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llvm-capstone/clang/lib/Sema/SemaTemplateInstantiate.cpp
David Majnemer 8c969eaf1a Sema: Disable template instantiation once a fatal error is raised 
Fatal errors disable all further diagnostics.  Continuing to permit
template instantiation does nothing but make it take longer for clang to
finish with the TU.

Instead, halt all further instantiation.

Fixed in PR22396.

llvm-svn: 227556
2015-01-30 05:01:23 +00:00

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//===------- SemaTemplateInstantiate.cpp - C++ Template Instantiation ------===/
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//===----------------------------------------------------------------------===/
//
// This file implements C++ template instantiation.
//
//===----------------------------------------------------------------------===/
#include "clang/Sema/SemaInternal.h"
#include "TreeTransform.h"
#include "clang/AST/ASTConsumer.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/ASTLambda.h"
#include "clang/AST/DeclTemplate.h"
#include "clang/AST/Expr.h"
#include "clang/Basic/LangOptions.h"
#include "clang/Sema/DeclSpec.h"
#include "clang/Sema/Initialization.h"
#include "clang/Sema/Lookup.h"
#include "clang/Sema/Template.h"
#include "clang/Sema/TemplateDeduction.h"
using namespace clang;
using namespace sema;
//===----------------------------------------------------------------------===/
// Template Instantiation Support
//===----------------------------------------------------------------------===/
/// \brief Retrieve the template argument list(s) that should be used to
/// instantiate the definition of the given declaration.
///
/// \param D the declaration for which we are computing template instantiation
/// arguments.
///
/// \param Innermost if non-NULL, the innermost template argument list.
///
/// \param RelativeToPrimary true if we should get the template
/// arguments relative to the primary template, even when we're
/// dealing with a specialization. This is only relevant for function
/// template specializations.
///
/// \param Pattern If non-NULL, indicates the pattern from which we will be
/// instantiating the definition of the given declaration, \p D. This is
/// used to determine the proper set of template instantiation arguments for
/// friend function template specializations.
MultiLevelTemplateArgumentList
Sema::getTemplateInstantiationArgs(NamedDecl *D,
const TemplateArgumentList *Innermost,
bool RelativeToPrimary,
const FunctionDecl *Pattern) {
// Accumulate the set of template argument lists in this structure.
MultiLevelTemplateArgumentList Result;
if (Innermost)
Result.addOuterTemplateArguments(Innermost);
DeclContext *Ctx = dyn_cast<DeclContext>(D);
if (!Ctx) {
Ctx = D->getDeclContext();
// Add template arguments from a variable template instantiation.
if (VarTemplateSpecializationDecl *Spec =
dyn_cast<VarTemplateSpecializationDecl>(D)) {
// We're done when we hit an explicit specialization.
if (Spec->getSpecializationKind() == TSK_ExplicitSpecialization &&
!isa<VarTemplatePartialSpecializationDecl>(Spec))
return Result;
Result.addOuterTemplateArguments(&Spec->getTemplateInstantiationArgs());
// If this variable template specialization was instantiated from a
// specialized member that is a variable template, we're done.
assert(Spec->getSpecializedTemplate() && "No variable template?");
llvm::PointerUnion<VarTemplateDecl*,
VarTemplatePartialSpecializationDecl*> Specialized
= Spec->getSpecializedTemplateOrPartial();
if (VarTemplatePartialSpecializationDecl *Partial =
Specialized.dyn_cast<VarTemplatePartialSpecializationDecl *>()) {
if (Partial->isMemberSpecialization())
return Result;
} else {
VarTemplateDecl *Tmpl = Specialized.get<VarTemplateDecl *>();
if (Tmpl->isMemberSpecialization())
return Result;
}
}
// If we have a template template parameter with translation unit context,
// then we're performing substitution into a default template argument of
// this template template parameter before we've constructed the template
// that will own this template template parameter. In this case, we
// use empty template parameter lists for all of the outer templates
// to avoid performing any substitutions.
if (Ctx->isTranslationUnit()) {
if (TemplateTemplateParmDecl *TTP
= dyn_cast<TemplateTemplateParmDecl>(D)) {
for (unsigned I = 0, N = TTP->getDepth() + 1; I != N; ++I)
Result.addOuterTemplateArguments(None);
return Result;
}
}
}
while (!Ctx->isFileContext()) {
// Add template arguments from a class template instantiation.
if (ClassTemplateSpecializationDecl *Spec
= dyn_cast<ClassTemplateSpecializationDecl>(Ctx)) {
// We're done when we hit an explicit specialization.
if (Spec->getSpecializationKind() == TSK_ExplicitSpecialization &&
!isa<ClassTemplatePartialSpecializationDecl>(Spec))
break;
Result.addOuterTemplateArguments(&Spec->getTemplateInstantiationArgs());
// If this class template specialization was instantiated from a
// specialized member that is a class template, we're done.
assert(Spec->getSpecializedTemplate() && "No class template?");
if (Spec->getSpecializedTemplate()->isMemberSpecialization())
break;
}
// Add template arguments from a function template specialization.
else if (FunctionDecl *Function = dyn_cast<FunctionDecl>(Ctx)) {
if (!RelativeToPrimary &&
(Function->getTemplateSpecializationKind() ==
TSK_ExplicitSpecialization &&
!Function->getClassScopeSpecializationPattern()))
break;
if (const TemplateArgumentList *TemplateArgs
= Function->getTemplateSpecializationArgs()) {
// Add the template arguments for this specialization.
Result.addOuterTemplateArguments(TemplateArgs);
// If this function was instantiated from a specialized member that is
// a function template, we're done.
assert(Function->getPrimaryTemplate() && "No function template?");
if (Function->getPrimaryTemplate()->isMemberSpecialization())
break;
// If this function is a generic lambda specialization, we are done.
if (isGenericLambdaCallOperatorSpecialization(Function))
break;
} else if (FunctionTemplateDecl *FunTmpl
= Function->getDescribedFunctionTemplate()) {
// Add the "injected" template arguments.
Result.addOuterTemplateArguments(FunTmpl->getInjectedTemplateArgs());
}
// If this is a friend declaration and it declares an entity at
// namespace scope, take arguments from its lexical parent
// instead of its semantic parent, unless of course the pattern we're
// instantiating actually comes from the file's context!
if (Function->getFriendObjectKind() &&
Function->getDeclContext()->isFileContext() &&
(!Pattern || !Pattern->getLexicalDeclContext()->isFileContext())) {
Ctx = Function->getLexicalDeclContext();
RelativeToPrimary = false;
continue;
}
} else if (CXXRecordDecl *Rec = dyn_cast<CXXRecordDecl>(Ctx)) {
if (ClassTemplateDecl *ClassTemplate = Rec->getDescribedClassTemplate()) {
QualType T = ClassTemplate->getInjectedClassNameSpecialization();
const TemplateSpecializationType *TST =
cast<TemplateSpecializationType>(Context.getCanonicalType(T));
Result.addOuterTemplateArguments(
llvm::makeArrayRef(TST->getArgs(), TST->getNumArgs()));
if (ClassTemplate->isMemberSpecialization())
break;
}
}
Ctx = Ctx->getParent();
RelativeToPrimary = false;
}
return Result;
}
bool Sema::ActiveTemplateInstantiation::isInstantiationRecord() const {
switch (Kind) {
case TemplateInstantiation:
case ExceptionSpecInstantiation:
case DefaultTemplateArgumentInstantiation:
case DefaultFunctionArgumentInstantiation:
case ExplicitTemplateArgumentSubstitution:
case DeducedTemplateArgumentSubstitution:
case PriorTemplateArgumentSubstitution:
return true;
case DefaultTemplateArgumentChecking:
return false;
}
llvm_unreachable("Invalid InstantiationKind!");
}
void Sema::InstantiatingTemplate::Initialize(
ActiveTemplateInstantiation::InstantiationKind Kind,
SourceLocation PointOfInstantiation, SourceRange InstantiationRange,
Decl *Entity, NamedDecl *Template, ArrayRef<TemplateArgument> TemplateArgs,
sema::TemplateDeductionInfo *DeductionInfo) {
SavedInNonInstantiationSFINAEContext =
SemaRef.InNonInstantiationSFINAEContext;
// Don't allow further instantiation if a fatal error has occcured. Any
// diagnostics we might have raised will not be visible.
if (SemaRef.Diags.hasFatalErrorOccurred()) {
Invalid = true;
return;
}
Invalid = CheckInstantiationDepth(PointOfInstantiation, InstantiationRange);
if (!Invalid) {
ActiveTemplateInstantiation Inst;
Inst.Kind = Kind;
Inst.PointOfInstantiation = PointOfInstantiation;
Inst.Entity = Entity;
Inst.Template = Template;
Inst.TemplateArgs = TemplateArgs.data();
Inst.NumTemplateArgs = TemplateArgs.size();
Inst.DeductionInfo = DeductionInfo;
Inst.InstantiationRange = InstantiationRange;
SemaRef.InNonInstantiationSFINAEContext = false;
SemaRef.ActiveTemplateInstantiations.push_back(Inst);
if (!Inst.isInstantiationRecord())
++SemaRef.NonInstantiationEntries;
}
}
Sema::InstantiatingTemplate::
InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
Decl *Entity,
SourceRange InstantiationRange)
: SemaRef(SemaRef)
{
Initialize(ActiveTemplateInstantiation::TemplateInstantiation,
PointOfInstantiation, InstantiationRange, Entity);
}
Sema::InstantiatingTemplate::
InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
FunctionDecl *Entity, ExceptionSpecification,
SourceRange InstantiationRange)
: SemaRef(SemaRef)
{
Initialize(ActiveTemplateInstantiation::ExceptionSpecInstantiation,
PointOfInstantiation, InstantiationRange, Entity);
}
Sema::InstantiatingTemplate::
InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
TemplateDecl *Template,
ArrayRef<TemplateArgument> TemplateArgs,
SourceRange InstantiationRange)
: SemaRef(SemaRef)
{
Initialize(ActiveTemplateInstantiation::DefaultTemplateArgumentInstantiation,
PointOfInstantiation, InstantiationRange,
Template, nullptr, TemplateArgs);
}
Sema::InstantiatingTemplate::
InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
FunctionTemplateDecl *FunctionTemplate,
ArrayRef<TemplateArgument> TemplateArgs,
ActiveTemplateInstantiation::InstantiationKind Kind,
sema::TemplateDeductionInfo &DeductionInfo,
SourceRange InstantiationRange)
: SemaRef(SemaRef)
{
Initialize(Kind, PointOfInstantiation, InstantiationRange,
FunctionTemplate, nullptr, TemplateArgs, &DeductionInfo);
}
Sema::InstantiatingTemplate::
InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
ClassTemplatePartialSpecializationDecl *PartialSpec,
ArrayRef<TemplateArgument> TemplateArgs,
sema::TemplateDeductionInfo &DeductionInfo,
SourceRange InstantiationRange)
: SemaRef(SemaRef)
{
Initialize(ActiveTemplateInstantiation::DeducedTemplateArgumentSubstitution,
PointOfInstantiation, InstantiationRange,
PartialSpec, nullptr, TemplateArgs, &DeductionInfo);
}
Sema::InstantiatingTemplate::InstantiatingTemplate(
Sema &SemaRef, SourceLocation PointOfInstantiation,
VarTemplatePartialSpecializationDecl *PartialSpec,
ArrayRef<TemplateArgument> TemplateArgs,
sema::TemplateDeductionInfo &DeductionInfo, SourceRange InstantiationRange)
: SemaRef(SemaRef)
{
Initialize(ActiveTemplateInstantiation::DeducedTemplateArgumentSubstitution,
PointOfInstantiation, InstantiationRange,
PartialSpec, nullptr, TemplateArgs, &DeductionInfo);
}
Sema::InstantiatingTemplate::
InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
ParmVarDecl *Param,
ArrayRef<TemplateArgument> TemplateArgs,
SourceRange InstantiationRange)
: SemaRef(SemaRef)
{
Initialize(ActiveTemplateInstantiation::DefaultFunctionArgumentInstantiation,
PointOfInstantiation, InstantiationRange,
Param, nullptr, TemplateArgs);
}
Sema::InstantiatingTemplate::
InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
NamedDecl *Template, NonTypeTemplateParmDecl *Param,
ArrayRef<TemplateArgument> TemplateArgs,
SourceRange InstantiationRange)
: SemaRef(SemaRef)
{
Initialize(ActiveTemplateInstantiation::PriorTemplateArgumentSubstitution,
PointOfInstantiation, InstantiationRange,
Param, Template, TemplateArgs);
}
Sema::InstantiatingTemplate::
InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
NamedDecl *Template, TemplateTemplateParmDecl *Param,
ArrayRef<TemplateArgument> TemplateArgs,
SourceRange InstantiationRange)
: SemaRef(SemaRef)
{
Initialize(ActiveTemplateInstantiation::PriorTemplateArgumentSubstitution,
PointOfInstantiation, InstantiationRange,
Param, Template, TemplateArgs);
}
Sema::InstantiatingTemplate::
InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
TemplateDecl *Template, NamedDecl *Param,
ArrayRef<TemplateArgument> TemplateArgs,
SourceRange InstantiationRange)
: SemaRef(SemaRef)
{
Initialize(ActiveTemplateInstantiation::DefaultTemplateArgumentChecking,
PointOfInstantiation, InstantiationRange,
Param, Template, TemplateArgs);
}
void Sema::InstantiatingTemplate::Clear() {
if (!Invalid) {
if (!SemaRef.ActiveTemplateInstantiations.back().isInstantiationRecord()) {
assert(SemaRef.NonInstantiationEntries > 0);
--SemaRef.NonInstantiationEntries;
}
SemaRef.InNonInstantiationSFINAEContext
= SavedInNonInstantiationSFINAEContext;
// Name lookup no longer looks in this template's defining module.
