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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 "Linkage.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/CharUnits.h"
#include "clang/AST/DeclCXX.h"
#include "clang/AST/Expr.h"
#include "clang/AST/ExprCXX.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 ? cast<ValueDecl>(P->getCanonicalDecl()) : nullptr), 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;
}
QualType APValue::LValueBase::getType() const {
if (!*this) return QualType();
if (const ValueDecl *D = dyn_cast<const ValueDecl*>()) {
// FIXME: It's unclear where we're supposed to take the type from, and
// this actually matters for arrays of unknown bound. Eg:
//
// extern int arr[]; void f() { extern int arr[3]; };
// constexpr int *p = &arr[1]; // valid?
//
// For now, we take the most complete type we can find.
for (auto *Redecl = cast<ValueDecl>(D->getMostRecentDecl()); Redecl;
Redecl = cast_or_null<ValueDecl>(Redecl->getPreviousDecl())) {
QualType T = Redecl->getType();
if (!T->isIncompleteArrayType())
return T;
}
return D->getType();
}
if (is<TypeInfoLValue>())
return getTypeInfoType();
if (is<DynamicAllocLValue>())
return getDynamicAllocType();
const Expr *Base = get<const Expr*>();
// For a materialized temporary, the type of the temporary we materialized
// may not be the type of the expression.
if (const MaterializeTemporaryExpr *MTE =
clang::dyn_cast<MaterializeTemporaryExpr>(Base)) {
SmallVector<const Expr *, 2> CommaLHSs;
SmallVector<SubobjectAdjustment, 2> Adjustments;
const Expr *Temp = MTE->getSubExpr();
const Expr *Inner = Temp->skipRValueSubobjectAdjustments(CommaLHSs,
Adjustments);
// Keep any cv-qualifiers from the reference if we generated a temporary
// for it directly. Otherwise use the type after adjustment.
if (!Adjustments.empty())
return Inner->getType();
}
return Base->getType();
}
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);
}
void APValue::LValueBase::Profile(llvm::FoldingSetNodeID &ID) const {
ID.AddPointer(Ptr.getOpaqueValue());
if (is<TypeInfoLValue>() || is<DynamicAllocLValue>())
return;
ID.AddInteger(Local.CallIndex);
ID.AddInteger(Local.Version);
}
namespace clang {
bool operator==(const APValue::LValueBase &LHS,
const APValue::LValueBase &RHS) {
if (LHS.Ptr != RHS.Ptr)
return false;
if (LHS.is<TypeInfoLValue>() || LHS.is<DynamicAllocLValue>())
return true;
return LHS.Local.CallIndex == RHS.Local.CallIndex &&
LHS.Local.Version == RHS.Local.Version;
}
}
APValue::LValuePathEntry::LValuePathEntry(BaseOrMemberType BaseOrMember) {
if (const Decl *D = BaseOrMember.getPointer())
BaseOrMember.setPointer(D->getCanonicalDecl());
Value = reinterpret_cast<uintptr_t>(BaseOrMember.getOpaqueValue());
}
void APValue::LValuePathEntry::Profile(llvm::FoldingSetNodeID &ID) const {
ID.AddInteger(Value);
}
APValue::LValuePathSerializationHelper::LValuePathSerializationHelper(
ArrayRef<LValuePathEntry> Path, QualType ElemTy)
: ElemTy((const void *)ElemTy.getTypePtrOrNull()), Path(Path) {}
QualType APValue::LValuePathSerializationHelper::getType() {
return QualType::getFromOpaquePtr(ElemTy);
}
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() {
clang::APValue::LValueBase B;
B.Ptr = DenseMapInfo<const ValueDecl*>::getEmptyKey();
return B;
}
clang::APValue::LValueBase
llvm::DenseMapInfo<clang::APValue::LValueBase>::getTombstoneKey() {
clang::APValue::LValueBase B;
B.Ptr = DenseMapInfo<const ValueDecl*>::getTombstoneKey();
return B;
}
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)->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;
}
}
APValue::APValue(APValue &&RHS) : Kind(RHS.Kind), Data(RHS.Data) {
RHS.Kind = None;
}
APValue &APValue::operator=(const APValue &RHS) {
if (this != &RHS)
*this = APValue(RHS);
return *this;
}
APValue &APValue::operator=(APValue &&RHS) {
if (Kind != None && Kind != Indeterminate)
