clang  6.0.0svn
SymbolManager.h
Go to the documentation of this file.
1 //== SymbolManager.h - Management of Symbolic Values ------------*- C++ -*--==//
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 defines SymbolManager, a class that manages symbolic values
11 // created for use by ExprEngine and related classes.
12 //
13 //===----------------------------------------------------------------------===//
14 
15 #ifndef LLVM_CLANG_STATICANALYZER_CORE_PATHSENSITIVE_SYMBOLMANAGER_H
16 #define LLVM_CLANG_STATICANALYZER_CORE_PATHSENSITIVE_SYMBOLMANAGER_H
17 
18 #include "clang/AST/Decl.h"
19 #include "clang/AST/Expr.h"
21 #include "clang/Basic/LLVM.h"
25 #include "llvm/ADT/DenseMap.h"
26 #include "llvm/ADT/DenseSet.h"
27 #include "llvm/ADT/FoldingSet.h"
28 #include "llvm/Support/Allocator.h"
29 #include "llvm/Support/DataTypes.h"
30 
31 namespace clang {
32  class ASTContext;
33  class StackFrameContext;
34 
35 namespace ento {
36  class BasicValueFactory;
37  class SubRegion;
38  class TypedValueRegion;
39  class VarRegion;
40 
41 ///\brief A symbol representing the value stored at a MemRegion.
42 class SymbolRegionValue : public SymbolData {
43  const TypedValueRegion *R;
44 
45 public:
47  : SymbolData(SymbolRegionValueKind, sym), R(r) {
48  assert(r);
49  assert(isValidTypeForSymbol(r->getValueType()));
50  }
51 
52  const TypedValueRegion* getRegion() const { return R; }
53 
54  static void Profile(llvm::FoldingSetNodeID& profile, const TypedValueRegion* R) {
55  profile.AddInteger((unsigned) SymbolRegionValueKind);
56  profile.AddPointer(R);
57  }
58 
59  void Profile(llvm::FoldingSetNodeID& profile) override {
60  Profile(profile, R);
61  }
62 
63  void dumpToStream(raw_ostream &os) const override;
64  const MemRegion *getOriginRegion() const override { return getRegion(); }
65 
66  QualType getType() const override;
67 
68  // Implement isa<T> support.
69  static inline bool classof(const SymExpr *SE) {
70  return SE->getKind() == SymbolRegionValueKind;
71  }
72 };
73 
74 /// A symbol representing the result of an expression in the case when we do
75 /// not know anything about what the expression is.
76 class SymbolConjured : public SymbolData {
77  const Stmt *S;
78  QualType T;
79  unsigned Count;
80  const LocationContext *LCtx;
81  const void *SymbolTag;
82 
83 public:
84  SymbolConjured(SymbolID sym, const Stmt *s, const LocationContext *lctx,
85  QualType t, unsigned count, const void *symbolTag)
86  : SymbolData(SymbolConjuredKind, sym), S(s), T(t), Count(count),
87  LCtx(lctx), SymbolTag(symbolTag) {
88  // FIXME: 's' might be a nullptr if we're conducting invalidation
89  // that was caused by a destructor call on a temporary object,
90  // which has no statement associated with it.
91  // Due to this, we might be creating the same invalidation symbol for
92  // two different invalidation passes (for two different temporaries).
93  assert(lctx);
94  assert(isValidTypeForSymbol(t));
95  }
96 
97  const Stmt *getStmt() const { return S; }
98  unsigned getCount() const { return Count; }
99  const void *getTag() const { return SymbolTag; }
100 
101  QualType getType() const override;
102 
103  void dumpToStream(raw_ostream &os) const override;
104 
105  static void Profile(llvm::FoldingSetNodeID& profile, const Stmt *S,
106  QualType T, unsigned Count, const LocationContext *LCtx,
107  const void *SymbolTag) {
108  profile.AddInteger((unsigned) SymbolConjuredKind);
109  profile.AddPointer(S);
110  profile.AddPointer(LCtx);
111  profile.Add(T);
112  profile.AddInteger(Count);
113  profile.AddPointer(SymbolTag);
114  }
115 
116  void Profile(llvm::FoldingSetNodeID& profile) override {
117  Profile(profile, S, T, Count, LCtx, SymbolTag);
118  }
119 
120  // Implement isa<T> support.
