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llvm-project/clang/lib/AST/DeclTemplate.cpp

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//===- DeclTemplate.cpp - Template Declaration AST Node Implementation ----===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the C++ related Decl classes for templates.
//
//===----------------------------------------------------------------------===//
#include "clang/AST/DeclTemplate.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/ASTMutationListener.h"
#include "clang/AST/DeclCXX.h"
#include "clang/AST/DeclarationName.h"
#include "clang/AST/Expr.h"
#include "clang/AST/TemplateBase.h"
#include "clang/AST/TemplateName.h"
#include "clang/AST/Type.h"
#include "clang/AST/TypeLoc.h"
#include "clang/Basic/Builtins.h"
#include "clang/Basic/LLVM.h"
#include "clang/Basic/SourceLocation.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/FoldingSet.h"
#include "llvm/ADT/None.h"
#include "llvm/ADT/PointerUnion.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/ErrorHandling.h"
#include <algorithm>
#include <cassert>
#include <cstdint>
#include <memory>
#include <utility>
using namespace clang;
//===----------------------------------------------------------------------===//
// TemplateParameterList Implementation
//===----------------------------------------------------------------------===//
TemplateParameterList::TemplateParameterList(SourceLocation TemplateLoc,
SourceLocation LAngleLoc,
ArrayRef<NamedDecl *> Params,
SourceLocation RAngleLoc,
Expr *RequiresClause)
: TemplateLoc(TemplateLoc), LAngleLoc(LAngleLoc), RAngleLoc(RAngleLoc),
NumParams(Params.size()), ContainsUnexpandedParameterPack(false),
HasRequiresClause(static_cast<bool>(RequiresClause)) {
for (unsigned Idx = 0; Idx < NumParams; ++Idx) {
NamedDecl *P = Params[Idx];
begin()[Idx] = P;
if (!P->isTemplateParameterPack()) {
if (NonTypeTemplateParmDecl *NTTP = dyn_cast<NonTypeTemplateParmDecl>(P))
if (NTTP->getType()->containsUnexpandedParameterPack())
ContainsUnexpandedParameterPack = true;
if (TemplateTemplateParmDecl *TTP = dyn_cast<TemplateTemplateParmDecl>(P))
if (TTP->getTemplateParameters()->containsUnexpandedParameterPack())
ContainsUnexpandedParameterPack = true;
// FIXME: If a default argument contains an unexpanded parameter pack, the
// template parameter list does too.
}
}
if (RequiresClause) {
*getTrailingObjects<Expr *>() = RequiresClause;
}
}
TemplateParameterList *
TemplateParameterList::Create(const ASTContext &C, SourceLocation TemplateLoc,
SourceLocation LAngleLoc,
ArrayRef<NamedDecl *> Params,
SourceLocation RAngleLoc, Expr *RequiresClause) {
void *Mem = C.Allocate(totalSizeToAlloc<NamedDecl *, Expr *>(
Params.size(), RequiresClause ? 1u : 0u),
alignof(TemplateParameterList));
return new (Mem) TemplateParameterList(TemplateLoc, LAngleLoc, Params,
RAngleLoc, RequiresClause);
}
unsigned TemplateParameterList::getMinRequiredArguments() const {
unsigned NumRequiredArgs = 0;
for (const NamedDecl *P : asArray()) {
if (P->isTemplateParameterPack()) {
if (const auto *NTTP = dyn_cast<NonTypeTemplateParmDecl>(P))
if (NTTP->isExpandedParameterPack()) {
NumRequiredArgs += NTTP->getNumExpansionTypes();
continue;
}
break;
}
if (const auto *TTP = dyn_cast<TemplateTypeParmDecl>(P)) {
if (TTP->hasDefaultArgument())
break;
} else if (const auto *NTTP = dyn_cast<NonTypeTemplateParmDecl>(P)) {
if (NTTP->hasDefaultArgument())
break;
} else if (cast<TemplateTemplateParmDecl>(P)->hasDefaultArgument())
break;
++NumRequiredArgs;
}
return NumRequiredArgs;
}
unsigned TemplateParameterList::getDepth() const {
if (size() == 0)
return 0;
const NamedDecl *FirstParm = getParam(0);
if (const TemplateTypeParmDecl *TTP
= dyn_cast<TemplateTypeParmDecl>(FirstParm))
return TTP->getDepth();
else if (const NonTypeTemplateParmDecl *NTTP
= dyn_cast<NonTypeTemplateParmDecl>(FirstParm))
return NTTP->getDepth();
else
return cast<TemplateTemplateParmDecl>(FirstParm)->getDepth();
}
static void AdoptTemplateParameterList(TemplateParameterList *Params,
DeclContext *Owner) {
for (NamedDecl *P : *Params) {
P->setDeclContext(Owner);
if (auto *TTP = dyn_cast<TemplateTemplateParmDecl>(P))
AdoptTemplateParameterList(TTP->getTemplateParameters(), Owner);
}
}
namespace clang {
void *allocateDefaultArgStorageChain(const ASTContext &C) {
return new (C) char[sizeof(void*) * 2];
}
} // namespace clang
//===----------------------------------------------------------------------===//
// RedeclarableTemplateDecl Implementation
//===----------------------------------------------------------------------===//
RedeclarableTemplateDecl::CommonBase *RedeclarableTemplateDecl::getCommonPtr() const {
if (Common)
return Common;
// Walk the previous-declaration chain until we either find a declaration
// with a common pointer or we run out of previous declarations.
SmallVector<const RedeclarableTemplateDecl *, 2> PrevDecls;
for (const RedeclarableTemplateDecl *Prev = getPreviousDecl(); Prev;
Prev = Prev->getPreviousDecl()) {
if (Prev->Common) {
Common = Prev->Common;
break;
}
PrevDecls.push_back(Prev);
}
// If we never found a common pointer, allocate one now.
if (!Common) {
// FIXME: If any of the declarations is from an AST file, we probably
// need an update record to add the common data.
