clang  8.0.0svn
SymbolManager.h
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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/Expr.h"
19 #include "clang/AST/Type.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 <cassert>
30 
31 namespace clang {
32 
33 class ASTContext;
34 class Stmt;
35 
36 namespace ento {
37 
38 class BasicValueFactory;
39 class StoreManager;
40 
41 ///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 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 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 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 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 
210 public:
211  SymbolMetadata(SymbolID sym, const MemRegion* r, const Stmt *s, QualType t,
212  const LocationContext *LCtx, unsigned count, const void *tag)
213  : SymbolData(SymbolMetadataKind, sym), R(r), S(s), T(t), LCtx(LCtx),
214  Count(count), Tag(tag) {
215  assert(r);
216  assert(s);
217  assert(isValidTypeForSymbol(t));
218  assert(LCtx);
219  assert(tag);
220  }
221 
222  const MemRegion *getRegion() const { return R; }
223  const Stmt *getStmt() const { return S; }
224  const LocationContext *getLocationContext() const { return LCtx; }
225  unsigned getCount() const { return Count; }
226  const void *getTag() const { return Tag; }
227 
228  QualType getType() const override;
229 
230  void dumpToStream(raw_ostream &os) const override;
231 
232  static void Profile(llvm::FoldingSetNodeID& profile, const MemRegion *R,
233  const Stmt *S, QualType T, const LocationContext *LCtx,
234  unsigned Count, const void *Tag) {
235  profile.AddInteger((unsigned) SymbolMetadataKind);
236  profile.AddPointer(R);
237  profile.AddPointer(S);
238  profile.Add(T);
239  profile.AddPointer(LCtx);
240  profile.AddInteger(Count);
241  profile.AddPointer(Tag);
242  }
243 
244  void Profile(llvm::FoldingSetNodeID& profile) override {
245  Profile(profile, R, S, T, LCtx, Count, Tag);
246  }
247 
248  // Implement isa<T> support.
249  static bool classof(const SymExpr *SE) {
250  return SE->getKind() == SymbolMetadataKind;
251  }
252 };
253 
254 /// Represents a cast expression.
255 class SymbolCast : public SymExpr {
256  const SymExpr *Operand;
257 
258  /// Type of the operand.
259  QualType FromTy;
260 
261  /// The type of the result.
262  QualType ToTy;
263 
264 public:
265  SymbolCast(const SymExpr *In, QualType From, QualType To)
266  : SymExpr(SymbolCastKind), Operand(In), FromTy(From), ToTy(To) {
267  assert(In);
268  assert(isValidTypeForSymbol(From));
269  // FIXME: GenericTaintChecker creates symbols of void type.
270  // Otherwise, 'To' should also be a valid type.
271  }
272 
273  unsigned computeComplexity() const override {
274  if (Complexity == 0)
275  Complexity = 1 + Operand->computeComplexity();
276  return Complexity;
277  }
278 
279  QualType getType() const override { return ToTy; }
280 
281  const SymExpr *getOperand() const { return Operand; }
282 
283  void dumpToStream(raw_ostream &os) const override;
284 
285  static void Profile(llvm::FoldingSetNodeID& ID,
286  const SymExpr *In, QualType From, QualType To) {
287  ID.AddInteger((unsigned) SymbolCastKind);
288  ID.AddPointer(In);
289  ID.Add(From);
290  ID.Add(To);
291  }
292 
293  void Profile(llvm::FoldingSetNodeID& ID) override {
294  Profile(ID, Operand, FromTy, ToTy);
295  }
296 
297  // Implement isa<T> support.
298  static bool classof(const SymExpr *SE) {
299  return SE->getKind() == SymbolCastKind;
300  }
301 };
302 
303 /// Represents a symbolic expression involving a binary operator
304 class BinarySymExpr : public SymExpr {
306  QualType T;
307 
308 protected:
310  : SymExpr(k), Op(op), T(t) {
311  assert(classof(this));
312  assert(isValidTypeForSymbol(t));
313  }
314 
315 public:
316  // FIXME: We probably need to make this out-of-line to avoid redundant
317  // generation of virtual functions.
318  QualType getType() const override { return T; }
319 
320  BinaryOperator::Opcode getOpcode() const { return Op; }
321 
322  // Implement isa<T> support.
323  static bool classof(const SymExpr *SE) {
324  Kind k = SE->getKind();
325  return k >= BEGIN_BINARYSYMEXPRS && k <= END_BINARYSYMEXPRS;
326  }
327 };
328 
329 /// Represents a symbolic expression like 'x' + 3.
