1 //===--- APValue.h - Union class for APFloat/APSInt/Complex -----*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines the APValue class.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_CLANG_AST_APVALUE_H
15 #define LLVM_CLANG_AST_APVALUE_H
17 #include "clang/Basic/LLVM.h"
18 #include "llvm/ADT/APFloat.h"
19 #include "llvm/ADT/APSInt.h"
20 #include "llvm/ADT/PointerIntPair.h"
21 #include "llvm/ADT/PointerUnion.h"
27 class DiagnosticBuilder;
35 /// APValue - This class implements a discriminated union of [uninitialized]
36 /// [APSInt] [APFloat], [Complex APSInt] [Complex APFloat], [Expr + Offset],
37 /// [Vector: N * APValue], [Array: N * APValue]
39 typedef llvm::APSInt APSInt;
40 typedef llvm::APFloat APFloat;
59 typedef llvm::PointerUnion<const ValueDecl *, const Expr *> PtrTy;
61 LValueBase() : CallIndex(0), Version(0) {}
64 LValueBase(T P, unsigned I = 0, unsigned V = 0)
65 : Ptr(P), CallIndex(I), Version(V) {}
68 bool is() const { return Ptr.is<T>(); }
71 T get() const { return Ptr.get<T>(); }
74 T dyn_cast() const { return Ptr.dyn_cast<T>(); }
76 void *getOpaqueValue() const;
80 explicit operator bool () const;
82 PtrTy getPointer() const {
86 unsigned getCallIndex() const {
90 void setCallIndex(unsigned Index) {
94 unsigned getVersion() const {
98 bool operator==(const LValueBase &Other) const {
99 return Ptr == Other.Ptr && CallIndex == Other.CallIndex &&
100 Version == Other.Version;
105 unsigned CallIndex, Version;
108 typedef llvm::PointerIntPair<const Decl *, 1, bool> BaseOrMemberType;
109 union LValuePathEntry {
110 /// BaseOrMember - The FieldDecl or CXXRecordDecl indicating the next item
111 /// in the path. An opaque value of type BaseOrMemberType.
113 /// ArrayIndex - The array index of the next item in the path.
116 struct NoLValuePath {};
117 struct UninitArray {};
118 struct UninitStruct {};
122 struct ComplexAPSInt {
124 ComplexAPSInt() : Real(1), Imag(1) {}
126 struct ComplexAPFloat {
128 ComplexAPFloat() : Real(0.0), Imag(0.0) {}
134 Vec() : Elts(nullptr), NumElts(0) {}
135 ~Vec() { delete[] Elts; }
139 unsigned NumElts, ArrSize;
140 Arr(unsigned NumElts, unsigned ArrSize);
147 StructData(unsigned NumBases, unsigned NumFields);
151 const FieldDecl *Field;
156 struct AddrLabelDiffData {
157 const AddrLabelExpr* LHSExpr;
158 const AddrLabelExpr* RHSExpr;
160 struct MemberPointerData;
162 // We ensure elsewhere that Data is big enough for LV and MemberPointerData.
163 typedef llvm::AlignedCharArrayUnion<void *, APSInt, APFloat, ComplexAPSInt,
164 ComplexAPFloat, Vec, Arr, StructData,
165 UnionData, AddrLabelDiffData> DataType;
166 static const size_t DataSize = sizeof(DataType);
171 APValue() : Kind(Uninitialized) {}
172 explicit APValue(APSInt I) : Kind(Uninitialized) {
173 MakeInt(); setInt(std::move(I));
175 explicit APValue(APFloat F) : Kind(Uninitialized) {
176 MakeFloat(); setFloat(std::move(F));
178 explicit APValue(const APValue *E, unsigned N) : Kind(Uninitialized) {
179 MakeVector(); setVector(E, N);
181 APValue(APSInt R, APSInt I) : Kind(Uninitialized) {
182 MakeComplexInt(); setComplexInt(std::move(R), std::move(I));
184 APValue(APFloat R, APFloat I) : Kind(Uninitialized) {
185 MakeComplexFloat(); setComplexFloat(std::move(R), std::move(I));
187 APValue(const APValue &RHS);
188 APValue(APValue &&RHS) : Kind(Uninitialized) { swap(RHS); }
189 APValue(LValueBase B, const CharUnits &O, NoLValuePath N,
190 bool IsNullPtr = false)
191 : Kind(Uninitialized) {
192 MakeLValue(); setLValue(B, O, N, IsNullPtr);
