializations() const {
- loadLazySpecializationsImpl();
+void VarTemplateDecl::LoadLazySpecializations(
+ bool OnlyPartial /*=false*/) const {
+ loadLazySpecializationsImpl(OnlyPartial);
}
llvm::FoldingSetVector<VarTemplateSpecializationDecl> &
@@ -1295,7 +1345,7 @@ VarTemplateDecl::getSpecializations() const {
llvm::FoldingSetVector<VarTemplatePartialSpecializationDecl> &
VarTemplateDecl::getPartialSpecializations() const {
- LoadLazySpecializations();
+ LoadLazySpecializations(/*PartialOnly = */ true);
return getCommonPtr()->PartialSpecializations;
}
@@ -1309,12 +1359,14 @@ VarTemplateDecl::newCommon(ASTContext &C) const {
VarTemplateSpecializationDecl *
VarTemplateDecl::findSpecialization(ArrayRef<TemplateArgument> Args,
void *&InsertPos) {
- return findSpecializationImpl(getSpecializations(), InsertPos, Args);
+ auto *Common = getCommonPtr();
+ return findSpecializationImpl(Common->Specializations, InsertPos, Args);
}
void VarTemplateDecl::AddSpecialization(VarTemplateSpecializationDecl *D,
void *InsertPos) {
- addSpecializationImpl<VarTemplateDecl>(getSpecializations(), D, InsertPos);
+ auto *Common = getCommonPtr();
+ addSpecializationImpl<VarTemplateDecl>(Common->Specializations, D,
InsertPos);
}
VarTemplatePartialSpecializationDecl *
diff --git a/clang/lib/AST/ODRHash.cpp b/clang/lib/AST/ODRHash.cpp
index 1929314363817a..a8a3a5200d61ed 100644
--- a/clang/lib/AST/ODRHash.cpp
+++ b/clang/lib/AST/ODRHash.cpp
@@ -828,6 +828,21 @@ void ODRHash::AddDecl(const Decl *D) {
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).
+ 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))
+ if (FD->getTemplateSpecializationArgs())
+ Args = FD->getTemplateSpecializationArgs()->asArray();
+
+ for (auto &TA : Args)
+ AddTemplateArgument(TA);
}
namespace {
diff --git a/clang/lib/Serialization/ASTReader.cpp
b/clang/lib/Serialization/ASTReader.cpp
index 1b2473f2457344..c1696cd6fae32e 100644
--- a/clang/lib/Serialization/ASTReader.cpp
+++ b/clang/lib/Serialization/ASTReader.cpp
@@ -7657,14 +7657,23 @@ void ASTReader::CompleteRedeclChain(const Decl *D) {
}
}
- if (auto *CTSD = dyn_cast<ClassTemplateSpecializationDecl>(D))
- CTSD->getSpecializedTemplate()->LoadLazySpecializations();
- if (auto *VTSD = dyn_cast<VarTemplateSpecializationDecl>(D))
- VTSD->getSpecializedTemplate()->LoadLazySpecializations();
- if (auto *FD = dyn_cast<FunctionDecl>(D)) {
- if (auto *Template = FD->getPrimaryTemplate())
- Template->LoadLazySpecializations();
- }
+ RedeclarableTemplateDecl *Template = nullptr;
+ ArrayRef<TemplateArgument> Args;
+ if (auto *CTSD = dyn_cast<ClassTemplateSpecializationDecl>(D)) {
+ Template = CTSD->getSpecializedTemplate();
+ Args = CTSD->getTemplateArgs().asArray();
+ } else if (auto *VTSD = dyn_cast<VarTemplateSpecializationDecl>(D)) {
+ Template = VTSD->getSpecializedTemplate();
+ Args = VTSD->getTemplateArgs().asArray();
+ } else if (auto *FD = dyn_cast<FunctionDecl>(D)) {
+ if (auto *Tmplt = FD->getPrimaryTemplate()) {
+ Template = Tmplt;
+ Args = FD->getTemplateSpecializationArgs()->asArray();
+ }
+ }
+
+ if (Template)
+ Template->loadLazySpecializationsImpl(Args);
}
CXXCtorInitializer **
diff --git a/clang/lib/Serialization/ASTReaderDecl.cpp
b/clang/lib/Serialization/ASTReaderDecl.cpp
index 1ccc810f415eb4..ba8bfaf80547e2 100644
--- a/clang/lib/Serialization/ASTReaderDecl.cpp
+++ b/clang/lib/Serialization/ASTReaderDecl.cpp
@@ -187,9 +187,19 @@ class ASTDeclReader : public DeclVisitor<ASTDeclReader,
void> {
std::string readString() { return Record.readString(); }
