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DeclTemplate.cpp
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DeclTemplate.cpp
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//===- DeclTemplate.cpp - Template Declaration AST Node Implementation ----===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// 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/ExternalASTSource.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/PointerUnion.h"
#include "llvm/ADT/STLExtras.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 <optional>
#include <utility>
using namespace clang;
//===----------------------------------------------------------------------===//
// TemplateParameterList Implementation
//===----------------------------------------------------------------------===//
TemplateParameterList::TemplateParameterList(const ASTContext& C,
SourceLocation TemplateLoc,
SourceLocation LAngleLoc,
ArrayRef<NamedDecl *> Params,
SourceLocation RAngleLoc,
Expr *RequiresClause)
: TemplateLoc(TemplateLoc), LAngleLoc(LAngleLoc), RAngleLoc(RAngleLoc),
NumParams(Params.size()), ContainsUnexpandedParameterPack(false),
HasRequiresClause(RequiresClause != nullptr),
HasConstrainedParameters(false) {
for (unsigned Idx = 0; Idx < NumParams; ++Idx) {
NamedDecl *P = Params[Idx];
begin()[Idx] = P;
bool IsPack = P->isTemplateParameterPack();
if (const auto *NTTP = dyn_cast<NonTypeTemplateParmDecl>(P)) {
if (!IsPack && NTTP->getType()->containsUnexpandedParameterPack())
ContainsUnexpandedParameterPack = true;
if (NTTP->hasPlaceholderTypeConstraint())
HasConstrainedParameters = true;
} else if (const auto *TTP = dyn_cast<TemplateTemplateParmDecl>(P)) {
if (!IsPack &&
TTP->getTemplateParameters()->containsUnexpandedParameterPack())
ContainsUnexpandedParameterPack = true;
} else if (const auto *TTP = dyn_cast<TemplateTypeParmDecl>(P)) {
if (const TypeConstraint *TC = TTP->getTypeConstraint()) {
if (TC->getImmediatelyDeclaredConstraint()
->containsUnexpandedParameterPack())
ContainsUnexpandedParameterPack = true;
}
if (TTP->hasTypeConstraint())
HasConstrainedParameters = true;
} else {
llvm_unreachable("unexpected template parameter type");
}
// FIXME: If a default argument contains an unexpanded parameter pack, the
// template parameter list does too.
}
if (HasRequiresClause) {
if (RequiresClause->containsUnexpandedParameterPack())
ContainsUnexpandedParameterPack = true;
*getTrailingObjects<Expr *>() = RequiresClause;
}
}
bool TemplateParameterList::containsUnexpandedParameterPack() const {
if (ContainsUnexpandedParameterPack)
return true;
if (!HasConstrainedParameters)
return false;
// An implicit constrained parameter might have had a use of an unexpanded
// pack added to it after the template parameter list was created. All
// implicit parameters are at the end of the parameter list.
for (const NamedDecl *Param : llvm::reverse(asArray())) {
if (!Param->isImplicit())
break;
if (const auto *TTP = dyn_cast<TemplateTypeParmDecl>(Param)) {
const auto *TC = TTP->getTypeConstraint();
if (TC && TC->getImmediatelyDeclaredConstraint()
->containsUnexpandedParameterPack())
return true;
}
}
return false;
}
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(C, TemplateLoc, LAngleLoc, Params,
RAngleLoc, RequiresClause);
}
void TemplateParameterList::Profile(llvm::FoldingSetNodeID &ID,
const ASTContext &C) const {
const Expr *RC = getRequiresClause();
ID.AddBoolean(RC != nullptr);
if (RC)
RC->Profile(ID, C, /*Canonical=*/true);
ID.AddInteger(size());
for (NamedDecl *D : *this) {
if (const auto *NTTP = dyn_cast<NonTypeTemplateParmDecl>(D)) {
ID.AddInteger(0);
ID.AddBoolean(NTTP->isParameterPack());
NTTP->getType().getCanonicalType().Profile(ID);
ID.AddBoolean(NTTP->hasPlaceholderTypeConstraint());
