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

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//===--- APValue.cpp - Union class for APFloat/APSInt/Complex -------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements the APValue class.
//
//===----------------------------------------------------------------------===//
#include "clang/AST/APValue.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/CharUnits.h"
#include "clang/AST/DeclCXX.h"
#include "clang/AST/Expr.h"
#include "clang/AST/Type.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
using namespace clang;
/// The identity of a type_info object depends on the canonical unqualified
/// type only.
TypeInfoLValue::TypeInfoLValue(const Type *T)
: T(T->getCanonicalTypeUnqualified().getTypePtr()) {}
void TypeInfoLValue::print(llvm::raw_ostream &Out,
const PrintingPolicy &Policy) const {
Out << "typeid(";
QualType(getType(), 0).print(Out, Policy);
Out << ")";
}
static_assert(
1 << llvm::PointerLikeTypeTraits<TypeInfoLValue>::NumLowBitsAvailable <=
alignof(Type),
"Type is insufficiently aligned");
APValue::LValueBase::LValueBase(const ValueDecl *P, unsigned I, unsigned V)
: Ptr(P), Local{I, V} {}
APValue::LValueBase::LValueBase(const Expr *P, unsigned I, unsigned V)
: Ptr(P), Local{I, V} {}
APValue::LValueBase APValue::LValueBase::getDynamicAlloc(DynamicAllocLValue LV,
QualType Type) {
LValueBase Base;
Base.Ptr = LV;
Base.DynamicAllocType = Type.getAsOpaquePtr();
return Base;
}
APValue::LValueBase APValue::LValueBase::getTypeInfo(TypeInfoLValue LV,
QualType TypeInfo) {
LValueBase Base;
Base.Ptr = LV;
Base.TypeInfoType = TypeInfo.getAsOpaquePtr();
return Base;
}
unsigned APValue::LValueBase::getCallIndex() const {
return (is<TypeInfoLValue>() || is<DynamicAllocLValue>()) ? 0
: Local.CallIndex;
}
unsigned APValue::LValueBase::getVersion() const {
return (is<TypeInfoLValue>() || is<DynamicAllocLValue>()) ? 0 : Local.Version;
}
QualType APValue::LValueBase::getTypeInfoType() const {
assert(is<TypeInfoLValue>() && "not a type_info lvalue");
return QualType::getFromOpaquePtr(TypeInfoType);
}
QualType APValue::LValueBase::getDynamicAllocType() const {
assert(is<DynamicAllocLValue>() && "not a dynamic allocation lvalue");
return QualType::getFromOpaquePtr(DynamicAllocType);
}
namespace clang {
bool operator==(const APValue::LValueBase &LHS,
const APValue::LValueBase &RHS) {
if (LHS.Ptr != RHS.Ptr)
return false;
if (LHS.is<TypeInfoLValue>())
return true;
return LHS.Local.CallIndex == RHS.Local.CallIndex &&
LHS.Local.Version == RHS.Local.Version;
}
}
namespace {
struct LVBase {
APValue::LValueBase Base;
CharUnits Offset;
unsigned PathLength;
bool IsNullPtr : 1;
bool IsOnePastTheEnd : 1;
};
}
void *APValue::LValueBase::getOpaqueValue() const {
return Ptr.getOpaqueValue();
}
bool APValue::LValueBase::isNull() const {
return Ptr.isNull();
}
APValue::LValueBase::operator bool () const {
return static_cast<bool>(Ptr);
}
clang::APValue::LValueBase
llvm::DenseMapInfo<clang::APValue::LValueBase>::getEmptyKey() {
return clang::APValue::LValueBase(
DenseMapInfo<const ValueDecl*>::getEmptyKey());
}
clang::APValue::LValueBase
llvm::DenseMapInfo<clang::APValue::LValueBase>::getTombstoneKey() {
return clang::APValue::LValueBase(
DenseMapInfo<const ValueDecl*>::getTombstoneKey());
}
namespace clang {
llvm::hash_code hash_value(const APValue::LValueBase &Base) {
if (Base.is<TypeInfoLValue>() || Base.is<DynamicAllocLValue>())
return llvm::hash_value(Base.getOpaqueValue());
return llvm::hash_combine(Base.getOpaqueValue(), Base.getCallIndex(),
Base.getVersion());
}
}
unsigned llvm::DenseMapInfo<clang::APValue::LValueBase>::getHashValue(
const clang::APValue::LValueBase &Base) {
return hash_value(Base);
}
bool llvm::DenseMapInfo<clang::APValue::LValueBase>::isEqual(
const clang::APValue::LValueBase &LHS,
const clang::APValue::LValueBase &RHS) {
return LHS == RHS;
}
struct APValue::LV : LVBase {
static const unsigned InlinePathSpace =
(DataSize - sizeof(LVBase)) / sizeof(LValuePathEntry);
/// Path - The sequence of base classes, fields and array indices to follow to
/// walk from Base to the subobject. When performing GCC-style folding, there
/// may not be such a path.