Common = newCommon(getASTContext());
}
// Update any previous declarations we saw with the common pointer.
for (const RedeclarableTemplateDecl *Prev : PrevDecls)
Prev->Common = Common;
return Common;
}
template<class EntryType>
typename RedeclarableTemplateDecl::SpecEntryTraits<EntryType>::DeclType *
RedeclarableTemplateDecl::findSpecializationImpl(
llvm::FoldingSetVector<EntryType> &Specs, ArrayRef<TemplateArgument> Args,
void *&InsertPos) {
using SETraits = SpecEntryTraits<EntryType>;
llvm::FoldingSetNodeID ID;
EntryType::Profile(ID,Args, getASTContext());
EntryType *Entry = Specs.FindNodeOrInsertPos(ID, InsertPos);
return Entry ? SETraits::getDecl(Entry)->getMostRecentDecl() : nullptr;
}
template<class Derived, class EntryType>
void RedeclarableTemplateDecl::addSpecializationImpl(
llvm::FoldingSetVector<EntryType> &Specializations, EntryType *Entry,
void *InsertPos) {
using SETraits = SpecEntryTraits<EntryType>;
if (InsertPos) {
#ifndef NDEBUG
void *CorrectInsertPos;
assert(!findSpecializationImpl(Specializations,
SETraits::getTemplateArgs(Entry),
CorrectInsertPos) &&
InsertPos == CorrectInsertPos &&
"given incorrect InsertPos for specialization");
#endif
Specializations.InsertNode(Entry, InsertPos);
} else {
EntryType *Existing = Specializations.GetOrInsertNode(Entry);
(void)Existing;
assert(SETraits::getDecl(Existing)->isCanonicalDecl() &&
"non-canonical specialization?");
}
if (ASTMutationListener *L = getASTMutationListener())
L->AddedCXXTemplateSpecialization(cast<Derived>(this),
SETraits::getDecl(Entry));
}
//===----------------------------------------------------------------------===//
// FunctionTemplateDecl Implementation
//===----------------------------------------------------------------------===//
FunctionTemplateDecl *FunctionTemplateDecl::Create(ASTContext &C,
DeclContext *DC,
SourceLocation L,
DeclarationName Name,
TemplateParameterList *Params,
NamedDecl *Decl) {
AdoptTemplateParameterList(Params, cast<DeclContext>(Decl));
return new (C, DC) FunctionTemplateDecl(C, DC, L, Name, Params, Decl);
}
FunctionTemplateDecl *FunctionTemplateDecl::CreateDeserialized(ASTContext &C,
unsigned ID) {
return new (C, ID) FunctionTemplateDecl(C, nullptr, SourceLocation(),
DeclarationName(), nullptr, nullptr);
}
RedeclarableTemplateDecl::CommonBase *
FunctionTemplateDecl::newCommon(ASTContext &C) const {
Common *CommonPtr = new (C) Common;
C.addDestruction(CommonPtr);
return CommonPtr;
}
void FunctionTemplateDecl::LoadLazySpecializations() const {
// Grab the most recent declaration to ensure we've loaded any lazy
// redeclarations of this template.
//
// FIXME: Avoid walking the entire redeclaration chain here.
Common *CommonPtr = getMostRecentDecl()->getCommonPtr();
if (CommonPtr->LazySpecializations) {
ASTContext &Context = getASTContext();
uint32_t *Specs = CommonPtr->LazySpecializations;
CommonPtr->LazySpecializations = nullptr;
for (uint32_t I = 0, N = *Specs++; I != N; ++I)
(void)Context.getExternalSource()->GetExternalDecl(Specs[I]);
}
}
llvm::FoldingSetVector<FunctionTemplateSpecializationInfo> &
FunctionTemplateDecl::getSpecializations() const {
LoadLazySpecializations();
return getCommonPtr()->Specializations;
}
FunctionDecl *
FunctionTemplateDecl::findSpecialization(ArrayRef<TemplateArgument> Args,
void *&InsertPos) {
return findSpecializationImpl(getSpecializations(), Args, InsertPos);
}
void FunctionTemplateDecl::addSpecialization(
FunctionTemplateSpecializationInfo *Info, void *InsertPos) {
addSpecializationImpl<FunctionTemplateDecl>(getSpecializations(), Info,
InsertPos);
}
ArrayRef<TemplateArgument> FunctionTemplateDecl::getInjectedTemplateArgs() {
TemplateParameterList *Params = getTemplateParameters();
Common *CommonPtr = getCommonPtr();
if (!CommonPtr->InjectedArgs) {
auto &Context = getASTContext();
SmallVector<TemplateArgument, 16> TemplateArgs;
Context.getInjectedTemplateArgs(Params, TemplateArgs);
CommonPtr->InjectedArgs =
new (Context) TemplateArgument[TemplateArgs.size()];
std::copy(TemplateArgs.begin(), TemplateArgs.end(),
CommonPtr->InjectedArgs);
}
return llvm::makeArrayRef(CommonPtr->InjectedArgs, Params->size());
}
//===----------------------------------------------------------------------===//
// ClassTemplateDecl Implementation
//===----------------------------------------------------------------------===//
ClassTemplateDecl *ClassTemplateDecl::Create(ASTContext &C,
DeclContext *DC,
SourceLocation L,
DeclarationName Name,
TemplateParameterList *Params,
NamedDecl *Decl,
Expr *AssociatedConstraints) {
AdoptTemplateParameterList(Params, cast<DeclContext>(Decl));
if (!AssociatedConstraints) {
return new (C, DC) ClassTemplateDecl(C, DC, L, Name, Params, Decl);
}
ConstrainedTemplateDeclInfo *const CTDI = new (C) ConstrainedTemplateDeclInfo;
ClassTemplateDecl *const New =
new (C, DC) ClassTemplateDecl(CTDI, C, DC, L, Name, Params, Decl);
New->setAssociatedConstraints(AssociatedConstraints);
return New;
}
ClassTemplateDecl *ClassTemplateDecl::CreateDeserialized(ASTContext &C,
unsigned ID) {
return new (C, ID) ClassTemplateDecl(C, nullptr, SourceLocation(),
DeclarationName(), nullptr, nullptr);
}
void ClassTemplateDecl::LoadLazySpecializations() const {
// Grab the most recent declaration to ensure we've loaded any lazy
// redeclarations of this template.
//
// FIXME: Avoid walking the entire redeclaration chain here.