if (const Expr *E = NTTP->getPlaceholderTypeConstraint())
E->Profile(ID, C, /*Canonical=*/true);
continue;
}
if (const auto *TTP = dyn_cast<TemplateTypeParmDecl>(D)) {
ID.AddInteger(1);
ID.AddBoolean(TTP->isParameterPack());
ID.AddBoolean(TTP->hasTypeConstraint());
if (const TypeConstraint *TC = TTP->getTypeConstraint())
TC->getImmediatelyDeclaredConstraint()->Profile(ID, C,
/*Canonical=*/true);
continue;
}
const auto *TTP = cast<TemplateTemplateParmDecl>(D);
ID.AddInteger(2);
ID.AddBoolean(TTP->isParameterPack());
TTP->getTemplateParameters()->Profile(ID, C);
}
}
unsigned TemplateParameterList::getMinRequiredArguments() const {
unsigned NumRequiredArgs = 0;
for (const NamedDecl *P : asArray()) {
if (P->isTemplateParameterPack()) {
if (std::optional<unsigned> Expansions = getExpandedPackSize(P)) {
NumRequiredArgs += *Expansions;
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 auto *TTP = dyn_cast<TemplateTypeParmDecl>(FirstParm))
return TTP->getDepth();
else if (const auto *NTTP = dyn_cast<NonTypeTemplateParmDecl>(FirstParm))
return NTTP->getDepth();
else
return cast<TemplateTemplateParmDecl>(FirstParm)->getDepth();
}
static bool AdoptTemplateParameterList(TemplateParameterList *Params,
DeclContext *Owner) {
bool Invalid = false;
for (NamedDecl *P : *Params) {
P->setDeclContext(Owner);
if (const auto *TTP = dyn_cast<TemplateTemplateParmDecl>(P))
if (AdoptTemplateParameterList(TTP->getTemplateParameters(), Owner))
Invalid = true;
if (P->isInvalidDecl())
Invalid = true;
}
return Invalid;
}
void TemplateParameterList::
getAssociatedConstraints(llvm::SmallVectorImpl<const Expr *> &AC) const {
if (HasConstrainedParameters)
for (const NamedDecl *Param : *this) {
if (const auto *TTP = dyn_cast<TemplateTypeParmDecl>(Param)) {
if (const auto *TC = TTP->getTypeConstraint())
AC.push_back(TC->getImmediatelyDeclaredConstraint());
} else if (const auto *NTTP = dyn_cast<NonTypeTemplateParmDecl>(Param)) {
if (const Expr *E = NTTP->getPlaceholderTypeConstraint())
AC.push_back(E);
}
}
if (HasRequiresClause)
AC.push_back(getRequiresClause());
}
bool TemplateParameterList::hasAssociatedConstraints() const {
return HasRequiresClause || HasConstrainedParameters;
}
bool TemplateParameterList::shouldIncludeTypeForArgument(
const PrintingPolicy &Policy, const TemplateParameterList *TPL,
unsigned Idx) {
if (!TPL || Idx >= TPL->size() || Policy.AlwaysIncludeTypeForTemplateArgument)
return true;
const NamedDecl *TemplParam = TPL->getParam(Idx);
if (const auto *ParamValueDecl =
dyn_cast<NonTypeTemplateParmDecl>(TemplParam))
if (ParamValueDecl->getType()->getContainedDeducedType())
return true;
return false;
}
namespace clang {
void *allocateDefaultArgStorageChain(const ASTContext &C) {
return new (C) char[sizeof(void*) * 2];
}
} // namespace clang
//===----------------------------------------------------------------------===//
// TemplateDecl Implementation
//===----------------------------------------------------------------------===//
TemplateDecl::TemplateDecl(Kind DK, DeclContext *DC, SourceLocation L,
DeclarationName Name, TemplateParameterList *Params,
NamedDecl *Decl)
: NamedDecl(DK, DC, L, Name), TemplatedDecl(Decl), TemplateParams(Params) {}
void TemplateDecl::anchor() {}
void TemplateDecl::
getAssociatedConstraints(llvm::SmallVectorImpl<const Expr *> &AC) const {
TemplateParams->getAssociatedConstraints(AC);
if (auto *FD = dyn_cast_or_null<FunctionDecl>(getTemplatedDecl()))
if (const Expr *TRC = FD->getTrailingRequiresClause())
AC.push_back(TRC);
}
bool TemplateDecl::hasAssociatedConstraints() const {
if (TemplateParams->hasAssociatedConstraints())
return true;
if (auto *FD = dyn_cast_or_null<FunctionDecl>(getTemplatedDecl()))
return FD->getTrailingRequiresClause();
return false;
}
bool TemplateDecl::isTypeAlias() const {