DestroyDataAndMakeUninit();
Kind = RHS.Kind;
Data = RHS.Data;
RHS.Kind = None;
return *this;
}
void APValue::DestroyDataAndMakeUninit() {
if (Kind == Int)
((APSInt *)(char *)&Data)->~APSInt();
else if (Kind == Float)
((APFloat *)(char *)&Data)->~APFloat();
else if (Kind == FixedPoint)
((APFixedPoint *)(char *)&Data)->~APFixedPoint();
else if (Kind == Vector)
((Vec *)(char *)&Data)->~Vec();
else if (Kind == ComplexInt)
((ComplexAPSInt *)(char *)&Data)->~ComplexAPSInt();
else if (Kind == ComplexFloat)
((ComplexAPFloat *)(char *)&Data)->~ComplexAPFloat();
else if (Kind == LValue)
((LV *)(char *)&Data)->~LV();
else if (Kind == Array)
((Arr *)(char *)&Data)->~Arr();
else if (Kind == Struct)
((StructData *)(char *)&Data)->~StructData();
else if (Kind == Union)
((UnionData *)(char *)&Data)->~UnionData();
else if (Kind == MemberPointer)
((MemberPointerData *)(char *)&Data)->~MemberPointerData();
else if (Kind == AddrLabelDiff)
((AddrLabelDiffData *)(char *)&Data)->~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)->hasPathPtr();
case MemberPointer:
return reinterpret_cast<const MemberPointerData *>(&Data)->hasPathPtr();
}
llvm_unreachable("Unknown APValue kind!");
}
void APValue::swap(APValue &RHS) {
std::swap(Kind, RHS.Kind);
std::swap(Data, RHS.Data);
}
/// Profile the value of an APInt, excluding its bit-width.
static void profileIntValue(llvm::FoldingSetNodeID &ID, const llvm::APInt &V) {
for (unsigned I = 0, N = V.getBitWidth(); I < N; I += 32)
ID.AddInteger((uint32_t)V.extractBitsAsZExtValue(std::min(32u, N - I), I));
}
void APValue::Profile(llvm::FoldingSetNodeID &ID) const {
// Note that our profiling assumes that only APValues of the same type are
// ever compared. As a result, we don't consider collisions that could only
// happen if the types are different. (For example, structs with different
// numbers of members could profile the same.)
ID.AddInteger(Kind);
switch (Kind) {
case None:
case Indeterminate:
return;
case AddrLabelDiff:
ID.AddPointer(getAddrLabelDiffLHS()->getLabel()->getCanonicalDecl());
ID.AddPointer(getAddrLabelDiffRHS()->getLabel()->getCanonicalDecl());
return;
case Struct:
for (unsigned I = 0, N = getStructNumBases(); I != N; ++I)
getStructBase(I).Profile(ID);
for (unsigned I = 0, N = getStructNumFields(); I != N; ++I)
getStructField(I).Profile(ID);
return;
case Union:
if (!getUnionField()) {
ID.AddInteger(0);
return;
}
ID.AddInteger(getUnionField()->getFieldIndex() + 1);
getUnionValue().Profile(ID);
return;
case Array: {
if (getArraySize() == 0)
return;
// The profile should not depend on whether the array is expanded or
// not, but we don't want to profile the array filler many times for
// a large array. So treat all equal trailing elements as the filler.
// Elements are profiled in reverse order to support this, and the
// first profiled element is followed by a count. For example:
//
// ['a', 'c', 'x', 'x', 'x'] is profiled as
// [5, 'x', 3, 'c', 'a']
llvm::FoldingSetNodeID FillerID;
(hasArrayFiller() ? getArrayFiller()
: getArrayInitializedElt(getArrayInitializedElts() - 1))
.Profile(FillerID);
ID.AddNodeID(FillerID);
unsigned NumFillers = getArraySize() - getArrayInitializedElts();
unsigned N = getArrayInitializedElts();
// Count the number of elements equal to the last one. This loop ends
// by adding an integer indicating the number of such elements, with
// N set to the number of elements left to profile.
while (true) {
if (N == 0) {
// All elements are fillers.
assert(NumFillers == getArraySize());
ID.AddInteger(NumFillers);
break;
}
// No need to check if the last element is equal to the last
// element.
if (N != getArraySize()) {
llvm::FoldingSetNodeID ElemID;
getArrayInitializedElt(N - 1).Profile(ElemID);
if (ElemID != FillerID) {
ID.AddInteger(NumFillers);
ID.AddNodeID(ElemID);
--N;
break;
}
}
// This is a filler.