121  static inline bool classof(const SymExpr *SE) {
122  return SE->getKind() == SymbolConjuredKind;
123  }
124 };
125 
126 /// A symbol representing the value of a MemRegion whose parent region has
127 /// symbolic value.
128 class SymbolDerived : public SymbolData {
129  SymbolRef parentSymbol;
130  const TypedValueRegion *R;
131 
132 public:
134  : SymbolData(SymbolDerivedKind, sym), parentSymbol(parent), R(r) {
135  assert(parent);
136  assert(r);
137  assert(isValidTypeForSymbol(r->getValueType()));
138  }
139 
140  SymbolRef getParentSymbol() const { return parentSymbol; }
141  const TypedValueRegion *getRegion() const { return R; }
142 
143  QualType getType() const override;
144 
145  void dumpToStream(raw_ostream &os) const override;
146  const MemRegion *getOriginRegion() const override { return getRegion(); }
147 
148  static void Profile(llvm::FoldingSetNodeID& profile, SymbolRef parent,
149  const TypedValueRegion *r) {
150  profile.AddInteger((unsigned) SymbolDerivedKind);
151  profile.AddPointer(r);
152  profile.AddPointer(parent);
153  }
154 
155  void Profile(llvm::FoldingSetNodeID& profile) override {
156  Profile(profile, parentSymbol, R);
157  }
158 
159  // Implement isa<T> support.
160  static inline bool classof(const SymExpr *SE) {
161  return SE->getKind() == SymbolDerivedKind;
162  }
163 };
164 
165 /// SymbolExtent - Represents the extent (size in bytes) of a bounded region.
166 /// Clients should not ask the SymbolManager for a region's extent. Always use
167 /// SubRegion::getExtent instead -- the value returned may not be a symbol.
168 class SymbolExtent : public SymbolData {
169  const SubRegion *R;
170 
171 public:
173  : SymbolData(SymbolExtentKind, sym), R(r) {
174  assert(r);
175  }
176 
177  const SubRegion *getRegion() const { return R; }
178 
179  QualType getType() const override;
180 
181  void dumpToStream(raw_ostream &os) const override;
182 
183  static void Profile(llvm::FoldingSetNodeID& profile, const SubRegion *R) {
184  profile.AddInteger((unsigned) SymbolExtentKind);
185  profile.AddPointer(R);
186  }
187 
188  void Profile(llvm::FoldingSetNodeID& profile) override {
189  Profile(profile, R);
190  }
191 
192  // Implement isa<T> support.
193  static inline bool classof(const SymExpr *SE) {
194  return SE->getKind() == SymbolExtentKind;
195  }
196 };
197 
198 /// SymbolMetadata - Represents path-dependent metadata about a specific region.
199 /// Metadata symbols remain live as long as they are marked as in use before
200 /// dead-symbol sweeping AND their associated regions are still alive.
201 /// Intended for use by checkers.
202 class SymbolMetadata : public SymbolData {
203  const MemRegion* R;
204  const Stmt *S;
205  QualType T;
206  const LocationContext *LCtx;
207  unsigned Count;
208  const void *Tag;
209 public:
210  SymbolMetadata(SymbolID sym, const MemRegion* r, const Stmt *s, QualType t,
211  const LocationContext *LCtx, unsigned count, const void *tag)
212  : SymbolData(SymbolMetadataKind, sym), R(r), S(s), T(t), LCtx(LCtx),
213  Count(count), Tag(tag) {
214  assert(r);
215  assert(s);
216  assert(isValidTypeForSymbol(t));
217  assert(LCtx);
218  assert(tag);
219  }
220 
221  const MemRegion *getRegion() const { return R; }
222  const Stmt *getStmt() const { return S; }
223  const LocationContext *getLocationContext() const { return LCtx; }
224  unsigned getCount() const { return Count; }
225  const void *getTag() const { return Tag; }
226 
227  QualType getType() const override;
228 
229  void dumpToStream(raw_ostream &os) const override;
230 
231  static void Profile(llvm::FoldingSetNodeID& profile, const MemRegion *R,
232  const Stmt *S, QualType T, const LocationContext *LCtx,
233  unsigned Count, const void *Tag) {
234  profile.AddInteger((unsigned) SymbolMetadataKind);
235  profile.AddPointer(R);
236  profile.AddPointer(S);
237  profile.Add(T);
238  profile.AddPointer(LCtx);
239  profile.AddInteger(Count);
240  profile.AddPointer(Tag);
241  }
242 
243  void Profile(llvm::FoldingSetNodeID& profile) override {
244  Profile(profile, R, S, T, LCtx, Count, Tag);
245  }
246 
247  // Implement isa<T> support.