union {
LValuePathEntry Path[InlinePathSpace];
LValuePathEntry *PathPtr;
};
LV() { PathLength = (unsigned)-1; }
~LV() { resizePath(0); }
void resizePath(unsigned Length) {
if (Length == PathLength)
return;
if (hasPathPtr())
delete [] PathPtr;
PathLength = Length;
if (hasPathPtr())
PathPtr = new LValuePathEntry[Length];
}
bool hasPath() const { return PathLength != (unsigned)-1; }
bool hasPathPtr() const { return hasPath() && PathLength > InlinePathSpace; }
LValuePathEntry *getPath() { return hasPathPtr() ? PathPtr : Path; }
const LValuePathEntry *getPath() const {
return hasPathPtr() ? PathPtr : Path;
}
};
namespace {
struct MemberPointerBase {
llvm::PointerIntPair<const ValueDecl*, 1, bool> MemberAndIsDerivedMember;
unsigned PathLength;
};
}
struct APValue::MemberPointerData : MemberPointerBase {
static const unsigned InlinePathSpace =
(DataSize - sizeof(MemberPointerBase)) / sizeof(const CXXRecordDecl*);
typedef const CXXRecordDecl *PathElem;
union {
PathElem Path[InlinePathSpace];
PathElem *PathPtr;
};
MemberPointerData() { PathLength = 0; }
~MemberPointerData() { resizePath(0); }
void resizePath(unsigned Length) {
if (Length == PathLength)
return;
if (hasPathPtr())
delete [] PathPtr;
PathLength = Length;
if (hasPathPtr())
PathPtr = new PathElem[Length];
}
bool hasPathPtr() const { return PathLength > InlinePathSpace; }
PathElem *getPath() { return hasPathPtr() ? PathPtr : Path; }
const PathElem *getPath() const {
return hasPathPtr() ? PathPtr : Path;
}
};
// FIXME: Reduce the malloc traffic here.
APValue::Arr::Arr(unsigned NumElts, unsigned Size) :
Elts(new APValue[NumElts + (NumElts != Size ? 1 : 0)]),
NumElts(NumElts), ArrSize(Size) {}
APValue::Arr::~Arr() { delete [] Elts; }
APValue::StructData::StructData(unsigned NumBases, unsigned NumFields) :
Elts(new APValue[NumBases+NumFields]),
NumBases(NumBases), NumFields(NumFields) {}
APValue::StructData::~StructData() {
delete [] Elts;
}
APValue::UnionData::UnionData() : Field(nullptr), Value(new APValue) {}
APValue::UnionData::~UnionData () {
delete Value;
}
APValue::APValue(const APValue &RHS) : Kind(None) {
switch (RHS.getKind()) {
case None:
case Indeterminate:
Kind = RHS.getKind();
break;
case Int:
MakeInt();
setInt(RHS.getInt());
break;
case Float:
MakeFloat();
setFloat(RHS.getFloat());
break;
case FixedPoint: {
APFixedPoint FXCopy = RHS.getFixedPoint();
MakeFixedPoint(std::move(FXCopy));
break;
}
case Vector:
MakeVector();
setVector(((const Vec *)(const char *)RHS.Data.buffer)->Elts,
RHS.getVectorLength());
break;
case ComplexInt:
MakeComplexInt();
setComplexInt(RHS.getComplexIntReal(), RHS.getComplexIntImag());
break;
case ComplexFloat:
MakeComplexFloat();
setComplexFloat(RHS.getComplexFloatReal(), RHS.getComplexFloatImag());
break;
case LValue:
MakeLValue();
if (RHS.hasLValuePath())
setLValue(RHS.getLValueBase(), RHS.getLValueOffset(), RHS.getLValuePath(),
RHS.isLValueOnePastTheEnd(), RHS.isNullPointer());
else
setLValue(RHS.getLValueBase(), RHS.getLValueOffset(), NoLValuePath(),
RHS.isNullPointer());
break;
case Array:
MakeArray(RHS.getArrayInitializedElts(), RHS.getArraySize());
for (unsigned I = 0, N = RHS.getArrayInitializedElts(); I != N; ++I)
getArrayInitializedElt(I) = RHS.getArrayInitializedElt(I);
if (RHS.hasArrayFiller())