Common *CommonPtr = getMostRecentDecl()->getCommonPtr();
if (CommonPtr->LazySpecializations) {
ASTContext &Context = getASTContext();
uint32_t *Specs = CommonPtr->LazySpecializations;
CommonPtr->LazySpecializations = nullptr;
for (uint32_t I = 0, N = *Specs++; I != N; ++I)
(void)Context.getExternalSource()->GetExternalDecl(Specs[I]);
}
}
llvm::FoldingSetVector<ClassTemplateSpecializationDecl> &
ClassTemplateDecl::getSpecializations() const {
LoadLazySpecializations();
return getCommonPtr()->Specializations;
}
llvm::FoldingSetVector<ClassTemplatePartialSpecializationDecl> &
ClassTemplateDecl::getPartialSpecializations() {
LoadLazySpecializations();
return getCommonPtr()->PartialSpecializations;
}
RedeclarableTemplateDecl::CommonBase *
ClassTemplateDecl::newCommon(ASTContext &C) const {
Common *CommonPtr = new (C) Common;
C.addDestruction(CommonPtr);
return CommonPtr;
}
ClassTemplateSpecializationDecl *
ClassTemplateDecl::findSpecialization(ArrayRef<TemplateArgument> Args,
void *&InsertPos) {
return findSpecializationImpl(getSpecializations(), Args, InsertPos);
}
void ClassTemplateDecl::AddSpecialization(ClassTemplateSpecializationDecl *D,
void *InsertPos) {
addSpecializationImpl<ClassTemplateDecl>(getSpecializations(), D, InsertPos);
}
ClassTemplatePartialSpecializationDecl *
ClassTemplateDecl::findPartialSpecialization(ArrayRef<TemplateArgument> Args,
void *&InsertPos) {
return findSpecializationImpl(getPartialSpecializations(), Args, InsertPos);
}
void ClassTemplateDecl::AddPartialSpecialization(
ClassTemplatePartialSpecializationDecl *D,
void *InsertPos) {
if (InsertPos)
getPartialSpecializations().InsertNode(D, InsertPos);
else {
ClassTemplatePartialSpecializationDecl *Existing
= getPartialSpecializations().GetOrInsertNode(D);
(void)Existing;
assert(Existing->isCanonicalDecl() && "Non-canonical specialization?");
}
if (ASTMutationListener *L = getASTMutationListener())
L->AddedCXXTemplateSpecialization(this, D);
}
void ClassTemplateDecl::getPartialSpecializations(
SmallVectorImpl<ClassTemplatePartialSpecializationDecl *> &PS) {
llvm::FoldingSetVector<ClassTemplatePartialSpecializationDecl> &PartialSpecs
= getPartialSpecializations();
PS.clear();
PS.reserve(PartialSpecs.size());
for (ClassTemplatePartialSpecializationDecl &P : PartialSpecs)
PS.push_back(P.getMostRecentDecl());
}
ClassTemplatePartialSpecializationDecl *
ClassTemplateDecl::findPartialSpecialization(QualType T) {
ASTContext &Context = getASTContext();
for (ClassTemplatePartialSpecializationDecl &P :
getPartialSpecializations()) {
if (Context.hasSameType(P.getInjectedSpecializationType(), T))
return P.getMostRecentDecl();
}
return nullptr;
}
ClassTemplatePartialSpecializationDecl *
ClassTemplateDecl::findPartialSpecInstantiatedFromMember(
ClassTemplatePartialSpecializationDecl *D) {
Decl *DCanon = D->getCanonicalDecl();
for (ClassTemplatePartialSpecializationDecl &P : getPartialSpecializations()) {
if (P.getInstantiatedFromMember()->getCanonicalDecl() == DCanon)
return P.getMostRecentDecl();
}
return nullptr;
}
QualType
ClassTemplateDecl::getInjectedClassNameSpecialization() {
Common *CommonPtr = getCommonPtr();
if (!CommonPtr->InjectedClassNameType.isNull())
return CommonPtr->InjectedClassNameType;
// C++0x [temp.dep.type]p2:
// The template argument list of a primary template is a template argument
// list in which the nth template argument has the value of the nth template
// parameter of the class template. If the nth template parameter is a
// template parameter pack (14.5.3), the nth template argument is a pack
// expansion (14.5.3) whose pattern is the name of the template parameter
// pack.
ASTContext &Context = getASTContext();
TemplateParameterList *Params = getTemplateParameters();
SmallVector<TemplateArgument, 16> TemplateArgs;
Context.getInjectedTemplateArgs(Params, TemplateArgs);
CommonPtr->InjectedClassNameType
= Context.getTemplateSpecializationType(TemplateName(this),
TemplateArgs);
return CommonPtr->InjectedClassNameType;
}
//===----------------------------------------------------------------------===//
// TemplateTypeParm Allocation/Deallocation Method Implementations
//===----------------------------------------------------------------------===//
TemplateTypeParmDecl *
TemplateTypeParmDecl::Create(const ASTContext &C, DeclContext *DC,
SourceLocation KeyLoc, SourceLocation NameLoc,
unsigned D, unsigned P, IdentifierInfo *Id,
bool Typename, bool ParameterPack) {
TemplateTypeParmDecl *TTPDecl =
new (C, DC) TemplateTypeParmDecl(DC, KeyLoc, NameLoc, Id, Typename);
QualType TTPType = C.getTemplateTypeParmType(D, P, ParameterPack, TTPDecl);
TTPDecl->setTypeForDecl(TTPType.getTypePtr());
return TTPDecl;
}
TemplateTypeParmDecl *
TemplateTypeParmDecl::CreateDeserialized(const ASTContext &C, unsigned ID) {
return new (C, ID) TemplateTypeParmDecl(nullptr, SourceLocation(),
SourceLocation(), nullptr, false);
}
SourceLocation TemplateTypeParmDecl::getDefaultArgumentLoc() const {
return hasDefaultArgument()
? getDefaultArgumentInfo()->getTypeLoc().getBeginLoc()
: SourceLocation();
}
SourceRange TemplateTypeParmDecl::getSourceRange() const {
if (hasDefaultArgument() && !defaultArgumentWasInherited())
return SourceRange(getLocStart(),
getDefaultArgumentInfo()->getTypeLoc().getEndLoc());
else
return TypeDecl::getSourceRange();
}
unsigned TemplateTypeParmDecl::getDepth() const {
return getTypeForDecl()->getAs<TemplateTypeParmType>()->getDepth();
}