248  static inline bool classof(const SymExpr *SE) {
249  return SE->getKind() == SymbolMetadataKind;
250  }
251 };
252 
253 /// \brief Represents a cast expression.
254 class SymbolCast : public SymExpr {
255  const SymExpr *Operand;
256  /// Type of the operand.
257  QualType FromTy;
258  /// The type of the result.
259  QualType ToTy;
260 
261 public:
262  SymbolCast(const SymExpr *In, QualType From, QualType To)
263  : SymExpr(SymbolCastKind), Operand(In), FromTy(From), ToTy(To) {
264  assert(In);
265  assert(isValidTypeForSymbol(From));
266  // FIXME: GenericTaintChecker creates symbols of void type.
267  // Otherwise, 'To' should also be a valid type.
268  }
269 
270  QualType getType() const override { return ToTy; }
271 
272  const SymExpr *getOperand() const { return Operand; }
273 
274  void dumpToStream(raw_ostream &os) const override;
275 
276  static void Profile(llvm::FoldingSetNodeID& ID,
277  const SymExpr *In, QualType From, QualType To) {
278  ID.AddInteger((unsigned) SymbolCastKind);
279  ID.AddPointer(In);
280  ID.Add(From);
281  ID.Add(To);
282  }
283 
284  void Profile(llvm::FoldingSetNodeID& ID) override {
285  Profile(ID, Operand, FromTy, ToTy);
286  }
287 
288  // Implement isa<T> support.
289  static inline bool classof(const SymExpr *SE) {
290  return SE->getKind() == SymbolCastKind;
291  }
292 };
293 
294 /// \brief Represents a symbolic expression involving a binary operator
295 class BinarySymExpr : public SymExpr {
297  QualType T;
298 
299 protected:
301  : SymExpr(k), Op(op), T(t) {
302  assert(classof(this));
303  assert(isValidTypeForSymbol(t));
304  }
305 
306 public:
307  // FIXME: We probably need to make this out-of-line to avoid redundant
308  // generation of virtual functions.
309  QualType getType() const override { return T; }
310 
311  BinaryOperator::Opcode getOpcode() const { return Op; }
312 
313  // Implement isa<T> support.
314  static inline bool classof(const SymExpr *SE) {
315  Kind k = SE->getKind();
316  return k >= BEGIN_BINARYSYMEXPRS && k <= END_BINARYSYMEXPRS;
317  }
318 };
319 
320 /// \brief Represents a symbolic expression like 'x' + 3.
321 class SymIntExpr : public BinarySymExpr {
322  const SymExpr *LHS;
323  const llvm::APSInt& RHS;
324 
325 public:
327  const llvm::APSInt &rhs, QualType t)
328  : BinarySymExpr(SymIntExprKind, op, t), LHS(lhs), RHS(rhs) {
329  assert(lhs);
330  }
331 
332  void dumpToStream(raw_ostream &os) const override;
333 
334  const SymExpr *getLHS() const { return LHS; }
335  const llvm::APSInt &getRHS() const { return RHS; }
336 
337  static void Profile(llvm::FoldingSetNodeID& ID, const SymExpr *lhs,
338  BinaryOperator::Opcode op, const llvm::APSInt& rhs,
339  QualType t) {
340  ID.AddInteger((unsigned) SymIntExprKind);
341  ID.AddPointer(lhs);
342  ID.AddInteger(op);
343  ID.AddPointer(&rhs);
344  ID.Add(t);
345  }
346 
347  void Profile(llvm::FoldingSetNodeID& ID) override {
348  Profile(ID, LHS, getOpcode(), RHS, getType());
349  }
350 
351  // Implement isa<T> support.