assert(SemaRef.ActiveTemplateInstantiations.size() >=
SemaRef.ActiveTemplateInstantiationLookupModules.size() &&
"forgot to remove a lookup module for a template instantiation");
if (SemaRef.ActiveTemplateInstantiations.size() ==
SemaRef.ActiveTemplateInstantiationLookupModules.size()) {
if (Module *M = SemaRef.ActiveTemplateInstantiationLookupModules.back())
SemaRef.LookupModulesCache.erase(M);
SemaRef.ActiveTemplateInstantiationLookupModules.pop_back();
}
SemaRef.ActiveTemplateInstantiations.pop_back();
Invalid = true;
}
}
bool Sema::InstantiatingTemplate::CheckInstantiationDepth(
SourceLocation PointOfInstantiation,
SourceRange InstantiationRange) {
assert(SemaRef.NonInstantiationEntries <=
SemaRef.ActiveTemplateInstantiations.size());
if ((SemaRef.ActiveTemplateInstantiations.size() -
SemaRef.NonInstantiationEntries)
<= SemaRef.getLangOpts().InstantiationDepth)
return false;
SemaRef.Diag(PointOfInstantiation,
diag::err_template_recursion_depth_exceeded)
<< SemaRef.getLangOpts().InstantiationDepth
<< InstantiationRange;
SemaRef.Diag(PointOfInstantiation, diag::note_template_recursion_depth)
<< SemaRef.getLangOpts().InstantiationDepth;
return true;
}
/// \brief Prints the current instantiation stack through a series of
/// notes.
void Sema::PrintInstantiationStack() {
// Determine which template instantiations to skip, if any.
unsigned SkipStart = ActiveTemplateInstantiations.size(), SkipEnd = SkipStart;
unsigned Limit = Diags.getTemplateBacktraceLimit();
if (Limit && Limit < ActiveTemplateInstantiations.size()) {
SkipStart = Limit / 2 + Limit % 2;
SkipEnd = ActiveTemplateInstantiations.size() - Limit / 2;
}
// FIXME: In all of these cases, we need to show the template arguments
unsigned InstantiationIdx = 0;
for (SmallVectorImpl<ActiveTemplateInstantiation>::reverse_iterator
Active = ActiveTemplateInstantiations.rbegin(),
ActiveEnd = ActiveTemplateInstantiations.rend();
Active != ActiveEnd;
++Active, ++InstantiationIdx) {
// Skip this instantiation?
if (InstantiationIdx >= SkipStart && InstantiationIdx < SkipEnd) {
if (InstantiationIdx == SkipStart) {
// Note that we're skipping instantiations.
Diags.Report(Active->PointOfInstantiation,
diag::note_instantiation_contexts_suppressed)
<< unsigned(ActiveTemplateInstantiations.size() - Limit);
}
continue;
}
switch (Active->Kind) {
case ActiveTemplateInstantiation::TemplateInstantiation: {
Decl *D = Active->Entity;
if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(D)) {
unsigned DiagID = diag::note_template_member_class_here;
if (isa<ClassTemplateSpecializationDecl>(Record))
DiagID = diag::note_template_class_instantiation_here;
Diags.Report(Active->PointOfInstantiation, DiagID)
<< Context.getTypeDeclType(Record)
<< Active->InstantiationRange;
} else if (FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) {
unsigned DiagID;
if (Function->getPrimaryTemplate())
DiagID = diag::note_function_template_spec_here;
else
DiagID = diag::note_template_member_function_here;
Diags.Report(Active->PointOfInstantiation, DiagID)
<< Function
<< Active->InstantiationRange;
} else if (VarDecl *VD = dyn_cast<VarDecl>(D)) {
Diags.Report(Active->PointOfInstantiation,
VD->isStaticDataMember()?
diag::note_template_static_data_member_def_here
: diag::note_template_variable_def_here)
<< VD
<< Active->InstantiationRange;
} else if (EnumDecl *ED = dyn_cast<EnumDecl>(D)) {
Diags.Report(Active->PointOfInstantiation,
diag::note_template_enum_def_here)
<< ED
<< Active->InstantiationRange;
} else if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) {
Diags.Report(Active->PointOfInstantiation,
diag::note_template_nsdmi_here)
<< FD << Active->InstantiationRange;
} else {
Diags.Report(Active->PointOfInstantiation,
diag::note_template_type_alias_instantiation_here)
<< cast<TypeAliasTemplateDecl>(D)
<< Active->InstantiationRange;
}
break;
}
case ActiveTemplateInstantiation::DefaultTemplateArgumentInstantiation: {
TemplateDecl *Template = cast<TemplateDecl>(Active->Entity);
SmallVector<char, 128> TemplateArgsStr;
llvm::raw_svector_ostream OS(TemplateArgsStr);
Template->printName(OS);
TemplateSpecializationType::PrintTemplateArgumentList(OS,
Active->TemplateArgs,
Active->NumTemplateArgs,
getPrintingPolicy());
Diags.Report(Active->PointOfInstantiation,
diag::note_default_arg_instantiation_here)
<< OS.str()
<< Active->InstantiationRange;
break;
}
case ActiveTemplateInstantiation::ExplicitTemplateArgumentSubstitution: {
FunctionTemplateDecl *FnTmpl = cast<FunctionTemplateDecl>(Active->Entity);
Diags.Report(Active->PointOfInstantiation,
diag::note_explicit_template_arg_substitution_here)
<< FnTmpl
<< getTemplateArgumentBindingsText(FnTmpl->getTemplateParameters(),
Active->TemplateArgs,
Active->NumTemplateArgs)
<< Active->InstantiationRange;
break;
}
case ActiveTemplateInstantiation::DeducedTemplateArgumentSubstitution:
if (ClassTemplatePartialSpecializationDecl *PartialSpec =
dyn_cast<ClassTemplatePartialSpecializationDecl>(Active->Entity)) {
Diags.Report(Active->PointOfInstantiation,
diag::note_partial_spec_deduct_instantiation_here)
<< Context.getTypeDeclType(PartialSpec)
<< getTemplateArgumentBindingsText(
PartialSpec->getTemplateParameters(),
Active->TemplateArgs,
Active->NumTemplateArgs)
<< Active->InstantiationRange;
} else {
FunctionTemplateDecl *FnTmpl
= cast<FunctionTemplateDecl>(Active->Entity);
Diags.Report(Active->PointOfInstantiation,
diag::note_function_template_deduction_instantiation_here)
<< FnTmpl
<< getTemplateArgumentBindingsText(FnTmpl->getTemplateParameters(),
Active->TemplateArgs,
Active->NumTemplateArgs)
<< Active->InstantiationRange;
}
break;
case ActiveTemplateInstantiation::DefaultFunctionArgumentInstantiation: {
ParmVarDecl *Param = cast<ParmVarDecl>(Active->Entity);
FunctionDecl *FD = cast<FunctionDecl>(Param->getDeclContext());
SmallVector<char, 128> TemplateArgsStr;
llvm::raw_svector_ostream OS(TemplateArgsStr);
FD->printName(OS);
TemplateSpecializationType::PrintTemplateArgumentList(OS,
Active->TemplateArgs,
Active->NumTemplateArgs,
getPrintingPolicy());
Diags.Report(Active->PointOfInstantiation,
diag::note_default_function_arg_instantiation_here)
<< OS.str()
<< Active->InstantiationRange;
break;
}
case ActiveTemplateInstantiation::PriorTemplateArgumentSubstitution: {
NamedDecl *Parm = cast<NamedDecl>(Active->Entity);
std::string Name;
if (!Parm->getName().empty())
Name = std::string(" '") + Parm->getName().str() + "'";
TemplateParameterList *TemplateParams = nullptr;
if (TemplateDecl *Template = dyn_cast<TemplateDecl>(Active->Template))
TemplateParams = Template->getTemplateParameters();
else
TemplateParams =
cast<ClassTemplatePartialSpecializationDecl>(Active->Template)
->getTemplateParameters();
Diags.Report(Active->PointOfInstantiation,
diag::note_prior_template_arg_substitution)
<< isa<TemplateTemplateParmDecl>(Parm)
<< Name
<< getTemplateArgumentBindingsText(TemplateParams,
Active->TemplateArgs,
Active->NumTemplateArgs)
<< Active->InstantiationRange;
break;
}
case ActiveTemplateInstantiation::DefaultTemplateArgumentChecking: {
TemplateParameterList *TemplateParams = nullptr;
if (TemplateDecl *Template = dyn_cast<TemplateDecl>(Active->Template))
TemplateParams = Template->getTemplateParameters();
else
TemplateParams =
cast<ClassTemplatePartialSpecializationDecl>(Active->Template)
->getTemplateParameters();
Diags.Report(Active->PointOfInstantiation,
diag::note_template_default_arg_checking)
<< getTemplateArgumentBindingsText(TemplateParams,
Active->TemplateArgs,
Active->NumTemplateArgs)
<< Active->InstantiationRange;
break;
}
case ActiveTemplateInstantiation::ExceptionSpecInstantiation:
Diags.Report(Active->PointOfInstantiation,
diag::note_template_exception_spec_instantiation_here)
<< cast<FunctionDecl>(Active->Entity)
<< Active->InstantiationRange;
break;
}
}
}
Optional<TemplateDeductionInfo *> Sema::isSFINAEContext() const {
if (InNonInstantiationSFINAEContext)
return Optional<TemplateDeductionInfo *>(nullptr);
for (SmallVectorImpl<ActiveTemplateInstantiation>::const_reverse_iterator
Active = ActiveTemplateInstantiations.rbegin(),
ActiveEnd = ActiveTemplateInstantiations.rend();
Active != ActiveEnd;
++Active)
{
switch(Active->Kind) {
case ActiveTemplateInstantiation::TemplateInstantiation:
// An instantiation of an alias template may or may not be a SFINAE
// context, depending on what else is on the stack.
if (isa<TypeAliasTemplateDecl>(Active->Entity))
break;
// Fall through.
case ActiveTemplateInstantiation::DefaultFunctionArgumentInstantiation:
case ActiveTemplateInstantiation::ExceptionSpecInstantiation:
// This is a template instantiation, so there is no SFINAE.
return None;
case ActiveTemplateInstantiation::DefaultTemplateArgumentInstantiation:
case ActiveTemplateInstantiation::PriorTemplateArgumentSubstitution:
case ActiveTemplateInstantiation::DefaultTemplateArgumentChecking:
// A default template argument instantiation and substitution into
// template parameters with arguments for prior parameters may or may
// not be a SFINAE context; look further up the stack.
break;
case ActiveTemplateInstantiation::ExplicitTemplateArgumentSubstitution:
case ActiveTemplateInstantiation::DeducedTemplateArgumentSubstitution:
// We're either substitution explicitly-specified template arguments
// or deduced template arguments, so SFINAE applies.
assert(Active->DeductionInfo && "Missing deduction info pointer");
return Active->DeductionInfo;
}
}
return None;
}
/// \brief Retrieve the depth and index of a parameter pack.
static std::pair<unsigned, unsigned>
getDepthAndIndex(NamedDecl *ND) {
if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(ND))
return std::make_pair(TTP->getDepth(), TTP->getIndex());
if (NonTypeTemplateParmDecl *NTTP = dyn_cast<NonTypeTemplateParmDecl>(ND))
return std::make_pair(NTTP->getDepth(), NTTP->getIndex());
TemplateTemplateParmDecl *TTP = cast<TemplateTemplateParmDecl>(ND);
return std::make_pair(TTP->getDepth(), TTP->getIndex());
}
//===----------------------------------------------------------------------===/
// Template Instantiation for Types
//===----------------------------------------------------------------------===/
namespace {
class TemplateInstantiator : public TreeTransform<TemplateInstantiator> {
const MultiLevelTemplateArgumentList &TemplateArgs;
SourceLocation Loc;
DeclarationName Entity;
public:
typedef TreeTransform<TemplateInstantiator> inherited;
TemplateInstantiator(Sema &SemaRef,
const MultiLevelTemplateArgumentList &TemplateArgs,
SourceLocation Loc,
DeclarationName Entity)
: inherited(SemaRef), TemplateArgs(TemplateArgs), Loc(Loc),
Entity(Entity) { }
/// \brief Determine whether the given type \p T has already been
/// transformed.
///
/// For the purposes of template instantiation, a type has already been
/// transformed if it is NULL or if it is not dependent.
bool AlreadyTransformed(QualType T);
/// \brief Returns the location of the entity being instantiated, if known.
SourceLocation getBaseLocation() { return Loc; }
/// \brief Returns the name of the entity being instantiated, if any.
DeclarationName getBaseEntity() { return Entity; }
/// \brief Sets the "base" location and entity when that
/// information is known based on another transformation.
void setBase(SourceLocation Loc, DeclarationName Entity) {
this->Loc = Loc;
this->Entity = Entity;
}
bool TryExpandParameterPacks(SourceLocation EllipsisLoc,
SourceRange PatternRange,
ArrayRef<UnexpandedParameterPack> Unexpanded,
bool &ShouldExpand, bool &RetainExpansion,
Optional<unsigned> &NumExpansions) {
return getSema().CheckParameterPacksForExpansion(EllipsisLoc,
PatternRange, Unexpanded,
TemplateArgs,
ShouldExpand,
RetainExpansion,
NumExpansions);
}
void ExpandingFunctionParameterPack(ParmVarDecl *Pack) {
SemaRef.CurrentInstantiationScope->MakeInstantiatedLocalArgPack(Pack);
}
TemplateArgument ForgetPartiallySubstitutedPack() {
TemplateArgument Result;
if (NamedDecl *PartialPack
= SemaRef.CurrentInstantiationScope->getPartiallySubstitutedPack()){
MultiLevelTemplateArgumentList &TemplateArgs
= const_cast<MultiLevelTemplateArgumentList &>(this->TemplateArgs);
unsigned Depth, Index;
std::tie(Depth, Index) = getDepthAndIndex(PartialPack);
if (TemplateArgs.hasTemplateArgument(Depth, Index)) {
Result = TemplateArgs(Depth, Index);
TemplateArgs.setArgument(Depth, Index, TemplateArgument());
}
}
return Result;
}
void RememberPartiallySubstitutedPack(TemplateArgument Arg) {
if (Arg.isNull())
return;
if (NamedDecl *PartialPack
= SemaRef.CurrentInstantiationScope->getPartiallySubstitutedPack()){
MultiLevelTemplateArgumentList &TemplateArgs
= const_cast<MultiLevelTemplateArgumentList &>(this->TemplateArgs);
unsigned Depth, Index;
std::tie(Depth, Index) = getDepthAndIndex(PartialPack);
TemplateArgs.setArgument(Depth, Index, Arg);
}
}
/// \brief Transform the given declaration by instantiating a reference to
/// this declaration.