194 APValue(LValueBase B, const CharUnits &O, ArrayRef<LValuePathEntry> Path,
195 bool OnePastTheEnd, bool IsNullPtr = false)
196 : Kind(Uninitialized) {
197 MakeLValue(); setLValue(B, O, Path, OnePastTheEnd, IsNullPtr);
199 APValue(UninitArray, unsigned InitElts, unsigned Size) : Kind(Uninitialized) {
200 MakeArray(InitElts, Size);
202 APValue(UninitStruct, unsigned B, unsigned M) : Kind(Uninitialized) {
205 explicit APValue(const FieldDecl *D, const APValue &V = APValue())
206 : Kind(Uninitialized) {
207 MakeUnion(); setUnion(D, V);
209 APValue(const ValueDecl *Member, bool IsDerivedMember,
210 ArrayRef<const CXXRecordDecl*> Path) : Kind(Uninitialized) {
211 MakeMemberPointer(Member, IsDerivedMember, Path);
213 APValue(const AddrLabelExpr* LHSExpr, const AddrLabelExpr* RHSExpr)
214 : Kind(Uninitialized) {
215 MakeAddrLabelDiff(); setAddrLabelDiff(LHSExpr, RHSExpr);
222 /// Returns whether the object performed allocations.
224 /// If APValues are constructed via placement new, \c needsCleanup()
225 /// indicates whether the destructor must be called in order to correctly
226 /// free all allocated memory.
227 bool needsCleanup() const;
229 /// Swaps the contents of this and the given APValue.
230 void swap(APValue &RHS);
232 ValueKind getKind() const { return Kind; }
233 bool isUninit() const { return Kind == Uninitialized; }
234 bool isInt() const { return Kind == Int; }
235 bool isFloat() const { return Kind == Float; }
236 bool isComplexInt() const { return Kind == ComplexInt; }
237 bool isComplexFloat() const { return Kind == ComplexFloat; }
238 bool isLValue() const { return Kind == LValue; }
239 bool isVector() const { return Kind == Vector; }
240 bool isArray() const { return Kind == Array; }
241 bool isStruct() const { return Kind == Struct; }
242 bool isUnion() const { return Kind == Union; }
243 bool isMemberPointer() const { return Kind == MemberPointer; }
244 bool isAddrLabelDiff() const { return Kind == AddrLabelDiff; }
247 void dump(raw_ostream &OS) const;
249 void printPretty(raw_ostream &OS, ASTContext &Ctx, QualType Ty) const;
250 std::string getAsString(ASTContext &Ctx, QualType Ty) const;
253 assert(isInt() && "Invalid accessor");
254 return *(APSInt*)(char*)Data.buffer;
256 const APSInt &getInt() const {
257 return const_cast<APValue*>(this)->getInt();
260 APFloat &getFloat() {
261 assert(isFloat() && "Invalid accessor");
262 return *(APFloat*)(char*)Data.buffer;
264 const APFloat &getFloat() const {
265 return const_cast<APValue*>(this)->getFloat();
268 APSInt &getComplexIntReal() {
269 assert(isComplexInt() && "Invalid accessor");
270 return ((ComplexAPSInt*)(char*)Data.buffer)->Real;
272 const APSInt &getComplexIntReal() const {
273 return const_cast<APValue*>(this)->getComplexIntReal();
276 APSInt &getComplexIntImag() {
277 assert(isComplexInt() && "Invalid accessor");
278 return ((ComplexAPSInt*)(char*)Data.buffer)->Imag;
280 const APSInt &getComplexIntImag() const {
281 return const_cast<APValue*>(this)->getComplexIntImag();
284 APFloat &getComplexFloatReal() {
285 assert(isComplexFloat() && "Invalid accessor");
286 return ((ComplexAPFloat*)(char*)Data.buffer)->Real;
288 const APFloat &getComplexFloatReal() const {
289 return const_cast<APValue*>(this)->getComplexFloatReal();
292 APFloat &getComplexFloatImag() {
293 assert(isComplexFloat() && "Invalid accessor");
294 return ((ComplexAPFloat*)(char*)Data.buffer)->Imag;
296 const APFloat &getComplexFloatImag() const {
297 return const_cast<APValue*>(this)->getComplexFloatImag();
300 const LValueBase getLValueBase() const;