352  static inline bool classof(const SymExpr *SE) {
353  return SE->getKind() == SymIntExprKind;
354  }
355 };
356 
357 /// \brief Represents a symbolic expression like 3 - 'x'.
358 class IntSymExpr : public BinarySymExpr {
359  const llvm::APSInt& LHS;
360  const SymExpr *RHS;
361 
362 public:
363  IntSymExpr(const llvm::APSInt &lhs, BinaryOperator::Opcode op,
364  const SymExpr *rhs, QualType t)
365  : BinarySymExpr(IntSymExprKind, op, t), LHS(lhs), RHS(rhs) {
366  assert(rhs);
367  }
368 
369  void dumpToStream(raw_ostream &os) const override;
370 
371  const SymExpr *getRHS() const { return RHS; }
372  const llvm::APSInt &getLHS() const { return LHS; }
373 
374  static void Profile(llvm::FoldingSetNodeID& ID, const llvm::APSInt& lhs,
375  BinaryOperator::Opcode op, const SymExpr *rhs,
376  QualType t) {
377  ID.AddInteger((unsigned) IntSymExprKind);
378  ID.AddPointer(&lhs);
379  ID.AddInteger(op);
380  ID.AddPointer(rhs);
381  ID.Add(t);
382  }
383 
384  void Profile(llvm::FoldingSetNodeID& ID) override {
385  Profile(ID, LHS, getOpcode(), RHS, getType());
386  }
387 
388  // Implement isa<T> support.
389  static inline bool classof(const SymExpr *SE) {
390  return SE->getKind() == IntSymExprKind;
391  }
392 };
393 
394 /// \brief Represents a symbolic expression like 'x' + 'y'.
395 class SymSymExpr : public BinarySymExpr {
396  const SymExpr *LHS;
397  const SymExpr *RHS;
398 
399 public:
400  SymSymExpr(const SymExpr *lhs, BinaryOperator::Opcode op, const SymExpr *rhs,
401  QualType t)
402  : BinarySymExpr(SymSymExprKind, op, t), LHS(lhs), RHS(rhs) {
403  assert(lhs);
404  assert(rhs);
405  }
406 
407  const SymExpr *getLHS() const { return LHS; }
408  const SymExpr *getRHS() const { return RHS; }
409 
410  void dumpToStream(raw_ostream &os) const override;
411 
412  static void Profile(llvm::FoldingSetNodeID& ID, const SymExpr *lhs,
413  BinaryOperator::Opcode op, const SymExpr *rhs, QualType t) {
414  ID.AddInteger((unsigned) SymSymExprKind);
415  ID.AddPointer(lhs);
416  ID.AddInteger(op);
417  ID.AddPointer(rhs);
418  ID.Add(t);
419  }
420 
421  void Profile(llvm::FoldingSetNodeID& ID) override {
422  Profile(ID, LHS, getOpcode(), RHS, getType());
423  }
424 
425  // Implement isa<T> support.
426  static inline bool classof(const SymExpr *SE) {
427  return SE->getKind() == SymSymExprKind;
428  }
429 };
430 
432  typedef llvm::FoldingSet<SymExpr> DataSetTy;
433  typedef llvm::DenseMap<SymbolRef, SymbolRefSmallVectorTy*> SymbolDependTy;
434 
435  DataSetTy DataSet;
436  /// Stores the extra dependencies between symbols: the data should be kept
437  /// alive as long as the key is live.
