1//===--- APValue.h - Union class for APFloat/APSInt/Complex -----*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9//  This file defines the APValue class.
10//
11//===----------------------------------------------------------------------===//
12
13#ifndef LLVM_CLANG_AST_APVALUE_H
14#define LLVM_CLANG_AST_APVALUE_H
15
16#include "clang/Basic/LLVM.h"
17#include "llvm/ADT/APFixedPoint.h"
18#include "llvm/ADT/APFloat.h"
19#include "llvm/ADT/APSInt.h"
20#include "llvm/ADT/FoldingSet.h"
21#include "llvm/ADT/PointerIntPair.h"
22#include "llvm/ADT/PointerUnion.h"
23#include "llvm/Support/AlignOf.h"
24
25namespace clang {
26namespace serialization {
27template <typename T> class BasicReaderBase;
28} // end namespace serialization
29
30  class AddrLabelExpr;
31  class ASTContext;
32  class CharUnits;
33  class CXXRecordDecl;
34  class Decl;
35  class DiagnosticBuilder;
36  class Expr;
37  class FieldDecl;
38  struct PrintingPolicy;
39  class Type;
40  class ValueDecl;
41  class QualType;
42
43/// Symbolic representation of typeid(T) for some type T.
44class TypeInfoLValue {
45  const Type *T;
46
47public:
48  TypeInfoLValue() : T() {}
49  explicit TypeInfoLValue(const Type *T);
50
51  const Type *getType() const { return T; }
52  explicit operator bool() const { return T; }
53
54  void *getOpaqueValue() { return const_cast<Type*>(T); }
55  static TypeInfoLValue getFromOpaqueValue(void *Value) {
56    TypeInfoLValue V;
57    V.T = reinterpret_cast<const Type*>(Value);
58    return V;
59  }
60
61  void print(llvm::raw_ostream &Out, const PrintingPolicy &Policy) const;
62};
63
64/// Symbolic representation of a dynamic allocation.
65class DynamicAllocLValue {
66  unsigned Index;
67
68public:
69  DynamicAllocLValue() : Index(0) {}
70  explicit DynamicAllocLValue(unsigned Index) : Index(Index + 1) {}
71  unsigned getIndex() { return Index - 1; }
72
73  explicit operator bool() const { return Index != 0; }
74
75  void *getOpaqueValue() {
76    return reinterpret_cast<void *>(static_cast<uintptr_t>(Index)
77                                    << NumLowBitsAvailable);
78  }
79  static DynamicAllocLValue getFromOpaqueValue(void *Value) {
80    DynamicAllocLValue V;
81    V.Index = reinterpret_cast<uintptr_t>(Value) >> NumLowBitsAvailable;
82    return V;
83  }
84
85  static unsigned getMaxIndex() {
86    return (std::numeric_limits<unsigned>::max() >> NumLowBitsAvailable) - 1;
87  }
88
89  static constexpr int NumLowBitsAvailable = 3;
90};
91}
92
93namespace llvm {
94template<> struct PointerLikeTypeTraits<clang::TypeInfoLValue> {
95  static void *getAsVoidPointer(clang::TypeInfoLValue V) {
96    return V.getOpaqueValue();
97  }
98  static clang::TypeInfoLValue getFromVoidPointer(void *P) {
99    return clang::TypeInfoLValue::getFromOpaqueValue(P);
100  }
101  // Validated by static_assert in APValue.cpp; hardcoded to avoid needing
102  // to include Type.h.
103  static constexpr int NumLowBitsAvailable = 3;
104};
105
106template<> struct PointerLikeTypeTraits<clang::DynamicAllocLValue> {
107  static void *getAsVoidPointer(clang::DynamicAllocLValue V) {
108    return V.getOpaqueValue();
109  }
110  static clang::DynamicAllocLValue getFromVoidPointer(void *P) {
111    return clang::DynamicAllocLValue::getFromOpaqueValue(P);
112  }
113  static constexpr int NumLowBitsAvailable =
114      clang::DynamicAllocLValue::NumLowBitsAvailable;
115};
116}
117
118namespace clang {
119/// APValue - This class implements a discriminated union of [uninitialized]
120/// [APSInt] [APFloat], [Complex APSInt] [Complex APFloat], [Expr + Offset],
121/// [Vector: N * APValue], [Array: N * APValue]
122class APValue {
123  typedef llvm::APFixedPoint APFixedPoint;
124  typedef llvm::APSInt APSInt;
125  typedef llvm::APFloat APFloat;
126public:
127  enum ValueKind {
128    /// There is no such object (it's outside its lifetime).