getArrayFiller() = RHS.getArrayFiller();
break;
case Struct:
MakeStruct(RHS.getStructNumBases(), RHS.getStructNumFields());
for (unsigned I = 0, N = RHS.getStructNumBases(); I != N; ++I)
getStructBase(I) = RHS.getStructBase(I);
for (unsigned I = 0, N = RHS.getStructNumFields(); I != N; ++I)
getStructField(I) = RHS.getStructField(I);
break;
case Union:
MakeUnion();
setUnion(RHS.getUnionField(), RHS.getUnionValue());
break;
case MemberPointer:
MakeMemberPointer(RHS.getMemberPointerDecl(),
RHS.isMemberPointerToDerivedMember(),
RHS.getMemberPointerPath());
break;
case AddrLabelDiff:
MakeAddrLabelDiff();
setAddrLabelDiff(RHS.getAddrLabelDiffLHS(), RHS.getAddrLabelDiffRHS());
break;
}
}
void APValue::DestroyDataAndMakeUninit() {
if (Kind == Int)
((APSInt*)(char*)Data.buffer)->~APSInt();
else if (Kind == Float)
((APFloat*)(char*)Data.buffer)->~APFloat();
else if (Kind == FixedPoint)
((APFixedPoint *)(char *)Data.buffer)->~APFixedPoint();
else if (Kind == Vector)
((Vec*)(char*)Data.buffer)->~Vec();
else if (Kind == ComplexInt)
((ComplexAPSInt*)(char*)Data.buffer)->~ComplexAPSInt();
else if (Kind == ComplexFloat)
((ComplexAPFloat*)(char*)Data.buffer)->~ComplexAPFloat();
else if (Kind == LValue)
((LV*)(char*)Data.buffer)->~LV();
else if (Kind == Array)
((Arr*)(char*)Data.buffer)->~Arr();
else if (Kind == Struct)
((StructData*)(char*)Data.buffer)->~StructData();
else if (Kind == Union)
((UnionData*)(char*)Data.buffer)->~UnionData();
else if (Kind == MemberPointer)
((MemberPointerData*)(char*)Data.buffer)->~MemberPointerData();
else if (Kind == AddrLabelDiff)
((AddrLabelDiffData*)(char*)Data.buffer)->~AddrLabelDiffData();
Kind = None;
}
bool APValue::needsCleanup() const {
switch (getKind()) {
case None:
case Indeterminate:
case AddrLabelDiff:
return false;
case Struct:
case Union:
case Array:
case Vector:
return true;
case Int:
return getInt().needsCleanup();
case Float:
return getFloat().needsCleanup();
case FixedPoint:
return getFixedPoint().getValue().needsCleanup();
case ComplexFloat:
assert(getComplexFloatImag().needsCleanup() ==
getComplexFloatReal().needsCleanup() &&
"In _Complex float types, real and imaginary values always have the "
"same size.");
return getComplexFloatReal().needsCleanup();
case ComplexInt:
assert(getComplexIntImag().needsCleanup() ==
getComplexIntReal().needsCleanup() &&
"In _Complex int types, real and imaginary values must have the "
"same size.");
return getComplexIntReal().needsCleanup();
case LValue:
return reinterpret_cast<const LV *>(Data.buffer)->hasPathPtr();
case MemberPointer:
return reinterpret_cast<const MemberPointerData *>(Data.buffer)
->hasPathPtr();
}
llvm_unreachable("Unknown APValue kind!");
}
void APValue::swap(APValue &RHS) {
std::swap(Kind, RHS.Kind);
char TmpData[DataSize];
memcpy(TmpData, Data.buffer, DataSize);
memcpy(Data.buffer, RHS.Data.buffer, DataSize);
memcpy(RHS.Data.buffer, TmpData, DataSize);
}
static double GetApproxValue(const llvm::APFloat &F) {
llvm::APFloat V = F;
bool ignored;
V.convert(llvm::APFloat::IEEEdouble(), llvm::APFloat::rmNearestTiesToEven,
&ignored);
return V.convertToDouble();
}
void APValue::printPretty(raw_ostream &Out, const ASTContext &Ctx,
QualType Ty) const {
// There are no objects of type 'void', but values of this type can be
// returned from functions.