++NumFillers;
--N;
}
// Emit the remaining elements.
for (; N != 0; --N)
getArrayInitializedElt(N - 1).Profile(ID);
return;
}
case Vector:
for (unsigned I = 0, N = getVectorLength(); I != N; ++I)
getVectorElt(I).Profile(ID);
return;
case Int:
profileIntValue(ID, getInt());
return;
case Float:
profileIntValue(ID, getFloat().bitcastToAPInt());
return;
case FixedPoint:
profileIntValue(ID, getFixedPoint().getValue());
return;
case ComplexFloat:
profileIntValue(ID, getComplexFloatReal().bitcastToAPInt());
profileIntValue(ID, getComplexFloatImag().bitcastToAPInt());
return;
case ComplexInt:
profileIntValue(ID, getComplexIntReal());
profileIntValue(ID, getComplexIntImag());
return;
case LValue:
getLValueBase().Profile(ID);
ID.AddInteger(getLValueOffset().getQuantity());
ID.AddInteger((isNullPointer() ? 1 : 0) |
(isLValueOnePastTheEnd() ? 2 : 0) |
(hasLValuePath() ? 4 : 0));
if (hasLValuePath()) {
ID.AddInteger(getLValuePath().size());
// For uniqueness, we only need to profile the entries corresponding
// to union members, but we don't have the type here so we don't know
// how to interpret the entries.
for (LValuePathEntry E : getLValuePath())
E.Profile(ID);
}
return;
case MemberPointer:
ID.AddPointer(getMemberPointerDecl());
ID.AddInteger(isMemberPointerToDerivedMember());
for (const CXXRecordDecl *D : getMemberPointerPath())
ID.AddPointer(D);
return;
}
llvm_unreachable("Unknown APValue kind!");
}
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();
}
static bool TryPrintAsStringLiteral(raw_ostream &Out,
const PrintingPolicy &Policy,
const ArrayType *ATy,
ArrayRef<APValue> Inits) {
if (Inits.empty())
return false;
QualType Ty = ATy->getElementType();
if (!Ty->isAnyCharacterType())
return false;
// Nothing we can do about a sequence that is not null-terminated
if (!Inits.back().getInt().isZero())
return false;
else
Inits = Inits.drop_back();
llvm::SmallString<40> Buf;
Buf.push_back('"');
// Better than printing a two-digit sequence of 10 integers.
constexpr size_t MaxN = 36;
StringRef Ellipsis;
if (Inits.size() > MaxN && !Policy.EntireContentsOfLargeArray) {
Ellipsis = "[...]";
Inits =
Inits.take_front(std::min(MaxN - Ellipsis.size() / 2, Inits.size()));
}
for (auto &Val : Inits) {
int64_t Char64 = Val.getInt().getExtValue();
if (!isASCII(Char64))
return false; // Bye bye, see you in integers.
