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      1 //===--- APValue.cpp - Union class for APFloat/APSInt/Complex -------------===//
      2 //
      3 //                     The LLVM Compiler Infrastructure
      4 //
      5 // This file is distributed under the University of Illinois Open Source
      6 // License. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 //
     10 //  This file implements the APValue class.
     11 //
     12 //===----------------------------------------------------------------------===//
     13 
     14 #include "clang/AST/APValue.h"
     15 #include "clang/AST/ASTContext.h"
     16 #include "clang/AST/CharUnits.h"
     17 #include "clang/AST/DeclCXX.h"
     18 #include "clang/AST/Expr.h"
     19 #include "clang/AST/Type.h"
     20 #include "clang/Basic/Diagnostic.h"
     21 #include "llvm/ADT/SmallString.h"
     22 #include "llvm/Support/ErrorHandling.h"
     23 #include "llvm/Support/raw_ostream.h"
     24 using namespace clang;
     25 
     26 namespace {
     27   struct LVBase {
     28     llvm::PointerIntPair<APValue::LValueBase, 1, bool> BaseAndIsOnePastTheEnd;
     29     CharUnits Offset;
     30     unsigned PathLength;
     31     unsigned CallIndex;
     32   };
     33 }
     34 
     35 struct APValue::LV : LVBase {
     36   static const unsigned InlinePathSpace =
     37       (MaxSize - sizeof(LVBase)) / sizeof(LValuePathEntry);
     38 
     39   /// Path - The sequence of base classes, fields and array indices to follow to
     40   /// walk from Base to the subobject. When performing GCC-style folding, there
     41   /// may not be such a path.
     42   union {
     43     LValuePathEntry Path[InlinePathSpace];
     44     LValuePathEntry *PathPtr;
     45   };
     46 
     47   LV() { PathLength = (unsigned)-1; }
     48   ~LV() { resizePath(0); }
     49 
     50   void resizePath(unsigned Length) {
     51     if (Length == PathLength)
     52       return;
     53     if (hasPathPtr())
     54       delete [] PathPtr;
     55     PathLength = Length;
     56     if (hasPathPtr())
     57       PathPtr = new LValuePathEntry[Length];
     58   }
     59 
     60   bool hasPath() const { return PathLength != (unsigned)-1; }
     61   bool hasPathPtr() const { return hasPath() && PathLength > InlinePathSpace; }
     62 
     63   LValuePathEntry *getPath() { return hasPathPtr() ? PathPtr : Path; }
     64   const LValuePathEntry *getPath() const {
     65     return hasPathPtr() ? PathPtr : Path;
     66   }
     67 };
     68 
     69 namespace {
     70   struct MemberPointerBase {
     71     llvm::PointerIntPair<const ValueDecl*, 1, bool> MemberAndIsDerivedMember;
     72     unsigned PathLength;
     73   };
     74 }
     75 
     76 struct APValue::MemberPointerData : MemberPointerBase {
     77   static const unsigned InlinePathSpace =
     78       (MaxSize - sizeof(MemberPointerBase)) / sizeof(const CXXRecordDecl*);
     79   typedef const CXXRecordDecl *PathElem;
     80   union {
     81     PathElem Path[InlinePathSpace];
     82     PathElem *PathPtr;
     83   };
     84 
     85   MemberPointerData() { PathLength = 0; }
     86   ~MemberPointerData() { resizePath(0); }
     87 
     88   void resizePath(unsigned Length) {
     89     if (Length == PathLength)
     90       return;
     91     if (hasPathPtr())
     92       delete [] PathPtr;
     93     PathLength = Length;
     94     if (hasPathPtr())
     95       PathPtr = new PathElem[Length];
     96   }
     97 
     98   bool hasPathPtr() const { return PathLength > InlinePathSpace; }
     99 
    100   PathElem *getPath() { return hasPathPtr() ? PathPtr : Path; }
    101   const PathElem *getPath() const {
    102     return hasPathPtr() ? PathPtr : Path;
    103   }
    104 };
    105 
    106 // FIXME: Reduce the malloc traffic here.