438  SymbolDependTy SymbolDependencies;
439  unsigned SymbolCounter;
440  llvm::BumpPtrAllocator& BPAlloc;
441  BasicValueFactory &BV;
442  ASTContext &Ctx;
443 
444 public:
446  llvm::BumpPtrAllocator& bpalloc)
447  : SymbolDependencies(16), SymbolCounter(0),
448  BPAlloc(bpalloc), BV(bv), Ctx(ctx) {}
449 
450  ~SymbolManager();
451 
452  static bool canSymbolicate(QualType T);
453 
454  /// \brief Make a unique symbol for MemRegion R according to its kind.
455  const SymbolRegionValue* getRegionValueSymbol(const TypedValueRegion* R);
456 
457  const SymbolConjured* conjureSymbol(const Stmt *E,
458  const LocationContext *LCtx,
459  QualType T,
460  unsigned VisitCount,
461  const void *SymbolTag = nullptr);
462 
464  const LocationContext *LCtx,
465  unsigned VisitCount,
466  const void *SymbolTag = nullptr) {
467  return conjureSymbol(E, LCtx, E->getType(), VisitCount, SymbolTag);
468  }
469 
470  const SymbolDerived *getDerivedSymbol(SymbolRef parentSymbol,
471  const TypedValueRegion *R);
472 
473  const SymbolExtent *getExtentSymbol(const SubRegion *R);
474 
475  /// \brief Creates a metadata symbol associated with a specific region.
476  ///
477  /// VisitCount can be used to differentiate regions corresponding to
478  /// different loop iterations, thus, making the symbol path-dependent.
479  const SymbolMetadata *getMetadataSymbol(const MemRegion *R, const Stmt *S,
480  QualType T,
481  const LocationContext *LCtx,
482  unsigned VisitCount,
483  const void *SymbolTag = nullptr);
484 
485  const SymbolCast* getCastSymbol(const SymExpr *Operand,
486  QualType From, QualType To);
487 
488  const SymIntExpr *getSymIntExpr(const SymExpr *lhs, BinaryOperator::Opcode op,
489  const llvm::APSInt& rhs, QualType t);
490 
492  const llvm::APSInt& rhs, QualType t) {
493  return getSymIntExpr(&lhs, op, rhs, t);
494  }
495 
496  const IntSymExpr *getIntSymExpr(const llvm::APSInt& lhs,
498  const SymExpr *rhs, QualType t);
499 
500  const SymSymExpr *getSymSymExpr(const SymExpr *lhs, BinaryOperator::Opcode op,
501  const SymExpr *rhs, QualType t);
502 
503  QualType getType(const SymExpr *SE) const {
504  return SE->getType();
505  }
506 
507  /// \brief Add artificial symbol dependency.
508  ///
509  /// The dependent symbol should stay alive as long as the primary is alive.
510  void addSymbolDependency(const SymbolRef Primary, const SymbolRef Dependent);
511 
512  const SymbolRefSmallVectorTy *getDependentSymbols(const SymbolRef Primary);
513 
514  ASTContext &getContext() { return Ctx; }
515  BasicValueFactory &getBasicVals() { return BV; }
516 };
517 
518 /// \brief A class responsible for cleaning up unused symbols.
520  enum SymbolStatus {
521  NotProcessed,
522  HaveMarkedDependents
523  };
524 
526  typedef llvm::DenseMap<SymbolRef, SymbolStatus> SymbolMapTy;
528 
529  SymbolMapTy TheLiving;
530  SymbolSetTy MetadataInUse;
531  SymbolSetTy TheDead;
532 
533  RegionSetTy RegionRoots;
534 
535  const StackFrameContext *LCtx;
536  const Stmt *Loc;
537  SymbolManager& SymMgr;
538  StoreRef reapedStore;
539  llvm::DenseMap<const MemRegion *, unsigned> includedRegionCache;
540 
541 public:
542  /// \brief Construct a reaper object, which removes everything which is not
543  /// live before we execute statement s in the given location context.
544  ///
545  /// If the statement is NULL, everything is this and parent contexts is
546  /// considered live.
547  /// If the stack frame context is NULL, everything on stack is considered
548  /// dead.