301 CharUnits &getLValueOffset();
302 const CharUnits &getLValueOffset() const {
303 return const_cast<APValue*>(this)->getLValueOffset();
305 bool isLValueOnePastTheEnd() const;
306 bool hasLValuePath() const;
307 ArrayRef<LValuePathEntry> getLValuePath() const;
308 unsigned getLValueCallIndex() const;
309 unsigned getLValueVersion() const;
310 bool isNullPointer() const;
312 APValue &getVectorElt(unsigned I) {
313 assert(isVector() && "Invalid accessor");
314 assert(I < getVectorLength() && "Index out of range");
315 return ((Vec*)(char*)Data.buffer)->Elts[I];
317 const APValue &getVectorElt(unsigned I) const {
318 return const_cast<APValue*>(this)->getVectorElt(I);
320 unsigned getVectorLength() const {
321 assert(isVector() && "Invalid accessor");
322 return ((const Vec*)(const void *)Data.buffer)->NumElts;
325 APValue &getArrayInitializedElt(unsigned I) {
326 assert(isArray() && "Invalid accessor");
327 assert(I < getArrayInitializedElts() && "Index out of range");
328 return ((Arr*)(char*)Data.buffer)->Elts[I];
330 const APValue &getArrayInitializedElt(unsigned I) const {
331 return const_cast<APValue*>(this)->getArrayInitializedElt(I);
333 bool hasArrayFiller() const {
334 return getArrayInitializedElts() != getArraySize();
336 APValue &getArrayFiller() {
337 assert(isArray() && "Invalid accessor");
338 assert(hasArrayFiller() && "No array filler");
339 return ((Arr*)(char*)Data.buffer)->Elts[getArrayInitializedElts()];
341 const APValue &getArrayFiller() const {
342 return const_cast<APValue*>(this)->getArrayFiller();
344 unsigned getArrayInitializedElts() const {
345 assert(isArray() && "Invalid accessor");
346 return ((const Arr*)(const void *)Data.buffer)->NumElts;
348 unsigned getArraySize() const {
349 assert(isArray() && "Invalid accessor");
350 return ((const Arr*)(const void *)Data.buffer)->ArrSize;
353 unsigned getStructNumBases() const {
354 assert(isStruct() && "Invalid accessor");
355 return ((const StructData*)(const char*)Data.buffer)->NumBases;
357 unsigned getStructNumFields() const {
358 assert(isStruct() && "Invalid accessor");
359 return ((const StructData*)(const char*)Data.buffer)->NumFields;
361 APValue &getStructBase(unsigned i) {
362 assert(isStruct() && "Invalid accessor");
363 return ((StructData*)(char*)Data.buffer)->Elts[i];
365 APValue &getStructField(unsigned i) {
366 assert(isStruct() && "Invalid accessor");
367 return ((StructData*)(char*)Data.buffer)->Elts[getStructNumBases() + i];
369 const APValue &getStructBase(unsigned i) const {
370 return const_cast<APValue*>(this)->getStructBase(i);
372 const APValue &getStructField(unsigned i) const {
373 return const_cast<APValue*>(this)->getStructField(i);
376 const FieldDecl *getUnionField() const {
377 assert(isUnion() && "Invalid accessor");
378 return ((const UnionData*)(const char*)Data.buffer)->Field;
380 APValue &getUnionValue() {
381 assert(isUnion() && "Invalid accessor");
382 return *((UnionData*)(char*)Data.buffer)->Value;
384 const APValue &getUnionValue() const {
385 return const_cast<APValue*>(this)->getUnionValue();
388 const ValueDecl *getMemberPointerDecl() const;
389 bool isMemberPointerToDerivedMember() const;
390 ArrayRef<const CXXRecordDecl*> getMemberPointerPath() const;
392 const AddrLabelExpr* getAddrLabelDiffLHS() const {
393 assert(isAddrLabelDiff() && "Invalid accessor");
394 return ((const AddrLabelDiffData*)(const char*)Data.buffer)->LHSExpr;
396 const AddrLabelExpr* getAddrLabelDiffRHS() const {
397 assert(isAddrLabelDiff() && "Invalid accessor");