    107 
    108 APValue::Arr::Arr(unsigned NumElts, unsigned Size) :
    109   Elts(new APValue[NumElts + (NumElts != Size ? 1 : 0)]),
    110   NumElts(NumElts), ArrSize(Size) {}
    111 APValue::Arr::~Arr() { delete [] Elts; }
    112 
    113 APValue::StructData::StructData(unsigned NumBases, unsigned NumFields) :
    114   Elts(new APValue[NumBases+NumFields]),
    115   NumBases(NumBases), NumFields(NumFields) {}
    116 APValue::StructData::~StructData() {
    117   delete [] Elts;
    118 }
    119 
    120 APValue::UnionData::UnionData() : Field(0), Value(new APValue) {}
    121 APValue::UnionData::~UnionData () {
    122   delete Value;
    123 }
    124 
    125 APValue::APValue(const APValue &RHS) : Kind(Uninitialized) {
    126   switch (RHS.getKind()) {
    127   case Uninitialized:
    128     break;
    129   case Int:
    130     MakeInt();
    131     setInt(RHS.getInt());
    132     break;
    133   case Float:
    134     MakeFloat();
    135     setFloat(RHS.getFloat());
    136     break;
    137   case Vector:
    138     MakeVector();
    139     setVector(((const Vec *)(const char *)RHS.Data)->Elts,
    140               RHS.getVectorLength());
    141     break;
    142   case ComplexInt:
    143     MakeComplexInt();
    144     setComplexInt(RHS.getComplexIntReal(), RHS.getComplexIntImag());
    145     break;
    146   case ComplexFloat:
    147     MakeComplexFloat();
    148     setComplexFloat(RHS.getComplexFloatReal(), RHS.getComplexFloatImag());
    149     break;
    150   case LValue:
    151     MakeLValue();
    152     if (RHS.hasLValuePath())
    153       setLValue(RHS.getLValueBase(), RHS.getLValueOffset(), RHS.getLValuePath(),
    154                 RHS.isLValueOnePastTheEnd(), RHS.getLValueCallIndex());
    155     else
    156       setLValue(RHS.getLValueBase(), RHS.getLValueOffset(), NoLValuePath(),
    157                 RHS.getLValueCallIndex());
    158     break;
    159   case Array:
    160     MakeArray(RHS.getArrayInitializedElts(), RHS.getArraySize());
    161     for (unsigned I = 0, N = RHS.getArrayInitializedElts(); I != N; ++I)
    162       getArrayInitializedElt(I) = RHS.getArrayInitializedElt(I);
    163     if (RHS.hasArrayFiller())
    164       getArrayFiller() = RHS.getArrayFiller();
    165     break;
    166   case Struct:
    167     MakeStruct(RHS.getStructNumBases(), RHS.getStructNumFields());
    168     for (unsigned I = 0, N = RHS.getStructNumBases(); I != N; ++I)
    169       getStructBase(I) = RHS.getStructBase(I);
    170     for (unsigned I = 0, N = RHS.getStructNumFields(); I != N; ++I)
    171       getStructField(I) = RHS.getStructField(I);
    172     break;
    173   case Union:
    174     MakeUnion();
    175     setUnion(RHS.getUnionField(), RHS.getUnionValue());
    176     break;
    177   case MemberPointer:
    178     MakeMemberPointer(RHS.getMemberPointerDecl(),
    179                       RHS.isMemberPointerToDerivedMember(),
    180                       RHS.getMemberPointerPath());
    181     break;
    182   case AddrLabelDiff:
    183     MakeAddrLabelDiff();
    184     setAddrLabelDiff(RHS.getAddrLabelDiffLHS(), RHS.getAddrLabelDiffRHS());
    185     break;
    186   }
    187 }
    188 
    189 void APValue::DestroyDataAndMakeUninit() {
    190   if (Kind == Int)
    191     ((APSInt*)(char*)Data)->~APSInt();
    192   else if (Kind == Float)
    193     ((APFloat*)(char*)Data)->~APFloat();
    194   else if (Kind == Vector)
    195     ((Vec*)(char*)Data)->~Vec();
    196   else if (Kind == ComplexInt)
    197     ((ComplexAPSInt*)(char*)Data)->~ComplexAPSInt();
    198   else if (Kind == ComplexFloat)
    199     ((ComplexAPFloat*)(char*)Data)->~ComplexAPFloat();
    200   else if (Kind == LValue)
    201     ((LV*)(char*)Data)->~LV();
    202   else if (Kind == Array)
    203     ((Arr*)(char*)Data)->~Arr();
    204   else if (Kind == Struct)
    205     ((StructData*)(char*)Data)->~StructData();