- void readDeclIDList(SmallVectorImpl<GlobalDeclID> &IDs) {
+ using LazySpecializationInfo =
+ RedeclarableTemplateDecl::LazySpecializationInfo;
+
+ 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(readDeclID());
+ IDs.push_back(ReadLazySpecializationInfo());
}
Decl *readDecl() { return Record.readDecl(); }
@@ -285,7 +295,8 @@ class ASTDeclReader : public DeclVisitor<ASTDeclReader,
void> {
ThisDeclID(thisDeclID), ThisDeclLoc(ThisDeclLoc) {}
template <typename T>
- static void AddLazySpecializations(T *D, SmallVectorImpl<GlobalDeclID> &IDs)
{
+ static void
+ AddLazySpecializations(T *D, SmallVectorImpl<LazySpecializationInfo> &IDs) {
if (IDs.empty())
return;
@@ -295,14 +306,13 @@ class ASTDeclReader : public DeclVisitor<ASTDeclReader,
void> {
auto *&LazySpecializations = D->getCommonPtr()->LazySpecializations;
if (auto &Old = LazySpecializations) {
- IDs.insert(IDs.end(), Old + 1, Old + 1 + Old[0].getRawValue());
+ 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) GlobalDeclID[1 + IDs.size()];
- *Result = GlobalDeclID(IDs.size());
-
+ auto *Result = new (C)
+ RedeclarableTemplateDecl::LazySpecializationInfo[1 + IDs.size()];
+ Result->DeclID = GlobalDeclID(IDs.size());
std::copy(IDs.begin(), IDs.end(), Result + 1);
LazySpecializations = Result;
@@ -335,7 +345,9 @@ class ASTDeclReader : public DeclVisitor<ASTDeclReader,
void> {
void ReadFunctionDefinition(FunctionDecl *FD);
void Visit(Decl *D);
- void UpdateDecl(Decl *D, SmallVectorImpl<GlobalDeclID> &);
+ void UpdateDecl(
+ Decl *D,
+ SmallVectorImpl<RedeclarableTemplateDecl::LazySpecializationInfo> &);
static void setNextObjCCategory(ObjCCategoryDecl *Cat,
ObjCCategoryDecl *Next) {
@@ -2447,7 +2459,7 @@ 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<GlobalDeclID, 32> SpecIDs;
+ SmallVector<LazySpecializationInfo, 32> SpecIDs;
readDeclIDList(SpecIDs);
ASTDeclReader::AddLazySpecializations(D, SpecIDs);
}
@@ -2475,7 +2487,7 @@ 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<GlobalDeclID, 32> SpecIDs;
+ SmallVector<LazySpecializationInfo, 32> SpecIDs;
readDeclIDList(SpecIDs);
ASTDeclReader::AddLazySpecializations(D, SpecIDs);
}
@@ -2576,7 +2588,7 @@ void
ASTDeclReader::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) {
if (ThisDeclID == Redecl.getFirstID()) {
// This FunctionTemplateDecl owns a CommonPtr; read it.
- SmallVector<GlobalDeclID, 32> SpecIDs;
+ SmallVector<LazySpecializationInfo, 32> SpecIDs;
readDeclIDList(SpecIDs);
ASTDeclReader::AddLazySpecializations(D, SpecIDs);
}
@@ -4278,7 +4290,9 @@ void ASTReader::loadDeclUpdateRecords(PendingUpdateRecord
&Record) {
ProcessingUpdatesRAIIObj ProcessingUpdates(*this);
DeclUpdateOffsetsMap::iterator UpdI = DeclUpdateOffsets.find(ID);
- SmallVector<GlobalDeclID, 8> PendingLazySpecializationIDs;
+ using LazySpecializationInfo =
+ RedeclarableTemplateDecl::LazySpecializationInfo;
+ llvm::SmallVector<LazySpecializationInfo, 8> PendingLazySpecializationIDs;
if (UpdI != DeclUpdateOffsets.end()) {
auto UpdateOffsets = std::move(UpdI->second);
@@ -4555,7 +4569,7 @@ static void forAllLaterRedecls(DeclT *D, Fn F) {
void ASTDeclReader::UpdateDecl(
Decl *D,
- llvm::SmallVectorImpl<GlobalDeclID> &PendingLazySpecializationIDs) {
+ SmallVectorImpl<LazySpecializationInfo> &PendingLazySpecializationIDs) {
while (Record.getIdx() < Record.size()) {
switch ((DeclUpdateKind)Record.readInt()) {
case UPD_CXX_ADDED_IMPLICIT_MEMBER: {
@@ -4568,7 +4582,7 @@ void ASTDeclReader::UpdateDecl(
case UPD_CXX_ADDED_TEMPLATE_SPECIALIZATION:
// It will be added to the template's lazy specialization set.