129    None,
130    /// This object has an indeterminate value (C++ [basic.indet]).
131    Indeterminate,
132    Int,
133    Float,
134    FixedPoint,
135    ComplexInt,
136    ComplexFloat,
137    LValue,
138    Vector,
139    Array,
140    Struct,
141    Union,
142    MemberPointer,
143    AddrLabelDiff
144  };
145
146  class LValueBase {
147    typedef llvm::PointerUnion<const ValueDecl *, const Expr *, TypeInfoLValue,
148                               DynamicAllocLValue>
149        PtrTy;
150
151  public:
152    LValueBase() : Local{} {}
153    LValueBase(const ValueDecl *P, unsigned I = 0, unsigned V = 0);
154    LValueBase(const Expr *P, unsigned I = 0, unsigned V = 0);
155    static LValueBase getDynamicAlloc(DynamicAllocLValue LV, QualType Type);
156    static LValueBase getTypeInfo(TypeInfoLValue LV, QualType TypeInfo);
157
158    void Profile(llvm::FoldingSetNodeID &ID) const;
159
160    template <class T>
161    bool is() const { return Ptr.is<T>(); }
162
163    template <class T>
164    T get() const { return Ptr.get<T>(); }
165
166    template <class T>
167    T dyn_cast() const { return Ptr.dyn_cast<T>(); }
168
169    void *getOpaqueValue() const;
170
171    bool isNull() const;
172
173    explicit operator bool() const;
174
175    unsigned getCallIndex() const;
176    unsigned getVersion() const;
177    QualType getTypeInfoType() const;
178    QualType getDynamicAllocType() const;
179
180    QualType getType() const;
181
182    friend bool operator==(const LValueBase &LHS, const LValueBase &RHS);
183    friend bool operator!=(const LValueBase &LHS, const LValueBase &RHS) {
184      return !(LHS == RHS);
185    }
186    friend llvm::hash_code hash_value(const LValueBase &Base);
187    friend struct llvm::DenseMapInfo<LValueBase>;
188
189  private:
190    PtrTy Ptr;
191    struct LocalState {
192      unsigned CallIndex, Version;
193    };
194    union {
195      LocalState Local;
196      /// The type std::type_info, if this is a TypeInfoLValue.
197      void *TypeInfoType;
198      /// The QualType, if this is a DynamicAllocLValue.
199      void *DynamicAllocType;
200    };
201  };
202
203  /// A FieldDecl or CXXRecordDecl, along with a flag indicating whether we
204  /// mean a virtual or non-virtual base class subobject.
205  typedef llvm::PointerIntPair<const Decl *, 1, bool> BaseOrMemberType;
206
207  /// A non-discriminated union of a base, field, or array index.