    206   else if (Kind == Union)
    207     ((UnionData*)(char*)Data)->~UnionData();
    208   else if (Kind == MemberPointer)
    209     ((MemberPointerData*)(char*)Data)->~MemberPointerData();
    210   else if (Kind == AddrLabelDiff)
    211     ((AddrLabelDiffData*)(char*)Data)->~AddrLabelDiffData();
    212   Kind = Uninitialized;
    213 }
    214 
    215 void APValue::swap(APValue &RHS) {
    216   std::swap(Kind, RHS.Kind);
    217   char TmpData[MaxSize];
    218   memcpy(TmpData, Data, MaxSize);
    219   memcpy(Data, RHS.Data, MaxSize);
    220   memcpy(RHS.Data, TmpData, MaxSize);
    221 }
    222 
    223 void APValue::dump() const {
    224   dump(llvm::errs());
    225   llvm::errs() << '\n';
    226 }
    227 
    228 static double GetApproxValue(const llvm::APFloat &F) {
    229   llvm::APFloat V = F;
    230   bool ignored;
    231   V.convert(llvm::APFloat::IEEEdouble, llvm::APFloat::rmNearestTiesToEven,
    232             &ignored);
    233   return V.convertToDouble();
    234 }
    235 
    236 void APValue::dump(raw_ostream &OS) const {
    237   switch (getKind()) {
    238   case Uninitialized:
    239     OS << "Uninitialized";
    240     return;
    241   case Int:
    242     OS << "Int: " << getInt();
    243     return;
    244   case Float:
    245     OS << "Float: " << GetApproxValue(getFloat());
    246     return;
    247   case Vector:
    248     OS << "Vector: ";
    249     getVectorElt(0).dump(OS);
    250     for (unsigned i = 1; i != getVectorLength(); ++i) {
    251       OS << ", ";
    252       getVectorElt(i).dump(OS);
    253     }
    254     return;
    255   case ComplexInt:
    256     OS << "ComplexInt: " << getComplexIntReal() << ", " << getComplexIntImag();
    257     return;
    258   case ComplexFloat:
    259     OS << "ComplexFloat: " << GetApproxValue(getComplexFloatReal())
    260        << ", " << GetApproxValue(getComplexFloatImag());
    261     return;
    262   case LValue:
    263     OS << "LValue: <todo>";
    264     return;
    265   case Array:
    266     OS << "Array: ";
    267     for (unsigned I = 0, N = getArrayInitializedElts(); I != N; ++I) {
    268       getArrayInitializedElt(I).dump(OS);
    269       if (I != getArraySize() - 1) OS << ", ";
    270     }
    271     if (hasArrayFiller()) {
    272       OS << getArraySize() - getArrayInitializedElts() << " x ";
    273       getArrayFiller().dump(OS);
    274     }
    275     return;
    276   case Struct:
    277     OS << "Struct ";
    278     if (unsigned N = getStructNumBases()) {
    279       OS << " bases: ";
    280       getStructBase(0).dump(OS);
    281       for (unsigned I = 1; I != N; ++I) {
    282         OS << ", ";
    283         getStructBase(I).dump(OS);
    284       }
    285     }
    286     if (unsigned N = getStructNumFields()) {
    287       OS << " fields: ";
    288       getStructField(0).dump(OS);
    289       for (unsigned I = 1; I != N; ++I) {
    290         OS << ", ";
    291         getStructField(I).dump(OS);
    292       }
    293     }
    294     return;
    295   case Union:
    296     OS << "Union: ";
    297     getUnionValue().dump(OS);
    298     return;
    299   case MemberPointer:
    300     OS << "MemberPointer: <todo>";
    301     return;
    302   case AddrLabelDiff:
    303     OS << "AddrLabelDiff: <todo>";
    304     return;
    305   }
    306   llvm_unreachable("Unknown APValue kind!");
    307 }
    308 
    309 void APValue::printPretty(raw_ostream &Out, ASTContext &Ctx, QualType Ty) const{
    310   switch (getKind()) {
    311   case APValue::Uninitialized:
    312     Out << "<uninitialized>";
    313     return;
    314   case APValue::Int:
    315     if (Ty->isBooleanType())
    316       Out << (getInt().getBoolValue() ? "true" : "false");
    317     else
    318       Out << getInt();
    319     return;
    320   case APValue::Float:
    321     Out << GetApproxValue(getFloat());
    322     return;
    323   case APValue::Vector: {
    324     Out << '{';
    325     QualType ElemTy = Ty->getAs<VectorType>()->getElementType();
    326     getVectorElt(0).printPretty(Out, Ctx, ElemTy);
    327     for (unsigned i = 1; i != getVectorLength(); ++i) {
    328       Out << ", ";
    329       getVectorElt(i).printPretty(Out, Ctx, ElemTy);
    330     }
    331     Out << '}';
    332     return;
    333   }
    334   case APValue::ComplexInt:
    335     Out << getComplexIntReal() << "+" << getComplexIntImag() << "i";
    336     return;
    337   case APValue::ComplexFloat:
    338     Out << GetApproxValue(getComplexFloatReal()) << "+"
    339         << GetApproxValue(getComplexFloatImag()) << "i";
    340     return;
    341   case APValue::LValue: {
    342     LValueBase Base = getLValueBase();
    343     if (!Base) {
    344       Out << "0";
    345       return;
    346     }
    347 
    348     bool IsReference = Ty->isReferenceType();
    349     QualType InnerTy
    350       = IsReference ? Ty.getNonReferenceType() : Ty->getPointeeType();
    351     if (InnerTy.isNull())
    352       InnerTy = Ty;
    353 
    354     if (!hasLValuePath()) {
    355       // No lvalue path: just print the offset.
    356       CharUnits O = getLValueOffset();
    357       CharUnits S = Ctx.getTypeSizeInChars(InnerTy);
    358       if (!O.isZero()) {
    359         if (IsReference)
    360           Out << "*(";
    361         if (O % S) {
    362           Out << "(char*)";
    363           S = CharUnits::One();
    364         }
    365         Out << '&';
    366       } else if (!IsReference)
    367         Out << '&';
    368 
    369       if (const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>())
    370         Out << *VD;
    371       else
    372         Base.get<const Expr*>()->printPretty(Out, 0, Ctx.getPrintingPolicy());
    373       if (!O.isZero()) {
    374         Out << " + " << (O / S);
    375         if (IsReference)
    376           Out << ')';
    377       }
    378       return;
    379     }
    380 
    381     // We have an lvalue path. Print it out nicely.
    382     if (!IsReference)
    383       Out << '&';
    384     else if (isLValueOnePastTheEnd())
    385       Out << "*(&";
    386 
    387     QualType ElemTy;
    388     if (const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>()) {
    389       Out << *VD;
    390       ElemTy = VD->getType();
    391     } else {
    392       const Expr *E = Base.get<const Expr*>();
    393       E->printPretty(Out, 0, Ctx.getPrintingPolicy());
    394       ElemTy = E->getType();
    395     }
    396 
    397     ArrayRef<LValuePathEntry> Path = getLValuePath();
    398     const CXXRecordDecl *CastToBase = 0;
    399     for (unsigned I = 0, N = Path.size(); I != N; ++I) {
    400       if (ElemTy->getAs<RecordType>()) {
    401         // The lvalue refers to a class type, so the next path entry is a base
    402         // or member.
    403         const Decl *BaseOrMember =
    404         BaseOrMemberType::getFromOpaqueValue(Path[I].BaseOrMember).getPointer();
    405         if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(BaseOrMember)) {
    406           CastToBase = RD;
    407           ElemTy = Ctx.getRecordType(RD);
    408         } else {
    409           const ValueDecl *VD = cast<ValueDecl>(BaseOrMember);
    410           Out << ".";
    411           if (CastToBase)
    412             Out << *CastToBase << "::";
    413           Out << *VD;
    414           ElemTy = VD->getType();
    415         }
    416       } else {
    417         // The lvalue must refer to an array.
    418         Out << '[' << Path[I].ArrayIndex << ']';
    419         ElemTy = Ctx.getAsArrayType(ElemTy)->getElementType();
    420       }
    421     }
    422 
    423     // Handle formatting of one-past-the-end lvalues.