if (Ty->isVoidType()) {
Out << "void()";
return;
}
switch (getKind()) {
case APValue::None:
Out << "<out of lifetime>";
return;
case APValue::Indeterminate:
Out << "<uninitialized>";
return;
case APValue::Int:
if (Ty->isBooleanType())
Out << (getInt().getBoolValue() ? "true" : "false");
else
Out << getInt();
return;
case APValue::Float:
Out << GetApproxValue(getFloat());
return;
case APValue::FixedPoint:
Out << getFixedPoint();
return;
case APValue::Vector: {
Out << '{';
QualType ElemTy = Ty->castAs<VectorType>()->getElementType();
getVectorElt(0).printPretty(Out, Ctx, ElemTy);
for (unsigned i = 1; i != getVectorLength(); ++i) {
Out << ", ";
getVectorElt(i).printPretty(Out, Ctx, ElemTy);
}
Out << '}';
return;
}
case APValue::ComplexInt:
Out << getComplexIntReal() << "+" << getComplexIntImag() << "i";
return;
case APValue::ComplexFloat:
Out << GetApproxValue(getComplexFloatReal()) << "+"
<< GetApproxValue(getComplexFloatImag()) << "i";
return;
case APValue::LValue: {
bool IsReference = Ty->isReferenceType();
QualType InnerTy
= IsReference ? Ty.getNonReferenceType() : Ty->getPointeeType();
if (InnerTy.isNull())
InnerTy = Ty;
LValueBase Base = getLValueBase();
if (!Base) {
if (isNullPointer()) {
Out << (Ctx.getLangOpts().CPlusPlus11 ? "nullptr" : "0");
} else if (IsReference) {
Out << "*(" << InnerTy.stream(Ctx.getPrintingPolicy()) << "*)"
<< getLValueOffset().getQuantity();
} else {
Out << "(" << Ty.stream(Ctx.getPrintingPolicy()) << ")"
<< getLValueOffset().getQuantity();
}
return;
}
if (!hasLValuePath()) {
// No lvalue path: just print the offset.
CharUnits O = getLValueOffset();
CharUnits S = Ctx.getTypeSizeInChars(InnerTy);
if (!O.isZero()) {
if (IsReference)
Out << "*(";
if (O % S) {
Out << "(char*)";
S = CharUnits::One();
}
Out << '&';
} else if (!IsReference) {
Out << '&';
}
if (const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>())
Out << *VD;
else if (TypeInfoLValue TI = Base.dyn_cast<TypeInfoLValue>()) {
TI.print(Out, Ctx.getPrintingPolicy());
} else if (DynamicAllocLValue DA = Base.dyn_cast<DynamicAllocLValue>()) {
Out << "{*new "
<< Base.getDynamicAllocType().stream(Ctx.getPrintingPolicy()) << "#"
<< DA.getIndex() << "}";
} else {
assert(Base.get<const Expr *>() != nullptr &&
"Expecting non-null Expr");
Base.get<const Expr*>()->printPretty(Out, nullptr,
Ctx.getPrintingPolicy());
}
if (!O.isZero()) {
Out << " + " << (O / S);
if (IsReference)
Out << ')';
}
return;
}
// We have an lvalue path. Print it out nicely.
if (!IsReference)
Out << '&';
else if (isLValueOnePastTheEnd())
Out << "*(&";
QualType ElemTy;
if (const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>()) {
Out << *VD;
ElemTy = VD->getType();
} else if (TypeInfoLValue TI = Base.dyn_cast<TypeInfoLValue>()) {
TI.print(Out, Ctx.getPrintingPolicy());
ElemTy = Base.getTypeInfoType();
} else if (DynamicAllocLValue DA = Base.dyn_cast<DynamicAllocLValue>()) {
Out << "{*new "
<< Base.getDynamicAllocType().stream(Ctx.getPrintingPolicy()) << "#"
<< DA.getIndex() << "}";
ElemTy = Base.getDynamicAllocType();
} else {
const Expr *E = Base.get<const Expr*>();
assert(E != nullptr && "Expecting non-null Expr");
E->printPretty(Out, nullptr, Ctx.getPrintingPolicy());
// FIXME: This is wrong if E is a MaterializeTemporaryExpr with an lvalue
// adjustment.