208  class LValuePathEntry {
209    static_assert(sizeof(uintptr_t) <= sizeof(uint64_t),
210                  "pointer doesn't fit in 64 bits?");
211    uint64_t Value;
212
213  public:
214    LValuePathEntry() : Value() {}
215    LValuePathEntry(BaseOrMemberType BaseOrMember);
216    static LValuePathEntry ArrayIndex(uint64_t Index) {
217      LValuePathEntry Result;
218      Result.Value = Index;
219      return Result;
220    }
221
222    BaseOrMemberType getAsBaseOrMember() const {
223      return BaseOrMemberType::getFromOpaqueValue(
224          reinterpret_cast<void *>(Value));
225    }
226    uint64_t getAsArrayIndex() const { return Value; }
227
228    void Profile(llvm::FoldingSetNodeID &ID) const;
229
230    friend bool operator==(LValuePathEntry A, LValuePathEntry B) {
231      return A.Value == B.Value;
232    }
233    friend bool operator!=(LValuePathEntry A, LValuePathEntry B) {
234      return A.Value != B.Value;
235    }
236    friend llvm::hash_code hash_value(LValuePathEntry A) {
237      return llvm::hash_value(A.Value);
238    }
239  };
240  class LValuePathSerializationHelper {
241    const void *ElemTy;
242
243  public:
244    ArrayRef<LValuePathEntry> Path;
245
246    LValuePathSerializationHelper(ArrayRef<LValuePathEntry>, QualType);
247    QualType getType();
248  };
249  struct NoLValuePath {};
250  struct UninitArray {};
251  struct UninitStruct {};
252
253  template <typename Impl> friend class clang::serialization::BasicReaderBase;
254  friend class ASTImporter;
255  friend class ASTNodeImporter;
256
257private:
258  ValueKind Kind;
259
260  struct ComplexAPSInt {
261    APSInt Real, Imag;
262    ComplexAPSInt() : Real(1), Imag(1) {}
263  };
264  struct ComplexAPFloat {
265    APFloat Real, Imag;
266    ComplexAPFloat() : Real(0.0), Imag(0.0) {}
267  };
268  struct LV;
269  struct Vec {
270    APValue *Elts;
271    unsigned NumElts;
272    Vec() : Elts(nullptr), NumElts(0) {}
273    ~Vec() { delete[] Elts; }
274  };
275  struct Arr {
276    APValue *Elts;
277    unsigned NumElts, ArrSize;
278    Arr(unsigned NumElts, unsigned ArrSize);
279    ~Arr();
280  };
281  struct StructData {
282    APValue *Elts;
283    unsigned NumBases;
284    unsigned NumFields;
285    StructData(unsigned NumBases, unsigned NumFields);
286    ~StructData();
287  };
288  struct UnionData {
289    const FieldDecl *Field;
290    APValue *Value;
291    UnionData();
292    ~UnionData();
293  };
294  struct AddrLabelDiffData {
295    const AddrLabelExpr* LHSExpr;
296    const AddrLabelExpr* RHSExpr;
297  };
298  struct MemberPointerData;
299
300  // We ensure elsewhere that Data is big enough for LV and MemberPointerData.
301  typedef llvm::AlignedCharArrayUnion<void *, APSInt, APFloat, ComplexAPSInt,
302                                      ComplexAPFloat, Vec, Arr, StructData,
303                                      UnionData, AddrLabelDiffData> DataType;
304  static const size_t DataSize = sizeof(DataType);
305
306  DataType Data;
307
308public:
309  APValue() : Kind(None) {}
310  explicit APValue(APSInt I) : Kind(None) {
311    MakeInt(); setInt(std::move(I));
312  }
313  explicit APValue(APFloat F) : Kind(None) {
314    MakeFloat(); setFloat(std::move(F));
315  }
316  explicit APValue(APFixedPoint FX) : Kind(None) {
317    MakeFixedPoint(std::move(FX));
318  }
319  explicit APValue(const APValue *E, unsigned N) : Kind(None) {
320    MakeVector(); setVector(E, N);
321  }
322  APValue(APSInt R, APSInt I) : Kind(None) {
323    MakeComplexInt(); setComplexInt(std::move(R), std::move(I));
324  }
325  APValue(APFloat R, APFloat I) : Kind(None) {
326    MakeComplexFloat(); setComplexFloat(std::move(R), std::move(I));
327  }
328  APValue(const APValue &RHS);
329  APValue(APValue &&RHS);
330  APValue(LValueBase B, const CharUnits &O, NoLValuePath N,