330 class SymIntExpr : public BinarySymExpr {
331  const SymExpr *LHS;
332  const llvm::APSInt& RHS;
333 
334 public:
336  const llvm::APSInt &rhs, QualType t)
337  : BinarySymExpr(SymIntExprKind, op, t), LHS(lhs), RHS(rhs) {
338  assert(lhs);
339  }
340 
341  void dumpToStream(raw_ostream &os) const override;
342 
343  const SymExpr *getLHS() const { return LHS; }
344  const llvm::APSInt &getRHS() const { return RHS; }
345 
346  unsigned computeComplexity() const override {
347  if (Complexity == 0)
348  Complexity = 1 + LHS->computeComplexity();
349  return Complexity;
350  }
351 
352  static void Profile(llvm::FoldingSetNodeID& ID, const SymExpr *lhs,
353  BinaryOperator::Opcode op, const llvm::APSInt& rhs,
354  QualType t) {
355  ID.AddInteger((unsigned) SymIntExprKind);
356  ID.AddPointer(lhs);
357  ID.AddInteger(op);
358  ID.AddPointer(&rhs);
359  ID.Add(t);
360  }
361 
362  void Profile(llvm::FoldingSetNodeID& ID) override {
363  Profile(ID, LHS, getOpcode(), RHS, getType());
364  }
365 
366  // Implement isa<T> support.
367  static bool classof(const SymExpr *SE) {
368  return SE->getKind() == SymIntExprKind;
369  }
370 };
371 
372 /// Represents a symbolic expression like 3 - 'x'.
373 class IntSymExpr : public BinarySymExpr {
374  const llvm::APSInt& LHS;
375  const SymExpr *RHS;
376 
377 public:
378  IntSymExpr(const llvm::APSInt &lhs, BinaryOperator::Opcode op,
379  const SymExpr *rhs, QualType t)
380  : BinarySymExpr(IntSymExprKind, op, t), LHS(lhs), RHS(rhs) {
381  assert(rhs);
382  }
383 
384  void dumpToStream(raw_ostream &os) const override;
385 
386  const SymExpr *getRHS() const { return RHS; }
387  const llvm::APSInt &getLHS() const { return LHS; }
388 
389  unsigned computeComplexity() const override {
390  if (Complexity == 0)
391  Complexity = 1 + RHS->computeComplexity();
392  return Complexity;
393  }
394 
395  static void Profile(llvm::FoldingSetNodeID& ID, const llvm::APSInt& lhs,
396  BinaryOperator::Opcode op, const SymExpr *rhs,
397  QualType t) {
398  ID.AddInteger((unsigned) IntSymExprKind);
399  ID.AddPointer(&lhs);
400  ID.AddInteger(op);
401  ID.AddPointer(rhs);
402  ID.Add(t);
403  }
404 
405  void Profile(llvm::FoldingSetNodeID& ID) override {
406  Profile(ID, LHS, getOpcode(), RHS, getType());
407  }
408 
409  // Implement isa<T> support.
410  static bool classof(const SymExpr *SE) {
411  return SE->getKind() == IntSymExprKind;
412  }
413 };
414 
415 /// Represents a symbolic expression like 'x' + 'y'.
416 class SymSymExpr : public BinarySymExpr {
417  const SymExpr *LHS;
418  const SymExpr *RHS;
419 
420 public:
421  SymSymExpr(const SymExpr *lhs, BinaryOperator::Opcode op, const SymExpr *rhs,
422  QualType t)
423  : BinarySymExpr(SymSymExprKind, op, t), LHS(lhs), RHS(rhs) {
424  assert(lhs);
425  assert(rhs);
426  }
427 
428  const SymExpr *getLHS() const { return LHS; }
429  const SymExpr *getRHS() const { return RHS; }
430 
431  void dumpToStream(raw_ostream &os) const override;
432 
433  unsigned computeComplexity() const override {
434  if (Complexity == 0)
436  return Complexity;
437  }
438 
439  static void Profile(llvm::FoldingSetNodeID& ID, const SymExpr *lhs,
440  BinaryOperator::Opcode op, const SymExpr *rhs, QualType t) {
441  ID.AddInteger((unsigned) SymSymExprKind);
442  ID.AddPointer(lhs);
443  ID.AddInteger(op);
444  ID.AddPointer(rhs);
445  ID.Add(t);
446  }
447 
448  void Profile(llvm::FoldingSetNodeID& ID) override {
449  Profile(ID, LHS, getOpcode(), RHS, getType());
450  }
451 
452  // Implement isa<T> support.
453  static bool classof(const SymExpr *SE) {
454  return SE->getKind() == SymSymExprKind;
455  }
456 };
457 
459  using DataSetTy = llvm::FoldingSet<SymExpr>;
460  using SymbolDependTy = llvm::DenseMap<SymbolRef, SymbolRefSmallVectorTy *>;
461 
462  DataSetTy DataSet;
463 
464  /// Stores the extra dependencies between symbols: the data should be kept
465  /// alive as long as the key is live.