Decl *TransformDecl(SourceLocation Loc, Decl *D);
void transformAttrs(Decl *Old, Decl *New) {
SemaRef.InstantiateAttrs(TemplateArgs, Old, New);
}
void transformedLocalDecl(Decl *Old, Decl *New) {
SemaRef.CurrentInstantiationScope->InstantiatedLocal(Old, New);
}
/// \brief Transform the definition of the given declaration by
/// instantiating it.
Decl *TransformDefinition(SourceLocation Loc, Decl *D);
/// \brief Transform the first qualifier within a scope by instantiating the
/// declaration.
NamedDecl *TransformFirstQualifierInScope(NamedDecl *D, SourceLocation Loc);
/// \brief Rebuild the exception declaration and register the declaration
/// as an instantiated local.
VarDecl *RebuildExceptionDecl(VarDecl *ExceptionDecl,
TypeSourceInfo *Declarator,
SourceLocation StartLoc,
SourceLocation NameLoc,
IdentifierInfo *Name);
/// \brief Rebuild the Objective-C exception declaration and register the
/// declaration as an instantiated local.
VarDecl *RebuildObjCExceptionDecl(VarDecl *ExceptionDecl,
TypeSourceInfo *TSInfo, QualType T);
/// \brief Check for tag mismatches when instantiating an
/// elaborated type.
QualType RebuildElaboratedType(SourceLocation KeywordLoc,
ElaboratedTypeKeyword Keyword,
NestedNameSpecifierLoc QualifierLoc,
QualType T);
TemplateName
TransformTemplateName(CXXScopeSpec &SS, TemplateName Name,
SourceLocation NameLoc,
QualType ObjectType = QualType(),
NamedDecl *FirstQualifierInScope = nullptr);
const LoopHintAttr *TransformLoopHintAttr(const LoopHintAttr *LH);
ExprResult TransformPredefinedExpr(PredefinedExpr *E);
ExprResult TransformDeclRefExpr(DeclRefExpr *E);
ExprResult TransformCXXDefaultArgExpr(CXXDefaultArgExpr *E);
ExprResult TransformTemplateParmRefExpr(DeclRefExpr *E,
NonTypeTemplateParmDecl *D);
ExprResult TransformSubstNonTypeTemplateParmPackExpr(
SubstNonTypeTemplateParmPackExpr *E);
/// \brief Rebuild a DeclRefExpr for a ParmVarDecl reference.
ExprResult RebuildParmVarDeclRefExpr(ParmVarDecl *PD, SourceLocation Loc);
/// \brief Transform a reference to a function parameter pack.
ExprResult TransformFunctionParmPackRefExpr(DeclRefExpr *E,
ParmVarDecl *PD);
/// \brief Transform a FunctionParmPackExpr which was built when we couldn't
/// expand a function parameter pack reference which refers to an expanded
/// pack.
ExprResult TransformFunctionParmPackExpr(FunctionParmPackExpr *E);
QualType TransformFunctionProtoType(TypeLocBuilder &TLB,
FunctionProtoTypeLoc TL) {
// Call the base version; it will forward to our overridden version below.
return inherited::TransformFunctionProtoType(TLB, TL);
}
template<typename Fn>
QualType TransformFunctionProtoType(TypeLocBuilder &TLB,
FunctionProtoTypeLoc TL,
CXXRecordDecl *ThisContext,
unsigned ThisTypeQuals,
Fn TransformExceptionSpec);
ParmVarDecl *TransformFunctionTypeParam(ParmVarDecl *OldParm,
int indexAdjustment,
Optional<unsigned> NumExpansions,
bool ExpectParameterPack);
/// \brief Transforms a template type parameter type by performing
/// substitution of the corresponding template type argument.
QualType TransformTemplateTypeParmType(TypeLocBuilder &TLB,
TemplateTypeParmTypeLoc TL);
/// \brief Transforms an already-substituted template type parameter pack
/// into either itself (if we aren't substituting into its pack expansion)
/// or the appropriate substituted argument.
QualType TransformSubstTemplateTypeParmPackType(TypeLocBuilder &TLB,
SubstTemplateTypeParmPackTypeLoc TL);
ExprResult TransformCallExpr(CallExpr *CE) {
getSema().CallsUndergoingInstantiation.push_back(CE);
ExprResult Result =
TreeTransform<TemplateInstantiator>::TransformCallExpr(CE);
getSema().CallsUndergoingInstantiation.pop_back();
return Result;
}
ExprResult TransformLambdaExpr(LambdaExpr *E) {
LocalInstantiationScope Scope(SemaRef, /*CombineWithOuterScope=*/true);
return TreeTransform<TemplateInstantiator>::TransformLambdaExpr(E);
}
ExprResult TransformLambdaScope(LambdaExpr *E,
CXXMethodDecl *NewCallOperator,
ArrayRef<InitCaptureInfoTy> InitCaptureExprsAndTypes) {
CXXMethodDecl *const OldCallOperator = E->getCallOperator();
// In the generic lambda case, we set the NewTemplate to be considered
// an "instantiation" of the OldTemplate.
if (FunctionTemplateDecl *const NewCallOperatorTemplate =
NewCallOperator->getDescribedFunctionTemplate()) {
FunctionTemplateDecl *const OldCallOperatorTemplate =
OldCallOperator->getDescribedFunctionTemplate();
NewCallOperatorTemplate->setInstantiatedFromMemberTemplate(
OldCallOperatorTemplate);
} else
// For a non-generic lambda we set the NewCallOperator to
// be an instantiation of the OldCallOperator.
NewCallOperator->setInstantiationOfMemberFunction(OldCallOperator,
TSK_ImplicitInstantiation);
return inherited::TransformLambdaScope(E, NewCallOperator,
InitCaptureExprsAndTypes);
}
TemplateParameterList *TransformTemplateParameterList(
TemplateParameterList *OrigTPL) {
if (!OrigTPL || !OrigTPL->size()) return OrigTPL;
DeclContext *Owner = OrigTPL->getParam(0)->getDeclContext();
TemplateDeclInstantiator DeclInstantiator(getSema(),
/* DeclContext *Owner */ Owner, TemplateArgs);
return DeclInstantiator.SubstTemplateParams(OrigTPL);
}
private:
ExprResult transformNonTypeTemplateParmRef(NonTypeTemplateParmDecl *parm,
SourceLocation loc,
TemplateArgument arg);
};
}
bool TemplateInstantiator::AlreadyTransformed(QualType T) {
if (T.isNull())
return true;
if (T->isInstantiationDependentType() || T->isVariablyModifiedType())
return false;
getSema().MarkDeclarationsReferencedInType(Loc, T);
return true;
}
static TemplateArgument
getPackSubstitutedTemplateArgument(Sema &S, TemplateArgument Arg) {
assert(S.ArgumentPackSubstitutionIndex >= 0);
assert(S.ArgumentPackSubstitutionIndex < (int)Arg.pack_size());
Arg = Arg.pack_begin()[S.ArgumentPackSubstitutionIndex];
if (Arg.isPackExpansion())
Arg = Arg.getPackExpansionPattern();
return Arg;
}
Decl *TemplateInstantiator::TransformDecl(SourceLocation Loc, Decl *D) {
if (!D)
return nullptr;
if (TemplateTemplateParmDecl *TTP = dyn_cast<TemplateTemplateParmDecl>(D)) {
if (TTP->getDepth() < TemplateArgs.getNumLevels()) {
// If the corresponding template argument is NULL or non-existent, it's
// because we are performing instantiation from explicitly-specified
// template arguments in a function template, but there were some
// arguments left unspecified.
if (!TemplateArgs.hasTemplateArgument(TTP->getDepth(),
TTP->getPosition()))
return D;
TemplateArgument Arg = TemplateArgs(TTP->getDepth(), TTP->getPosition());
if (TTP->isParameterPack()) {
assert(Arg.getKind() == TemplateArgument::Pack &&
"Missing argument pack");
Arg = getPackSubstitutedTemplateArgument(getSema(), Arg);
}
TemplateName Template = Arg.getAsTemplate();
assert(!Template.isNull() && Template.getAsTemplateDecl() &&
"Wrong kind of template template argument");
return Template.getAsTemplateDecl();
}
// Fall through to find the instantiated declaration for this template
// template parameter.
}
return SemaRef.FindInstantiatedDecl(Loc, cast<NamedDecl>(D), TemplateArgs);
}
Decl *TemplateInstantiator::TransformDefinition(SourceLocation Loc, Decl *D) {
Decl *Inst = getSema().SubstDecl(D, getSema().CurContext, TemplateArgs);
if (!Inst)
return nullptr;
getSema().CurrentInstantiationScope->InstantiatedLocal(D, Inst);
return Inst;
}
NamedDecl *
TemplateInstantiator::TransformFirstQualifierInScope(NamedDecl *D,
SourceLocation Loc) {
// If the first part of the nested-name-specifier was a template type
// parameter, instantiate that type parameter down to a tag type.
if (TemplateTypeParmDecl *TTPD = dyn_cast_or_null<TemplateTypeParmDecl>(D)) {
const TemplateTypeParmType *TTP
= cast<TemplateTypeParmType>(getSema().Context.getTypeDeclType(TTPD));
if (TTP->getDepth() < TemplateArgs.getNumLevels()) {
// FIXME: This needs testing w/ member access expressions.
TemplateArgument Arg = TemplateArgs(TTP->getDepth(), TTP->getIndex());
if (TTP->isParameterPack()) {
assert(Arg.getKind() == TemplateArgument::Pack &&
"Missing argument pack");
if (getSema().ArgumentPackSubstitutionIndex == -1)
return nullptr;
Arg = getPackSubstitutedTemplateArgument(getSema(), Arg);
}
QualType T = Arg.getAsType();
if (T.isNull())
return cast_or_null<NamedDecl>(TransformDecl(Loc, D));
if (const TagType *Tag = T->getAs<TagType>())
return Tag->getDecl();
// The resulting type is not a tag; complain.
getSema().Diag(Loc, diag::err_nested_name_spec_non_tag) << T;
return nullptr;
}
}
return cast_or_null<NamedDecl>(TransformDecl(Loc, D));
}
VarDecl *
TemplateInstantiator::RebuildExceptionDecl(VarDecl *ExceptionDecl,
TypeSourceInfo *Declarator,
SourceLocation StartLoc,
SourceLocation NameLoc,
IdentifierInfo *Name) {
VarDecl *Var = inherited::RebuildExceptionDecl(ExceptionDecl, Declarator,
StartLoc, NameLoc, Name);
if (Var)
getSema().CurrentInstantiationScope->InstantiatedLocal(ExceptionDecl, Var);
return Var;
}
VarDecl *TemplateInstantiator::RebuildObjCExceptionDecl(VarDecl *ExceptionDecl,
TypeSourceInfo *TSInfo,
QualType T) {
VarDecl *Var = inherited::RebuildObjCExceptionDecl(ExceptionDecl, TSInfo, T);
if (Var)
getSema().CurrentInstantiationScope->InstantiatedLocal(ExceptionDecl, Var);
return Var;
}
QualType
TemplateInstantiator::RebuildElaboratedType(SourceLocation KeywordLoc,
ElaboratedTypeKeyword Keyword,
NestedNameSpecifierLoc QualifierLoc,
QualType T) {
if (const TagType *TT = T->getAs<TagType>()) {
TagDecl* TD = TT->getDecl();
SourceLocation TagLocation = KeywordLoc;
IdentifierInfo *Id = TD->getIdentifier();
// TODO: should we even warn on struct/class mismatches for this? Seems
// like it's likely to produce a lot of spurious errors.
if (Id && Keyword != ETK_None && Keyword != ETK_Typename) {
TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForKeyword(Keyword);
if (!SemaRef.isAcceptableTagRedeclaration(TD, Kind, /*isDefinition*/false,
TagLocation, *Id)) {
SemaRef.Diag(TagLocation, diag::err_use_with_wrong_tag)
<< Id
<< FixItHint::CreateReplacement(SourceRange(TagLocation),
TD->getKindName());
SemaRef.Diag(TD->getLocation(), diag::note_previous_use);
}
}
}
return TreeTransform<TemplateInstantiator>::RebuildElaboratedType(KeywordLoc,
Keyword,
QualifierLoc,
T);
}
TemplateName TemplateInstantiator::TransformTemplateName(CXXScopeSpec &SS,
TemplateName Name,
SourceLocation NameLoc,
QualType ObjectType,
NamedDecl *FirstQualifierInScope) {
if (TemplateTemplateParmDecl *TTP
= dyn_cast_or_null<TemplateTemplateParmDecl>(Name.getAsTemplateDecl())) {
if (TTP->getDepth() < TemplateArgs.getNumLevels()) {
// If the corresponding template argument is NULL or non-existent, it's
// because we are performing instantiation from explicitly-specified
// template arguments in a function template, but there were some
// arguments left unspecified.
if (!TemplateArgs.hasTemplateArgument(TTP->getDepth(),
TTP->getPosition()))
return Name;
TemplateArgument Arg = TemplateArgs(TTP->getDepth(), TTP->getPosition());
if (TTP->isParameterPack()) {
assert(Arg.getKind() == TemplateArgument::Pack &&
"Missing argument pack");
if (getSema().ArgumentPackSubstitutionIndex == -1) {
// We have the template argument pack to substitute, but we're not
// actually expanding the enclosing pack expansion yet. So, just
// keep the entire argument pack.