331          bool IsNullPtr = false)
332      : Kind(None) {
333    MakeLValue(); setLValue(B, O, N, IsNullPtr);
334  }
335  APValue(LValueBase B, const CharUnits &O, ArrayRef<LValuePathEntry> Path,
336          bool OnePastTheEnd, bool IsNullPtr = false)
337      : Kind(None) {
338    MakeLValue(); setLValue(B, O, Path, OnePastTheEnd, IsNullPtr);
339  }
340  APValue(UninitArray, unsigned InitElts, unsigned Size) : Kind(None) {
341    MakeArray(InitElts, Size);
342  }
343  APValue(UninitStruct, unsigned B, unsigned M) : Kind(None) {
344    MakeStruct(B, M);
345  }
346  explicit APValue(const FieldDecl *D, const APValue &V = APValue())
347      : Kind(None) {
348    MakeUnion(); setUnion(D, V);
349  }
350  APValue(const ValueDecl *Member, bool IsDerivedMember,
351          ArrayRef<const CXXRecordDecl*> Path) : Kind(None) {
352    MakeMemberPointer(Member, IsDerivedMember, Path);
353  }
354  APValue(const AddrLabelExpr* LHSExpr, const AddrLabelExpr* RHSExpr)
355      : Kind(None) {
356    MakeAddrLabelDiff(); setAddrLabelDiff(LHSExpr, RHSExpr);
357  }
358  static APValue IndeterminateValue() {
359    APValue Result;
360    Result.Kind = Indeterminate;
361    return Result;
362  }
363
364  APValue &operator=(const APValue &RHS);
365  APValue &operator=(APValue &&RHS);
366
367  ~APValue() {
368    if (Kind != None && Kind != Indeterminate)
369      DestroyDataAndMakeUninit();
370  }
371
372  /// Returns whether the object performed allocations.
373  ///
374  /// If APValues are constructed via placement new, \c needsCleanup()
375  /// indicates whether the destructor must be called in order to correctly
376  /// free all allocated memory.
377  bool needsCleanup() const;
378
379  /// Swaps the contents of this and the given APValue.
380  void swap(APValue &RHS);
381
382  /// profile this value. There is no guarantee that values of different
383  /// types will not produce the same profiled value, so the type should
384  /// typically also be profiled if it's not implied by the context.
385  void Profile(llvm::FoldingSetNodeID &ID) const;
386
387  ValueKind getKind() const { return Kind; }
388
389  bool isAbsent() const { return Kind == None; }
390  bool isIndeterminate() const { return Kind == Indeterminate; }
391  bool hasValue() const { return Kind != None && Kind != Indeterminate; }
392
393  bool isInt() const { return Kind == Int; }
394  bool isFloat() const { return Kind == Float; }
395  bool isFixedPoint() const { return Kind == FixedPoint; }
396  bool isComplexInt() const { return Kind == ComplexInt; }
397  bool isComplexFloat() const { return Kind == ComplexFloat; }
398  bool isLValue() const { return Kind == LValue; }
399  bool isVector() const { return Kind == Vector; }
400  bool isArray() const { return Kind == Array; }
401  bool isStruct() const { return Kind == Struct; }
402  bool isUnion() const { return Kind == Union; }
403  bool isMemberPointer() const { return Kind == MemberPointer; }
404  bool isAddrLabelDiff() const { return Kind == AddrLabelDiff; }
405
406  void dump() const;
407  void dump(raw_ostream &OS, const ASTContext &Context) const;
408
409  void printPretty(raw_ostream &OS, const ASTContext &Ctx, QualType Ty) const;
410  void printPretty(raw_ostream &OS, const PrintingPolicy &Policy, QualType Ty,
411                   const ASTContext *Ctx = nullptr) const;
412
413  std::string getAsString(const ASTContext &Ctx, QualType Ty) const;
414
415  APSInt &getInt() {
416    assert(isInt() && "Invalid accessor");
417    return *(APSInt *)(char *)&Data;
418  }
419  const APSInt &getInt() const {
420    return const_cast<APValue*>(this)->getInt();
421  }
422
423  /// Try to convert this value to an integral constant. This works if it's an
424  /// integer, null pointer, or offset from a null pointer. Returns true on
425  /// success.
