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//===------ CXXInheritance.cpp - C++ Inheritance ----------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file provides routines that help analyzing C++ inheritance hierarchies.
//
//===----------------------------------------------------------------------===//
#include "clang/AST/CXXInheritance.h"
#include "clang/AST/RecordLayout.h"
#include "clang/AST/DeclCXX.h"
#include <algorithm>
#include <set>
using namespace clang;
/// \brief Computes the set of declarations referenced by these base
/// paths.
void CXXBasePaths::ComputeDeclsFound() {
assert(NumDeclsFound == 0 && !DeclsFound &&
"Already computed the set of declarations");
SmallVector<NamedDecl *, 8> Decls;
for (paths_iterator Path = begin(), PathEnd = end(); Path != PathEnd; ++Path)
Decls.push_back(*Path->Decls.first);
// Eliminate duplicated decls.
llvm::array_pod_sort(Decls.begin(), Decls.end());
Decls.erase(std::unique(Decls.begin(), Decls.end()), Decls.end());
NumDeclsFound = Decls.size();
DeclsFound = new NamedDecl * [NumDeclsFound];
std::copy(Decls.begin(), Decls.end(), DeclsFound);
}
CXXBasePaths::decl_iterator CXXBasePaths::found_decls_begin() {
if (NumDeclsFound == 0)
ComputeDeclsFound();
return DeclsFound;
}
CXXBasePaths::decl_iterator CXXBasePaths::found_decls_end() {
if (NumDeclsFound == 0)
ComputeDeclsFound();
return DeclsFound + NumDeclsFound;
}
/// isAmbiguous - Determines whether the set of paths provided is
/// ambiguous, i.e., there are two or more paths that refer to
/// different base class subobjects of the same type. BaseType must be
/// an unqualified, canonical class type.
bool CXXBasePaths::isAmbiguous(CanQualType BaseType) {
BaseType = BaseType.getUnqualifiedType();
std::pair<bool, unsigned>& Subobjects = ClassSubobjects[BaseType];
return Subobjects.second + (Subobjects.first? 1 : 0) > 1;
}
/// clear - Clear out all prior path information.
void CXXBasePaths::clear() {
Paths.clear();
ClassSubobjects.clear();
ScratchPath.clear();
DetectedVirtual = 0;
}
/// @brief Swaps the contents of this CXXBasePaths structure with the
/// contents of Other.
void CXXBasePaths::swap(CXXBasePaths &Other) {
std::swap(Origin, Other.Origin);
Paths.swap(Other.Paths);
ClassSubobjects.swap(Other.ClassSubobjects);
std::swap(FindAmbiguities, Other.FindAmbiguities);
std::swap(RecordPaths, Other.RecordPaths);
std::swap(DetectVirtual, Other.DetectVirtual);
std::swap(DetectedVirtual, Other.DetectedVirtual);
}
bool CXXRecordDecl::isDerivedFrom(const CXXRecordDecl *Base) const {
CXXBasePaths Paths(/*FindAmbiguities=*/false, /*RecordPaths=*/false,
/*DetectVirtual=*/false);
return isDerivedFrom(Base, Paths);
}
bool CXXRecordDecl::isDerivedFrom(const CXXRecordDecl *Base,
CXXBasePaths &Paths) const {
if (getCanonicalDecl() == Base->getCanonicalDecl())
return false;
Paths.setOrigin(const_cast<CXXRecordDecl*>(this));
return lookupInBases(&FindBaseClass,
const_cast<CXXRecordDecl*>(Base->getCanonicalDecl()),
Paths);
}
bool CXXRecordDecl::isVirtuallyDerivedFrom(CXXRecordDecl *Base) const {
if (!getNumVBases())
return false;
CXXBasePaths Paths(/*FindAmbiguities=*/false, /*RecordPaths=*/false,
/*DetectVirtual=*/false);
if (getCanonicalDecl() == Base->getCanonicalDecl())
return false;
Paths.setOrigin(const_cast<CXXRecordDecl*>(this));
return lookupInBases(&FindVirtualBaseClass, Base->getCanonicalDecl(), Paths);
}
static bool BaseIsNot(const CXXRecordDecl *Base, void *OpaqueTarget) {
// OpaqueTarget is a CXXRecordDecl*.