auto Ch = static_cast<unsigned char>(Char64);
// The diagnostic message is 'quoted'
StringRef Escaped = escapeCStyle<EscapeChar::SingleAndDouble>(Ch);
if (Escaped.empty()) {
if (!isPrintable(Ch))
return false;
Buf.emplace_back(Ch);
} else {
Buf.append(Escaped);
}
}
Buf.append(Ellipsis);
Buf.push_back('"');
if (Ty->isWideCharType())
Out << 'L';
else if (Ty->isChar8Type())
Out << "u8";
else if (Ty->isChar16Type())
Out << 'u';
else if (Ty->isChar32Type())
Out << 'U';
Out << Buf;
return true;
}
void APValue::printPretty(raw_ostream &Out, const ASTContext &Ctx,
QualType Ty) const {
printPretty(Out, Ctx.getPrintingPolicy(), Ty, &Ctx);
}
void APValue::printPretty(raw_ostream &Out, const PrintingPolicy &Policy,
QualType Ty, const ASTContext *Ctx) 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, Policy, ElemTy, Ctx);
for (unsigned i = 1; i != getVectorLength(); ++i) {
Out << ", ";
getVectorElt(i).printPretty(Out, Policy, ElemTy, Ctx);
}
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 << (Policy.Nullptr ? "nullptr" : "0");
} else if (IsReference) {
Out << "*(" << InnerTy.stream(Policy) << "*)"
<< getLValueOffset().getQuantity();
} else {
Out << "(" << Ty.stream(Policy) << ")"
<< getLValueOffset().getQuantity();
}
return;
}
if (!hasLValuePath()) {
// No lvalue path: just print the offset.
CharUnits O = getLValueOffset();
CharUnits S = Ctx ? Ctx->getTypeSizeInCharsIfKnown(InnerTy).getValueOr(
CharUnits::Zero())
: CharUnits::Zero();
if (!O.isZero()) {
if (IsReference)
Out << "*(";
if (S.isZero() || 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, Policy);
} else if (DynamicAllocLValue DA = Base.dyn_cast<DynamicAllocLValue>()) {
Out << "{*new "
<< Base.getDynamicAllocType().stream(Policy) << "#"
<< DA.getIndex() << "}";
} else {
assert(Base.get<const Expr *>() != nullptr &&
"Expecting non-null Expr");
Base.get<const Expr*>()->printPretty(Out, nullptr, Policy);
}
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 = Base.getType();
if (const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>()) {
Out << *VD;
} else if (TypeInfoLValue TI = Base.dyn_cast<TypeInfoLValue>()) {
TI.print(Out, Policy);
} else if (DynamicAllocLValue DA = Base.dyn_cast<DynamicAllocLValue>()) {
Out << "{*new " << Base.getDynamicAllocType().stream(Policy) << "#"
<< DA.getIndex() << "}";
} else {
const Expr *E = Base.get<const Expr*>();
assert(E != nullptr && "Expecting non-null Expr");
E->printPretty(Out, nullptr, Policy);
}
ArrayRef<LValuePathEntry> Path = getLValuePath();
const CXXRecordDecl *CastToBase = nullptr;
for (unsigned I = 0, N = Path.size(); I != N; ++I) {
if (ElemTy->isRecordType()) {
// 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;
// Leave ElemTy referring to the most-derived class. The actual type
// doesn't matter except for array types.
} 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 = ElemTy->castAsArrayTypeUnsafe()->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 = Ty->castAsArrayTypeUnsafe();
unsigned N = getArrayInitializedElts();
if (N != 0 && TryPrintAsStringLiteral(Out, Policy, AT,
{&getArrayInitializedElt(0), N}))
return;
QualType ElemTy = AT->getElementType();
Out << '{';
unsigned I = 0;
switch (N) {
case 0:
for (; I != N; ++I) {
Out << ", ";
if (I == 10 && !Policy.EntireContentsOfLargeArray) {
Out << "...}";
return;
}
LLVM_FALLTHROUGH;
default:
getArrayInitializedElt(I).printPretty(Out, Policy, ElemTy, Ctx);
}
}
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, Policy, BI->getType(), Ctx);
First = false;
}
}
for (const auto *FI : RD->fields()) {
if (!First)
Out << ", ";
if (FI->isUnnamedBitfield()) continue;
getStructField(FI->getFieldIndex()).