unsigned TemplateTypeParmDecl::getIndex() const {
return getTypeForDecl()->getAs<TemplateTypeParmType>()->getIndex();
}
bool TemplateTypeParmDecl::isParameterPack() const {
return getTypeForDecl()->getAs<TemplateTypeParmType>()->isParameterPack();
}
//===----------------------------------------------------------------------===//
// NonTypeTemplateParmDecl Method Implementations
//===----------------------------------------------------------------------===//
NonTypeTemplateParmDecl::NonTypeTemplateParmDecl(
DeclContext *DC, SourceLocation StartLoc, SourceLocation IdLoc, unsigned D,
unsigned P, IdentifierInfo *Id, QualType T, TypeSourceInfo *TInfo,
ArrayRef<QualType> ExpandedTypes, ArrayRef<TypeSourceInfo *> ExpandedTInfos)
: DeclaratorDecl(NonTypeTemplateParm, DC, IdLoc, Id, T, TInfo, StartLoc),
TemplateParmPosition(D, P), ParameterPack(true),
ExpandedParameterPack(true), NumExpandedTypes(ExpandedTypes.size()) {
if (!ExpandedTypes.empty() && !ExpandedTInfos.empty()) {
auto TypesAndInfos =
getTrailingObjects<std::pair<QualType, TypeSourceInfo *>>();
for (unsigned I = 0; I != NumExpandedTypes; ++I) {
new (&TypesAndInfos[I].first) QualType(ExpandedTypes[I]);
TypesAndInfos[I].second = ExpandedTInfos[I];
}
}
}
NonTypeTemplateParmDecl *
NonTypeTemplateParmDecl::Create(const ASTContext &C, DeclContext *DC,
SourceLocation StartLoc, SourceLocation IdLoc,
unsigned D, unsigned P, IdentifierInfo *Id,
QualType T, bool ParameterPack,
TypeSourceInfo *TInfo) {
return new (C, DC) NonTypeTemplateParmDecl(DC, StartLoc, IdLoc, D, P, Id,
T, ParameterPack, TInfo);
}
NonTypeTemplateParmDecl *NonTypeTemplateParmDecl::Create(
const ASTContext &C, DeclContext *DC, SourceLocation StartLoc,
SourceLocation IdLoc, unsigned D, unsigned P, IdentifierInfo *Id,
QualType T, TypeSourceInfo *TInfo, ArrayRef<QualType> ExpandedTypes,
ArrayRef<TypeSourceInfo *> ExpandedTInfos) {
return new (C, DC,
additionalSizeToAlloc<std::pair<QualType, TypeSourceInfo *>>(
ExpandedTypes.size()))
NonTypeTemplateParmDecl(DC, StartLoc, IdLoc, D, P, Id, T, TInfo,
ExpandedTypes, ExpandedTInfos);
}
NonTypeTemplateParmDecl *
NonTypeTemplateParmDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
return new (C, ID) NonTypeTemplateParmDecl(nullptr, SourceLocation(),
SourceLocation(), 0, 0, nullptr,
QualType(), false, nullptr);
}
NonTypeTemplateParmDecl *
NonTypeTemplateParmDecl::CreateDeserialized(ASTContext &C, unsigned ID,
unsigned NumExpandedTypes) {
auto *NTTP =
new (C, ID, additionalSizeToAlloc<std::pair<QualType, TypeSourceInfo *>>(
NumExpandedTypes))
NonTypeTemplateParmDecl(nullptr, SourceLocation(), SourceLocation(),
0, 0, nullptr, QualType(), nullptr, None,
None);
NTTP->NumExpandedTypes = NumExpandedTypes;
return NTTP;
}
SourceRange NonTypeTemplateParmDecl::getSourceRange() const {
if (hasDefaultArgument() && !defaultArgumentWasInherited())
return SourceRange(getOuterLocStart(),
getDefaultArgument()->getSourceRange().getEnd());
return DeclaratorDecl::getSourceRange();
}
SourceLocation NonTypeTemplateParmDecl::getDefaultArgumentLoc() const {
return hasDefaultArgument()
? getDefaultArgument()->getSourceRange().getBegin()
: SourceLocation();
}
//===----------------------------------------------------------------------===//
// TemplateTemplateParmDecl Method Implementations
//===----------------------------------------------------------------------===//
void TemplateTemplateParmDecl::anchor() {}
TemplateTemplateParmDecl::TemplateTemplateParmDecl(
DeclContext *DC, SourceLocation L, unsigned D, unsigned P,
IdentifierInfo *Id, TemplateParameterList *Params,
ArrayRef<TemplateParameterList *> Expansions)
: TemplateDecl(TemplateTemplateParm, DC, L, Id, Params),
TemplateParmPosition(D, P), ParameterPack(true),
ExpandedParameterPack(true), NumExpandedParams(Expansions.size()) {
if (!Expansions.empty())
std::uninitialized_copy(Expansions.begin(), Expansions.end(),
getTrailingObjects<TemplateParameterList *>());
}
TemplateTemplateParmDecl *
TemplateTemplateParmDecl::Create(const ASTContext &C, DeclContext *DC,
SourceLocation L, unsigned D, unsigned P,
bool ParameterPack, IdentifierInfo *Id,
TemplateParameterList *Params) {
return new (C, DC) TemplateTemplateParmDecl(DC, L, D, P, ParameterPack, Id,
Params);
}
TemplateTemplateParmDecl *
TemplateTemplateParmDecl::Create(const ASTContext &C, DeclContext *DC,
SourceLocation L, unsigned D, unsigned P,
IdentifierInfo *Id,
TemplateParameterList *Params,
ArrayRef<TemplateParameterList *> Expansions) {
return new (C, DC,
additionalSizeToAlloc<TemplateParameterList *>(Expansions.size()))
TemplateTemplateParmDecl(DC, L, D, P, Id, Params, Expansions);
}
TemplateTemplateParmDecl *
TemplateTemplateParmDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
return new (C, ID) TemplateTemplateParmDecl(nullptr, SourceLocation(), 0, 0,
false, nullptr, nullptr);
}
TemplateTemplateParmDecl *
TemplateTemplateParmDecl::CreateDeserialized(ASTContext &C, unsigned ID,
unsigned NumExpansions) {
auto *TTP =
new (C, ID, additionalSizeToAlloc<TemplateParameterList *>(NumExpansions))
TemplateTemplateParmDecl(nullptr, SourceLocation(), 0, 0, nullptr,
nullptr, None);
TTP->NumExpandedParams = NumExpansions;
return TTP;
}
SourceLocation TemplateTemplateParmDecl::getDefaultArgumentLoc() const {
return hasDefaultArgument() ? getDefaultArgument().getLocation()
: SourceLocation();
}
void TemplateTemplateParmDecl::setDefaultArgument(
const ASTContext &C, const TemplateArgumentLoc &DefArg) {
if (DefArg.getArgument().isNull())