ElemTy = E->getType();
}
ArrayRef<LValuePathEntry> Path = getLValuePath();
const CXXRecordDecl *CastToBase = nullptr;
for (unsigned I = 0, N = Path.size(); I != N; ++I) {
if (ElemTy->getAs<RecordType>()) {
// The lvalue refers to a class type, so the next path entry is a base
// or member.
const Decl *BaseOrMember = Path[I].getAsBaseOrMember().getPointer();
if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(BaseOrMember)) {
CastToBase = RD;
ElemTy = Ctx.getRecordType(RD);
} else {
const ValueDecl *VD = cast<ValueDecl>(BaseOrMember);
Out << ".";
if (CastToBase)
Out << *CastToBase << "::";
Out << *VD;
ElemTy = VD->getType();
}
} else {
// The lvalue must refer to an array.
Out << '[' << Path[I].getAsArrayIndex() << ']';
ElemTy = Ctx.getAsArrayType(ElemTy)->getElementType();
}
}
// Handle formatting of one-past-the-end lvalues.
if (isLValueOnePastTheEnd()) {
// FIXME: If CastToBase is non-0, we should prefix the output with
// "(CastToBase*)".
Out << " + 1";
if (IsReference)
Out << ')';
}
return;
}
case APValue::Array: {
const ArrayType *AT = Ctx.getAsArrayType(Ty);
QualType ElemTy = AT->getElementType();
Out << '{';
if (unsigned N = getArrayInitializedElts()) {
getArrayInitializedElt(0).printPretty(Out, Ctx, ElemTy);
for (unsigned I = 1; I != N; ++I) {
Out << ", ";
if (I == 10) {
// Avoid printing out the entire contents of large arrays.
Out << "...";
break;
}
getArrayInitializedElt(I).printPretty(Out, Ctx, ElemTy);
}
}
Out << '}';
return;
}
case APValue::Struct: {
Out << '{';
const RecordDecl *RD = Ty->castAs<RecordType>()->getDecl();
bool First = true;
if (unsigned N = getStructNumBases()) {
const CXXRecordDecl *CD = cast<CXXRecordDecl>(RD);
CXXRecordDecl::base_class_const_iterator BI = CD->bases_begin();
for (unsigned I = 0; I != N; ++I, ++BI) {
assert(BI != CD->bases_end());
if (!First)
Out << ", ";
getStructBase(I).printPretty(Out, Ctx, BI->getType());
First = false;
}
}
for (const auto *FI : RD->fields()) {
if (!First)
Out << ", ";
if (FI->isUnnamedBitfield()) continue;
getStructField(FI->getFieldIndex()).
printPretty(Out, Ctx, FI->getType());
First = false;
}
Out << '}';
return;
}
case APValue::Union:
Out << '{';
if (const FieldDecl *FD = getUnionField()) {
Out << "." << *FD << " = ";
getUnionValue().printPretty(Out, Ctx, FD->getType());
}
Out << '}';
return;
case APValue::MemberPointer:
// FIXME: This is not enough to unambiguously identify the member in a
// multiple-inheritance scenario.
if (const ValueDecl *VD = getMemberPointerDecl()) {
Out << '&' << *cast<CXXRecordDecl>(VD->getDeclContext()) << "::" << *VD;
return;
}
Out << "0";
return;
case APValue::AddrLabelDiff:
Out << "&&" << getAddrLabelDiffLHS()->getLabel()->getName();
Out << " - ";
Out << "&&" << getAddrLabelDiffRHS()->getLabel()->getName();
return;
}
llvm_unreachable("Unknown APValue kind!");
}
std::string APValue::getAsString(const ASTContext &Ctx, QualType Ty) const {
std::string Result;
llvm::raw_string_ostream Out(Result);
printPretty(Out, Ctx, Ty);
Out.flush();
return Result;
}
bool APValue::toIntegralConstant(APSInt &Result, QualType SrcTy,
const ASTContext &Ctx) const {
if (isInt()) {
Result = getInt();
return true;
}
if (isLValue() && isNullPointer()) {
Result = Ctx.MakeIntValue(Ctx.getTargetNullPointerValue(SrcTy), SrcTy);
return true;
}
if (isLValue() && !getLValueBase()) {
Result = Ctx.MakeIntValue(getLValueOffset().getQuantity(), SrcTy);
return true;
}
return false;
}
const APValue::LValueBase APValue::getLValueBase() const {
assert(isLValue() && "Invalid accessor");
