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Diffstat (limited to 'clang/lib/AST/APValue.cpp')
| -rw-r--r-- | clang/lib/AST/APValue.cpp | 607 |
1 files changed, 607 insertions, 0 deletions
diff --git a/clang/lib/AST/APValue.cpp b/clang/lib/AST/APValue.cpp new file mode 100644 index 0000000..a31b3c5 --- /dev/null +++ b/clang/lib/AST/APValue.cpp @@ -0,0 +1,607 @@ +//===--- APValue.cpp - Union class for APFloat/APSInt/Complex -------------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// 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 "clang/Basic/Diagnostic.h" +#include "llvm/ADT/SmallString.h" +#include "llvm/Support/raw_ostream.h" +#include "llvm/Support/ErrorHandling.h" +using namespace clang; + +namespace { + struct LVBase { + llvm::PointerIntPair<APValue::LValueBase, 1, bool> BaseAndIsOnePastTheEnd; + CharUnits Offset; + unsigned PathLength; + unsigned CallIndex; + }; +} + +struct APValue::LV : LVBase { + static const unsigned InlinePathSpace = + (MaxSize - 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 = + (MaxSize - 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(0), Value(new APValue) {} +APValue::UnionData::~UnionData () { + delete Value; +} + +APValue::APValue(const APValue &RHS) : Kind(Uninitialized) { + switch (RHS.getKind()) { + case Uninitialized: + break; + case Int: + MakeInt(); + setInt(RHS.getInt()); + break; + case Float: + MakeFloat(); + setFloat(RHS.getFloat()); + 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.getLValueCallIndex()); + else + setLValue(RHS.getLValueBase(), RHS.getLValueOffset(), NoLValuePath(), + RHS.getLValueCallIndex()); + 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)->~APSInt(); + else if (Kind == Float) + ((APFloat*)(char*)Data)->~APFloat(); + 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 = Uninitialized; +} + +void APValue::swap(APValue &RHS) { + std::swap(Kind, RHS.Kind); + char TmpData[MaxSize]; + memcpy(TmpData, Data, MaxSize); + memcpy(Data, RHS.Data, MaxSize); + memcpy(RHS.Data, TmpData, MaxSize); +} + +void APValue::dump() const { + dump(llvm::errs()); + llvm::errs() << '\n'; +} + +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::dump(raw_ostream &OS) const { + switch (getKind()) { + case Uninitialized: + OS << "Uninitialized"; + return; + case Int: + OS << "Int: " << getInt(); + return; + case Float: + OS << "Float: " << GetApproxValue(getFloat()); + return; + case Vector: + OS << "Vector: "; + getVectorElt(0).dump(OS); + for (unsigned i = 1; i != getVectorLength(); ++i) { + OS << ", "; + getVectorElt(i).dump(OS); + } + return; + case ComplexInt: + OS << "ComplexInt: " << getComplexIntReal() << ", " << getComplexIntImag(); + return; + case ComplexFloat: + OS << "ComplexFloat: " << GetApproxValue(getComplexFloatReal()) + << ", " << GetApproxValue(getComplexFloatImag()); + return; + case LValue: + OS << "LValue: <todo>"; + return; + case Array: + OS << "Array: "; + for (unsigned I = 0, N = getArrayInitializedElts(); I != N; ++I) { + getArrayInitializedElt(I).dump(OS); + if (I != getArraySize() - 1) OS << ", "; + } + if (hasArrayFiller()) { + OS << getArraySize() - getArrayInitializedElts() << " x "; + getArrayFiller().dump(OS); + } + return; + case Struct: + OS << "Struct "; + if (unsigned N = getStructNumBases()) { + OS << " bases: "; + getStructBase(0).dump(OS); + for (unsigned I = 1; I != N; ++I) { + OS << ", "; + getStructBase(I).dump(OS); + } + } + if (unsigned N = getStructNumFields()) { + OS << " fields: "; + getStructField(0).dump(OS); + for (unsigned I = 1; I != N; ++I) { + OS << ", "; + getStructField(I).dump(OS); + } + } + return; + case Union: + OS << "Union: "; + getUnionValue().dump(OS); + return; + case MemberPointer: + OS << "MemberPointer: <todo>"; + return; + case AddrLabelDiff: + OS << "AddrLabelDiff: <todo>"; + return; + } + llvm_unreachable("Unknown APValue kind!"); +} + +void APValue::printPretty(raw_ostream &Out, ASTContext &Ctx, QualType Ty) const{ + switch (getKind()) { + case APValue::Uninitialized: + 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::Vector: { + Out << '{'; + QualType ElemTy = Ty->getAs<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: { + LValueBase Base = getLValueBase(); + if (!Base) { + Out << "0"; + return; + } + + bool IsReference = Ty->isReferenceType(); + QualType InnerTy + = IsReference ? Ty.getNonReferenceType() : Ty->getPointeeType(); + + 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 + Base.get<const Expr*>()->printPretty(Out, Ctx, 0, + 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 { + const Expr *E = Base.get<const Expr*>(); + E->printPretty(Out, Ctx, 0,Ctx.getPrintingPolicy()); + ElemTy = E->getType(); + } + + ArrayRef<LValuePathEntry> Path = getLValuePath(); + const CXXRecordDecl *CastToBase = 0; + 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 = + BaseOrMemberType::getFromOpaqueValue(Path[I].BaseOrMember).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].ArrayIndex << ']'; + 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->getAs<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 (RecordDecl::field_iterator FI = RD->field_begin(); + FI != RD->field_end(); ++FI) { + 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(ASTContext &Ctx, QualType Ty) const { + std::string Result; + llvm::raw_string_ostream Out(Result); + printPretty(Out, Ctx, Ty); + Out.flush(); + return Result; +} + +const APValue::LValueBase APValue::getLValueBase() const { + assert(isLValue() && "Invalid accessor"); + return ((const LV*)(const void*)Data)->BaseAndIsOnePastTheEnd.getPointer(); +} + +bool APValue::isLValueOnePastTheEnd() const { + assert(isLValue() && "Invalid accessor"); + return ((const LV*)(const void*)Data)->BaseAndIsOnePastTheEnd.getInt(); +} + +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 ArrayRef<LValuePathEntry>(LVal.getPath(), LVal.PathLength); +} + +unsigned APValue::getLValueCallIndex() const { + assert(isLValue() && "Invalid accessor"); + return ((const LV*)(const char*)Data)->CallIndex; +} + +void APValue::setLValue(LValueBase B, const CharUnits &O, NoLValuePath, + unsigned CallIndex) { + assert(isLValue() && "Invalid accessor"); + LV &LVal = *((LV*)(char*)Data); + LVal.BaseAndIsOnePastTheEnd.setPointer(B); + LVal.BaseAndIsOnePastTheEnd.setInt(false); + LVal.Offset = O; + LVal.CallIndex = CallIndex; + LVal.resizePath((unsigned)-1); +} + +void APValue::setLValue(LValueBase B, const CharUnits &O, + ArrayRef<LValuePathEntry> Path, bool IsOnePastTheEnd, + unsigned CallIndex) { + assert(isLValue() && "Invalid accessor"); + LV &LVal = *((LV*)(char*)Data); + LVal.BaseAndIsOnePastTheEnd.setPointer(B); + LVal.BaseAndIsOnePastTheEnd.setInt(IsOnePastTheEnd); + LVal.Offset = O; + LVal.CallIndex = CallIndex; + LVal.resizePath(Path.size()); + memcpy(LVal.getPath(), Path.data(), Path.size() * sizeof(LValuePathEntry)); +} + +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 ArrayRef<const CXXRecordDecl*>(MPD.getPath(), MPD.PathLength); +} + +void APValue::MakeLValue() { + assert(isUninit() && "Bad state change"); + assert(sizeof(LV) <= MaxSize && "LV too big"); + new ((void*)(char*)Data) LV(); + Kind = LValue; +} + +void APValue::MakeArray(unsigned InitElts, unsigned Size) { + assert(isUninit() && "Bad state change"); + new ((void*)(char*)Data) Arr(InitElts, Size); + Kind = Array; +} + +void APValue::MakeMemberPointer(const ValueDecl *Member, bool IsDerivedMember, + ArrayRef<const CXXRecordDecl*> Path) { + assert(isUninit() && "Bad state change"); + MemberPointerData *MPD = new ((void*)(char*)Data) 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*)); +} |