DefaultArgument.set(nullptr);
else
DefaultArgument.set(new (C) TemplateArgumentLoc(DefArg));
}
//===----------------------------------------------------------------------===//
// TemplateArgumentList Implementation
//===----------------------------------------------------------------------===//
TemplateArgumentList::TemplateArgumentList(ArrayRef<TemplateArgument> Args)
: Arguments(getTrailingObjects<TemplateArgument>()),
NumArguments(Args.size()) {
std::uninitialized_copy(Args.begin(), Args.end(),
getTrailingObjects<TemplateArgument>());
}
TemplateArgumentList *
TemplateArgumentList::CreateCopy(ASTContext &Context,
ArrayRef<TemplateArgument> Args) {
void *Mem = Context.Allocate(totalSizeToAlloc<TemplateArgument>(Args.size()));
return new (Mem) TemplateArgumentList(Args);
}
FunctionTemplateSpecializationInfo *
FunctionTemplateSpecializationInfo::Create(ASTContext &C, FunctionDecl *FD,
FunctionTemplateDecl *Template,
TemplateSpecializationKind TSK,
const TemplateArgumentList *TemplateArgs,
const TemplateArgumentListInfo *TemplateArgsAsWritten,
SourceLocation POI) {
const ASTTemplateArgumentListInfo *ArgsAsWritten = nullptr;
if (TemplateArgsAsWritten)
ArgsAsWritten = ASTTemplateArgumentListInfo::Create(C,
*TemplateArgsAsWritten);
return new (C) FunctionTemplateSpecializationInfo(FD, Template, TSK,
TemplateArgs,
ArgsAsWritten,
POI);
}
//===----------------------------------------------------------------------===//
// TemplateDecl Implementation
//===----------------------------------------------------------------------===//
void TemplateDecl::anchor() {}
//===----------------------------------------------------------------------===//
// ClassTemplateSpecializationDecl Implementation
//===----------------------------------------------------------------------===//
ClassTemplateSpecializationDecl::
ClassTemplateSpecializationDecl(ASTContext &Context, Kind DK, TagKind TK,
DeclContext *DC, SourceLocation StartLoc,
SourceLocation IdLoc,
ClassTemplateDecl *SpecializedTemplate,
ArrayRef<TemplateArgument> Args,
ClassTemplateSpecializationDecl *PrevDecl)
: CXXRecordDecl(DK, TK, Context, DC, StartLoc, IdLoc,
SpecializedTemplate->getIdentifier(), PrevDecl),
SpecializedTemplate(SpecializedTemplate),
TemplateArgs(TemplateArgumentList::CreateCopy(Context, Args)),
SpecializationKind(TSK_Undeclared) {
}
ClassTemplateSpecializationDecl::ClassTemplateSpecializationDecl(ASTContext &C,
Kind DK)
: CXXRecordDecl(DK, TTK_Struct, C, nullptr, SourceLocation(),
SourceLocation(), nullptr, nullptr),
SpecializationKind(TSK_Undeclared) {}
ClassTemplateSpecializationDecl *
ClassTemplateSpecializationDecl::Create(ASTContext &Context, TagKind TK,
DeclContext *DC,
SourceLocation StartLoc,
SourceLocation IdLoc,
ClassTemplateDecl *SpecializedTemplate,
ArrayRef<TemplateArgument> Args,
ClassTemplateSpecializationDecl *PrevDecl) {
ClassTemplateSpecializationDecl *Result =
new (Context, DC) ClassTemplateSpecializationDecl(
Context, ClassTemplateSpecialization, TK, DC, StartLoc, IdLoc,
SpecializedTemplate, Args, PrevDecl);
Result->MayHaveOutOfDateDef = false;
Context.getTypeDeclType(Result, PrevDecl);
return Result;
}
ClassTemplateSpecializationDecl *
ClassTemplateSpecializationDecl::CreateDeserialized(ASTContext &C,
unsigned ID) {
ClassTemplateSpecializationDecl *Result =
new (C, ID) ClassTemplateSpecializationDecl(C, ClassTemplateSpecialization);
Result->MayHaveOutOfDateDef = false;
return Result;
}
void ClassTemplateSpecializationDecl::getNameForDiagnostic(
raw_ostream &OS, const PrintingPolicy &Policy, bool Qualified) const {
NamedDecl::getNameForDiagnostic(OS, Policy, Qualified);
auto *PS = dyn_cast<ClassTemplatePartialSpecializationDecl>(this);
if (const ASTTemplateArgumentListInfo *ArgsAsWritten =
PS ? PS->getTemplateArgsAsWritten() : nullptr) {
printTemplateArgumentList(OS, ArgsAsWritten->arguments(), Policy);
} else {
const TemplateArgumentList &TemplateArgs = getTemplateArgs();
printTemplateArgumentList(OS, TemplateArgs.asArray(), Policy);
}
}
ClassTemplateDecl *
ClassTemplateSpecializationDecl::getSpecializedTemplate() const {
if (SpecializedPartialSpecialization *PartialSpec
= SpecializedTemplate.dyn_cast<SpecializedPartialSpecialization*>())
return PartialSpec->PartialSpecialization->getSpecializedTemplate();
return SpecializedTemplate.get<ClassTemplateDecl*>();
}
SourceRange
ClassTemplateSpecializationDecl::getSourceRange() const {
if (ExplicitInfo) {
SourceLocation Begin = getTemplateKeywordLoc();
if (Begin.isValid()) {
// Here we have an explicit (partial) specialization or instantiation.
assert(getSpecializationKind() == TSK_ExplicitSpecialization ||
getSpecializationKind() == TSK_ExplicitInstantiationDeclaration ||
getSpecializationKind() == TSK_ExplicitInstantiationDefinition);
if (getExternLoc().isValid())
Begin = getExternLoc();
SourceLocation End = getBraceRange().getEnd();
if (End.isInvalid())
End = getTypeAsWritten()->getTypeLoc().getEndLoc();
return SourceRange(Begin, End);
}
// An implicit instantiation of a class template partial specialization
// uses ExplicitInfo to record the TypeAsWritten, but the source
// locations should be retrieved from the instantiation pattern.
using CTPSDecl = ClassTemplatePartialSpecializationDecl;
CTPSDecl *ctpsd = const_cast<CTPSDecl*>(cast<CTPSDecl>(this));
CTPSDecl *inst_from = ctpsd->getInstantiatedFromMember();
assert(inst_from != nullptr);
return inst_from->getSourceRange();
}
else {
// No explicit info available.