    424     if (isLValueOnePastTheEnd()) {
    425       // FIXME: If CastToBase is non-0, we should prefix the output with
    426       // "(CastToBase*)".
    427       Out << " + 1";
    428       if (IsReference)
    429         Out << ')';
    430     }
    431     return;
    432   }
    433   case APValue::Array: {
    434     const ArrayType *AT = Ctx.getAsArrayType(Ty);
    435     QualType ElemTy = AT->getElementType();
    436     Out << '{';
    437     if (unsigned N = getArrayInitializedElts()) {
    438       getArrayInitializedElt(0).printPretty(Out, Ctx, ElemTy);
    439       for (unsigned I = 1; I != N; ++I) {
    440         Out << ", ";
    441         if (I == 10) {
    442           // Avoid printing out the entire contents of large arrays.
    443           Out << "...";
    444           break;
    445         }
    446         getArrayInitializedElt(I).printPretty(Out, Ctx, ElemTy);
    447       }
    448     }
    449     Out << '}';
    450     return;
    451   }
    452   case APValue::Struct: {
    453     Out << '{';
    454     const RecordDecl *RD = Ty->getAs<RecordType>()->getDecl();
    455     bool First = true;
    456     if (unsigned N = getStructNumBases()) {
    457       const CXXRecordDecl *CD = cast<CXXRecordDecl>(RD);
    458       CXXRecordDecl::base_class_const_iterator BI = CD->bases_begin();
    459       for (unsigned I = 0; I != N; ++I, ++BI) {
    460         assert(BI != CD->bases_end());
    461         if (!First)
    462           Out << ", ";
    463         getStructBase(I).printPretty(Out, Ctx, BI->getType());
    464         First = false;
    465       }
    466     }
    467     for (RecordDecl::field_iterator FI = RD->field_begin();
    468          FI != RD->field_end(); ++FI) {
    469       if (!First)
    470         Out << ", ";
    471       if (FI->isUnnamedBitfield()) continue;
    472       getStructField(FI->getFieldIndex()).
    473         printPretty(Out, Ctx, FI->getType());
    474       First = false;
    475     }
    476     Out << '}';
    477     return;
    478   }
    479   case APValue::Union:
    480     Out << '{';
    481     if (const FieldDecl *FD = getUnionField()) {
    482       Out << "." << *FD << " = ";
    483       getUnionValue().printPretty(Out, Ctx, FD->getType());
    484     }
    485     Out << '}';
    486     return;
    487   case APValue::MemberPointer:
    488     // FIXME: This is not enough to unambiguously identify the member in a
    489     // multiple-inheritance scenario.
    490     if (const ValueDecl *VD = getMemberPointerDecl()) {
    491       Out << '&' << *cast<CXXRecordDecl>(VD->getDeclContext()) << "::" << *VD;
    492       return;
    493     }
    494     Out << "0";
    495     return;
    496   case APValue::AddrLabelDiff:
    497     Out << "&&" << getAddrLabelDiffLHS()->getLabel()->getName();
    498     Out << " - ";
    499     Out << "&&" << getAddrLabelDiffRHS()->getLabel()->getName();
    500     return;
    501   }
    502   llvm_unreachable("Unknown APValue kind!");
    503 }
    504 
    505 std::string APValue::getAsString(ASTContext &Ctx, QualType Ty) const {
    506   std::string Result;
    507   llvm::raw_string_ostream Out(Result);
    508   printPretty(Out, Ctx, Ty);
    509   Out.flush();
    510   return Result;
    511 }
    512 
    513 const APValue::LValueBase APValue::getLValueBase() const {
    514   assert(isLValue() && "Invalid accessor");
    515   return ((const LV*)(const void*)Data)->BaseAndIsOnePastTheEnd.getPointer();
    516 }
    517 
    518 bool APValue::isLValueOnePastTheEnd() const {
    519   assert(isLValue() && "Invalid accessor");
    520   return ((const LV*)(const void*)Data)->BaseAndIsOnePastTheEnd.getInt();
    521 }
    522 
    523 CharUnits &APValue::getLValueOffset() {