549  SymbolReaper(const StackFrameContext *Ctx, const Stmt *s, SymbolManager& symmgr,
550  StoreManager &storeMgr)
551  : LCtx(Ctx), Loc(s), SymMgr(symmgr),
552  reapedStore(nullptr, storeMgr) {}
553 
554  const LocationContext *getLocationContext() const { return LCtx; }
555 
556  bool isLive(SymbolRef sym);
557  bool isLiveRegion(const MemRegion *region);
558  bool isLive(const Stmt *ExprVal, const LocationContext *LCtx) const;
559  bool isLive(const VarRegion *VR, bool includeStoreBindings = false) const;
560 
561  /// \brief Unconditionally marks a symbol as live.
562  ///
563  /// This should never be
564  /// used by checkers, only by the state infrastructure such as the store and
565  /// environment. Checkers should instead use metadata symbols and markInUse.
566  void markLive(SymbolRef sym);
567 
568  /// \brief Marks a symbol as important to a checker.
569  ///
570  /// For metadata symbols,
571  /// this will keep the symbol alive as long as its associated region is also
572  /// live. For other symbols, this has no effect; checkers are not permitted
573  /// to influence the life of other symbols. This should be used before any
574  /// symbol marking has occurred, i.e. in the MarkLiveSymbols callback.
575  void markInUse(SymbolRef sym);
576 
577  /// \brief If a symbol is known to be live, marks the symbol as live.
578  ///
579  /// Otherwise, if the symbol cannot be proven live, it is marked as dead.
580  /// Returns true if the symbol is dead, false if live.
581  bool maybeDead(SymbolRef sym);
582 
583  typedef SymbolSetTy::const_iterator dead_iterator;
584  dead_iterator dead_begin() const { return TheDead.begin(); }
585  dead_iterator dead_end() const { return TheDead.end(); }
586 
587  bool hasDeadSymbols() const {
588  return !TheDead.empty();
589  }
590 
591  typedef RegionSetTy::const_iterator region_iterator;
592  region_iterator region_begin() const { return RegionRoots.begin(); }
593  region_iterator region_end() const { return RegionRoots.end(); }
594 
595  /// \brief Returns whether or not a symbol has been confirmed dead.
596  ///
597  /// This should only be called once all marking of dead symbols has completed.
598  /// (For checkers, this means only in the evalDeadSymbols callback.)
599  bool isDead(SymbolRef sym) const {
600  return TheDead.count(sym);
601  }
602 
603  void markLive(const MemRegion *region);
604  void markElementIndicesLive(const MemRegion *region);
605 
606  /// \brief Set to the value of the symbolic store after
607  /// StoreManager::removeDeadBindings has been called.
608  void setReapedStore(StoreRef st) { reapedStore = st; }
609 
610 private:
611  /// Mark the symbols dependent on the input symbol as live.
612  void markDependentsLive(SymbolRef sym);
613 };
614 
616 protected:
617  ~SymbolVisitor() = default;
618 
619 public:
620  SymbolVisitor() = default;
621  SymbolVisitor(const SymbolVisitor &) = default;
623 
624  /// \brief A visitor method invoked by ProgramStateManager::scanReachableSymbols.
625  ///
626  /// The method returns \c true if symbols should continue be scanned and \c
627  /// false otherwise.
628  virtual bool VisitSymbol(SymbolRef sym) = 0;
629  virtual bool VisitMemRegion(const MemRegion *region) { return true; }
630 };
631 
632 } // end GR namespace
633 
634 } // end clang namespace
635 
636 namespace llvm {
637 static inline raw_ostream &operator<<(raw_ostream &os,
638  const clang::ento::SymExpr *SE) {
639  SE->dumpToStream(os);
640  return os;
641 }
642 } // end llvm namespace
643 #endif
static bool classof(const SymExpr *SE)
TypedValueRegion - An abstract class representing regions having a typed value.
Definition: MemRegion.h:511
A (possibly-)qualified type.
Definition: Type.h:614
MemRegion - The root abstract class for all memory regions.