llvm::PointerUnion<ClassTemplateDecl *,
ClassTemplatePartialSpecializationDecl *>
inst_from = getInstantiatedFrom();
if (inst_from.isNull())
return getSpecializedTemplate()->getSourceRange();
if (ClassTemplateDecl *ctd = inst_from.dyn_cast<ClassTemplateDecl*>())
return ctd->getSourceRange();
return inst_from.get<ClassTemplatePartialSpecializationDecl*>()
->getSourceRange();
}
}
//===----------------------------------------------------------------------===//
// ClassTemplatePartialSpecializationDecl Implementation
//===----------------------------------------------------------------------===//
void ClassTemplatePartialSpecializationDecl::anchor() {}
ClassTemplatePartialSpecializationDecl::
ClassTemplatePartialSpecializationDecl(ASTContext &Context, TagKind TK,
DeclContext *DC,
SourceLocation StartLoc,
SourceLocation IdLoc,
TemplateParameterList *Params,
ClassTemplateDecl *SpecializedTemplate,
ArrayRef<TemplateArgument> Args,
const ASTTemplateArgumentListInfo *ArgInfos,
ClassTemplatePartialSpecializationDecl *PrevDecl)
: ClassTemplateSpecializationDecl(Context,
ClassTemplatePartialSpecialization,
TK, DC, StartLoc, IdLoc,
SpecializedTemplate, Args, PrevDecl),
TemplateParams(Params), ArgsAsWritten(ArgInfos),
InstantiatedFromMember(nullptr, false) {
AdoptTemplateParameterList(Params, this);
}
ClassTemplatePartialSpecializationDecl *
ClassTemplatePartialSpecializationDecl::
Create(ASTContext &Context, TagKind TK,DeclContext *DC,
SourceLocation StartLoc, SourceLocation IdLoc,
TemplateParameterList *Params,
ClassTemplateDecl *SpecializedTemplate,
ArrayRef<TemplateArgument> Args,
const TemplateArgumentListInfo &ArgInfos,
QualType CanonInjectedType,
ClassTemplatePartialSpecializationDecl *PrevDecl) {
const ASTTemplateArgumentListInfo *ASTArgInfos =
ASTTemplateArgumentListInfo::Create(Context, ArgInfos);
ClassTemplatePartialSpecializationDecl *Result = new (Context, DC)
ClassTemplatePartialSpecializationDecl(Context, TK, DC, StartLoc, IdLoc,
Params, SpecializedTemplate, Args,
ASTArgInfos, PrevDecl);
Result->setSpecializationKind(TSK_ExplicitSpecialization);
Result->MayHaveOutOfDateDef = false;
Context.getInjectedClassNameType(Result, CanonInjectedType);
return Result;
}
ClassTemplatePartialSpecializationDecl *
ClassTemplatePartialSpecializationDecl::CreateDeserialized(ASTContext &C,
unsigned ID) {
ClassTemplatePartialSpecializationDecl *Result =
new (C, ID) ClassTemplatePartialSpecializationDecl(C);
Result->MayHaveOutOfDateDef = false;
return Result;
}
//===----------------------------------------------------------------------===//
// FriendTemplateDecl Implementation
//===----------------------------------------------------------------------===//
void FriendTemplateDecl::anchor() {}
FriendTemplateDecl *
FriendTemplateDecl::Create(ASTContext &Context, DeclContext *DC,
SourceLocation L,
MutableArrayRef<TemplateParameterList *> Params,
FriendUnion Friend, SourceLocation FLoc) {
return new (Context, DC) FriendTemplateDecl(DC, L, Params, Friend, FLoc);
}
FriendTemplateDecl *FriendTemplateDecl::CreateDeserialized(ASTContext &C,
unsigned ID) {
return new (C, ID) FriendTemplateDecl(EmptyShell());
}
//===----------------------------------------------------------------------===//
// TypeAliasTemplateDecl Implementation
//===----------------------------------------------------------------------===//
TypeAliasTemplateDecl *TypeAliasTemplateDecl::Create(ASTContext &C,
DeclContext *DC,
SourceLocation L,
DeclarationName Name,
TemplateParameterList *Params,
NamedDecl *Decl) {
AdoptTemplateParameterList(Params, DC);
return new (C, DC) TypeAliasTemplateDecl(C, DC, L, Name, Params, Decl);
}
TypeAliasTemplateDecl *TypeAliasTemplateDecl::CreateDeserialized(ASTContext &C,
unsigned ID) {
return new (C, ID) TypeAliasTemplateDecl(C, nullptr, SourceLocation(),
DeclarationName(), nullptr, nullptr);
}
RedeclarableTemplateDecl::CommonBase *
TypeAliasTemplateDecl::newCommon(ASTContext &C) const {
Common *CommonPtr = new (C) Common;
C.addDestruction(CommonPtr);
return CommonPtr;
}
//===----------------------------------------------------------------------===//
// ClassScopeFunctionSpecializationDecl Implementation
//===----------------------------------------------------------------------===//
void ClassScopeFunctionSpecializationDecl::anchor() {}
ClassScopeFunctionSpecializationDecl *
ClassScopeFunctionSpecializationDecl::CreateDeserialized(ASTContext &C,
unsigned ID) {
return new (C, ID) ClassScopeFunctionSpecializationDecl(
nullptr, SourceLocation(), nullptr, false, TemplateArgumentListInfo());
}
//===----------------------------------------------------------------------===//
// VarTemplateDecl Implementation
//===----------------------------------------------------------------------===//
VarTemplateDecl *VarTemplateDecl::getDefinition() {
VarTemplateDecl *CurD = this;
while (CurD) {
if (CurD->isThisDeclarationADefinition())
return CurD;
CurD = CurD->getPreviousDecl();
}
return nullptr;
}
VarTemplateDecl *VarTemplateDecl::Create(ASTContext &C, DeclContext *DC,
SourceLocation L, DeclarationName Name,
TemplateParameterList *Params,
VarDecl *Decl) {
return new (C, DC) VarTemplateDecl(C, DC, L, Name, Params, Decl);
}
VarTemplateDecl *VarTemplateDecl::CreateDeserialized(ASTContext &C,
unsigned ID) {
return new (C, ID) VarTemplateDecl(C, nullptr, SourceLocation(),
DeclarationName(), nullptr, nullptr);
}
// TODO: Unify across class, function and variable templates?
// May require moving this and Common to RedeclarableTemplateDecl.
void VarTemplateDecl::LoadLazySpecializations() const {
// Grab the most recent declaration to ensure we've loaded any lazy
// redeclarations of this template.
//
// FIXME: Avoid walking the entire redeclaration chain here.