426  bool toIntegralConstant(APSInt &Result, QualType SrcTy,
427                          const ASTContext &Ctx) const;
428
429  APFloat &getFloat() {
430    assert(isFloat() && "Invalid accessor");
431    return *(APFloat *)(char *)&Data;
432  }
433  const APFloat &getFloat() const {
434    return const_cast<APValue*>(this)->getFloat();
435  }
436
437  APFixedPoint &getFixedPoint() {
438    assert(isFixedPoint() && "Invalid accessor");
439    return *(APFixedPoint *)(char *)&Data;
440  }
441  const APFixedPoint &getFixedPoint() const {
442    return const_cast<APValue *>(this)->getFixedPoint();
443  }
444
445  APSInt &getComplexIntReal() {
446    assert(isComplexInt() && "Invalid accessor");
447    return ((ComplexAPSInt *)(char *)&Data)->Real;
448  }
449  const APSInt &getComplexIntReal() const {
450    return const_cast<APValue*>(this)->getComplexIntReal();
451  }
452
453  APSInt &getComplexIntImag() {
454    assert(isComplexInt() && "Invalid accessor");
455    return ((ComplexAPSInt *)(char *)&Data)->Imag;
456  }
457  const APSInt &getComplexIntImag() const {
458    return const_cast<APValue*>(this)->getComplexIntImag();
459  }
460
461  APFloat &getComplexFloatReal() {
462    assert(isComplexFloat() && "Invalid accessor");
463    return ((ComplexAPFloat *)(char *)&Data)->Real;
464  }
465  const APFloat &getComplexFloatReal() const {
466    return const_cast<APValue*>(this)->getComplexFloatReal();
467  }
468
469  APFloat &getComplexFloatImag() {
470    assert(isComplexFloat() && "Invalid accessor");
471    return ((ComplexAPFloat *)(char *)&Data)->Imag;
472  }
473  const APFloat &getComplexFloatImag() const {
474    return const_cast<APValue*>(this)->getComplexFloatImag();
475  }
476
477  const LValueBase getLValueBase() const;
478  CharUnits &getLValueOffset();
479  const CharUnits &getLValueOffset() const {
480    return const_cast<APValue*>(this)->getLValueOffset();
481  }
482  bool isLValueOnePastTheEnd() const;
483  bool hasLValuePath() const;
484  ArrayRef<LValuePathEntry> getLValuePath() const;
485  unsigned getLValueCallIndex() const;
486  unsigned getLValueVersion() const;
487  bool isNullPointer() const;
488
489  APValue &getVectorElt(unsigned I) {
490    assert(isVector() && "Invalid accessor");
491    assert(I < getVectorLength() && "Index out of range");
492    return ((Vec *)(char *)&Data)->Elts[I];
493  }
494  const APValue &getVectorElt(unsigned I) const {
495    return const_cast<APValue*>(this)->getVectorElt(I);
496  }
497  unsigned getVectorLength() const {
498    assert(isVector() && "Invalid accessor");
499    return ((const Vec *)(const void *)&Data)->NumElts;
500  }
501
502  APValue &getArrayInitializedElt(unsigned I) {
503    assert(isArray() && "Invalid accessor");
504    assert(I < getArrayInitializedElts() && "Index out of range");
505    return ((Arr *)(char *)&Data)->Elts[I];
506  }
507  const APValue &getArrayInitializedElt(unsigned I) const {
508    return const_cast<APValue*>(this)->getArrayInitializedElt(I);
509  }
510  bool hasArrayFiller() const {
511    return getArrayInitializedElts() != getArraySize();
512  }
513  APValue &getArrayFiller() {
514    assert(isArray() && "Invalid accessor");
515    assert(hasArrayFiller() && "No array filler");
516    return ((Arr *)(char *)&Data)->Elts[getArrayInitializedElts()];
517  }
518  const APValue &getArrayFiller() const {
519    return const_cast<APValue*>(this)->getArrayFiller();
520  }
521  unsigned getArrayInitializedElts() const {
522    assert(isArray() && "Invalid accessor");