switch (getKind()) {
case TemplateDecl::TypeAliasTemplate:
case TemplateDecl::BuiltinTemplate:
return true;
default:
return false;
};
}
//===----------------------------------------------------------------------===//
// RedeclarableTemplateDecl Implementation
//===----------------------------------------------------------------------===//
void RedeclarableTemplateDecl::anchor() {}
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;
}
void RedeclarableTemplateDecl::loadLazySpecializationsImpl() 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();
uint32_t *Specs = CommonBasePtr->LazySpecializations;
CommonBasePtr->LazySpecializations = nullptr;
for (uint32_t I = 0, N = *Specs++; I != N; ++I)
(void)Context.getExternalSource()->GetExternalDecl(Specs[I]);
}
}
template<class EntryType, typename... ProfileArguments>
typename RedeclarableTemplateDecl::SpecEntryTraits<EntryType>::DeclType *
RedeclarableTemplateDecl::findSpecializationImpl(
llvm::FoldingSetVector<EntryType> &Specs, void *&InsertPos,
ProfileArguments&&... ProfileArgs) {
using SETraits = SpecEntryTraits<EntryType>;
llvm::FoldingSetNodeID ID;
EntryType::Profile(ID, std::forward<ProfileArguments>(ProfileArgs)...,
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,
CorrectInsertPos,
SETraits::getTemplateArgs(Entry)) &&
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));
}
ArrayRef<TemplateArgument> RedeclarableTemplateDecl::getInjectedTemplateArgs() {
TemplateParameterList *Params = getTemplateParameters();
auto *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::ArrayRef(CommonPtr->InjectedArgs, Params->size());
}
//===----------------------------------------------------------------------===//
// FunctionTemplateDecl Implementation
//===----------------------------------------------------------------------===//
FunctionTemplateDecl *
FunctionTemplateDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation L,
DeclarationName Name,
TemplateParameterList *Params, NamedDecl *Decl) {
bool Invalid = AdoptTemplateParameterList(Params, cast<DeclContext>(Decl));
auto *TD = new (C, DC) FunctionTemplateDecl(C, DC, L, Name, Params, Decl);
if (Invalid)
TD->setInvalidDecl();
return TD;
}
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 {
auto *CommonPtr = new (C) Common;
C.addDestruction(CommonPtr);
return CommonPtr;
}
void FunctionTemplateDecl::LoadLazySpecializations() const {
loadLazySpecializationsImpl();
}
llvm::FoldingSetVector<FunctionTemplateSpecializationInfo> &
FunctionTemplateDecl::getSpecializations() const {
LoadLazySpecializations();
return getCommonPtr()->Specializations;
}
FunctionDecl *
FunctionTemplateDecl::findSpecialization(ArrayRef<TemplateArgument> Args,
void *&InsertPos) {
return findSpecializationImpl(getSpecializations(), InsertPos, Args);
}
void FunctionTemplateDecl::addSpecialization(
FunctionTemplateSpecializationInfo *Info, void *InsertPos) {
addSpecializationImpl<FunctionTemplateDecl>(getSpecializations(), Info,
InsertPos);
}
void FunctionTemplateDecl::mergePrevDecl(FunctionTemplateDecl *Prev) {
using Base = RedeclarableTemplateDecl;
// If we haven't created a common pointer yet, then it can just be created
// with the usual method.
if (!Base::Common)
return;
Common *ThisCommon = static_cast<Common *>(Base::Common);
Common *PrevCommon = nullptr;
SmallVector<FunctionTemplateDecl *, 8> PreviousDecls;
for (; Prev; Prev = Prev->getPreviousDecl()) {
if (Prev->Base::Common) {
PrevCommon = static_cast<Common *>(Prev->Base::Common);
break;
}
PreviousDecls.push_back(Prev);
}
// If the previous redecl chain hasn't created a common pointer yet, then just
// use this common pointer.
if (!PrevCommon) {
for (auto *D : PreviousDecls)
D->Base::Common = ThisCommon;
return;
}
// Ensure we don't leak any important state.