return Base->getCanonicalDecl() != (const CXXRecordDecl*) OpaqueTarget;
}
bool CXXRecordDecl::isProvablyNotDerivedFrom(const CXXRecordDecl *Base) const {
return forallBases(BaseIsNot, (void*) Base->getCanonicalDecl());
}
bool CXXRecordDecl::forallBases(ForallBasesCallback *BaseMatches,
void *OpaqueData,
bool AllowShortCircuit) const {
SmallVector<const CXXRecordDecl*, 8> Queue;
const CXXRecordDecl *Record = this;
bool AllMatches = true;
while (true) {
for (CXXRecordDecl::base_class_const_iterator
I = Record->bases_begin(), E = Record->bases_end(); I != E; ++I) {
const RecordType *Ty = I->getType()->getAs<RecordType>();
if (!Ty) {
if (AllowShortCircuit) return false;
AllMatches = false;
continue;
}
CXXRecordDecl *Base =
cast_or_null<CXXRecordDecl>(Ty->getDecl()->getDefinition());
if (!Base) {
if (AllowShortCircuit) return false;
AllMatches = false;
continue;
}
Queue.push_back(Base);
if (!BaseMatches(Base, OpaqueData)) {
if (AllowShortCircuit) return false;
AllMatches = false;
continue;
}
}
if (Queue.empty()) break;
Record = Queue.back(); // not actually a queue.
Queue.pop_back();
}
return AllMatches;
}
bool CXXBasePaths::lookupInBases(ASTContext &Context,
const CXXRecordDecl *Record,
CXXRecordDecl::BaseMatchesCallback *BaseMatches,
void *UserData) {
bool FoundPath = false;
// The access of the path down to this record.
AccessSpecifier AccessToHere = ScratchPath.Access;
bool IsFirstStep = ScratchPath.empty();
for (CXXRecordDecl::base_class_const_iterator BaseSpec = Record->bases_begin(),
BaseSpecEnd = Record->bases_end();
BaseSpec != BaseSpecEnd;
++BaseSpec) {
// Find the record of the base class subobjects for this type.
QualType BaseType = Context.getCanonicalType(BaseSpec->getType())
.getUnqualifiedType();
// C++ [temp.dep]p3:
// In the definition of a class template or a member of a class template,
// if a base class of the class template depends on a template-parameter,
// the base class scope is not examined during unqualified name lookup
// either at the point of definition of the class template or member or
// during an instantiation of the class tem- plate or member.
if (BaseType->isDependentType())
continue;
// Determine whether we need to visit this base class at all,
// updating the count of subobjects appropriately.
std::pair<bool, unsigned>& Subobjects = ClassSubobjects[BaseType];
bool VisitBase = true;
bool SetVirtual = false;
if (BaseSpec->isVirtual()) {
VisitBase = !Subobjects.first;
Subobjects.first = true;
if (isDetectingVirtual() && DetectedVirtual == 0) {
// If this is the first virtual we find, remember it. If it turns out
// there is no base path here, we'll reset it later.
DetectedVirtual = BaseType->getAs<RecordType>();
SetVirtual = true;
}
} else
++Subobjects.second;
if (isRecordingPaths()) {
// Add this base specifier to the current path.
CXXBasePathElement Element;
Element.Base = &*BaseSpec;
Element.Class = Record;
if (BaseSpec->isVirtual())
Element.SubobjectNumber = 0;
else
Element.SubobjectNumber = Subobjects.second;
ScratchPath.push_back(Element);
// Calculate the "top-down" access to this base class.
// The spec actually describes this bottom-up, but top-down is
// equivalent because the definition works out as follows:
// 1. Write down the access along each step in the inheritance
// chain, followed by the access of the decl itself.
// For example, in
// class A { public: int foo; };
// class B : protected A {};
// class C : public B {};
// class D : private C {};
// we would write:
// private public protected public
// 2. If 'private' appears anywhere except far-left, access is denied.