return getSema().Context.getSubstTemplateTemplateParmPack(TTP, Arg);
}
Arg = getPackSubstitutedTemplateArgument(getSema(), Arg);
}
TemplateName Template = Arg.getAsTemplate();
assert(!Template.isNull() && "Null template template argument");
// We don't ever want to substitute for a qualified template name, since
// the qualifier is handled separately. So, look through the qualified
// template name to its underlying declaration.
if (QualifiedTemplateName *QTN = Template.getAsQualifiedTemplateName())
Template = TemplateName(QTN->getTemplateDecl());
Template = getSema().Context.getSubstTemplateTemplateParm(TTP, Template);
return Template;
}
}
if (SubstTemplateTemplateParmPackStorage *SubstPack
= Name.getAsSubstTemplateTemplateParmPack()) {
if (getSema().ArgumentPackSubstitutionIndex == -1)
return Name;
TemplateArgument Arg = SubstPack->getArgumentPack();
Arg = getPackSubstitutedTemplateArgument(getSema(), Arg);
return Arg.getAsTemplate();
}
return inherited::TransformTemplateName(SS, Name, NameLoc, ObjectType,
FirstQualifierInScope);
}
ExprResult
TemplateInstantiator::TransformPredefinedExpr(PredefinedExpr *E) {
if (!E->isTypeDependent())
return E;
return getSema().BuildPredefinedExpr(E->getLocation(), E->getIdentType());
}
ExprResult
TemplateInstantiator::TransformTemplateParmRefExpr(DeclRefExpr *E,
NonTypeTemplateParmDecl *NTTP) {
// If the corresponding template argument is NULL or non-existent, it's
// because we are performing instantiation from explicitly-specified
// template arguments in a function template, but there were some
// arguments left unspecified.
if (!TemplateArgs.hasTemplateArgument(NTTP->getDepth(),
NTTP->getPosition()))
return E;
TemplateArgument Arg = TemplateArgs(NTTP->getDepth(), NTTP->getPosition());
if (NTTP->isParameterPack()) {
assert(Arg.getKind() == TemplateArgument::Pack &&
"Missing argument pack");
if (getSema().ArgumentPackSubstitutionIndex == -1) {
// We have an argument pack, but we can't select a particular argument
// out of it yet. Therefore, we'll build an expression to hold on to that
// argument pack.
QualType TargetType = SemaRef.SubstType(NTTP->getType(), TemplateArgs,
E->getLocation(),
NTTP->getDeclName());
if (TargetType.isNull())
return ExprError();
return new (SemaRef.Context) SubstNonTypeTemplateParmPackExpr(TargetType,
NTTP,
E->getLocation(),
Arg);
}
Arg = getPackSubstitutedTemplateArgument(getSema(), Arg);
}
return transformNonTypeTemplateParmRef(NTTP, E->getLocation(), Arg);
}
const LoopHintAttr *
TemplateInstantiator::TransformLoopHintAttr(const LoopHintAttr *LH) {
Expr *TransformedExpr = getDerived().TransformExpr(LH->getValue()).get();
if (TransformedExpr == LH->getValue())
return LH;
// Generate error if there is a problem with the value.
if (getSema().CheckLoopHintExpr(TransformedExpr, LH->getLocation()))
return LH;
// Create new LoopHintValueAttr with integral expression in place of the
// non-type template parameter.
return LoopHintAttr::CreateImplicit(
getSema().Context, LH->getSemanticSpelling(), LH->getOption(),
LH->getState(), TransformedExpr, LH->getRange());
}
ExprResult TemplateInstantiator::transformNonTypeTemplateParmRef(
NonTypeTemplateParmDecl *parm,
SourceLocation loc,
TemplateArgument arg) {
ExprResult result;
QualType type;
// The template argument itself might be an expression, in which
// case we just return that expression.
if (arg.getKind() == TemplateArgument::Expression) {
Expr *argExpr = arg.getAsExpr();
result = argExpr;
type = argExpr->getType();
} else if (arg.getKind() == TemplateArgument::Declaration ||
arg.getKind() == TemplateArgument::NullPtr) {
ValueDecl *VD;
if (arg.getKind() == TemplateArgument::Declaration) {
VD = cast<ValueDecl>(arg.getAsDecl());
// Find the instantiation of the template argument. This is
// required for nested templates.
VD = cast_or_null<ValueDecl>(
getSema().FindInstantiatedDecl(loc, VD, TemplateArgs));
if (!VD)
return ExprError();
} else {
// Propagate NULL template argument.
VD = nullptr;
}
// Derive the type we want the substituted decl to have. This had
// better be non-dependent, or these checks will have serious problems.
if (parm->isExpandedParameterPack()) {
type = parm->getExpansionType(SemaRef.ArgumentPackSubstitutionIndex);
} else if (parm->isParameterPack() &&
isa<PackExpansionType>(parm->getType())) {
type = SemaRef.SubstType(
cast<PackExpansionType>(parm->getType())->getPattern(),
TemplateArgs, loc, parm->getDeclName());
} else {
type = SemaRef.SubstType(parm->getType(), TemplateArgs,
loc, parm->getDeclName());
}
assert(!type.isNull() && "type substitution failed for param type");
assert(!type->isDependentType() && "param type still dependent");
result = SemaRef.BuildExpressionFromDeclTemplateArgument(arg, type, loc);
if (!result.isInvalid()) type = result.get()->getType();
} else {
result = SemaRef.BuildExpressionFromIntegralTemplateArgument(arg, loc);
// Note that this type can be different from the type of 'result',
// e.g. if it's an enum type.
type = arg.getIntegralType();
}
if (result.isInvalid()) return ExprError();
Expr *resultExpr = result.get();
return new (SemaRef.Context) SubstNonTypeTemplateParmExpr(
type, resultExpr->getValueKind(), loc, parm, resultExpr);
}
ExprResult
TemplateInstantiator::TransformSubstNonTypeTemplateParmPackExpr(
SubstNonTypeTemplateParmPackExpr *E) {
if (getSema().ArgumentPackSubstitutionIndex == -1) {
// We aren't expanding the parameter pack, so just return ourselves.
return E;
}
TemplateArgument Arg = E->getArgumentPack();
Arg = getPackSubstitutedTemplateArgument(getSema(), Arg);
return transformNonTypeTemplateParmRef(E->getParameterPack(),
E->getParameterPackLocation(),
Arg);
}
ExprResult
TemplateInstantiator::RebuildParmVarDeclRefExpr(ParmVarDecl *PD,
SourceLocation Loc) {
DeclarationNameInfo NameInfo(PD->getDeclName(), Loc);
return getSema().BuildDeclarationNameExpr(CXXScopeSpec(), NameInfo, PD);
}
ExprResult
TemplateInstantiator::TransformFunctionParmPackExpr(FunctionParmPackExpr *E) {
if (getSema().ArgumentPackSubstitutionIndex != -1) {
// We can expand this parameter pack now.
ParmVarDecl *D = E->getExpansion(getSema().ArgumentPackSubstitutionIndex);
ValueDecl *VD = cast_or_null<ValueDecl>(TransformDecl(E->getExprLoc(), D));
if (!VD)
return ExprError();
return RebuildParmVarDeclRefExpr(cast<ParmVarDecl>(VD), E->getExprLoc());
}
QualType T = TransformType(E->getType());
if (T.isNull())
return ExprError();
// Transform each of the parameter expansions into the corresponding
// parameters in the instantiation of the function decl.
SmallVector<Decl *, 8> Parms;
Parms.reserve(E->getNumExpansions());
for (FunctionParmPackExpr::iterator I = E->begin(), End = E->end();
I != End; ++I) {
ParmVarDecl *D =
cast_or_null<ParmVarDecl>(TransformDecl(E->getExprLoc(), *I));
if (!D)
return ExprError();
Parms.push_back(D);
}
return FunctionParmPackExpr::Create(getSema().Context, T,
E->getParameterPack(),
E->getParameterPackLocation(), Parms);
}
ExprResult
TemplateInstantiator::TransformFunctionParmPackRefExpr(DeclRefExpr *E,
ParmVarDecl *PD) {
typedef LocalInstantiationScope::DeclArgumentPack DeclArgumentPack;
llvm::PointerUnion<Decl *, DeclArgumentPack *> *Found
= getSema().CurrentInstantiationScope->findInstantiationOf(PD);
assert(Found && "no instantiation for parameter pack");
Decl *TransformedDecl;
if (DeclArgumentPack *Pack = Found->dyn_cast<DeclArgumentPack *>()) {
// If this is a reference to a function parameter pack which we can
// substitute but can't yet expand, build a FunctionParmPackExpr for it.
if (getSema().ArgumentPackSubstitutionIndex == -1) {
QualType T = TransformType(E->getType());
if (T.isNull())
return ExprError();
return FunctionParmPackExpr::Create(getSema().Context, T, PD,
E->getExprLoc(), *Pack);
}
TransformedDecl = (*Pack)[getSema().ArgumentPackSubstitutionIndex];
} else {
TransformedDecl = Found->get<Decl*>();
}
// We have either an unexpanded pack or a specific expansion.
return RebuildParmVarDeclRefExpr(cast<ParmVarDecl>(TransformedDecl),
E->getExprLoc());
}
ExprResult
TemplateInstantiator::TransformDeclRefExpr(DeclRefExpr *E) {
NamedDecl *D = E->getDecl();
// Handle references to non-type template parameters and non-type template
// parameter packs.
if (NonTypeTemplateParmDecl *NTTP = dyn_cast<NonTypeTemplateParmDecl>(D)) {
if (NTTP->getDepth() < TemplateArgs.getNumLevels())
return TransformTemplateParmRefExpr(E, NTTP);
// We have a non-type template parameter that isn't fully substituted;
// FindInstantiatedDecl will find it in the local instantiation scope.
}
// Handle references to function parameter packs.
if (ParmVarDecl *PD = dyn_cast<ParmVarDecl>(D))
if (PD->isParameterPack())
return TransformFunctionParmPackRefExpr(E, PD);
return TreeTransform<TemplateInstantiator>::TransformDeclRefExpr(E);
}
ExprResult TemplateInstantiator::TransformCXXDefaultArgExpr(
CXXDefaultArgExpr *E) {
assert(!cast<FunctionDecl>(E->getParam()->getDeclContext())->
getDescribedFunctionTemplate() &&
"Default arg expressions are never formed in dependent cases.");
return SemaRef.BuildCXXDefaultArgExpr(E->getUsedLocation(),
cast<FunctionDecl>(E->getParam()->getDeclContext()),
E->getParam());
}
template<typename Fn>
QualType TemplateInstantiator::TransformFunctionProtoType(TypeLocBuilder &TLB,
FunctionProtoTypeLoc TL,
CXXRecordDecl *ThisContext,
unsigned ThisTypeQuals,
Fn TransformExceptionSpec) {
// We need a local instantiation scope for this function prototype.
LocalInstantiationScope Scope(SemaRef, /*CombineWithOuterScope=*/true);
return inherited::TransformFunctionProtoType(
TLB, TL, ThisContext, ThisTypeQuals, TransformExceptionSpec);
}
ParmVarDecl *
TemplateInstantiator::TransformFunctionTypeParam(ParmVarDecl *OldParm,
int indexAdjustment,
Optional<unsigned> NumExpansions,
bool ExpectParameterPack) {
return SemaRef.SubstParmVarDecl(OldParm, TemplateArgs, indexAdjustment,
NumExpansions, ExpectParameterPack);
}
QualType
TemplateInstantiator::TransformTemplateTypeParmType(TypeLocBuilder &TLB,
TemplateTypeParmTypeLoc TL) {
const TemplateTypeParmType *T = TL.getTypePtr();
if (T->getDepth() < TemplateArgs.getNumLevels()) {
// Replace the template type parameter with its corresponding
// template argument.
// If the corresponding template argument is NULL or doesn't exist, it's
// because we are performing instantiation from explicitly-specified
// template arguments in a function template class, but there were some
// arguments left unspecified.
if (!TemplateArgs.hasTemplateArgument(T->getDepth(), T->getIndex())) {
TemplateTypeParmTypeLoc NewTL
= TLB.push<TemplateTypeParmTypeLoc>(TL.getType());
NewTL.setNameLoc(TL.getNameLoc());
return TL.getType();
}
TemplateArgument Arg = TemplateArgs(T->getDepth(), T->getIndex());
if (T->isParameterPack()) {
assert(Arg.getKind() == TemplateArgument::Pack &&
"Missing argument pack");
if (getSema().ArgumentPackSubstitutionIndex == -1) {
// We have the template argument pack, but we're not expanding the
// enclosing pack expansion yet. Just save the template argument
// pack for later substitution.
QualType Result
= getSema().Context.getSubstTemplateTypeParmPackType(T, Arg);
SubstTemplateTypeParmPackTypeLoc NewTL
= TLB.push<SubstTemplateTypeParmPackTypeLoc>(Result);
NewTL.setNameLoc(TL.getNameLoc());
return Result;
}
Arg = getPackSubstitutedTemplateArgument(getSema(), Arg);
}
assert(Arg.getKind() == TemplateArgument::Type &&
"Template argument kind mismatch");
QualType Replacement = Arg.getAsType();
// TODO: only do this uniquing once, at the start of instantiation.
QualType Result
= getSema().Context.getSubstTemplateTypeParmType(T, Replacement);
SubstTemplateTypeParmTypeLoc NewTL
= TLB.push<SubstTemplateTypeParmTypeLoc>(Result);
NewTL.setNameLoc(TL.getNameLoc());
return Result;
}
// The template type parameter comes from an inner template (e.g.,
// the template parameter list of a member template inside the
// template we are instantiating). Create a new template type
// parameter with the template "level" reduced by one.