- PendingLazySpecializationIDs.push_back(readDeclID());
+ PendingLazySpecializationIDs.push_back(ReadLazySpecializationInfo());
break;
case UPD_CXX_ADDED_ANONYMOUS_NAMESPACE: {
diff --git a/clang/lib/Serialization/ASTWriter.cpp
b/clang/lib/Serialization/ASTWriter.cpp
index 938d7b525cb959..6185749c9a9de8 100644
--- a/clang/lib/Serialization/ASTWriter.cpp
+++ b/clang/lib/Serialization/ASTWriter.cpp
@@ -5811,12 +5811,29 @@ void ASTWriter::WriteDeclUpdatesBlocks(RecordDataImpl
&OffsetsRecord) {
switch (Kind) {
case UPD_CXX_ADDED_IMPLICIT_MEMBER:
- case UPD_CXX_ADDED_TEMPLATE_SPECIALIZATION:
case UPD_CXX_ADDED_ANONYMOUS_NAMESPACE:
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 f21cbd11b6ab89..e5ada3fdbb1c48 100644
--- a/clang/lib/Serialization/ASTWriterDecl.cpp
+++ b/clang/lib/Serialization/ASTWriterDecl.cpp
@@ -178,11 +178,12 @@ namespace clang {
Record.AddSourceLocation(typeParams->getRAngleLoc());
}
- /// Add to the record the first declaration from each module file that
- /// provides a declaration of D. The intent is to provide a sufficient
- /// set such that reloading this set will load all current redeclarations.
- void AddFirstDeclFromEachModule(const Decl *D, bool IncludeLocal) {
- llvm::MapVector<ModuleFile*, const Decl*> Firsts;
+ /// Collect the first declaration from each module file that provides a
+ /// declaration of D.
+ void CollectFirstDeclFromEachModule(
+ const Decl *D, bool IncludeLocal,
+ llvm::MapVector<ModuleFile *, const Decl *> &Firsts) {
+
// FIXME: We can skip entries that we know are implied by others.
for (const Decl *R = D->getMostRecentDecl(); R; R =
R->getPreviousDecl()) {
if (R->isFromASTFile())
@@ -190,10 +191,49 @@ namespace clang {
else if (IncludeLocal)
Firsts[nullptr] = R;
}
+ }
+
+ /// Add to the record the first declaration from each module file that
+ /// provides a declaration of D. The intent is to provide a sufficient
+ /// set such that reloading this set will load all current redeclarations.
+ void AddFirstDeclFromEachModule(const Decl *D, bool IncludeLocal) {
+ llvm::MapVector<ModuleFile *, const Decl *> Firsts;
+ CollectFirstDeclFromEachModule(D, IncludeLocal, Firsts);
+
for (const auto &F : Firsts)
Record.AddDeclRef(F.second);
}
+ /// Add to the record the first template specialization from each module
+ /// file that provides a declaration of D. We store the DeclId and an
+ /// ODRHash of the template arguments of D which should provide enough
+ /// information to load D only if the template instantiator needs it.
+ void AddFirstSpecializationDeclFromEachModule(const Decl *D,
+ bool IncludeLocal) {
+ assert(isa<ClassTemplateSpecializationDecl>(D) ||
+ isa<VarTemplateSpecializationDecl>(D) ||
+ isa<FunctionDecl>(D) && "Must not be called with other decls");
+ llvm::MapVector<ModuleFile *, const Decl *> Firsts;
+ CollectFirstDeclFromEachModule(D, IncludeLocal, Firsts);
+
+ for (const auto &F : Firsts) {
+ 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.
template <typename EntryType>
typename RedeclarableTemplateDecl::SpecEntryTraits<EntryType>::DeclType *
@@ -206,7 +246,8 @@ namespace clang {
decltype(T::PartialSpecializations) &getPartialSpecializations(T *Common) {
return Common->PartialSpecializations;
}
- ArrayRef<Decl> getPartialSpecializations(FunctionTemplateDecl::Common *) {
+ MutableArrayRef<FunctionTemplateSpecializationInfo>
+ getPartialSpecializations(FunctionTemplateDecl::Common *) {
return std::nullopt;
}
@@ -223,9 +264,12 @@ namespace clang {
assert(!Common->LazySpecializations);
}
- ArrayRef<GlobalDeclID> LazySpecializations;
+ using LazySpecializationInfo =
+ RedeclarableTemplateDecl::LazySpecializationInfo;
+ ArrayRef<LazySpecializationInfo> LazySpecializations;
if (auto *LS = Common->LazySpecializations)
- LazySpecializations = llvm::ArrayRef(LS + 1, LS[0].getRawValue());
+ LazySpecializations =
+ llvm::ArrayRef(LS + 1, LS[0].DeclID.getRawValue());
// Add a slot to the record for the number of specializations.