// 3. Otherwise, overall access is determined by the most restrictive
// access in the sequence.
if (IsFirstStep)
ScratchPath.Access = BaseSpec->getAccessSpecifier();
else
ScratchPath.Access = CXXRecordDecl::MergeAccess(AccessToHere,
BaseSpec->getAccessSpecifier());
}
// Track whether there's a path involving this specific base.
bool FoundPathThroughBase = false;
if (BaseMatches(BaseSpec, ScratchPath, UserData)) {
// We've found a path that terminates at this base.
FoundPath = FoundPathThroughBase = true;
if (isRecordingPaths()) {
// We have a path. Make a copy of it before moving on.
Paths.push_back(ScratchPath);
} else if (!isFindingAmbiguities()) {
// We found a path and we don't care about ambiguities;
// return immediately.
return FoundPath;
}
} else if (VisitBase) {
CXXRecordDecl *BaseRecord
= cast<CXXRecordDecl>(BaseSpec->getType()->getAs<RecordType>()
->getDecl());
if (lookupInBases(Context, BaseRecord, BaseMatches, UserData)) {
// C++ [class.member.lookup]p2:
// A member name f in one sub-object B hides a member name f in
// a sub-object A if A is a base class sub-object of B. Any
// declarations that are so hidden are eliminated from
// consideration.
// There is a path to a base class that meets the criteria. If we're
// not collecting paths or finding ambiguities, we're done.
FoundPath = FoundPathThroughBase = true;
if (!isFindingAmbiguities())
return FoundPath;
}
}
// Pop this base specifier off the current path (if we're
// collecting paths).
if (isRecordingPaths()) {
ScratchPath.pop_back();
}
// If we set a virtual earlier, and this isn't a path, forget it again.
if (SetVirtual && !FoundPathThroughBase) {
DetectedVirtual = 0;
}
}
// Reset the scratch path access.
ScratchPath.Access = AccessToHere;
return FoundPath;
}
bool CXXRecordDecl::lookupInBases(BaseMatchesCallback *BaseMatches,
void *UserData,
CXXBasePaths &Paths) const {
// If we didn't find anything, report that.
if (!Paths.lookupInBases(getASTContext(), this, BaseMatches, UserData))
return false;
// If we're not recording paths or we won't ever find ambiguities,
// we're done.
if (!Paths.isRecordingPaths() || !Paths.isFindingAmbiguities())
return true;
// C++ [class.member.lookup]p6:
// When virtual base classes are used, a hidden declaration can be
// reached along a path through the sub-object lattice that does
// not pass through the hiding declaration. This is not an
// ambiguity. The identical use with nonvirtual base classes is an
// ambiguity; in that case there is no unique instance of the name
// that hides all the others.
//
// FIXME: This is an O(N^2) algorithm, but DPG doesn't see an easy
// way to make it any faster.
for (CXXBasePaths::paths_iterator P = Paths.begin(), PEnd = Paths.end();
P != PEnd; /* increment in loop */) {
bool Hidden = false;
for (CXXBasePath::iterator PE = P->begin(), PEEnd = P->end();
PE != PEEnd && !Hidden; ++PE) {
if (PE->Base->isVirtual()) {
CXXRecordDecl *VBase = 0;
if (const RecordType *Record = PE->Base->getType()->getAs<RecordType>())
VBase = cast<CXXRecordDecl>(Record->getDecl());
if (!VBase)
break;
// The declaration(s) we found along this path were found in a
// subobject of a virtual base. Check whether this virtual
// base is a subobject of any other path; if so, then the
// declaration in this path are hidden by that patch.