TemplateTypeParmDecl *NewTTPDecl = nullptr;
if (TemplateTypeParmDecl *OldTTPDecl = T->getDecl())
NewTTPDecl = cast_or_null<TemplateTypeParmDecl>(
TransformDecl(TL.getNameLoc(), OldTTPDecl));
QualType Result
= getSema().Context.getTemplateTypeParmType(T->getDepth()
- TemplateArgs.getNumLevels(),
T->getIndex(),
T->isParameterPack(),
NewTTPDecl);
TemplateTypeParmTypeLoc NewTL = TLB.push<TemplateTypeParmTypeLoc>(Result);
NewTL.setNameLoc(TL.getNameLoc());
return Result;
}
QualType
TemplateInstantiator::TransformSubstTemplateTypeParmPackType(
TypeLocBuilder &TLB,
SubstTemplateTypeParmPackTypeLoc TL) {
if (getSema().ArgumentPackSubstitutionIndex == -1) {
// We aren't expanding the parameter pack, so just return ourselves.
SubstTemplateTypeParmPackTypeLoc NewTL
= TLB.push<SubstTemplateTypeParmPackTypeLoc>(TL.getType());
NewTL.setNameLoc(TL.getNameLoc());
return TL.getType();
}
TemplateArgument Arg = TL.getTypePtr()->getArgumentPack();
Arg = getPackSubstitutedTemplateArgument(getSema(), Arg);
QualType Result = Arg.getAsType();
Result = getSema().Context.getSubstTemplateTypeParmType(
TL.getTypePtr()->getReplacedParameter(),
Result);
SubstTemplateTypeParmTypeLoc NewTL
= TLB.push<SubstTemplateTypeParmTypeLoc>(Result);
NewTL.setNameLoc(TL.getNameLoc());
return Result;
}
/// \brief Perform substitution on the type T with a given set of template
/// arguments.
///
/// This routine substitutes the given template arguments into the
/// type T and produces the instantiated type.
///
/// \param T the type into which the template arguments will be
/// substituted. If this type is not dependent, it will be returned
/// immediately.
///
/// \param Args the template arguments that will be
/// substituted for the top-level template parameters within T.
///
/// \param Loc the location in the source code where this substitution
/// is being performed. It will typically be the location of the
/// declarator (if we're instantiating the type of some declaration)
/// or the location of the type in the source code (if, e.g., we're
/// instantiating the type of a cast expression).
///
/// \param Entity the name of the entity associated with a declaration
/// being instantiated (if any). May be empty to indicate that there
/// is no such entity (if, e.g., this is a type that occurs as part of
/// a cast expression) or that the entity has no name (e.g., an
/// unnamed function parameter).
///
/// \returns If the instantiation succeeds, the instantiated
/// type. Otherwise, produces diagnostics and returns a NULL type.
TypeSourceInfo *Sema::SubstType(TypeSourceInfo *T,
const MultiLevelTemplateArgumentList &Args,
SourceLocation Loc,
DeclarationName Entity) {
assert(!ActiveTemplateInstantiations.empty() &&
"Cannot perform an instantiation without some context on the "
"instantiation stack");
if (!T->getType()->isInstantiationDependentType() &&
!T->getType()->isVariablyModifiedType())
return T;
TemplateInstantiator Instantiator(*this, Args, Loc, Entity);
return Instantiator.TransformType(T);
}
TypeSourceInfo *Sema::SubstType(TypeLoc TL,
const MultiLevelTemplateArgumentList &Args,
SourceLocation Loc,
DeclarationName Entity) {
assert(!ActiveTemplateInstantiations.empty() &&
"Cannot perform an instantiation without some context on the "
"instantiation stack");
if (TL.getType().isNull())
return nullptr;
if (!TL.getType()->isInstantiationDependentType() &&
!TL.getType()->isVariablyModifiedType()) {
// FIXME: Make a copy of the TypeLoc data here, so that we can
// return a new TypeSourceInfo. Inefficient!
TypeLocBuilder TLB;
TLB.pushFullCopy(TL);
return TLB.getTypeSourceInfo(Context, TL.getType());
}
TemplateInstantiator Instantiator(*this, Args, Loc, Entity);
TypeLocBuilder TLB;
TLB.reserve(TL.getFullDataSize());
QualType Result = Instantiator.TransformType(TLB, TL);
if (Result.isNull())
return nullptr;
return TLB.getTypeSourceInfo(Context, Result);
}
/// Deprecated form of the above.
QualType Sema::SubstType(QualType T,
const MultiLevelTemplateArgumentList &TemplateArgs,
SourceLocation Loc, DeclarationName Entity) {
assert(!ActiveTemplateInstantiations.empty() &&
"Cannot perform an instantiation without some context on the "
"instantiation stack");
// If T is not a dependent type or a variably-modified type, there
// is nothing to do.
if (!T->isInstantiationDependentType() && !T->isVariablyModifiedType())
return T;
TemplateInstantiator Instantiator(*this, TemplateArgs, Loc, Entity);
return Instantiator.TransformType(T);
}
static bool NeedsInstantiationAsFunctionType(TypeSourceInfo *T) {
if (T->getType()->isInstantiationDependentType() ||
T->getType()->isVariablyModifiedType())
return true;
TypeLoc TL = T->getTypeLoc().IgnoreParens();
if (!TL.getAs<FunctionProtoTypeLoc>())
return false;
FunctionProtoTypeLoc FP = TL.castAs<FunctionProtoTypeLoc>();
for (unsigned I = 0, E = FP.getNumParams(); I != E; ++I) {
ParmVarDecl *P = FP.getParam(I);
// This must be synthesized from a typedef.
if (!P) continue;
// The parameter's type as written might be dependent even if the
// decayed type was not dependent.
if (TypeSourceInfo *TSInfo = P->getTypeSourceInfo())
if (TSInfo->getType()->isInstantiationDependentType())
return true;
// TODO: currently we always rebuild expressions. When we
// properly get lazier about this, we should use the same
// logic to avoid rebuilding prototypes here.
if (P->hasDefaultArg())
return true;
}
return false;
}
/// A form of SubstType intended specifically for instantiating the
/// type of a FunctionDecl. Its purpose is solely to force the
/// instantiation of default-argument expressions and to avoid
/// instantiating an exception-specification.
TypeSourceInfo *Sema::SubstFunctionDeclType(TypeSourceInfo *T,
const MultiLevelTemplateArgumentList &Args,
SourceLocation Loc,
DeclarationName Entity,
CXXRecordDecl *ThisContext,
unsigned ThisTypeQuals) {
assert(!ActiveTemplateInstantiations.empty() &&
"Cannot perform an instantiation without some context on the "
"instantiation stack");
if (!NeedsInstantiationAsFunctionType(T))
return T;
TemplateInstantiator Instantiator(*this, Args, Loc, Entity);
TypeLocBuilder TLB;
TypeLoc TL = T->getTypeLoc();
TLB.reserve(TL.getFullDataSize());
QualType Result;
if (FunctionProtoTypeLoc Proto =
TL.IgnoreParens().getAs<FunctionProtoTypeLoc>()) {
// Instantiate the type, other than its exception specification. The
// exception specification is instantiated in InitFunctionInstantiation
// once we've built the FunctionDecl.
// FIXME: Set the exception specification to EST_Uninstantiated here,
// instead of rebuilding the function type again later.
Result = Instantiator.TransformFunctionProtoType(
TLB, Proto, ThisContext, ThisTypeQuals,
[](FunctionProtoType::ExceptionSpecInfo &ESI,
bool &Changed) { return false; });
} else {
Result = Instantiator.TransformType(TLB, TL);
}
if (Result.isNull())
return nullptr;
return TLB.getTypeSourceInfo(Context, Result);
}
void Sema::SubstExceptionSpec(FunctionDecl *New, const FunctionProtoType *Proto,
const MultiLevelTemplateArgumentList &Args) {
FunctionProtoType::ExceptionSpecInfo ESI =
Proto->getExtProtoInfo().ExceptionSpec;
assert(ESI.Type != EST_Uninstantiated);
TemplateInstantiator Instantiator(*this, Args, New->getLocation(),
New->getDeclName());
SmallVector<QualType, 4> ExceptionStorage;
bool Changed = false;
if (Instantiator.TransformExceptionSpec(
New->getTypeSourceInfo()->getTypeLoc().getLocEnd(), ESI,
ExceptionStorage, Changed))
// On error, recover by dropping the exception specification.
ESI.Type = EST_None;
UpdateExceptionSpec(New, ESI);
}
ParmVarDecl *Sema::SubstParmVarDecl(ParmVarDecl *OldParm,
const MultiLevelTemplateArgumentList &TemplateArgs,
int indexAdjustment,
Optional<unsigned> NumExpansions,
bool ExpectParameterPack) {
TypeSourceInfo *OldDI = OldParm->getTypeSourceInfo();
TypeSourceInfo *NewDI = nullptr;
TypeLoc OldTL = OldDI->getTypeLoc();
if (PackExpansionTypeLoc ExpansionTL = OldTL.getAs<PackExpansionTypeLoc>()) {
// We have a function parameter pack. Substitute into the pattern of the
// expansion.
NewDI = SubstType(ExpansionTL.getPatternLoc(), TemplateArgs,
OldParm->getLocation(), OldParm->getDeclName());
if (!NewDI)
return nullptr;
if (NewDI->getType()->containsUnexpandedParameterPack()) {
// We still have unexpanded parameter packs, which means that
// our function parameter is still a function parameter pack.
// Therefore, make its type a pack expansion type.
NewDI = CheckPackExpansion(NewDI, ExpansionTL.getEllipsisLoc(),
NumExpansions);
} else if (ExpectParameterPack) {
// We expected to get a parameter pack but didn't (because the type
// itself is not a pack expansion type), so complain. This can occur when
// the substitution goes through an alias template that "loses" the
// pack expansion.
Diag(OldParm->getLocation(),
diag::err_function_parameter_pack_without_parameter_packs)
<< NewDI->getType();
return nullptr;
}
} else {
NewDI = SubstType(OldDI, TemplateArgs, OldParm->getLocation(),
OldParm->getDeclName());
}
if (!NewDI)
return nullptr;
if (NewDI->getType()->isVoidType()) {
Diag(OldParm->getLocation(), diag::err_param_with_void_type);
return nullptr;
}
ParmVarDecl *NewParm = CheckParameter(Context.getTranslationUnitDecl(),
OldParm->getInnerLocStart(),
OldParm->getLocation(),
OldParm->getIdentifier(),
NewDI->getType(), NewDI,
OldParm->getStorageClass());
if (!NewParm)
return nullptr;
// Mark the (new) default argument as uninstantiated (if any).
if (OldParm->hasUninstantiatedDefaultArg()) {
Expr *Arg = OldParm->getUninstantiatedDefaultArg();
NewParm->setUninstantiatedDefaultArg(Arg);
} else if (OldParm->hasUnparsedDefaultArg()) {
NewParm->setUnparsedDefaultArg();
UnparsedDefaultArgInstantiations[OldParm].push_back(NewParm);
} else if (Expr *Arg = OldParm->getDefaultArg())
// FIXME: if we non-lazily instantiated non-dependent default args for
// non-dependent parameter types we could remove a bunch of duplicate
// conversion warnings for such arguments.
NewParm->setUninstantiatedDefaultArg(Arg);
NewParm->setHasInheritedDefaultArg(OldParm->hasInheritedDefaultArg());
if (OldParm->isParameterPack() && !NewParm->isParameterPack()) {
// Add the new parameter to the instantiated parameter pack.
CurrentInstantiationScope->InstantiatedLocalPackArg(OldParm, NewParm);
} else {
// Introduce an Old -> New mapping
CurrentInstantiationScope->InstantiatedLocal(OldParm, NewParm);
}
// FIXME: OldParm may come from a FunctionProtoType, in which case CurContext
// can be anything, is this right ?
NewParm->setDeclContext(CurContext);
NewParm->setScopeInfo(OldParm->getFunctionScopeDepth(),
OldParm->getFunctionScopeIndex() + indexAdjustment);
InstantiateAttrs(TemplateArgs, OldParm, NewParm);
return NewParm;
}
/// \brief Substitute the given template arguments into the given set of
/// parameters, producing the set of parameter types that would be generated
/// from such a substitution.
bool Sema::SubstParmTypes(SourceLocation Loc,
ParmVarDecl **Params, unsigned NumParams,
const MultiLevelTemplateArgumentList &TemplateArgs,
SmallVectorImpl<QualType> &ParamTypes,
SmallVectorImpl<ParmVarDecl *> *OutParams) {
assert(!ActiveTemplateInstantiations.empty() &&
"Cannot perform an instantiation without some context on the "
"instantiation stack");
TemplateInstantiator Instantiator(*this, TemplateArgs, Loc,
DeclarationName());
return Instantiator.TransformFunctionTypeParams(Loc, Params, NumParams,
nullptr, ParamTypes,
OutParams);
}
/// \brief Perform substitution on the base class specifiers of the
/// given class template specialization.
///
/// Produces a diagnostic and returns true on error, returns false and
/// attaches the instantiated base classes to the class template
/// specialization if successful.
bool
Sema::SubstBaseSpecifiers(CXXRecordDecl *Instantiation,
CXXRecordDecl *Pattern,
const MultiLevelTemplateArgumentList &TemplateArgs) {
bool Invalid = false;
SmallVector<CXXBaseSpecifier*, 4> InstantiatedBases;
for (const auto Base : Pattern->bases()) {
if (!Base.getType()->isDependentType()) {
if (const CXXRecordDecl *RD = Base.getType()->getAsCXXRecordDecl()) {
if (RD->isInvalidDecl())
Instantiation->setInvalidDecl();
}
InstantiatedBases.push_back(new (Context) CXXBaseSpecifier(Base));
continue;
}
SourceLocation EllipsisLoc;
TypeSourceInfo *BaseTypeLoc;
if (Base.isPackExpansion()) {
// This is a pack expansion. See whether we should expand it now, or
// wait until later.