523    return ((const Arr *)(const void *)&Data)->NumElts;
524  }
525  unsigned getArraySize() const {
526    assert(isArray() && "Invalid accessor");
527    return ((const Arr *)(const void *)&Data)->ArrSize;
528  }
529
530  unsigned getStructNumBases() const {
531    assert(isStruct() && "Invalid accessor");
532    return ((const StructData *)(const char *)&Data)->NumBases;
533  }
534  unsigned getStructNumFields() const {
535    assert(isStruct() && "Invalid accessor");
536    return ((const StructData *)(const char *)&Data)->NumFields;
537  }
538  APValue &getStructBase(unsigned i) {
539    assert(isStruct() && "Invalid accessor");
540    assert(i < getStructNumBases() && "base class index OOB");
541    return ((StructData *)(char *)&Data)->Elts[i];
542  }
543  APValue &getStructField(unsigned i) {
544    assert(isStruct() && "Invalid accessor");
545    assert(i < getStructNumFields() && "field index OOB");
546    return ((StructData *)(char *)&Data)->Elts[getStructNumBases() + i];
547  }
548  const APValue &getStructBase(unsigned i) const {
549    return const_cast<APValue*>(this)->getStructBase(i);
550  }
551  const APValue &getStructField(unsigned i) const {
552    return const_cast<APValue*>(this)->getStructField(i);
553  }
554
555  const FieldDecl *getUnionField() const {
556    assert(isUnion() && "Invalid accessor");
557    return ((const UnionData *)(const char *)&Data)->Field;
558  }
559  APValue &getUnionValue() {
560    assert(isUnion() && "Invalid accessor");
561    return *((UnionData *)(char *)&Data)->Value;
562  }
563  const APValue &getUnionValue() const {
564    return const_cast<APValue*>(this)->getUnionValue();
565  }
566
567  const ValueDecl *getMemberPointerDecl() const;
568  bool isMemberPointerToDerivedMember() const;
569  ArrayRef<const CXXRecordDecl*> getMemberPointerPath() const;
570
571  const AddrLabelExpr* getAddrLabelDiffLHS() const {
572    assert(isAddrLabelDiff() && "Invalid accessor");
573    return ((const AddrLabelDiffData *)(const char *)&Data)->LHSExpr;
574  }
575  const AddrLabelExpr* getAddrLabelDiffRHS() const {
576    assert(isAddrLabelDiff() && "Invalid accessor");
577    return ((const AddrLabelDiffData *)(const char *)&Data)->RHSExpr;
578  }
579
580  void setInt(APSInt I) {
581    assert(isInt() && "Invalid accessor");
582    *(APSInt *)(char *)&Data = std::move(I);
583  }
584  void setFloat(APFloat F) {
585    assert(isFloat() && "Invalid accessor");
586    *(APFloat *)(char *)&Data = std::move(F);
587  }
588  void setFixedPoint(APFixedPoint FX) {
589    assert(isFixedPoint() && "Invalid accessor");
590    *(APFixedPoint *)(char *)&Data = std::move(FX);
591  }
592  void setVector(const APValue *E, unsigned N) {
593    MutableArrayRef<APValue> InternalElts = setVectorUninit(N);
594    for (unsigned i = 0; i != N; ++i)
595      InternalElts[i] = E[i];
596  }
597  void setComplexInt(APSInt R, APSInt I) {
598    assert(R.getBitWidth() == I.getBitWidth() &&
599           "Invalid complex int (type mismatch).");
600    assert(isComplexInt() && "Invalid accessor");
601    ((ComplexAPSInt *)(char *)&Data)->Real = std::move(R);
602    ((ComplexAPSInt *)(char *)&Data)->Imag = std::move(I);
603  }
604  void setComplexFloat(APFloat R, APFloat I) {
605    assert(&R.getSemantics() == &I.getSemantics() &&
606           "Invalid complex float (type mismatch).");
607    assert(isComplexFloat() && "Invalid accessor");
608    ((ComplexAPFloat *)(char *)&Data)->Real = std::move(R);
609    ((ComplexAPFloat *)(char *)&Data)->Imag = std::move(I);
610  }