return ((const LV*)(const void*)Data.buffer)->Base;
}
bool APValue::isLValueOnePastTheEnd() const {
assert(isLValue() && "Invalid accessor");
return ((const LV*)(const void*)Data.buffer)->IsOnePastTheEnd;
}
CharUnits &APValue::getLValueOffset() {
assert(isLValue() && "Invalid accessor");
return ((LV*)(void*)Data.buffer)->Offset;
}
bool APValue::hasLValuePath() const {
assert(isLValue() && "Invalid accessor");
return ((const LV*)(const char*)Data.buffer)->hasPath();
}
ArrayRef<APValue::LValuePathEntry> APValue::getLValuePath() const {
assert(isLValue() && hasLValuePath() && "Invalid accessor");
const LV &LVal = *((const LV*)(const char*)Data.buffer);
return llvm::makeArrayRef(LVal.getPath(), LVal.PathLength);
}
unsigned APValue::getLValueCallIndex() const {
assert(isLValue() && "Invalid accessor");
return ((const LV*)(const char*)Data.buffer)->Base.getCallIndex();
}
unsigned APValue::getLValueVersion() const {
assert(isLValue() && "Invalid accessor");
return ((const LV*)(const char*)Data.buffer)->Base.getVersion();
}
bool APValue::isNullPointer() const {
assert(isLValue() && "Invalid usage");
return ((const LV*)(const char*)Data.buffer)->IsNullPtr;
}
void APValue::setLValue(LValueBase B, const CharUnits &O, NoLValuePath,
bool IsNullPtr) {
assert(isLValue() && "Invalid accessor");
LV &LVal = *((LV*)(char*)Data.buffer);
LVal.Base = B;
LVal.IsOnePastTheEnd = false;
LVal.Offset = O;
LVal.resizePath((unsigned)-1);
LVal.IsNullPtr = IsNullPtr;
}
void APValue::setLValue(LValueBase B, const CharUnits &O,
ArrayRef<LValuePathEntry> Path, bool IsOnePastTheEnd,
bool IsNullPtr) {
assert(isLValue() && "Invalid accessor");
LV &LVal = *((LV*)(char*)Data.buffer);
LVal.Base = B;
LVal.IsOnePastTheEnd = IsOnePastTheEnd;
LVal.Offset = O;
LVal.resizePath(Path.size());
memcpy(LVal.getPath(), Path.data(), Path.size() * sizeof(LValuePathEntry));
LVal.IsNullPtr = IsNullPtr;
}
const ValueDecl *APValue::getMemberPointerDecl() const {
assert(isMemberPointer() && "Invalid accessor");
const MemberPointerData &MPD =
*((const MemberPointerData *)(const char *)Data.buffer);
return MPD.MemberAndIsDerivedMember.getPointer();
}
bool APValue::isMemberPointerToDerivedMember() const {
assert(isMemberPointer() && "Invalid accessor");
const MemberPointerData &MPD =
*((const MemberPointerData *)(const char *)Data.buffer);
return MPD.MemberAndIsDerivedMember.getInt();
}
ArrayRef<const CXXRecordDecl*> APValue::getMemberPointerPath() const {
assert(isMemberPointer() && "Invalid accessor");
const MemberPointerData &MPD =
*((const MemberPointerData *)(const char *)Data.buffer);
return llvm::makeArrayRef(MPD.getPath(), MPD.PathLength);
}
void APValue::MakeLValue() {
assert(isAbsent() && "Bad state change");
static_assert(sizeof(LV) <= DataSize, "LV too big");
new ((void*)(char*)Data.buffer) LV();
Kind = LValue;
}
void APValue::MakeArray(unsigned InitElts, unsigned Size) {
assert(isAbsent() && "Bad state change");
new ((void*)(char*)Data.buffer) Arr(InitElts, Size);
Kind = Array;
}
void APValue::MakeMemberPointer(const ValueDecl *Member, bool IsDerivedMember,
ArrayRef<const CXXRecordDecl*> Path) {
assert(isAbsent() && "Bad state change");
MemberPointerData *MPD = new ((void*)(char*)Data.buffer) MemberPointerData;
Kind = MemberPointer;
MPD->MemberAndIsDerivedMember.setPointer(Member);
MPD->MemberAndIsDerivedMember.setInt(IsDerivedMember);
MPD->resizePath(Path.size());
memcpy(MPD->getPath(), Path.data(), Path.size()*sizeof(const CXXRecordDecl*));
}
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