SmallVector<UnexpandedParameterPack, 2> Unexpanded;
collectUnexpandedParameterPacks(Base.getTypeSourceInfo()->getTypeLoc(),
Unexpanded);
bool ShouldExpand = false;
bool RetainExpansion = false;
Optional<unsigned> NumExpansions;
if (CheckParameterPacksForExpansion(Base.getEllipsisLoc(),
Base.getSourceRange(),
Unexpanded,
TemplateArgs, ShouldExpand,
RetainExpansion,
NumExpansions)) {
Invalid = true;
continue;
}
// If we should expand this pack expansion now, do so.
if (ShouldExpand) {
for (unsigned I = 0; I != *NumExpansions; ++I) {
Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(*this, I);
TypeSourceInfo *BaseTypeLoc = SubstType(Base.getTypeSourceInfo(),
TemplateArgs,
Base.getSourceRange().getBegin(),
DeclarationName());
if (!BaseTypeLoc) {
Invalid = true;
continue;
}
if (CXXBaseSpecifier *InstantiatedBase
= CheckBaseSpecifier(Instantiation,
Base.getSourceRange(),
Base.isVirtual(),
Base.getAccessSpecifierAsWritten(),
BaseTypeLoc,
SourceLocation()))
InstantiatedBases.push_back(InstantiatedBase);
else
Invalid = true;
}
continue;
}
// The resulting base specifier will (still) be a pack expansion.
EllipsisLoc = Base.getEllipsisLoc();
Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(*this, -1);
BaseTypeLoc = SubstType(Base.getTypeSourceInfo(),
TemplateArgs,
Base.getSourceRange().getBegin(),
DeclarationName());
} else {
BaseTypeLoc = SubstType(Base.getTypeSourceInfo(),
TemplateArgs,
Base.getSourceRange().getBegin(),
DeclarationName());
}
if (!BaseTypeLoc) {
Invalid = true;
continue;
}
if (CXXBaseSpecifier *InstantiatedBase
= CheckBaseSpecifier(Instantiation,
Base.getSourceRange(),
Base.isVirtual(),
Base.getAccessSpecifierAsWritten(),
BaseTypeLoc,
EllipsisLoc))
InstantiatedBases.push_back(InstantiatedBase);
else
Invalid = true;
}
if (!Invalid &&
AttachBaseSpecifiers(Instantiation, InstantiatedBases.data(),
InstantiatedBases.size()))
Invalid = true;
return Invalid;
}
// Defined via #include from SemaTemplateInstantiateDecl.cpp
namespace clang {
namespace sema {
Attr *instantiateTemplateAttribute(const Attr *At, ASTContext &C, Sema &S,
const MultiLevelTemplateArgumentList &TemplateArgs);
}
}
/// Determine whether we would be unable to instantiate this template (because
/// it either has no definition, or is in the process of being instantiated).
static bool DiagnoseUninstantiableTemplate(Sema &S,
SourceLocation PointOfInstantiation,
TagDecl *Instantiation,
bool InstantiatedFromMember,
TagDecl *Pattern,
TagDecl *PatternDef,
TemplateSpecializationKind TSK,
bool Complain = true) {
if (PatternDef && !PatternDef->isBeingDefined())
return false;
if (!Complain || (PatternDef && PatternDef->isInvalidDecl())) {
// Say nothing
} else if (PatternDef) {
assert(PatternDef->isBeingDefined());
S.Diag(PointOfInstantiation,
diag::err_template_instantiate_within_definition)
<< (TSK != TSK_ImplicitInstantiation)
<< S.Context.getTypeDeclType(Instantiation);
// Not much point in noting the template declaration here, since
// we're lexically inside it.
Instantiation->setInvalidDecl();
} else if (InstantiatedFromMember) {
S.Diag(PointOfInstantiation,
diag::err_implicit_instantiate_member_undefined)
<< S.Context.getTypeDeclType(Instantiation);
S.Diag(Pattern->getLocation(), diag::note_member_declared_at);
} else {
S.Diag(PointOfInstantiation, diag::err_template_instantiate_undefined)
<< (TSK != TSK_ImplicitInstantiation)
<< S.Context.getTypeDeclType(Instantiation);
S.Diag(Pattern->getLocation(), diag::note_template_decl_here);
}
// In general, Instantiation isn't marked invalid to get more than one
// error for multiple undefined instantiations. But the code that does
// explicit declaration -> explicit definition conversion can't handle
// invalid declarations, so mark as invalid in that case.
if (TSK == TSK_ExplicitInstantiationDeclaration)
Instantiation->setInvalidDecl();
return true;
}
/// \brief Instantiate the definition of a class from a given pattern.
///
/// \param PointOfInstantiation The point of instantiation within the
/// source code.
///
/// \param Instantiation is the declaration whose definition is being
/// instantiated. This will be either a class template specialization
/// or a member class of a class template specialization.
///
/// \param Pattern is the pattern from which the instantiation
/// occurs. This will be either the declaration of a class template or
/// the declaration of a member class of a class template.
///
/// \param TemplateArgs The template arguments to be substituted into
/// the pattern.
///
/// \param TSK the kind of implicit or explicit instantiation to perform.
///
/// \param Complain whether to complain if the class cannot be instantiated due
/// to the lack of a definition.
///
/// \returns true if an error occurred, false otherwise.
bool
Sema::InstantiateClass(SourceLocation PointOfInstantiation,
CXXRecordDecl *Instantiation, CXXRecordDecl *Pattern,
const MultiLevelTemplateArgumentList &TemplateArgs,
TemplateSpecializationKind TSK,
bool Complain) {
CXXRecordDecl *PatternDef
= cast_or_null<CXXRecordDecl>(Pattern->getDefinition());
if (DiagnoseUninstantiableTemplate(*this, PointOfInstantiation, Instantiation,
Instantiation->getInstantiatedFromMemberClass(),
Pattern, PatternDef, TSK, Complain))
return true;
Pattern = PatternDef;
// \brief Record the point of instantiation.
if (MemberSpecializationInfo *MSInfo
= Instantiation->getMemberSpecializationInfo()) {
MSInfo->setTemplateSpecializationKind(TSK);
MSInfo->setPointOfInstantiation(PointOfInstantiation);
} else if (ClassTemplateSpecializationDecl *Spec
= dyn_cast<ClassTemplateSpecializationDecl>(Instantiation)) {
Spec->setTemplateSpecializationKind(TSK);
Spec->setPointOfInstantiation(PointOfInstantiation);
}
InstantiatingTemplate Inst(*this, PointOfInstantiation, Instantiation);
if (Inst.isInvalid())
return true;
// Enter the scope of this instantiation. We don't use
// PushDeclContext because we don't have a scope.
ContextRAII SavedContext(*this, Instantiation);
EnterExpressionEvaluationContext EvalContext(*this,
Sema::PotentiallyEvaluated);
// If this is an instantiation of a local class, merge this local
// instantiation scope with the enclosing scope. Otherwise, every
// instantiation of a class has its own local instantiation scope.
bool MergeWithParentScope = !Instantiation->isDefinedOutsideFunctionOrMethod();
LocalInstantiationScope Scope(*this, MergeWithParentScope);
// Pull attributes from the pattern onto the instantiation.
InstantiateAttrs(TemplateArgs, Pattern, Instantiation);
// Start the definition of this instantiation.
Instantiation->startDefinition();
// The instantiation is visible here, even if it was first declared in an
// unimported module.
Instantiation->setHidden(false);
// FIXME: This loses the as-written tag kind for an explicit instantiation.
Instantiation->setTagKind(Pattern->getTagKind());
// Do substitution on the base class specifiers.
if (SubstBaseSpecifiers(Instantiation, Pattern, TemplateArgs))
Instantiation->setInvalidDecl();
TemplateDeclInstantiator Instantiator(*this, Instantiation, TemplateArgs);
SmallVector<Decl*, 4> Fields;
// Delay instantiation of late parsed attributes.
LateInstantiatedAttrVec LateAttrs;
Instantiator.enableLateAttributeInstantiation(&LateAttrs);
for (auto *Member : Pattern->decls()) {
// Don't instantiate members not belonging in this semantic context.
// e.g. for:
// @code
// template <int i> class A {
// class B *g;
// };
// @endcode
// 'class B' has the template as lexical context but semantically it is
// introduced in namespace scope.
if (Member->getDeclContext() != Pattern)
continue;
if (Member->isInvalidDecl()) {
Instantiation->setInvalidDecl();
continue;
}
Decl *NewMember = Instantiator.Visit(Member);
if (NewMember) {
if (FieldDecl *Field = dyn_cast<FieldDecl>(NewMember)) {
Fields.push_back(Field);
} else if (EnumDecl *Enum = dyn_cast<EnumDecl>(NewMember)) {
// C++11 [temp.inst]p1: The implicit instantiation of a class template
// specialization causes the implicit instantiation of the definitions
// of unscoped member enumerations.
// Record a point of instantiation for this implicit instantiation.
if (TSK == TSK_ImplicitInstantiation && !Enum->isScoped() &&
Enum->isCompleteDefinition()) {
MemberSpecializationInfo *MSInfo =Enum->getMemberSpecializationInfo();
assert(MSInfo && "no spec info for member enum specialization");
MSInfo->setTemplateSpecializationKind(TSK_ImplicitInstantiation);
MSInfo->setPointOfInstantiation(PointOfInstantiation);
}
} else if (StaticAssertDecl *SA = dyn_cast<StaticAssertDecl>(NewMember)) {
if (SA->isFailed()) {
// A static_assert failed. Bail out; instantiating this
// class is probably not meaningful.
Instantiation->setInvalidDecl();
break;
}
}
if (NewMember->isInvalidDecl())
Instantiation->setInvalidDecl();
} else {
// FIXME: Eventually, a NULL return will mean that one of the
// instantiations was a semantic disaster, and we'll want to mark the
// declaration invalid.
// For now, we expect to skip some members that we can't yet handle.
}
}
// Finish checking fields.
ActOnFields(nullptr, Instantiation->getLocation(), Instantiation, Fields,
SourceLocation(), SourceLocation(), nullptr);
CheckCompletedCXXClass(Instantiation);
// Instantiate late parsed attributes, and attach them to their decls.
// See Sema::InstantiateAttrs
for (LateInstantiatedAttrVec::iterator I = LateAttrs.begin(),
E = LateAttrs.end(); I != E; ++I) {
assert(CurrentInstantiationScope == Instantiator.getStartingScope());
CurrentInstantiationScope = I->Scope;
// Allow 'this' within late-parsed attributes.
NamedDecl *ND = dyn_cast<NamedDecl>(I->NewDecl);
CXXRecordDecl *ThisContext =
dyn_cast_or_null<CXXRecordDecl>(ND->getDeclContext());
CXXThisScopeRAII ThisScope(*this, ThisContext, /*TypeQuals*/0,
ND && ND->isCXXInstanceMember());
Attr *NewAttr =
instantiateTemplateAttribute(I->TmplAttr, Context, *this, TemplateArgs);
I->NewDecl->addAttr(NewAttr);
LocalInstantiationScope::deleteScopes(I->Scope,
Instantiator.getStartingScope());
}
Instantiator.disableLateAttributeInstantiation();
LateAttrs.clear();
ActOnFinishDelayedMemberInitializers(Instantiation);
// FIXME: We should do something similar for explicit instantiations so they
// end up in the right module.
if (TSK == TSK_ImplicitInstantiation) {
Instantiation->setLocation(Pattern->getLocation());
Instantiation->setLocStart(Pattern->getInnerLocStart());
Instantiation->setRBraceLoc(Pattern->getRBraceLoc());
}
if (!Instantiation->isInvalidDecl()) {
// Perform any dependent diagnostics from the pattern.
PerformDependentDiagnostics(Pattern, TemplateArgs);
// Instantiate any out-of-line class template partial
// specializations now.
for (TemplateDeclInstantiator::delayed_partial_spec_iterator
P = Instantiator.delayed_partial_spec_begin(),
PEnd = Instantiator.delayed_partial_spec_end();
P != PEnd; ++P) {
if (!Instantiator.InstantiateClassTemplatePartialSpecialization(
P->first, P->second)) {
Instantiation->setInvalidDecl();
break;
}
}
// Instantiate any out-of-line variable template partial
// specializations now.
for (TemplateDeclInstantiator::delayed_var_partial_spec_iterator
P = Instantiator.delayed_var_partial_spec_begin(),
PEnd = Instantiator.delayed_var_partial_spec_end();
P != PEnd; ++P) {
if (!Instantiator.InstantiateVarTemplatePartialSpecialization(
P->first, P->second)) {
Instantiation->setInvalidDecl();
break;
}
}
}
// Exit the scope of this instantiation.
SavedContext.pop();
if (!Instantiation->isInvalidDecl()) {
Consumer.HandleTagDeclDefinition(Instantiation);
// Always emit the vtable for an explicit instantiation definition
// of a polymorphic class template specialization.
if (TSK == TSK_ExplicitInstantiationDefinition)
MarkVTableUsed(PointOfInstantiation, Instantiation, true);
}
return Instantiation->isInvalidDecl();
}
/// \brief Instantiate the definition of an enum from a given pattern.
///
/// \param PointOfInstantiation The point of instantiation within the
/// source code.
/// \param Instantiation is the declaration whose definition is being
/// instantiated. This will be a member enumeration of a class
/// temploid specialization, or a local enumeration within a
/// function temploid specialization.
/// \param Pattern The templated declaration from which the instantiation
/// occurs.
/// \param TemplateArgs The template arguments to be substituted into
/// the pattern.
/// \param TSK The kind of implicit or explicit instantiation to perform.