assert(ThisCommon->Specializations.size() == 0 &&
"Can't merge incompatible declarations!");
Base::Common = PrevCommon;
}
//===----------------------------------------------------------------------===//
// ClassTemplateDecl Implementation
//===----------------------------------------------------------------------===//
ClassTemplateDecl *ClassTemplateDecl::Create(ASTContext &C, DeclContext *DC,
SourceLocation L,
DeclarationName Name,
TemplateParameterList *Params,
NamedDecl *Decl) {
bool Invalid = AdoptTemplateParameterList(Params, cast<DeclContext>(Decl));
auto *TD = new (C, DC) ClassTemplateDecl(C, DC, L, Name, Params, Decl);
if (Invalid)
TD->setInvalidDecl();
return TD;
}
ClassTemplateDecl *ClassTemplateDecl::CreateDeserialized(ASTContext &C,
unsigned ID) {
return new (C, ID) ClassTemplateDecl(C, nullptr, SourceLocation(),
DeclarationName(), nullptr, nullptr);
}
void ClassTemplateDecl::LoadLazySpecializations() const {
loadLazySpecializationsImpl();
}
llvm::FoldingSetVector<ClassTemplateSpecializationDecl> &
ClassTemplateDecl::getSpecializations() const {
LoadLazySpecializations();
return getCommonPtr()->Specializations;
}
llvm::FoldingSetVector<ClassTemplatePartialSpecializationDecl> &
ClassTemplateDecl::getPartialSpecializations() const {
LoadLazySpecializations();
return getCommonPtr()->PartialSpecializations;
}
RedeclarableTemplateDecl::CommonBase *
ClassTemplateDecl::newCommon(ASTContext &C) const {
auto *CommonPtr = new (C) Common;
C.addDestruction(CommonPtr);
return CommonPtr;
}
ClassTemplateSpecializationDecl *
ClassTemplateDecl::findSpecialization(ArrayRef<TemplateArgument> Args,
void *&InsertPos) {
return findSpecializationImpl(getSpecializations(), InsertPos, Args);
}
void ClassTemplateDecl::AddSpecialization(ClassTemplateSpecializationDecl *D,
void *InsertPos) {
addSpecializationImpl<ClassTemplateDecl>(getSpecializations(), D, InsertPos);
}
ClassTemplatePartialSpecializationDecl *
ClassTemplateDecl::findPartialSpecialization(
ArrayRef<TemplateArgument> Args,
TemplateParameterList *TPL, void *&InsertPos) {
return findSpecializationImpl(getPartialSpecializations(), InsertPos, Args,
TPL);
}
void ClassTemplatePartialSpecializationDecl::Profile(
llvm::FoldingSetNodeID &ID, ArrayRef<TemplateArgument> TemplateArgs,
TemplateParameterList *TPL, const ASTContext &Context) {
ID.AddInteger(TemplateArgs.size());
for (const TemplateArgument &TemplateArg : TemplateArgs)
TemplateArg.Profile(ID, Context);
TPL->Profile(ID, Context);
}
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) const {
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, bool HasTypeConstraint,
std::optional<unsigned> NumExpanded) {
auto *TTPDecl =
new (C, DC,
additionalSizeToAlloc<TypeConstraint>(HasTypeConstraint ? 1 : 0))
TemplateTypeParmDecl(DC, KeyLoc, NameLoc, Id, Typename,
HasTypeConstraint, NumExpanded);
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, false, std::nullopt);
}
TemplateTypeParmDecl *
TemplateTypeParmDecl::CreateDeserialized(const ASTContext &C, unsigned ID,
bool HasTypeConstraint) {
return new (C, ID,
additionalSizeToAlloc<TypeConstraint>(HasTypeConstraint ? 1 : 0))
TemplateTypeParmDecl(nullptr, SourceLocation(), SourceLocation(), nullptr,
false, HasTypeConstraint, std::nullopt);
}
SourceLocation TemplateTypeParmDecl::getDefaultArgumentLoc() const {
return hasDefaultArgument()
? getDefaultArgumentInfo()->getTypeLoc().getBeginLoc()
: SourceLocation();
}
SourceRange TemplateTypeParmDecl::getSourceRange() const {
if (hasDefaultArgument() && !defaultArgumentWasInherited())
return SourceRange(getBeginLoc(),
getDefaultArgumentInfo()->getTypeLoc().getEndLoc());
// TypeDecl::getSourceRange returns a range containing name location, which is
// wrong for unnamed template parameters. e.g:
// it will return <[[typename>]] instead of <[[typename]]>
else if (getDeclName().isEmpty())
return SourceRange(getBeginLoc());
return TypeDecl::getSourceRange();
}
unsigned TemplateTypeParmDecl::getDepth() const {
return getTypeForDecl()->castAs<TemplateTypeParmType>()->getDepth();
}
unsigned TemplateTypeParmDecl::getIndex() const {
return getTypeForDecl()->castAs<TemplateTypeParmType>()->getIndex();
}
bool TemplateTypeParmDecl::isParameterPack() const {
return getTypeForDecl()->castAs<TemplateTypeParmType>()->isParameterPack();
}
void TemplateTypeParmDecl::setTypeConstraint(