for (CXXBasePaths::paths_iterator HidingP = Paths.begin(),
HidingPEnd = Paths.end();
HidingP != HidingPEnd;
++HidingP) {
CXXRecordDecl *HidingClass = 0;
if (const RecordType *Record
= HidingP->back().Base->getType()->getAs<RecordType>())
HidingClass = cast<CXXRecordDecl>(Record->getDecl());
if (!HidingClass)
break;
if (HidingClass->isVirtuallyDerivedFrom(VBase)) {
Hidden = true;
break;
}
}
}
}
if (Hidden)
P = Paths.Paths.erase(P);
else
++P;
}
return true;
}
bool CXXRecordDecl::FindBaseClass(const CXXBaseSpecifier *Specifier,
CXXBasePath &Path,
void *BaseRecord) {
assert(((Decl *)BaseRecord)->getCanonicalDecl() == BaseRecord &&
"User data for FindBaseClass is not canonical!");
return Specifier->getType()->getAs<RecordType>()->getDecl()
->getCanonicalDecl() == BaseRecord;
}
bool CXXRecordDecl::FindVirtualBaseClass(const CXXBaseSpecifier *Specifier,
CXXBasePath &Path,
void *BaseRecord) {
assert(((Decl *)BaseRecord)->getCanonicalDecl() == BaseRecord &&
"User data for FindBaseClass is not canonical!");
return Specifier->isVirtual() &&
Specifier->getType()->getAs<RecordType>()->getDecl()
->getCanonicalDecl() == BaseRecord;
}
bool CXXRecordDecl::FindTagMember(const CXXBaseSpecifier *Specifier,
CXXBasePath &Path,
void *Name) {
RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl();
DeclarationName N = DeclarationName::getFromOpaquePtr(Name);
for (Path.Decls = BaseRecord->lookup(N);
Path.Decls.first != Path.Decls.second;
++Path.Decls.first) {
if ((*Path.Decls.first)->isInIdentifierNamespace(IDNS_Tag))
return true;
}
return false;
}
bool CXXRecordDecl::FindOrdinaryMember(const CXXBaseSpecifier *Specifier,
CXXBasePath &Path,
void *Name) {
RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl();
const unsigned IDNS = IDNS_Ordinary | IDNS_Tag | IDNS_Member;
DeclarationName N = DeclarationName::getFromOpaquePtr(Name);
for (Path.Decls = BaseRecord->lookup(N);
Path.Decls.first != Path.Decls.second;
++Path.Decls.first) {
if ((*Path.Decls.first)->isInIdentifierNamespace(IDNS))
return true;
}
return false;
}
bool CXXRecordDecl::
FindNestedNameSpecifierMember(const CXXBaseSpecifier *Specifier,
CXXBasePath &Path,
void *Name) {
RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl();
DeclarationName N = DeclarationName::getFromOpaquePtr(Name);
for (Path.Decls = BaseRecord->lookup(N);
Path.Decls.first != Path.Decls.second;
++Path.Decls.first) {
// FIXME: Refactor the "is it a nested-name-specifier?" check
if (isa<TypedefNameDecl>(*Path.Decls.first) ||
(*Path.Decls.first)->isInIdentifierNamespace(IDNS_Tag))
return true;
}
return false;
}
void OverridingMethods::add(unsigned OverriddenSubobject,
UniqueVirtualMethod Overriding) {
SmallVector<UniqueVirtualMethod, 4> &SubobjectOverrides
= Overrides[OverriddenSubobject];
if (std::find(SubobjectOverrides.begin(), SubobjectOverrides.end(),
Overriding) == SubobjectOverrides.end())
SubobjectOverrides.push_back(Overriding);
}
void OverridingMethods::add(const OverridingMethods &Other) {
for (const_iterator I = Other.begin(), IE = Other.end(); I != IE; ++I) {
for (overriding_const_iterator M = I->second.begin(),
MEnd = I->second.end();
M != MEnd;
++M)
add(I->first, *M);
}
}
void OverridingMethods::replaceAll(UniqueVirtualMethod Overriding) {
for (iterator I = begin(), IEnd = end(); I != IEnd; ++I) {
I->second.clear();
I->second.push_back(Overriding);
}
}
namespace {
class FinalOverriderCollector {
/// \brief The number of subobjects of a given class type that
/// occur within the class hierarchy.
llvm::DenseMap<const CXXRecordDecl *, unsigned> SubobjectCount;
/// \brief Overriders for each virtual base subobject.
llvm::DenseMap<const CXXRecordDecl *, CXXFinalOverriderMap *> VirtualOverriders;
CXXFinalOverriderMap FinalOverriders;
public:
~FinalOverriderCollector();
void Collect(const CXXRecordDecl *RD, bool VirtualBase,
const CXXRecordDecl *InVirtualSubobject,
CXXFinalOverriderMap &Overriders);
};
}
void FinalOverriderCollector::Collect(const CXXRecordDecl *RD,
bool VirtualBase,
const CXXRecordDecl *InVirtualSubobject,
CXXFinalOverriderMap &Overriders) {
unsigned SubobjectNumber = 0;
if (!VirtualBase)
SubobjectNumber
= ++SubobjectCount[cast<CXXRecordDecl>(RD->getCanonicalDecl())];
for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(),
BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) {
if (const RecordType *RT = Base->getType()->getAs<RecordType>()) {
const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl());
if (!BaseDecl->isPolymorphic())
continue;
if (Overriders.empty() && !Base->isVirtual()) {
// There are no other overriders of virtual member functions,
// so let the base class fill in our overriders for us.