Definition: MemRegion.h:79
SymbolDerived(SymbolID sym, SymbolRef parent, const TypedValueRegion *r)
DominatorTree GraphTraits specialization so the DominatorTree can be iterable by generic graph iterat...
Definition: Dominators.h:26
Stmt - This represents one statement.
Definition: Stmt.h:60
static void Profile(llvm::FoldingSetNodeID &profile, const TypedValueRegion *R)
Definition: SymbolManager.h:54
static bool classof(const SymExpr *SE)
unsigned SymbolID
Definition: SymExpr.h:104
virtual QualType getValueType() const =0
const SymExpr * getOperand() const
void Profile(llvm::FoldingSetNodeID &profile) override
BasicValueFactory & getBasicVals()
bool isDead(SymbolRef sym) const
Returns whether or not a symbol has been confirmed dead.
SymbolManager(ASTContext &ctx, BasicValueFactory &bv, llvm::BumpPtrAllocator &bpalloc)
Symbolic value.
Definition: SymExpr.h:29
SymbolCast(const SymExpr *In, QualType From, QualType To)
Holds long-lived AST nodes (such as types and decls) that can be referred to throughout the semantic ...
Definition: ASTContext.h:128
static void Profile(llvm::FoldingSetNodeID &profile, SymbolRef parent, const TypedValueRegion *r)
void Profile(llvm::FoldingSetNodeID &profile) override
SymbolReaper(const StackFrameContext *Ctx, const Stmt *s, SymbolManager &symmgr, StoreManager &storeMgr)
Construct a reaper object, which removes everything which is not live before we execute statement s i...
unsigned getCount() const
Definition: SymbolManager.h:98
void setReapedStore(StoreRef st)
Set to the value of the symbolic store after StoreManager::removeDeadBindings has been called...
static void Profile(llvm::FoldingSetNodeID &ID, const SymExpr *lhs, BinaryOperator::Opcode op, const llvm::APSInt &rhs, QualType t)
SymbolConjured(SymbolID sym, const Stmt *s, const LocationContext *lctx, QualType t, unsigned count, const void *symbolTag)
Definition: SymbolManager.h:84
SymbolExtent(SymbolID sym, const SubRegion *r)
BinaryOperatorKind
static bool classof(const SymExpr *SE)
virtual void dumpToStream(raw_ostream &os) const
Definition: SymExpr.h:58
Forward-declares and imports various common LLVM datatypes that clang wants to use unqualified...
QualType getType(const SymExpr *SE) const
Represents a symbolic expression like &#39;x&#39; + 3.
A symbol representing the value of a MemRegion whose parent region has symbolic value.
void Profile(llvm::FoldingSetNodeID &ID) override
const MemRegion * getRegion() const
virtual QualType getType() const =0
static void Profile(llvm::FoldingSetNodeID &ID, const llvm::APSInt &lhs, BinaryOperator::Opcode op, const SymExpr *rhs, QualType t)
const void * getTag() const
const LocationContext * getLocationContext() const
static bool classof(const SymExpr *SE)
static void Profile(llvm::FoldingSetNodeID &profile, const Stmt *S, QualType T, unsigned Count, const LocationContext *LCtx, const void *SymbolTag)
const SymIntExpr * getSymIntExpr(const SymExpr &lhs, BinaryOperator::Opcode op, const llvm::APSInt &rhs, QualType t)
Expr - This represents one expression.
Definition: Expr.h:106
const TypedValueRegion * getRegion() const
const FunctionProtoType * T
void Profile(llvm::FoldingSetNodeID &profile) override
const SubRegion * getRegion() const
SymbolSetTy::const_iterator dead_iterator
Represents a cast expression.