///
/// \return \c true if an error occurred, \c false otherwise.
bool Sema::InstantiateEnum(SourceLocation PointOfInstantiation,
EnumDecl *Instantiation, EnumDecl *Pattern,
const MultiLevelTemplateArgumentList &TemplateArgs,
TemplateSpecializationKind TSK) {
EnumDecl *PatternDef = Pattern->getDefinition();
if (DiagnoseUninstantiableTemplate(*this, PointOfInstantiation, Instantiation,
Instantiation->getInstantiatedFromMemberEnum(),
Pattern, PatternDef, TSK,/*Complain*/true))
return true;
Pattern = PatternDef;
// Record the point of instantiation.
if (MemberSpecializationInfo *MSInfo
= Instantiation->getMemberSpecializationInfo()) {
MSInfo->setTemplateSpecializationKind(TSK);
MSInfo->setPointOfInstantiation(PointOfInstantiation);
}
InstantiatingTemplate Inst(*this, PointOfInstantiation, Instantiation);
if (Inst.isInvalid())
return true;
// The instantiation is visible here, even if it was first declared in an
// unimported module.
Instantiation->setHidden(false);
// Enter the scope of this instantiation. We don't use
// PushDeclContext because we don't have a scope.
ContextRAII SavedContext(*this, Instantiation);
EnterExpressionEvaluationContext EvalContext(*this,
Sema::PotentiallyEvaluated);
LocalInstantiationScope Scope(*this, /*MergeWithParentScope*/true);
// Pull attributes from the pattern onto the instantiation.
InstantiateAttrs(TemplateArgs, Pattern, Instantiation);
TemplateDeclInstantiator Instantiator(*this, Instantiation, TemplateArgs);
Instantiator.InstantiateEnumDefinition(Instantiation, Pattern);
// Exit the scope of this instantiation.
SavedContext.pop();
return Instantiation->isInvalidDecl();
}
/// \brief Instantiate the definition of a field from the given pattern.
///
/// \param PointOfInstantiation The point of instantiation within the
/// source code.
/// \param Instantiation is the declaration whose definition is being
/// instantiated. This will be a class of a class temploid
/// specialization, or a local enumeration within a function temploid
/// specialization.
/// \param Pattern The templated declaration from which the instantiation
/// occurs.
/// \param TemplateArgs The template arguments to be substituted into
/// the pattern.
///
/// \return \c true if an error occurred, \c false otherwise.
bool Sema::InstantiateInClassInitializer(
SourceLocation PointOfInstantiation, FieldDecl *Instantiation,
FieldDecl *Pattern, const MultiLevelTemplateArgumentList &TemplateArgs) {
// If there is no initializer, we don't need to do anything.
if (!Pattern->hasInClassInitializer())
return false;
assert(Instantiation->getInClassInitStyle() ==
Pattern->getInClassInitStyle() &&
"pattern and instantiation disagree about init style");
// Error out if we haven't parsed the initializer of the pattern yet because
// we are waiting for the closing brace of the outer class.
Expr *OldInit = Pattern->getInClassInitializer();
if (!OldInit) {
RecordDecl *PatternRD = Pattern->getParent();
RecordDecl *OutermostClass = PatternRD->getOuterLexicalRecordContext();
if (OutermostClass == PatternRD) {
Diag(Pattern->getLocEnd(), diag::err_in_class_initializer_not_yet_parsed)
<< PatternRD << Pattern;
} else {
Diag(Pattern->getLocEnd(),
diag::err_in_class_initializer_not_yet_parsed_outer_class)
<< PatternRD << OutermostClass << Pattern;
}
Instantiation->setInvalidDecl();
return true;
}
InstantiatingTemplate Inst(*this, PointOfInstantiation, Instantiation);
if (Inst.isInvalid())
return true;
// Enter the scope of this instantiation. We don't use PushDeclContext because
// we don't have a scope.
ContextRAII SavedContext(*this, Instantiation->getParent());
EnterExpressionEvaluationContext EvalContext(*this,
Sema::PotentiallyEvaluated);
LocalInstantiationScope Scope(*this);
// Instantiate the initializer.
ActOnStartCXXInClassMemberInitializer();
CXXThisScopeRAII ThisScope(*this, Instantiation->getParent(), /*TypeQuals=*/0);
ExprResult NewInit = SubstInitializer(OldInit, TemplateArgs,
/*CXXDirectInit=*/false);
Expr *Init = NewInit.get();
assert((!Init || !isa<ParenListExpr>(Init)) && "call-style init in class");
ActOnFinishCXXInClassMemberInitializer(
Instantiation, Init ? Init->getLocStart() : SourceLocation(), Init);
// Exit the scope of this instantiation.
SavedContext.pop();
// Return true if the in-class initializer is still missing.
return !Instantiation->getInClassInitializer();
}
namespace {
/// \brief A partial specialization whose template arguments have matched
/// a given template-id.
struct PartialSpecMatchResult {
ClassTemplatePartialSpecializationDecl *Partial;
TemplateArgumentList *Args;
};
}
bool Sema::InstantiateClassTemplateSpecialization(
SourceLocation PointOfInstantiation,
ClassTemplateSpecializationDecl *ClassTemplateSpec,
TemplateSpecializationKind TSK, bool Complain) {
// Perform the actual instantiation on the canonical declaration.
ClassTemplateSpec = cast<ClassTemplateSpecializationDecl>(
ClassTemplateSpec->getCanonicalDecl());
// Check whether we have already instantiated or specialized this class
// template specialization.
if (ClassTemplateSpec->getSpecializationKind() != TSK_Undeclared) {
if (ClassTemplateSpec->getSpecializationKind() ==
TSK_ExplicitInstantiationDeclaration &&
TSK == TSK_ExplicitInstantiationDefinition) {
// An explicit instantiation definition follows an explicit instantiation
// declaration (C++0x [temp.explicit]p10); go ahead and perform the
// explicit instantiation.
ClassTemplateSpec->setSpecializationKind(TSK);
// If this is an explicit instantiation definition, mark the
// vtable as used.
if (TSK == TSK_ExplicitInstantiationDefinition &&
!ClassTemplateSpec->isInvalidDecl())
MarkVTableUsed(PointOfInstantiation, ClassTemplateSpec, true);
return false;
}
// We can only instantiate something that hasn't already been
// instantiated or specialized. Fail without any diagnostics: our
// caller will provide an error message.
return true;
}
if (ClassTemplateSpec->isInvalidDecl())
return true;
ClassTemplateDecl *Template = ClassTemplateSpec->getSpecializedTemplate();
CXXRecordDecl *Pattern = nullptr;
// C++ [temp.class.spec.match]p1:
// When a class template is used in a context that requires an
// instantiation of the class, it is necessary to determine
// whether the instantiation is to be generated using the primary
// template or one of the partial specializations. This is done by
// matching the template arguments of the class template
// specialization with the template argument lists of the partial
// specializations.
typedef PartialSpecMatchResult MatchResult;
SmallVector<MatchResult, 4> Matched;
SmallVector<ClassTemplatePartialSpecializationDecl *, 4> PartialSpecs;
Template->getPartialSpecializations(PartialSpecs);
TemplateSpecCandidateSet FailedCandidates(PointOfInstantiation);
for (unsigned I = 0, N = PartialSpecs.size(); I != N; ++I) {
ClassTemplatePartialSpecializationDecl *Partial = PartialSpecs[I];
TemplateDeductionInfo Info(FailedCandidates.getLocation());
if (TemplateDeductionResult Result
= DeduceTemplateArguments(Partial,
ClassTemplateSpec->getTemplateArgs(),
Info)) {
// Store the failed-deduction information for use in diagnostics, later.
// TODO: Actually use the failed-deduction info?
FailedCandidates.addCandidate()
.set(Partial, MakeDeductionFailureInfo(Context, Result, Info));
(void)Result;
} else {
Matched.push_back(PartialSpecMatchResult());
Matched.back().Partial = Partial;
Matched.back().Args = Info.take();
}
}
// If we're dealing with a member template where the template parameters
// have been instantiated, this provides the original template parameters
// from which the member template's parameters were instantiated.
if (Matched.size() >= 1) {
SmallVectorImpl<MatchResult>::iterator Best = Matched.begin();
if (Matched.size() == 1) {
// -- If exactly one matching specialization is found, the
// instantiation is generated from that specialization.
// We don't need to do anything for this.
} else {
// -- If more than one matching specialization is found, the
// partial order rules (14.5.4.2) are used to determine
// whether one of the specializations is more specialized
// than the others. If none of the specializations is more
// specialized than all of the other matching
// specializations, then the use of the class template is
// ambiguous and the program is ill-formed.
for (SmallVectorImpl<MatchResult>::iterator P = Best + 1,
PEnd = Matched.end();
P != PEnd; ++P) {
if (getMoreSpecializedPartialSpecialization(P->Partial, Best->Partial,
PointOfInstantiation)
== P->Partial)
Best = P;
}
// Determine if the best partial specialization is more specialized than
// the others.
bool Ambiguous = false;
for (SmallVectorImpl<MatchResult>::iterator P = Matched.begin(),
PEnd = Matched.end();
P != PEnd; ++P) {
if (P != Best &&
getMoreSpecializedPartialSpecialization(P->Partial, Best->Partial,
PointOfInstantiation)
!= Best->Partial) {
Ambiguous = true;
break;
}
}
if (Ambiguous) {
// Partial ordering did not produce a clear winner. Complain.
ClassTemplateSpec->setInvalidDecl();
Diag(PointOfInstantiation, diag::err_partial_spec_ordering_ambiguous)
<< ClassTemplateSpec;
// Print the matching partial specializations.
for (SmallVectorImpl<MatchResult>::iterator P = Matched.begin(),
PEnd = Matched.end();
P != PEnd; ++P)
Diag(P->Partial->getLocation(), diag::note_partial_spec_match)
<< getTemplateArgumentBindingsText(
P->Partial->getTemplateParameters(),
*P->Args);
return true;
}
}
// Instantiate using the best class template partial specialization.
ClassTemplatePartialSpecializationDecl *OrigPartialSpec = Best->Partial;
while (OrigPartialSpec->getInstantiatedFromMember()) {
// If we've found an explicit specialization of this class template,
// stop here and use that as the pattern.
if (OrigPartialSpec->isMemberSpecialization())
break;
OrigPartialSpec = OrigPartialSpec->getInstantiatedFromMember();
}
Pattern = OrigPartialSpec;
ClassTemplateSpec->setInstantiationOf(Best->Partial, Best->Args);
} else {
// -- If no matches are found, the instantiation is generated
// from the primary template.
ClassTemplateDecl *OrigTemplate = Template;
while (OrigTemplate->getInstantiatedFromMemberTemplate()) {
// If we've found an explicit specialization of this class template,
// stop here and use that as the pattern.
if (OrigTemplate->isMemberSpecialization())
break;
OrigTemplate = OrigTemplate->getInstantiatedFromMemberTemplate();
}
Pattern = OrigTemplate->getTemplatedDecl();
}
bool Result = InstantiateClass(PointOfInstantiation, ClassTemplateSpec,
Pattern,
getTemplateInstantiationArgs(ClassTemplateSpec),
TSK,
Complain);
return Result;
}
/// \brief Instantiates the definitions of all of the member
/// of the given class, which is an instantiation of a class template
/// or a member class of a template.
void
Sema::InstantiateClassMembers(SourceLocation PointOfInstantiation,
CXXRecordDecl *Instantiation,
const MultiLevelTemplateArgumentList &TemplateArgs,
TemplateSpecializationKind TSK) {
// FIXME: We need to notify the ASTMutationListener that we did all of these
// things, in case we have an explicit instantiation definition in a PCM, a
// module, or preamble, and the declaration is in an imported AST.
assert(
(TSK == TSK_ExplicitInstantiationDefinition ||
TSK == TSK_ExplicitInstantiationDeclaration ||
(TSK == TSK_ImplicitInstantiation && Instantiation->isLocalClass())) &&
"Unexpected template specialization kind!");
for (auto *D : Instantiation->decls()) {
bool SuppressNew = false;
if (auto *Function = dyn_cast<FunctionDecl>(D)) {
if (FunctionDecl *Pattern
= Function->getInstantiatedFromMemberFunction()) {
MemberSpecializationInfo *MSInfo
= Function->getMemberSpecializationInfo();
assert(MSInfo && "No member specialization information?");
if (MSInfo->getTemplateSpecializationKind()
== TSK_ExplicitSpecialization)
continue;
if (CheckSpecializationInstantiationRedecl(PointOfInstantiation, TSK,
Function,
MSInfo->getTemplateSpecializationKind(),
MSInfo->getPointOfInstantiation(),
SuppressNew) ||
SuppressNew)
continue;
// C++11 [temp.explicit]p8:
// An explicit instantiation definition that names a class template
// specialization explicitly instantiates the class template
// specialization and is only an explicit instantiation definition
// of members whose definition is visible at the point of
// instantiation.
if (TSK == TSK_ExplicitInstantiationDefinition && !Pattern->isDefined())
continue;
Function->setTemplateSpecializationKind(TSK, PointOfInstantiation);
if (Function->isDefined()) {
// Let the ASTConsumer know that this function has been explicitly
// instantiated now, and its linkage might have changed.
Consumer.HandleTopLevelDecl(DeclGroupRef(Function));
} else if (TSK == TSK_ExplicitInstantiationDefinition) {
InstantiateFunctionDefinition(PointOfInstantiation, Function);
} else if (TSK == TSK_ImplicitInstantiation) {
PendingLocalImplicitInstantiations.push_back(
std::make_pair(Function, PointOfInstantiation));
}
}
} else if (auto *Var = dyn_cast<VarDecl>(D)) {
if (isa<VarTemplateSpecializationDecl>(Var))
continue;
if (Var->isStaticDataMember()) {
MemberSpecializationInfo *MSInfo = Var->getMemberSpecializationInfo();
assert(MSInfo && "No member specialization information?");
if (MSInfo->getTemplateSpecializationKind()
== TSK_ExplicitSpecialization)
continue;
if (CheckSpecializationInstantiationRedecl(PointOfInstantiation, TSK,
Var,
MSInfo->getTemplateSpecializationKind(),
MSInfo->getPointOfInstantiation(),
SuppressNew) ||
SuppressNew)
continue;
if (TSK == TSK_ExplicitInstantiationDefinition) {
// C++0x [temp.explicit]p8:
// An explicit instantiation definition that names a class template
// specialization explicitly instantiates the class template
// specialization and is only an explicit instantiation definition
// of members whose definition is visible at the point of
// instantiation.
if (!Var->getInstantiatedFromStaticDataMember()
->getOutOfLineDefinition())
continue;
Var->setTemplateSpecializationKind(TSK, PointOfInstantiation);
InstantiateStaticDataMemberDefinition(PointOfInstantiation, Var);
} else {
Var->setTemplateSpecializationKind(TSK, PointOfInstantiation);
}
}
} else if (auto *Record = dyn_cast<CXXRecordDecl>(D)) {
// Always skip the injected-class-name, along with any
// redeclarations of nested classes, since both would cause us
// to try to instantiate the members of a class twice.