printPretty(Out, Policy, FI->getType(), Ctx);
First = false;
}
Out << '}';
return;
}
case APValue::Union:
Out << '{';
if (const FieldDecl *FD = getUnionField()) {
Out << "." << *FD << " = ";
getUnionValue().printPretty(Out, Policy, FD->getType(), Ctx);
}
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)->Base;
}
bool APValue::isLValueOnePastTheEnd() const {
assert(isLValue() && "Invalid accessor");
return ((const LV *)(const void *)&Data)->IsOnePastTheEnd;
}
CharUnits &APValue::getLValueOffset() {
assert(isLValue() && "Invalid accessor");
return ((LV *)(void *)&Data)->Offset;
}
bool APValue::hasLValuePath() const {
assert(isLValue() && "Invalid accessor");
return ((const LV *)(const char *)&Data)->hasPath();
}
ArrayRef<APValue::LValuePathEntry> APValue::getLValuePath() const {
assert(isLValue() && hasLValuePath() && "Invalid accessor");
const LV &LVal = *((const LV *)(const char *)&Data);
return llvm::makeArrayRef(LVal.getPath(), LVal.PathLength);
}
unsigned APValue::getLValueCallIndex() const {
assert(isLValue() && "Invalid accessor");
return ((const LV *)(const char *)&Data)->Base.getCallIndex();
}
unsigned APValue::getLValueVersion() const {
assert(isLValue() && "Invalid accessor");
return ((const LV *)(const char *)&Data)->Base.getVersion();
}
bool APValue::isNullPointer() const {
assert(isLValue() && "Invalid usage");
return ((const LV *)(const char *)&Data)->IsNullPtr;
}
void APValue::setLValue(LValueBase B, const CharUnits &O, NoLValuePath,
bool IsNullPtr) {
assert(isLValue() && "Invalid accessor");
LV &LVal = *((LV *)(char *)&Data);
LVal.Base = B;
LVal.IsOnePastTheEnd = false;
LVal.Offset = O;
LVal.resizePath((unsigned)-1);
LVal.IsNullPtr = IsNullPtr;
}
MutableArrayRef<APValue::LValuePathEntry>
APValue::setLValueUninit(LValueBase B, const CharUnits &O, unsigned Size,
bool IsOnePastTheEnd, bool IsNullPtr) {
assert(isLValue() && "Invalid accessor");
LV &LVal = *((LV *)(char *)&Data);
LVal.Base = B;
LVal.IsOnePastTheEnd = IsOnePastTheEnd;
LVal.Offset = O;
LVal.IsNullPtr = IsNullPtr;
LVal.resizePath(Size);
return {LVal.getPath(), Size};
}
void APValue::setLValue(LValueBase B, const CharUnits &O,
ArrayRef<LValuePathEntry> Path, bool IsOnePastTheEnd,
bool IsNullPtr) {
MutableArrayRef<APValue::LValuePathEntry> InternalPath =
setLValueUninit(B, O, Path.size(), IsOnePastTheEnd, IsNullPtr);
if (Path.size()) {
memcpy(InternalPath.data(), Path.data(),
Path.size() * sizeof(LValuePathEntry));
}
}
void APValue::setUnion(const FieldDecl *Field, const APValue &Value) {
assert(isUnion() && "Invalid accessor");
((UnionData *)(char *)&Data)->Field =
Field ? Field->getCanonicalDecl() : nullptr;
*((UnionData *)(char *)&Data)->Value = Value;
}
const ValueDecl *APValue::getMemberPointerDecl() const {
assert(isMemberPointer() && "Invalid accessor");
const MemberPointerData &MPD =
*((const MemberPointerData *)(const char *)&Data);
return MPD.MemberAndIsDerivedMember.getPointer();
}
bool APValue::isMemberPointerToDerivedMember() const {
assert(isMemberPointer() && "Invalid accessor");
const MemberPointerData &MPD =
*((const MemberPointerData *)(const char *)&Data);
return MPD.MemberAndIsDerivedMember.getInt();
}
ArrayRef<const CXXRecordDecl*> APValue::getMemberPointerPath() const {
assert(isMemberPointer() && "Invalid accessor");
const MemberPointerData &MPD =
*((const MemberPointerData *)(const char *)&Data);
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) LV();
Kind = LValue;
}
void APValue::MakeArray(unsigned InitElts, unsigned Size) {
assert(isAbsent() && "Bad state change");
new ((void *)(char *)&Data) Arr(InitElts, Size);
Kind = Array;
}
MutableArrayRef<APValue::LValuePathEntry>
setLValueUninit(APValue::LValueBase B, const CharUnits &O, unsigned Size,