ConceptReference *Loc, Expr *ImmediatelyDeclaredConstraint) {
assert(HasTypeConstraint &&
"HasTypeConstraint=true must be passed at construction in order to "
"call setTypeConstraint");
assert(!TypeConstraintInitialized &&
"TypeConstraint was already initialized!");
new (getTrailingObjects<TypeConstraint>())
TypeConstraint(Loc, ImmediatelyDeclaredConstraint);
TypeConstraintInitialized = true;
}
//===----------------------------------------------------------------------===//
// 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) {
AutoType *AT =
C.getLangOpts().CPlusPlus20 ? T->getContainedAutoType() : nullptr;
return new (C, DC,
additionalSizeToAlloc<std::pair<QualType, TypeSourceInfo *>,
Expr *>(0,
AT && AT->isConstrained() ? 1 : 0))
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) {
AutoType *AT = TInfo->getType()->getContainedAutoType();
return new (C, DC,
additionalSizeToAlloc<std::pair<QualType, TypeSourceInfo *>,
Expr *>(
ExpandedTypes.size(), AT && AT->isConstrained() ? 1 : 0))
NonTypeTemplateParmDecl(DC, StartLoc, IdLoc, D, P, Id, T, TInfo,
ExpandedTypes, ExpandedTInfos);
}
NonTypeTemplateParmDecl *
NonTypeTemplateParmDecl::CreateDeserialized(ASTContext &C, unsigned ID,
bool HasTypeConstraint) {
return new (C, ID, additionalSizeToAlloc<std::pair<QualType,
TypeSourceInfo *>,
Expr *>(0,
HasTypeConstraint ? 1 : 0))
NonTypeTemplateParmDecl(nullptr, SourceLocation(), SourceLocation(),
0, 0, nullptr, QualType(), false, nullptr);
}
NonTypeTemplateParmDecl *
NonTypeTemplateParmDecl::CreateDeserialized(ASTContext &C, unsigned ID,
unsigned NumExpandedTypes,
bool HasTypeConstraint) {
auto *NTTP =
new (C, ID,
additionalSizeToAlloc<std::pair<QualType, TypeSourceInfo *>, Expr *>(
NumExpandedTypes, HasTypeConstraint ? 1 : 0))
NonTypeTemplateParmDecl(nullptr, SourceLocation(), SourceLocation(),
0, 0, nullptr, QualType(), nullptr,
std::nullopt, std::nullopt);
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, std::nullopt);
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,
MemberSpecializationInfo *MSInfo) {
const ASTTemplateArgumentListInfo *ArgsAsWritten = nullptr;
if (TemplateArgsAsWritten)
ArgsAsWritten = ASTTemplateArgumentListInfo::Create(C,
*TemplateArgsAsWritten);
void *Mem =
C.Allocate(totalSizeToAlloc<MemberSpecializationInfo *>(MSInfo ? 1 : 0));
return new (Mem) FunctionTemplateSpecializationInfo(
FD, Template, TSK, TemplateArgs, ArgsAsWritten, POI, MSInfo);
}
//===----------------------------------------------------------------------===//
// 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) {
auto *Result =
new (Context, DC) ClassTemplateSpecializationDecl(
Context, ClassTemplateSpecialization, TK, DC, StartLoc, IdLoc,
SpecializedTemplate, Args, PrevDecl);
Result->setMayHaveOutOfDateDef(false);
// If the template decl is incomplete, copy the external lexical storage from
// the base template. This allows instantiations of incomplete types to
// complete using the external AST if the template's declaration came from an
// external AST.
if (!SpecializedTemplate->getTemplatedDecl()->isCompleteDefinition())
Result->setHasExternalLexicalStorage(
SpecializedTemplate->getTemplatedDecl()->hasExternalLexicalStorage());
Context.getTypeDeclType(Result, PrevDecl);
return Result;
}
ClassTemplateSpecializationDecl *
ClassTemplateSpecializationDecl::CreateDeserialized(ASTContext &C,
unsigned ID) {
auto *Result =
new (C, ID) ClassTemplateSpecializationDecl(C, ClassTemplateSpecialization);
Result->setMayHaveOutOfDateDef(false);
return Result;
}
void ClassTemplateSpecializationDecl::getNameForDiagnostic(
raw_ostream &OS, const PrintingPolicy &Policy, bool Qualified) const {
NamedDecl::getNameForDiagnostic(OS, Policy, Qualified);
const auto *PS = dyn_cast<ClassTemplatePartialSpecializationDecl>(this);
if (const ASTTemplateArgumentListInfo *ArgsAsWritten =
PS ? PS->getTemplateArgsAsWritten() : nullptr) {
printTemplateArgumentList(
OS, ArgsAsWritten->arguments(), Policy,
getSpecializedTemplate()->getTemplateParameters());
} else {
const TemplateArgumentList &TemplateArgs = getTemplateArgs();
printTemplateArgumentList(
OS, TemplateArgs.asArray(), Policy,
getSpecializedTemplate()->getTemplateParameters());
}
}
ClassTemplateDecl *
ClassTemplateSpecializationDecl::getSpecializedTemplate() const {
if (const auto *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())