466  SymbolDependTy SymbolDependencies;
467 
468  unsigned SymbolCounter = 0;
469  llvm::BumpPtrAllocator& BPAlloc;
470  BasicValueFactory &BV;
471  ASTContext &Ctx;
472 
473 public:
475  llvm::BumpPtrAllocator& bpalloc)
476  : SymbolDependencies(16), BPAlloc(bpalloc), BV(bv), Ctx(ctx) {}
477  ~SymbolManager();
478 
479  static bool canSymbolicate(QualType T);
480 
481  /// Make a unique symbol for MemRegion R according to its kind.
482  const SymbolRegionValue* getRegionValueSymbol(const TypedValueRegion* R);
483 
484  const SymbolConjured* conjureSymbol(const Stmt *E,
485  const LocationContext *LCtx,
486  QualType T,
487  unsigned VisitCount,
488  const void *SymbolTag = nullptr);
489 
491  const LocationContext *LCtx,
492  unsigned VisitCount,
493  const void *SymbolTag = nullptr) {
494  return conjureSymbol(E, LCtx, E->getType(), VisitCount, SymbolTag);
495  }
496 
497  const SymbolDerived *getDerivedSymbol(SymbolRef parentSymbol,
498  const TypedValueRegion *R);
499 
500  const SymbolExtent *getExtentSymbol(const SubRegion *R);
501 
502  /// Creates a metadata symbol associated with a specific region.
503  ///
504  /// VisitCount can be used to differentiate regions corresponding to
505  /// different loop iterations, thus, making the symbol path-dependent.
506  const SymbolMetadata *getMetadataSymbol(const MemRegion *R, const Stmt *S,
507  QualType T,
508  const LocationContext *LCtx,
509  unsigned VisitCount,
510  const void *SymbolTag = nullptr);
511 
512  const SymbolCast* getCastSymbol(const SymExpr *Operand,
513  QualType From, QualType To);
514 
515  const SymIntExpr *getSymIntExpr(const SymExpr *lhs, BinaryOperator::Opcode op,
516  const llvm::APSInt& rhs, QualType t);
517 
519  const llvm::APSInt& rhs, QualType t) {
520  return getSymIntExpr(&lhs, op, rhs, t);
521  }
522 
523  const IntSymExpr *getIntSymExpr(const llvm::APSInt& lhs,
525  const SymExpr *rhs, QualType t);
526 
527  const SymSymExpr *getSymSymExpr(const SymExpr *lhs, BinaryOperator::Opcode op,
528  const SymExpr *rhs, QualType t);
529 
530  QualType getType(const SymExpr *SE) const {
531  return SE->getType();
532  }
533 
534  /// Add artificial symbol dependency.
535  ///
536  /// The dependent symbol should stay alive as long as the primary is alive.
537  void addSymbolDependency(const SymbolRef Primary, const SymbolRef Dependent);
538 
539  const SymbolRefSmallVectorTy *getDependentSymbols(const SymbolRef Primary);
540 
541  ASTContext &getContext() { return Ctx; }
542  BasicValueFactory &getBasicVals() { return BV; }
543 };
544 
545 /// A class responsible for cleaning up unused symbols.
547  enum SymbolStatus {
548  NotProcessed,
549  HaveMarkedDependents
550  };
551 
553  using SymbolMapTy = llvm::DenseMap<SymbolRef, SymbolStatus>;
555 
556  SymbolMapTy TheLiving;
557  SymbolSetTy MetadataInUse;
558  SymbolSetTy TheDead;
559 
560  RegionSetTy RegionRoots;
561 
562  const StackFrameContext *LCtx;
563  const Stmt *Loc;
564  SymbolManager& SymMgr;
565  StoreRef reapedStore;
566  llvm::DenseMap<const MemRegion *, unsigned> includedRegionCache;
567 
568 public:
569  /// Construct a reaper object, which removes everything which is not
570  /// live before we execute statement s in the given location context.
571  ///
572  /// If the statement is NULL, everything is this and parent contexts is
573  /// considered live.
574  /// If the stack frame context is NULL, everything on stack is considered
575  /// dead.
576  SymbolReaper(const StackFrameContext *Ctx, const Stmt *s,
577  SymbolManager &symmgr, StoreManager &storeMgr)
578  : LCtx(Ctx), Loc(s), SymMgr(symmgr), reapedStore(nullptr, storeMgr) {}
579 
580  const LocationContext *getLocationContext() const { return LCtx; }
581 
582  bool isLive(SymbolRef sym);
583  bool isLiveRegion(const MemRegion *region);
584  bool isLive(const Stmt *ExprVal, const LocationContext *LCtx) const;
585  bool isLive(const VarRegion *VR, bool includeStoreBindings = false) const;
586 
587  /// Unconditionally marks a symbol as live.