398 return ((const AddrLabelDiffData*)(const char*)Data.buffer)->RHSExpr;
401 void setInt(APSInt I) {
402 assert(isInt() && "Invalid accessor");
403 *(APSInt *)(char *)Data.buffer = std::move(I);
405 void setFloat(APFloat F) {
406 assert(isFloat() && "Invalid accessor");
407 *(APFloat *)(char *)Data.buffer = std::move(F);
409 void setVector(const APValue *E, unsigned N) {
410 assert(isVector() && "Invalid accessor");
411 ((Vec*)(char*)Data.buffer)->Elts = new APValue[N];
412 ((Vec*)(char*)Data.buffer)->NumElts = N;
413 for (unsigned i = 0; i != N; ++i)
414 ((Vec*)(char*)Data.buffer)->Elts[i] = E[i];
416 void setComplexInt(APSInt R, APSInt I) {
417 assert(R.getBitWidth() == I.getBitWidth() &&
418 "Invalid complex int (type mismatch).");
419 assert(isComplexInt() && "Invalid accessor");
420 ((ComplexAPSInt *)(char *)Data.buffer)->Real = std::move(R);
421 ((ComplexAPSInt *)(char *)Data.buffer)->Imag = std::move(I);
423 void setComplexFloat(APFloat R, APFloat I) {
424 assert(&R.getSemantics() == &I.getSemantics() &&
425 "Invalid complex float (type mismatch).");
426 assert(isComplexFloat() && "Invalid accessor");
427 ((ComplexAPFloat *)(char *)Data.buffer)->Real = std::move(R);
428 ((ComplexAPFloat *)(char *)Data.buffer)->Imag = std::move(I);
430 void setLValue(LValueBase B, const CharUnits &O, NoLValuePath,
432 void setLValue(LValueBase B, const CharUnits &O,
433 ArrayRef<LValuePathEntry> Path, bool OnePastTheEnd,
435 void setUnion(const FieldDecl *Field, const APValue &Value) {
436 assert(isUnion() && "Invalid accessor");
437 ((UnionData*)(char*)Data.buffer)->Field = Field;
438 *((UnionData*)(char*)Data.buffer)->Value = Value;
440 void setAddrLabelDiff(const AddrLabelExpr* LHSExpr,
441 const AddrLabelExpr* RHSExpr) {
442 ((AddrLabelDiffData*)(char*)Data.buffer)->LHSExpr = LHSExpr;
443 ((AddrLabelDiffData*)(char*)Data.buffer)->RHSExpr = RHSExpr;
446 /// Assign by swapping from a copy of the RHS.
447 APValue &operator=(APValue RHS) {
453 void DestroyDataAndMakeUninit();
455 if (Kind != Uninitialized)
456 DestroyDataAndMakeUninit();
459 assert(isUninit() && "Bad state change");
460 new ((void*)Data.buffer) APSInt(1);
464 assert(isUninit() && "Bad state change");
465 new ((void*)(char*)Data.buffer) APFloat(0.0);
469 assert(isUninit() && "Bad state change");
470 new ((void*)(char*)Data.buffer) Vec();
473 void MakeComplexInt() {
474 assert(isUninit() && "Bad state change");
475 new ((void*)(char*)Data.buffer) ComplexAPSInt();
478 void MakeComplexFloat() {
479 assert(isUninit() && "Bad state change");
480 new ((void*)(char*)Data.buffer) ComplexAPFloat();
484 void MakeArray(unsigned InitElts, unsigned Size);
485 void MakeStruct(unsigned B, unsigned M) {
486 assert(isUninit() && "Bad state change");
487 new ((void*)(char*)Data.buffer) StructData(B, M);
491 assert(isUninit() && "Bad state change");
492 new ((void*)(char*)Data.buffer) UnionData();
495 void MakeMemberPointer(const ValueDecl *Member, bool IsDerivedMember,
496 ArrayRef<const CXXRecordDecl*> Path);
497 void MakeAddrLabelDiff() {
498 assert(isUninit() && "Bad state change");
499 new ((void*)(char*)Data.buffer) AddrLabelDiffData();
500 Kind = AddrLabelDiff;
504 } // end namespace clang.
507 template<> struct DenseMapInfo<clang::APValue::LValueBase> {
508 static clang::APValue::LValueBase getEmptyKey();
509 static clang::APValue::LValueBase getTombstoneKey();
510 static unsigned getHashValue(const clang::APValue::LValueBase &Base);
511 static bool isEqual(const clang::APValue::LValueBase &LHS,
512 const clang::APValue::LValueBase &RHS);