// Skip closure types; they'll get instantiated when we instantiate
// the corresponding lambda-expression.
if (Record->isInjectedClassName() || Record->getPreviousDecl() ||
Record->isLambda())
continue;
MemberSpecializationInfo *MSInfo = Record->getMemberSpecializationInfo();
assert(MSInfo && "No member specialization information?");
if (MSInfo->getTemplateSpecializationKind()
== TSK_ExplicitSpecialization)
continue;
if (CheckSpecializationInstantiationRedecl(PointOfInstantiation, TSK,
Record,
MSInfo->getTemplateSpecializationKind(),
MSInfo->getPointOfInstantiation(),
SuppressNew) ||
SuppressNew)
continue;
CXXRecordDecl *Pattern = Record->getInstantiatedFromMemberClass();
assert(Pattern && "Missing instantiated-from-template information");
if (!Record->getDefinition()) {
if (!Pattern->getDefinition()) {
// C++0x [temp.explicit]p8:
// An explicit instantiation definition that names a class template
// specialization explicitly instantiates the class template
// specialization and is only an explicit instantiation definition
// of members whose definition is visible at the point of
// instantiation.
if (TSK == TSK_ExplicitInstantiationDeclaration) {
MSInfo->setTemplateSpecializationKind(TSK);
MSInfo->setPointOfInstantiation(PointOfInstantiation);
}
continue;
}
InstantiateClass(PointOfInstantiation, Record, Pattern,
TemplateArgs,
TSK);
} else {
if (TSK == TSK_ExplicitInstantiationDefinition &&
Record->getTemplateSpecializationKind() ==
TSK_ExplicitInstantiationDeclaration) {
Record->setTemplateSpecializationKind(TSK);
MarkVTableUsed(PointOfInstantiation, Record, true);
}
}
Pattern = cast_or_null<CXXRecordDecl>(Record->getDefinition());
if (Pattern)
InstantiateClassMembers(PointOfInstantiation, Pattern, TemplateArgs,
TSK);
} else if (auto *Enum = dyn_cast<EnumDecl>(D)) {
MemberSpecializationInfo *MSInfo = Enum->getMemberSpecializationInfo();
assert(MSInfo && "No member specialization information?");
if (MSInfo->getTemplateSpecializationKind()
== TSK_ExplicitSpecialization)
continue;
if (CheckSpecializationInstantiationRedecl(
PointOfInstantiation, TSK, Enum,
MSInfo->getTemplateSpecializationKind(),
MSInfo->getPointOfInstantiation(), SuppressNew) ||
SuppressNew)
continue;
if (Enum->getDefinition())
continue;
EnumDecl *Pattern = Enum->getInstantiatedFromMemberEnum();
assert(Pattern && "Missing instantiated-from-template information");
if (TSK == TSK_ExplicitInstantiationDefinition) {
if (!Pattern->getDefinition())
continue;
InstantiateEnum(PointOfInstantiation, Enum, Pattern, TemplateArgs, TSK);
} else {
MSInfo->setTemplateSpecializationKind(TSK);
MSInfo->setPointOfInstantiation(PointOfInstantiation);
}
} else if (auto *Field = dyn_cast<FieldDecl>(D)) {
// No need to instantiate in-class initializers during explicit
// instantiation.
if (Field->hasInClassInitializer() && TSK == TSK_ImplicitInstantiation) {
CXXRecordDecl *ClassPattern =
Instantiation->getTemplateInstantiationPattern();
DeclContext::lookup_result Lookup =
ClassPattern->lookup(Field->getDeclName());
assert(Lookup.size() == 1);
FieldDecl *Pattern = cast<FieldDecl>(Lookup[0]);
InstantiateInClassInitializer(PointOfInstantiation, Field, Pattern,
TemplateArgs);
}
}
}
}
/// \brief Instantiate the definitions of all of the members of the
/// given class template specialization, which was named as part of an
/// explicit instantiation.
void
Sema::InstantiateClassTemplateSpecializationMembers(
SourceLocation PointOfInstantiation,
ClassTemplateSpecializationDecl *ClassTemplateSpec,
TemplateSpecializationKind TSK) {
// C++0x [temp.explicit]p7:
// An explicit instantiation that names a class template
// specialization is an explicit instantion of the same kind
// (declaration or definition) of each of its members (not
// including members inherited from base classes) that has not
// been previously explicitly specialized in the translation unit
// containing the explicit instantiation, except as described
// below.
InstantiateClassMembers(PointOfInstantiation, ClassTemplateSpec,
getTemplateInstantiationArgs(ClassTemplateSpec),
TSK);
}
StmtResult
Sema::SubstStmt(Stmt *S, const MultiLevelTemplateArgumentList &TemplateArgs) {
if (!S)
return S;
TemplateInstantiator Instantiator(*this, TemplateArgs,
SourceLocation(),
DeclarationName());
return Instantiator.TransformStmt(S);
}
ExprResult
Sema::SubstExpr(Expr *E, const MultiLevelTemplateArgumentList &TemplateArgs) {
if (!E)
return E;
TemplateInstantiator Instantiator(*this, TemplateArgs,
SourceLocation(),
DeclarationName());
return Instantiator.TransformExpr(E);
}
ExprResult Sema::SubstInitializer(Expr *Init,
const MultiLevelTemplateArgumentList &TemplateArgs,
bool CXXDirectInit) {
TemplateInstantiator Instantiator(*this, TemplateArgs,
SourceLocation(),
DeclarationName());
return Instantiator.TransformInitializer(Init, CXXDirectInit);
}
bool Sema::SubstExprs(Expr **Exprs, unsigned NumExprs, bool IsCall,
const MultiLevelTemplateArgumentList &TemplateArgs,
SmallVectorImpl<Expr *> &Outputs) {
if (NumExprs == 0)
return false;
TemplateInstantiator Instantiator(*this, TemplateArgs,
SourceLocation(),
DeclarationName());
return Instantiator.TransformExprs(Exprs, NumExprs, IsCall, Outputs);
}
NestedNameSpecifierLoc
Sema::SubstNestedNameSpecifierLoc(NestedNameSpecifierLoc NNS,
const MultiLevelTemplateArgumentList &TemplateArgs) {
if (!NNS)
return NestedNameSpecifierLoc();
TemplateInstantiator Instantiator(*this, TemplateArgs, NNS.getBeginLoc(),
DeclarationName());
return Instantiator.TransformNestedNameSpecifierLoc(NNS);
}
/// \brief Do template substitution on declaration name info.
DeclarationNameInfo
Sema::SubstDeclarationNameInfo(const DeclarationNameInfo &NameInfo,
const MultiLevelTemplateArgumentList &TemplateArgs) {
TemplateInstantiator Instantiator(*this, TemplateArgs, NameInfo.getLoc(),
NameInfo.getName());
return Instantiator.TransformDeclarationNameInfo(NameInfo);
}
TemplateName
Sema::SubstTemplateName(NestedNameSpecifierLoc QualifierLoc,
TemplateName Name, SourceLocation Loc,
const MultiLevelTemplateArgumentList &TemplateArgs) {
TemplateInstantiator Instantiator(*this, TemplateArgs, Loc,
DeclarationName());
CXXScopeSpec SS;
SS.Adopt(QualifierLoc);
return Instantiator.TransformTemplateName(SS, Name, Loc);
}
bool Sema::Subst(const TemplateArgumentLoc *Args, unsigned NumArgs,
TemplateArgumentListInfo &Result,
const MultiLevelTemplateArgumentList &TemplateArgs) {
TemplateInstantiator Instantiator(*this, TemplateArgs, SourceLocation(),
DeclarationName());
return Instantiator.TransformTemplateArguments(Args, NumArgs, Result);
}
static const Decl *getCanonicalParmVarDecl(const Decl *D) {
// When storing ParmVarDecls in the local instantiation scope, we always
// want to use the ParmVarDecl from the canonical function declaration,
// since the map is then valid for any redeclaration or definition of that
// function.
if (const ParmVarDecl *PV = dyn_cast<ParmVarDecl>(D)) {
if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(PV->getDeclContext())) {
unsigned i = PV->getFunctionScopeIndex();
// This parameter might be from a freestanding function type within the
// function and isn't necessarily referring to one of FD's parameters.
if (FD->getParamDecl(i) == PV)
return FD->getCanonicalDecl()->getParamDecl(i);
}
}
return D;
}
llvm::PointerUnion<Decl *, LocalInstantiationScope::DeclArgumentPack *> *
LocalInstantiationScope::findInstantiationOf(const Decl *D) {
D = getCanonicalParmVarDecl(D);
for (LocalInstantiationScope *Current = this; Current;
Current = Current->Outer) {
// Check if we found something within this scope.
const Decl *CheckD = D;
do {
LocalDeclsMap::iterator Found = Current->LocalDecls.find(CheckD);
if (Found != Current->LocalDecls.end())
return &Found->second;
// If this is a tag declaration, it's possible that we need to look for
// a previous declaration.
if (const TagDecl *Tag = dyn_cast<TagDecl>(CheckD))
CheckD = Tag->getPreviousDecl();
else
CheckD = nullptr;
} while (CheckD);
// If we aren't combined with our outer scope, we're done.
if (!Current->CombineWithOuterScope)
break;
}
// If we're performing a partial substitution during template argument
// deduction, we may not have values for template parameters yet.
if (isa<NonTypeTemplateParmDecl>(D) || isa<TemplateTypeParmDecl>(D) ||
isa<TemplateTemplateParmDecl>(D))
return nullptr;
// If we didn't find the decl, then we either have a sema bug, or we have a
// forward reference to a label declaration. Return null to indicate that
// we have an uninstantiated label.
assert(isa<LabelDecl>(D) && "declaration not instantiated in this scope");
return nullptr;
}
void LocalInstantiationScope::InstantiatedLocal(const Decl *D, Decl *Inst) {
D = getCanonicalParmVarDecl(D);
llvm::PointerUnion<Decl *, DeclArgumentPack *> &Stored = LocalDecls[D];
if (Stored.isNull()) {
#ifndef NDEBUG
// It should not be present in any surrounding scope either.
LocalInstantiationScope *Current = this;
while (Current->CombineWithOuterScope && Current->Outer) {
Current = Current->Outer;
assert(Current->LocalDecls.find(D) == Current->LocalDecls.end() &&
"Instantiated local in inner and outer scopes");
}
#endif
Stored = Inst;
} else if (DeclArgumentPack *Pack = Stored.dyn_cast<DeclArgumentPack *>()) {
Pack->push_back(Inst);
} else {
assert(Stored.get<Decl *>() == Inst && "Already instantiated this local");
}
}
void LocalInstantiationScope::InstantiatedLocalPackArg(const Decl *D,
Decl *Inst) {
D = getCanonicalParmVarDecl(D);
DeclArgumentPack *Pack = LocalDecls[D].get<DeclArgumentPack *>();
Pack->push_back(Inst);
}
void LocalInstantiationScope::MakeInstantiatedLocalArgPack(const Decl *D) {
#ifndef NDEBUG
// This should be the first time we've been told about this decl.
for (LocalInstantiationScope *Current = this;
Current && Current->CombineWithOuterScope; Current = Current->Outer)
assert(Current->LocalDecls.find(D) == Current->LocalDecls.end() &&
"Creating local pack after instantiation of local");
#endif
D = getCanonicalParmVarDecl(D);
llvm::PointerUnion<Decl *, DeclArgumentPack *> &Stored = LocalDecls[D];
DeclArgumentPack *Pack = new DeclArgumentPack;
Stored = Pack;
ArgumentPacks.push_back(Pack);
}
void LocalInstantiationScope::SetPartiallySubstitutedPack(NamedDecl *Pack,
const TemplateArgument *ExplicitArgs,
unsigned NumExplicitArgs) {
assert((!PartiallySubstitutedPack || PartiallySubstitutedPack == Pack) &&
"Already have a partially-substituted pack");
assert((!PartiallySubstitutedPack
|| NumArgsInPartiallySubstitutedPack == NumExplicitArgs) &&
"Wrong number of arguments in partially-substituted pack");
PartiallySubstitutedPack = Pack;
ArgsInPartiallySubstitutedPack = ExplicitArgs;
NumArgsInPartiallySubstitutedPack = NumExplicitArgs;
}
NamedDecl *LocalInstantiationScope::getPartiallySubstitutedPack(
const TemplateArgument **ExplicitArgs,
unsigned *NumExplicitArgs) const {
if (ExplicitArgs)
*ExplicitArgs = nullptr;
if (NumExplicitArgs)
*NumExplicitArgs = 0;
for (const LocalInstantiationScope *Current = this; Current;
Current = Current->Outer) {
if (Current->PartiallySubstitutedPack) {
if (ExplicitArgs)
*ExplicitArgs = Current->ArgsInPartiallySubstitutedPack;
if (NumExplicitArgs)
*NumExplicitArgs = Current->NumArgsInPartiallySubstitutedPack;
return Current->PartiallySubstitutedPack;
}
if (!Current->CombineWithOuterScope)
break;
}
return nullptr;
}
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