588  ///
589  /// This should never be
590  /// used by checkers, only by the state infrastructure such as the store and
591  /// environment. Checkers should instead use metadata symbols and markInUse.
592  void markLive(SymbolRef sym);
593 
594  /// Marks a symbol as important to a checker.
595  ///
596  /// For metadata symbols,
597  /// this will keep the symbol alive as long as its associated region is also
598  /// live. For other symbols, this has no effect; checkers are not permitted
599  /// to influence the life of other symbols. This should be used before any
600  /// symbol marking has occurred, i.e. in the MarkLiveSymbols callback.
601  void markInUse(SymbolRef sym);
602 
603  /// If a symbol is known to be live, marks the symbol as live.
604  ///
605  /// Otherwise, if the symbol cannot be proven live, it is marked as dead.
606  /// Returns true if the symbol is dead, false if live.
607  bool maybeDead(SymbolRef sym);
608 
609  using dead_iterator = SymbolSetTy::const_iterator;
610 
611  dead_iterator dead_begin() const { return TheDead.begin(); }
612  dead_iterator dead_end() const { return TheDead.end(); }
613 
614  bool hasDeadSymbols() const {
615  return !TheDead.empty();
616  }
617 
618  using region_iterator = RegionSetTy::const_iterator;
619 
620  region_iterator region_begin() const { return RegionRoots.begin(); }
621  region_iterator region_end() const { return RegionRoots.end(); }
622 
623  /// Returns whether or not a symbol has been confirmed dead.
624  ///
625  /// This should only be called once all marking of dead symbols has completed.
626  /// (For checkers, this means only in the evalDeadSymbols callback.)
627  bool isDead(SymbolRef sym) const {
628  return TheDead.count(sym);
629  }
630 
631  void markLive(const MemRegion *region);
632  void markElementIndicesLive(const MemRegion *region);
633 
634  /// Set to the value of the symbolic store after
635  /// StoreManager::removeDeadBindings has been called.
636  void setReapedStore(StoreRef st) { reapedStore = st; }
637 
638 private:
639  /// Mark the symbols dependent on the input symbol as live.
640  void markDependentsLive(SymbolRef sym);
641 };
642 
644 protected:
645  ~SymbolVisitor() = default;
646 
647 public:
648  SymbolVisitor() = default;
649  SymbolVisitor(const SymbolVisitor &) = default;
651 
652  /// A visitor method invoked by ProgramStateManager::scanReachableSymbols.
653  ///
654  /// The method returns \c true if symbols should continue be scanned and \c
655  /// false otherwise.
656  virtual bool VisitSymbol(SymbolRef sym) = 0;
657  virtual bool VisitMemRegion(const MemRegion *region) { return true; }
658 };
659 
660 } // namespace ento
661 
662 } // namespace clang
663 
664 #endif // LLVM_CLANG_STATICANALYZER_CORE_PATHSENSITIVE_SYMBOLMANAGER_H
static bool classof(const SymExpr *SE)
TypedValueRegion - An abstract class representing regions having a typed value.
Definition: MemRegion.h:525
A (possibly-)qualified type.
Definition: Type.h:640
MemRegion - The root abstract class for all memory regions.
Definition: MemRegion.h:94
SymbolDerived(SymbolID sym, SymbolRef parent, const TypedValueRegion *r)
unsigned computeComplexity() const override
Stmt - This represents one statement.
Definition: Stmt.h:66
C Language Family Type Representation.
static void Profile(llvm::FoldingSetNodeID &profile, const TypedValueRegion *R)
Definition: SymbolManager.h:54
static bool classof(const SymExpr *SE)
virtual QualType getValueType() const =0
const SymExpr * getOperand() const
void Profile(llvm::FoldingSetNodeID &profile) override
virtual unsigned computeComplexity() const =0
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:30
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:153
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
unsigned Complexity
Definition: SymExpr.h:52
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)
Forward-declares and imports various common LLVM datatypes that clang wants to use unqualified...
QualType getType(const SymExpr *SE) const
RegionSetTy::const_iterator region_iterator
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
void Profile(llvm::FoldingSetNodeID &profile) override
const SubRegion * getRegion() const
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)
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)
unsigned computeComplexity() const override
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:46
SymbolSetTy::const_iterator dead_iterator
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
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
unsigned computeComplexity() const 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:431
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:57
unsigned SymbolID
Definition: SymExpr.h:113
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
unsigned computeComplexity() const 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:117
const SymExpr * getLHS() const
static void Profile(llvm::FoldingSetNodeID &ID, const SymExpr *lhs, BinaryOperator::Opcode op, const SymExpr *rhs, QualType t)