    524   assert(isLValue() && "Invalid accessor");
    525   return ((LV*)(void*)Data)->Offset;
    526 }
    527 
    528 bool APValue::hasLValuePath() const {
    529   assert(isLValue() && "Invalid accessor");
    530   return ((const LV*)(const char*)Data)->hasPath();
    531 }
    532 
    533 ArrayRef<APValue::LValuePathEntry> APValue::getLValuePath() const {
    534   assert(isLValue() && hasLValuePath() && "Invalid accessor");
    535   const LV &LVal = *((const LV*)(const char*)Data);
    536   return ArrayRef<LValuePathEntry>(LVal.getPath(), LVal.PathLength);
    537 }
    538 
    539 unsigned APValue::getLValueCallIndex() const {
    540   assert(isLValue() && "Invalid accessor");
    541   return ((const LV*)(const char*)Data)->CallIndex;
    542 }
    543 
    544 void APValue::setLValue(LValueBase B, const CharUnits &O, NoLValuePath,
    545                         unsigned CallIndex) {
    546   assert(isLValue() && "Invalid accessor");
    547   LV &LVal = *((LV*)(char*)Data);
    548   LVal.BaseAndIsOnePastTheEnd.setPointer(B);
    549   LVal.BaseAndIsOnePastTheEnd.setInt(false);
    550   LVal.Offset = O;
    551   LVal.CallIndex = CallIndex;
    552   LVal.resizePath((unsigned)-1);
    553 }
    554 
    555 void APValue::setLValue(LValueBase B, const CharUnits &O,
    556                         ArrayRef<LValuePathEntry> Path, bool IsOnePastTheEnd,
    557                         unsigned CallIndex) {
    558   assert(isLValue() && "Invalid accessor");
    559   LV &LVal = *((LV*)(char*)Data);
    560   LVal.BaseAndIsOnePastTheEnd.setPointer(B);
    561   LVal.BaseAndIsOnePastTheEnd.setInt(IsOnePastTheEnd);
    562   LVal.Offset = O;
    563   LVal.CallIndex = CallIndex;
    564   LVal.resizePath(Path.size());
    565   memcpy(LVal.getPath(), Path.data(), Path.size() * sizeof(LValuePathEntry));
    566 }
    567 
    568 const ValueDecl *APValue::getMemberPointerDecl() const {
    569   assert(isMemberPointer() && "Invalid accessor");
    570   const MemberPointerData &MPD = *((const MemberPointerData*)(const char*)Data);
    571   return MPD.MemberAndIsDerivedMember.getPointer();
    572 }
    573 
    574 bool APValue::isMemberPointerToDerivedMember() const {
    575   assert(isMemberPointer() && "Invalid accessor");
    576   const MemberPointerData &MPD = *((const MemberPointerData*)(const char*)Data);
    577   return MPD.MemberAndIsDerivedMember.getInt();
    578 }
    579 
    580 ArrayRef<const CXXRecordDecl*> APValue::getMemberPointerPath() const {
    581   assert(isMemberPointer() && "Invalid accessor");
    582   const MemberPointerData &MPD = *((const MemberPointerData*)(const char*)Data);
    583   return ArrayRef<const CXXRecordDecl*>(MPD.getPath(), MPD.PathLength);
    584 }
    585 
    586 void APValue::MakeLValue() {
    587   assert(isUninit() && "Bad state change");
    588   assert(sizeof(LV) <= MaxSize && "LV too big");
    589   new ((void*)(char*)Data) LV();
    590   Kind = LValue;
    591 }
    592 
    593 void APValue::MakeArray(unsigned InitElts, unsigned Size) {
    594   assert(isUninit() && "Bad state change");
    595   new ((void*)(char*)Data) Arr(InitElts, Size);
    596   Kind = Array;
    597 }
    598 
    599 void APValue::MakeMemberPointer(const ValueDecl *Member, bool IsDerivedMember,
    600                                 ArrayRef<const CXXRecordDecl*> Path) {
    601   assert(isUninit() && "Bad state change");
    602   MemberPointerData *MPD = new ((void*)(char*)Data) MemberPointerData;
    603   Kind = MemberPointer;
    604   MPD->MemberAndIsDerivedMember.setPointer(Member);
    605   MPD->MemberAndIsDerivedMember.setInt(IsDerivedMember);
    606   MPD->resizePath(Path.size());
    607   memcpy(MPD->getPath(), Path.data(), Path.size()*sizeof(const CXXRecordDecl*));
    608 }
    609