Collect(BaseDecl, false, InVirtualSubobject, Overriders);
continue;
}
// Collect all of the overridders from the base class subobject
// and merge them into the set of overridders for this class.
// For virtual base classes, populate or use the cached virtual
// overrides so that we do not walk the virtual base class (and
// its base classes) more than once.
CXXFinalOverriderMap ComputedBaseOverriders;
CXXFinalOverriderMap *BaseOverriders = &ComputedBaseOverriders;
if (Base->isVirtual()) {
CXXFinalOverriderMap *&MyVirtualOverriders = VirtualOverriders[BaseDecl];
if (!MyVirtualOverriders) {
MyVirtualOverriders = new CXXFinalOverriderMap;
Collect(BaseDecl, true, BaseDecl, *MyVirtualOverriders);
}
BaseOverriders = MyVirtualOverriders;
} else
Collect(BaseDecl, false, InVirtualSubobject, ComputedBaseOverriders);
// Merge the overriders from this base class into our own set of
// overriders.
for (CXXFinalOverriderMap::iterator OM = BaseOverriders->begin(),
OMEnd = BaseOverriders->end();
OM != OMEnd;
++OM) {
const CXXMethodDecl *CanonOM
= cast<CXXMethodDecl>(OM->first->getCanonicalDecl());
Overriders[CanonOM].add(OM->second);
}
}
}
for (CXXRecordDecl::method_iterator M = RD->method_begin(),
MEnd = RD->method_end();
M != MEnd;
++M) {
// We only care about virtual methods.
if (!M->isVirtual())
continue;
CXXMethodDecl *CanonM = cast<CXXMethodDecl>(M->getCanonicalDecl());
if (CanonM->begin_overridden_methods()
== CanonM->end_overridden_methods()) {
// This is a new virtual function that does not override any
// other virtual function. Add it to the map of virtual
// functions for which we are tracking overridders.
// C++ [class.virtual]p2:
// For convenience we say that any virtual function overrides itself.
Overriders[CanonM].add(SubobjectNumber,
UniqueVirtualMethod(CanonM, SubobjectNumber,
InVirtualSubobject));
continue;
}
// This virtual method overrides other virtual methods, so it does
// not add any new slots into the set of overriders. Instead, we
// replace entries in the set of overriders with the new
// overrider. To do so, we dig down to the original virtual
// functions using data recursion and update all of the methods it
// overrides.
typedef std::pair<CXXMethodDecl::method_iterator,
CXXMethodDecl::method_iterator> OverriddenMethods;
SmallVector<OverriddenMethods, 4> Stack;
Stack.push_back(std::make_pair(CanonM->begin_overridden_methods(),
CanonM->end_overridden_methods()));
while (!Stack.empty()) {
OverriddenMethods OverMethods = Stack.back();
Stack.pop_back();
for (; OverMethods.first != OverMethods.second; ++OverMethods.first) {
const CXXMethodDecl *CanonOM
= cast<CXXMethodDecl>((*OverMethods.first)->getCanonicalDecl());
// C++ [class.virtual]p2:
// A virtual member function C::vf of a class object S is
// a final overrider unless the most derived class (1.8)
// of which S is a base class subobject (if any) declares
// or inherits another member function that overrides vf.
//
// Treating this object like the most derived class, we
// replace any overrides from base classes with this
// overriding virtual function.
Overriders[CanonOM].replaceAll(
UniqueVirtualMethod(CanonM, SubobjectNumber,
InVirtualSubobject));
if (CanonOM->begin_overridden_methods()
== CanonOM->end_overridden_methods())
continue;
// Continue recursion to the methods that this virtual method
// overrides.