bool OnePastTheEnd, bool IsNullPtr);
MutableArrayRef<const CXXRecordDecl *>
APValue::setMemberPointerUninit(const ValueDecl *Member, bool IsDerivedMember,
unsigned Size) {
assert(isAbsent() && "Bad state change");
MemberPointerData *MPD = new ((void *)(char *)&Data) MemberPointerData;
Kind = MemberPointer;
MPD->MemberAndIsDerivedMember.setPointer(
Member ? cast<ValueDecl>(Member->getCanonicalDecl()) : nullptr);
MPD->MemberAndIsDerivedMember.setInt(IsDerivedMember);
MPD->resizePath(Size);
return {MPD->getPath(), MPD->PathLength};
}
void APValue::MakeMemberPointer(const ValueDecl *Member, bool IsDerivedMember,
ArrayRef<const CXXRecordDecl *> Path) {
MutableArrayRef<const CXXRecordDecl *> InternalPath =
setMemberPointerUninit(Member, IsDerivedMember, Path.size());
for (unsigned I = 0; I != Path.size(); ++I)
InternalPath[I] = Path[I]->getCanonicalDecl();
}
LinkageInfo LinkageComputer::getLVForValue(const APValue &V,
LVComputationKind computation) {
LinkageInfo LV = LinkageInfo::external();
auto MergeLV = [&](LinkageInfo MergeLV) {
LV.merge(MergeLV);
return LV.getLinkage() == InternalLinkage;
};
auto Merge = [&](const APValue &V) {
return MergeLV(getLVForValue(V, computation));
};
switch (V.getKind()) {
case APValue::None:
case APValue::Indeterminate:
case APValue::Int:
case APValue::Float:
case APValue::FixedPoint:
case APValue::ComplexInt:
case APValue::ComplexFloat:
case APValue::Vector:
break;
case APValue::AddrLabelDiff:
// Even for an inline function, it's not reasonable to treat a difference
// between the addresses of labels as an external value.
return LinkageInfo::internal();
case APValue::Struct: {
for (unsigned I = 0, N = V.getStructNumBases(); I != N; ++I)
if (Merge(V.getStructBase(I)))
break;
for (unsigned I = 0, N = V.getStructNumFields(); I != N; ++I)
if (Merge(V.getStructField(I)))
break;
break;
}
case APValue::Union:
if (V.getUnionField())
Merge(V.getUnionValue());
break;
case APValue::Array: {
for (unsigned I = 0, N = V.getArrayInitializedElts(); I != N; ++I)
if (Merge(V.getArrayInitializedElt(I)))
break;
if (V.hasArrayFiller())
Merge(V.getArrayFiller());
break;
}
case APValue::LValue: {
if (!V.getLValueBase()) {
// Null or absolute address: this is external.
} else if (const auto *VD =
V.getLValueBase().dyn_cast<const ValueDecl *>()) {
if (VD && MergeLV(getLVForDecl(VD, computation)))
break;
} else if (const auto TI = V.getLValueBase().dyn_cast<TypeInfoLValue>()) {
if (MergeLV(getLVForType(*TI.getType(), computation)))
break;
} else if (const Expr *E = V.getLValueBase().dyn_cast<const Expr *>()) {
// Almost all expression bases are internal. The exception is
// lifetime-extended temporaries.
// FIXME: These should be modeled as having the
// LifetimeExtendedTemporaryDecl itself as the base.
// FIXME: If we permit Objective-C object literals in template arguments,
// they should not imply internal linkage.
auto *MTE = dyn_cast<MaterializeTemporaryExpr>(E);
if (!MTE || MTE->getStorageDuration() == SD_FullExpression)
return LinkageInfo::internal();
if (MergeLV(getLVForDecl(MTE->getExtendingDecl(), computation)))
break;
} else {
assert(V.getLValueBase().is<DynamicAllocLValue>() &&
"unexpected LValueBase kind");
return LinkageInfo::internal();
}
// The lvalue path doesn't matter: pointers to all subobjects always have
// the same visibility as pointers to the complete object.
break;
}
case APValue::MemberPointer:
if (const NamedDecl *D = V.getMemberPointerDecl())
MergeLV(getLVForDecl(D, computation));
// Note that we could have a base-to-derived conversion here to a member of
// a derived class with less linkage/visibility. That's covered by the
// linkage and visibility of the value's type.
break;
}
return LV;
}
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