Common *CommonPtr = getMostRecentDecl()->getCommonPtr();
if (CommonPtr->LazySpecializations) {
ASTContext &Context = getASTContext();
uint32_t *Specs = CommonPtr->LazySpecializations;
CommonPtr->LazySpecializations = nullptr;
for (uint32_t I = 0, N = *Specs++; I != N; ++I)
(void)Context.getExternalSource()->GetExternalDecl(Specs[I]);
}
}
llvm::FoldingSetVector<VarTemplateSpecializationDecl> &
VarTemplateDecl::getSpecializations() const {
LoadLazySpecializations();
return getCommonPtr()->Specializations;
}
llvm::FoldingSetVector<VarTemplatePartialSpecializationDecl> &
VarTemplateDecl::getPartialSpecializations() {
LoadLazySpecializations();
return getCommonPtr()->PartialSpecializations;
}
RedeclarableTemplateDecl::CommonBase *
VarTemplateDecl::newCommon(ASTContext &C) const {
Common *CommonPtr = new (C) Common;
C.addDestruction(CommonPtr);
return CommonPtr;
}
VarTemplateSpecializationDecl *
VarTemplateDecl::findSpecialization(ArrayRef<TemplateArgument> Args,
void *&InsertPos) {
return findSpecializationImpl(getSpecializations(), Args, InsertPos);
}
void VarTemplateDecl::AddSpecialization(VarTemplateSpecializationDecl *D,
void *InsertPos) {
addSpecializationImpl<VarTemplateDecl>(getSpecializations(), D, InsertPos);
}
VarTemplatePartialSpecializationDecl *
VarTemplateDecl::findPartialSpecialization(ArrayRef<TemplateArgument> Args,
void *&InsertPos) {
return findSpecializationImpl(getPartialSpecializations(), Args, InsertPos);
}
void VarTemplateDecl::AddPartialSpecialization(
VarTemplatePartialSpecializationDecl *D, void *InsertPos) {
if (InsertPos)
getPartialSpecializations().InsertNode(D, InsertPos);
else {
VarTemplatePartialSpecializationDecl *Existing =
getPartialSpecializations().GetOrInsertNode(D);
(void)Existing;
assert(Existing->isCanonicalDecl() && "Non-canonical specialization?");
}
if (ASTMutationListener *L = getASTMutationListener())
L->AddedCXXTemplateSpecialization(this, D);
}
void VarTemplateDecl::getPartialSpecializations(
SmallVectorImpl<VarTemplatePartialSpecializationDecl *> &PS) {
llvm::FoldingSetVector<VarTemplatePartialSpecializationDecl> &PartialSpecs =
getPartialSpecializations();
PS.clear();
PS.reserve(PartialSpecs.size());
for (VarTemplatePartialSpecializationDecl &P : PartialSpecs)
PS.push_back(P.getMostRecentDecl());
}
VarTemplatePartialSpecializationDecl *
VarTemplateDecl::findPartialSpecInstantiatedFromMember(
VarTemplatePartialSpecializationDecl *D) {
Decl *DCanon = D->getCanonicalDecl();
for (VarTemplatePartialSpecializationDecl &P : getPartialSpecializations()) {
if (P.getInstantiatedFromMember()->getCanonicalDecl() == DCanon)
return P.getMostRecentDecl();
}
return nullptr;
}
//===----------------------------------------------------------------------===//
// VarTemplateSpecializationDecl Implementation
//===----------------------------------------------------------------------===//
VarTemplateSpecializationDecl::VarTemplateSpecializationDecl(
Kind DK, ASTContext &Context, DeclContext *DC, SourceLocation StartLoc,
SourceLocation IdLoc, VarTemplateDecl *SpecializedTemplate, QualType T,
TypeSourceInfo *TInfo, StorageClass S, ArrayRef<TemplateArgument> Args)
: VarDecl(DK, Context, DC, StartLoc, IdLoc,
SpecializedTemplate->getIdentifier(), T, TInfo, S),
SpecializedTemplate(SpecializedTemplate),
TemplateArgs(TemplateArgumentList::CreateCopy(Context, Args)),
SpecializationKind(TSK_Undeclared), IsCompleteDefinition(false) {}
VarTemplateSpecializationDecl::VarTemplateSpecializationDecl(Kind DK,
ASTContext &C)
: VarDecl(DK, C, nullptr, SourceLocation(), SourceLocation(), nullptr,
QualType(), nullptr, SC_None),
SpecializationKind(TSK_Undeclared), IsCompleteDefinition(false) {}
VarTemplateSpecializationDecl *VarTemplateSpecializationDecl::Create(
ASTContext &Context, DeclContext *DC, SourceLocation StartLoc,
SourceLocation IdLoc, VarTemplateDecl *SpecializedTemplate, QualType T,
TypeSourceInfo *TInfo, StorageClass S, ArrayRef<TemplateArgument> Args) {
return new (Context, DC) VarTemplateSpecializationDecl(
VarTemplateSpecialization, Context, DC, StartLoc, IdLoc,
SpecializedTemplate, T, TInfo, S, Args);
}
VarTemplateSpecializationDecl *
VarTemplateSpecializationDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
return new (C, ID)
VarTemplateSpecializationDecl(VarTemplateSpecialization, C);
}
void VarTemplateSpecializationDecl::getNameForDiagnostic(
raw_ostream &OS, const PrintingPolicy &Policy, bool Qualified) const {
NamedDecl::getNameForDiagnostic(OS, Policy, Qualified);
auto *PS = dyn_cast<VarTemplatePartialSpecializationDecl>(this);
if (const ASTTemplateArgumentListInfo *ArgsAsWritten =
PS ? PS->getTemplateArgsAsWritten() : nullptr) {
printTemplateArgumentList(OS, ArgsAsWritten->arguments(), Policy);
} else {
const TemplateArgumentList &TemplateArgs = getTemplateArgs();
printTemplateArgumentList(OS, TemplateArgs.asArray(), Policy);
}
}
VarTemplateDecl *VarTemplateSpecializationDecl::getSpecializedTemplate() const {
if (SpecializedPartialSpecialization *PartialSpec =
SpecializedTemplate.dyn_cast<SpecializedPartialSpecialization *>())
return PartialSpec->PartialSpecialization->getSpecializedTemplate();
return SpecializedTemplate.get<VarTemplateDecl *>();
}
void VarTemplateSpecializationDecl::setTemplateArgsInfo(
const TemplateArgumentListInfo &ArgsInfo) {
TemplateArgsInfo.setLAngleLoc(ArgsInfo.getLAngleLoc());
TemplateArgsInfo.setRAngleLoc(ArgsInfo.getRAngleLoc());
for (const TemplateArgumentLoc &Loc : ArgsInfo.arguments())
TemplateArgsInfo.addArgument(Loc);
}
//===----------------------------------------------------------------------===//
// VarTemplatePartialSpecializationDecl Implementation
//===----------------------------------------------------------------------===//
void VarTemplatePartialSpecializationDecl::anchor() {}
VarTemplatePartialSpecializationDecl::VarTemplatePartialSpecializationDecl(
ASTContext &Context, DeclContext *DC, SourceLocation StartLoc,
SourceLocation IdLoc, TemplateParameterList *Params,
VarTemplateDecl *SpecializedTemplate, QualType T, TypeSourceInfo *TInfo,
StorageClass S, ArrayRef<TemplateArgument> Args,
const ASTTemplateArgumentListInfo *ArgInfos)
: VarTemplateSpecializationDecl(VarTemplatePartialSpecialization, Context,
DC, StartLoc, IdLoc, SpecializedTemplate, T,
TInfo, S, Args),
TemplateParams(Params), ArgsAsWritten(ArgInfos),
InstantiatedFromMember(nullptr, false) {
// TODO: The template parameters should be in DC by now. Verify.