unsigned I = Record.size();
@@ -241,14 +285,20 @@ namespace clang {
for (auto *D : Specs) {
assert(D->isCanonicalDecl() && "non-canonical decl in set");
- AddFirstDeclFromEachModule(D, /*IncludeLocal*/true);
+ AddFirstSpecializationDeclFromEachModule(D, /*IncludeLocal*/ true);
+ }
+ for (auto &SpecInfo : LazySpecializations) {
+ Record.push_back(SpecInfo.DeclID.getRawValue());
+ Record.push_back(SpecInfo.ODRHash);
+ Record.push_back(SpecInfo.IsPartial);
}
- Record.append(
- DeclIDIterator<GlobalDeclID, DeclID>(LazySpecializations.begin()),
- DeclIDIterator<GlobalDeclID, DeclID>(LazySpecializations.end()));
- // Update the size entry we added earlier.
- Record[I] = Record.size() - I - 1;
+ // 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;
}
/// Ensure that this template specialization is associated with the
specified
diff --git a/clang/test/Modules/cxx-templates.cpp
b/clang/test/Modules/cxx-templates.cpp
index 44b02ad3ec748c..f0d38f1702549e 100644
--- a/clang/test/Modules/cxx-templates.cpp
+++ b/clang/test/Modules/cxx-templates.cpp
@@ -249,7 +249,7 @@ 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[2]'
+// CHECK-DUMP-NEXT: TemplateArgument type 'char[1]'
// CHECK-DUMP: ClassTemplateSpecializationDecl {{.*}} SomeTemplate
definition
// CHECK-DUMP-NEXT: DefinitionData
// CHECK-DUMP-NEXT: DefaultConstructor
@@ -258,9 +258,9 @@ namespace Std {
// CHECK-DUMP-NEXT: CopyAssignment
// CHECK-DUMP-NEXT: MoveAssignment
// CHECK-DUMP-NEXT: Destructor
-// CHECK-DUMP-NEXT: TemplateArgument type 'char[2]'
-// CHECK-DUMP: ClassTemplateSpecializationDecl {{.*}} prev {{.*}}
SomeTemplate
// CHECK-DUMP-NEXT: TemplateArgument type 'char[1]'
+// CHECK-DUMP: ClassTemplateSpecializationDecl {{.*}} prev {{.*}}
SomeTemplate
+// CHECK-DUMP-NEXT: TemplateArgument type 'char[2]'
// CHECK-DUMP: ClassTemplateSpecializationDecl {{.*}} SomeTemplate
definition
// CHECK-DUMP-NEXT: DefinitionData
// CHECK-DUMP-NEXT: DefaultConstructor
@@ -269,4 +269,4 @@ namespace Std {
// CHECK-DUMP-NEXT: CopyAssignment
// CHECK-DUMP-NEXT: MoveAssignment
// CHECK-DUMP-NEXT: Destructor
-// CHECK-DUMP-NEXT: TemplateArgument type 'char[1]'
+// CHECK-DUMP-NEXT: TemplateArgument type 'char[2]'
diff --git a/clang/test/Modules/odr_hash.cpp b/clang/test/Modules/odr_hash.cpp
index fa8b2c81ab46e1..7cea3af3f41bdd 100644
--- a/clang/test/Modules/odr_hash.cpp
+++ b/clang/test/Modules/odr_hash.cpp
@@ -3084,8 +3084,8 @@ struct S5 {
};
#else
S5 s5;
-// expected-error@second.h:* {{'PointersAndReferences::S5::x' from module
'SecondModule' is not present in definition of 'PointersAndReferences::S5' in
module 'FirstModule'}}
-// expected-note@first.h:* {{declaration of 'x' does not match}}
+// expected-error@first.h:* {{'PointersAndReferences::S5::x' from module
'FirstModule' is not present in definition of 'PointersAndReferences::S5' in
module 'SecondModule'}}
+// expected-note@second.h:* {{declaration of 'x' does not match}}
#endif
#if defined(FIRST)
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