const LocationContext * getLocationContext() const
QualType getType() const
Definition: Expr.h:128
static void Profile(llvm::FoldingSetNodeID &profile, const MemRegion *R, const Stmt *S, QualType T, const LocationContext *LCtx, unsigned Count, const void *Tag)
static bool classof(const SymExpr *SE)
RegionSetTy::const_iterator region_iterator
IntSymExpr(const llvm::APSInt &lhs, BinaryOperator::Opcode op, const SymExpr *rhs, QualType t)
const SymExpr * getRHS() const
static bool classof(const SymExpr *SE)
Definition: SymbolManager.h:69
virtual bool VisitMemRegion(const MemRegion *region)
const TypedValueRegion * getRegion() const
Definition: SymbolManager.h:52
const SymExpr * getLHS() const
const void * getTag() const
Definition: SymbolManager.h:99
Represents a symbolic expression like 3 - &#39;x&#39;.
const SymbolConjured * conjureSymbol(const Expr *E, const LocationContext *LCtx, unsigned VisitCount, const void *SymbolTag=nullptr)
void dumpToStream(raw_ostream &os) const override
QualType getType() const override
const llvm::APSInt & getLHS() const
A class responsible for cleaning up unused symbols.
SymIntExpr(const SymExpr *lhs, BinaryOperator::Opcode op, const llvm::APSInt &rhs, QualType t)
region_iterator region_end() const
QualType getType() const override
A symbol representing the result of an expression in the case when we do not know anything about what...
Definition: SymbolManager.h:76
static bool isValidTypeForSymbol(QualType T)
Definition: SymExpr.h:45
A symbol representing the value stored at a MemRegion.
Definition: SymbolManager.h:42
Dataflow Directional Tag Classes.
static void Profile(llvm::FoldingSetNodeID &ID, const SymExpr *In, QualType From, QualType To)
SymbolRegionValue(SymbolID sym, const TypedValueRegion *r)
Definition: SymbolManager.h:46
raw_ostream & operator<<(raw_ostream &Out, const CheckerBase &Checker)
Dump checker name to stream.
Definition: Checker.cpp:34
Represents a symbolic expression involving a binary operator.
const llvm::APSInt & getRHS() const
BinaryOperator::Opcode getOpcode(const SymExpr *SE)
region_iterator region_begin() const
const MemRegion * getOriginRegion() const override
Find the region from which this symbol originates.
const Stmt * getStmt() const
QualType getType() const override
static bool classof(const SymExpr *SE)
SymbolMetadata(SymbolID sym, const MemRegion *r, const Stmt *s, QualType t, const LocationContext *LCtx, unsigned count, const void *tag)
void Profile(llvm::FoldingSetNodeID &ID) override
dead_iterator dead_begin() const
const SymExpr * getRHS() const
SymbolVisitor(SymbolVisitor &&)
static bool classof(const SymExpr *SE)
SubRegion - A region that subsets another larger region.
Definition: MemRegion.h:419
void Profile(llvm::FoldingSetNodeID &ID) override
const Stmt * getStmt() const
Definition: SymbolManager.h:97
SymbolMetadata - Represents path-dependent metadata about a specific region.
dead_iterator dead_end() const
static void Profile(llvm::FoldingSetNodeID &profile, const SubRegion *R)
Kind getKind() const
Definition: SymExpr.h:54
const MemRegion * getOriginRegion() const override
Find the region from which this symbol originates.
Definition: SymbolManager.h:64
BinaryOperator::Opcode getOpcode() const
SymbolRef getParentSymbol() const
SymSymExpr(const SymExpr *lhs, BinaryOperator::Opcode op, const SymExpr *rhs, QualType t)
void Profile(llvm::FoldingSetNodeID &profile) override
Definition: SymbolManager.h:59
static bool classof(const SymExpr *SE)
static bool classof(const SymExpr *SE)
BinarySymExpr(Kind k, BinaryOperator::Opcode op, QualType t)
SymbolExtent - Represents the extent (size in bytes) of a bounded region.
void Profile(llvm::FoldingSetNodeID &profile) override
void Profile(llvm::FoldingSetNodeID &ID) override
Represents a symbolic expression like &#39;x&#39; + &#39;y&#39;.
A symbol representing data which can be stored in a memory location (region).
Definition: SymExpr.h:107
const SymExpr * getLHS() const
static void Profile(llvm::FoldingSetNodeID &ID, const SymExpr *lhs, BinaryOperator::Opcode op, const SymExpr *rhs, QualType t)