// AdoptTemplateParameterList(Params, DC);
}
VarTemplatePartialSpecializationDecl *
VarTemplatePartialSpecializationDecl::Create(
ASTContext &Context, DeclContext *DC, SourceLocation StartLoc,
SourceLocation IdLoc, TemplateParameterList *Params,
VarTemplateDecl *SpecializedTemplate, QualType T, TypeSourceInfo *TInfo,
StorageClass S, ArrayRef<TemplateArgument> Args,
const TemplateArgumentListInfo &ArgInfos) {
const ASTTemplateArgumentListInfo *ASTArgInfos
= ASTTemplateArgumentListInfo::Create(Context, ArgInfos);
VarTemplatePartialSpecializationDecl *Result =
new (Context, DC) VarTemplatePartialSpecializationDecl(
Context, DC, StartLoc, IdLoc, Params, SpecializedTemplate, T, TInfo,
S, Args, ASTArgInfos);
Result->setSpecializationKind(TSK_ExplicitSpecialization);
return Result;
}
VarTemplatePartialSpecializationDecl *
VarTemplatePartialSpecializationDecl::CreateDeserialized(ASTContext &C,
unsigned ID) {
return new (C, ID) VarTemplatePartialSpecializationDecl(C);
}
static TemplateParameterList *
createMakeIntegerSeqParameterList(const ASTContext &C, DeclContext *DC) {
// typename T
auto *T = TemplateTypeParmDecl::Create(
C, DC, SourceLocation(), SourceLocation(), /*Depth=*/1, /*Position=*/0,
/*Id=*/nullptr, /*Typename=*/true, /*ParameterPack=*/false);
T->setImplicit(true);
// T ...Ints
TypeSourceInfo *TI =
C.getTrivialTypeSourceInfo(QualType(T->getTypeForDecl(), 0));
auto *N = NonTypeTemplateParmDecl::Create(
C, DC, SourceLocation(), SourceLocation(), /*Depth=*/0, /*Position=*/1,
/*Id=*/nullptr, TI->getType(), /*ParameterPack=*/true, TI);
N->setImplicit(true);
// <typename T, T ...Ints>
NamedDecl *P[2] = {T, N};
auto *TPL = TemplateParameterList::Create(
C, SourceLocation(), SourceLocation(), P, SourceLocation(), nullptr);
// template <typename T, ...Ints> class IntSeq
auto *TemplateTemplateParm = TemplateTemplateParmDecl::Create(
C, DC, SourceLocation(), /*Depth=*/0, /*Position=*/0,
/*ParameterPack=*/false, /*Id=*/nullptr, TPL);
TemplateTemplateParm->setImplicit(true);
// typename T
auto *TemplateTypeParm = TemplateTypeParmDecl::Create(
C, DC, SourceLocation(), SourceLocation(), /*Depth=*/0, /*Position=*/1,
/*Id=*/nullptr, /*Typename=*/true, /*ParameterPack=*/false);
TemplateTypeParm->setImplicit(true);
// T N
TypeSourceInfo *TInfo = C.getTrivialTypeSourceInfo(
QualType(TemplateTypeParm->getTypeForDecl(), 0));
auto *NonTypeTemplateParm = NonTypeTemplateParmDecl::Create(
C, DC, SourceLocation(), SourceLocation(), /*Depth=*/0, /*Position=*/2,
/*Id=*/nullptr, TInfo->getType(), /*ParameterPack=*/false, TInfo);
NamedDecl *Params[] = {TemplateTemplateParm, TemplateTypeParm,
NonTypeTemplateParm};
// template <template <typename T, T ...Ints> class IntSeq, typename T, T N>
return TemplateParameterList::Create(C, SourceLocation(), SourceLocation(),
Params, SourceLocation(), nullptr);
}
static TemplateParameterList *
createTypePackElementParameterList(const ASTContext &C, DeclContext *DC) {
// std::size_t Index
TypeSourceInfo *TInfo = C.getTrivialTypeSourceInfo(C.getSizeType());
auto *Index = NonTypeTemplateParmDecl::Create(
C, DC, SourceLocation(), SourceLocation(), /*Depth=*/0, /*Position=*/0,
/*Id=*/nullptr, TInfo->getType(), /*ParameterPack=*/false, TInfo);
// typename ...T
auto *Ts = TemplateTypeParmDecl::Create(
C, DC, SourceLocation(), SourceLocation(), /*Depth=*/0, /*Position=*/1,
/*Id=*/nullptr, /*Typename=*/true, /*ParameterPack=*/true);
Ts->setImplicit(true);
// template <std::size_t Index, typename ...T>
NamedDecl *Params[] = {Index, Ts};
return TemplateParameterList::Create(C, SourceLocation(), SourceLocation(),
llvm::makeArrayRef(Params),
SourceLocation(), nullptr);
}
static TemplateParameterList *createBuiltinTemplateParameterList(
const ASTContext &C, DeclContext *DC, BuiltinTemplateKind BTK) {
switch (BTK) {
case BTK__make_integer_seq:
return createMakeIntegerSeqParameterList(C, DC);
case BTK__type_pack_element:
return createTypePackElementParameterList(C, DC);
}
llvm_unreachable("unhandled BuiltinTemplateKind!");
}
void BuiltinTemplateDecl::anchor() {}
BuiltinTemplateDecl::BuiltinTemplateDecl(const ASTContext &C, DeclContext *DC,
DeclarationName Name,
BuiltinTemplateKind BTK)
: TemplateDecl(BuiltinTemplate, DC, SourceLocation(), Name,
createBuiltinTemplateParameterList(C, DC, BTK)),
BTK(BTK) {}
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