Stack.push_back(std::make_pair(CanonOM->begin_overridden_methods(),
CanonOM->end_overridden_methods()));
}
}
// C++ [class.virtual]p2:
// For convenience we say that any virtual function overrides itself.
Overriders[CanonM].add(SubobjectNumber,
UniqueVirtualMethod(CanonM, SubobjectNumber,
InVirtualSubobject));
}
}
FinalOverriderCollector::~FinalOverriderCollector() {
for (llvm::DenseMap<const CXXRecordDecl *, CXXFinalOverriderMap *>::iterator
VO = VirtualOverriders.begin(), VOEnd = VirtualOverriders.end();
VO != VOEnd;
++VO)
delete VO->second;
}
void
CXXRecordDecl::getFinalOverriders(CXXFinalOverriderMap &FinalOverriders) const {
FinalOverriderCollector Collector;
Collector.Collect(this, false, 0, FinalOverriders);
// Weed out any final overriders that come from virtual base class
// subobjects that were hidden by other subobjects along any path.
// This is the final-overrider variant of C++ [class.member.lookup]p10.
for (CXXFinalOverriderMap::iterator OM = FinalOverriders.begin(),
OMEnd = FinalOverriders.end();
OM != OMEnd;
++OM) {
for (OverridingMethods::iterator SO = OM->second.begin(),
SOEnd = OM->second.end();
SO != SOEnd;
++SO) {
SmallVector<UniqueVirtualMethod, 4> &Overriding = SO->second;
if (Overriding.size() < 2)
continue;
for (SmallVector<UniqueVirtualMethod, 4>::iterator
Pos = Overriding.begin(), PosEnd = Overriding.end();
Pos != PosEnd;
/* increment in loop */) {
if (!Pos->InVirtualSubobject) {
++Pos;
continue;
}
// We have an overriding method in a virtual base class
// subobject (or non-virtual base class subobject thereof);
// determine whether there exists an other overriding method
// in a base class subobject that hides the virtual base class
// subobject.
bool Hidden = false;
for (SmallVector<UniqueVirtualMethod, 4>::iterator
OP = Overriding.begin(), OPEnd = Overriding.end();
OP != OPEnd && !Hidden;
++OP) {
if (Pos == OP)
continue;
if (OP->Method->getParent()->isVirtuallyDerivedFrom(
const_cast<CXXRecordDecl *>(Pos->InVirtualSubobject)))
Hidden = true;
}
if (Hidden) {
// The current overriding function is hidden by another
// overriding function; remove this one.
Pos = Overriding.erase(Pos);
PosEnd = Overriding.end();
} else {
++Pos;
}
}
}
}
}
static void
AddIndirectPrimaryBases(const CXXRecordDecl *RD, ASTContext &Context,
CXXIndirectPrimaryBaseSet& Bases) {
// If the record has a virtual primary base class, add it to our set.
const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD);
if (Layout.isPrimaryBaseVirtual())
Bases.insert(Layout.getPrimaryBase());
for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(),
E = RD->bases_end(); I != E; ++I) {
assert(!I->getType()->isDependentType() &&
"Cannot get indirect primary bases for class with dependent bases.");
const CXXRecordDecl *BaseDecl =
cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl());
// Only bases with virtual bases participate in computing the
// indirect primary virtual base classes.
if (BaseDecl->getNumVBases())
AddIndirectPrimaryBases(BaseDecl, Context, Bases);
}
}
void
CXXRecordDecl::getIndirectPrimaryBases(CXXIndirectPrimaryBaseSet& Bases) const {
ASTContext &Context = getASTContext();
if (!getNumVBases())
return;
for (CXXRecordDecl::base_class_const_iterator I = bases_begin(),
E = bases_end(); I != E; ++I) {
assert(!I->getType()->isDependentType() &&
"Cannot get indirect primary bases for class with dependent bases.");
const CXXRecordDecl *BaseDecl =
cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl());
// Only bases with virtual bases participate in computing the
// indirect primary virtual base classes.
if (BaseDecl->getNumVBases())
AddIndirectPrimaryBases(BaseDecl, Context, Bases);
}
}