611  void setLValue(LValueBase B, const CharUnits &O, NoLValuePath,
612                 bool IsNullPtr);
613  void setLValue(LValueBase B, const CharUnits &O,
614                 ArrayRef<LValuePathEntry> Path, bool OnePastTheEnd,
615                 bool IsNullPtr);
616  void setUnion(const FieldDecl *Field, const APValue &Value);
617  void setAddrLabelDiff(const AddrLabelExpr* LHSExpr,
618                        const AddrLabelExpr* RHSExpr) {
619    ((AddrLabelDiffData *)(char *)&Data)->LHSExpr = LHSExpr;
620    ((AddrLabelDiffData *)(char *)&Data)->RHSExpr = RHSExpr;
621  }
622
623private:
624  void DestroyDataAndMakeUninit();
625  void MakeInt() {
626    assert(isAbsent() && "Bad state change");
627    new ((void *)&Data) APSInt(1);
628    Kind = Int;
629  }
630  void MakeFloat() {
631    assert(isAbsent() && "Bad state change");
632    new ((void *)(char *)&Data) APFloat(0.0);
633    Kind = Float;
634  }
635  void MakeFixedPoint(APFixedPoint &&FX) {
636    assert(isAbsent() && "Bad state change");
637    new ((void *)(char *)&Data) APFixedPoint(std::move(FX));
638    Kind = FixedPoint;
639  }
640  void MakeVector() {
641    assert(isAbsent() && "Bad state change");
642    new ((void *)(char *)&Data) Vec();
643    Kind = Vector;
644  }
645  void MakeComplexInt() {
646    assert(isAbsent() && "Bad state change");
647    new ((void *)(char *)&Data) ComplexAPSInt();
648    Kind = ComplexInt;
649  }
650  void MakeComplexFloat() {
651    assert(isAbsent() && "Bad state change");
652    new ((void *)(char *)&Data) ComplexAPFloat();
653    Kind = ComplexFloat;
654  }
655  void MakeLValue();
656  void MakeArray(unsigned InitElts, unsigned Size);
657  void MakeStruct(unsigned B, unsigned M) {
658    assert(isAbsent() && "Bad state change");
659    new ((void *)(char *)&Data) StructData(B, M);
660    Kind = Struct;
661  }
662  void MakeUnion() {
663    assert(isAbsent() && "Bad state change");
664    new ((void *)(char *)&Data) UnionData();
665    Kind = Union;
666  }
667  void MakeMemberPointer(const ValueDecl *Member, bool IsDerivedMember,
668                         ArrayRef<const CXXRecordDecl*> Path);
669  void MakeAddrLabelDiff() {
670    assert(isAbsent() && "Bad state change");
671    new ((void *)(char *)&Data) AddrLabelDiffData();
672    Kind = AddrLabelDiff;
673  }
674
675private:
676  /// The following functions are used as part of initialization, during
677  /// deserialization and importing. Reserve the space so that it can be
678  /// filled in by those steps.
679  MutableArrayRef<APValue> setVectorUninit(unsigned N) {
680    assert(isVector() && "Invalid accessor");
681    Vec *V = ((Vec *)(char *)&Data);
682    V->Elts = new APValue[N];
683    V->NumElts = N;
684    return {V->Elts, V->NumElts};
685  }
686  MutableArrayRef<LValuePathEntry>
687  setLValueUninit(LValueBase B, const CharUnits &O, unsigned Size,
688                  bool OnePastTheEnd, bool IsNullPtr);
689  MutableArrayRef<const CXXRecordDecl *>
690  setMemberPointerUninit(const ValueDecl *Member, bool IsDerivedMember,
691                         unsigned Size);
692};
693
694} // end namespace clang.
695
696namespace llvm {
697template<> struct DenseMapInfo<clang::APValue::LValueBase> {
698  static clang::APValue::LValueBase getEmptyKey();
699  static clang::APValue::LValueBase getTombstoneKey();
700  static unsigned getHashValue(const clang::APValue::LValueBase &Base);
701  static bool isEqual(const clang::APValue::LValueBase &LHS,
702                      const clang::APValue::LValueBase &RHS);
703};
704}
705
706#endif
707