clang  6.0.0svn
ProgramState.cpp
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1 //= ProgramState.cpp - Path-Sensitive "State" for tracking 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 implements ProgramState and ProgramStateManager.
11 //
12 //===----------------------------------------------------------------------===//
13 
15 #include "clang/Analysis/CFG.h"
20 #include "llvm/Support/raw_ostream.h"
21 
22 using namespace clang;
23 using namespace ento;
24 
25 namespace clang { namespace ento {
26 /// Increments the number of times this state is referenced.
27 
29  ++const_cast<ProgramState*>(state)->refCount;
30 }
31 
32 /// Decrement the number of times this state is referenced.
34  assert(state->refCount > 0);
35  ProgramState *s = const_cast<ProgramState*>(state);
36  if (--s->refCount == 0) {
38  Mgr.StateSet.RemoveNode(s);
39  s->~ProgramState();
40  Mgr.freeStates.push_back(s);
41  }
42 }
43 }}
44 
46  StoreRef st, GenericDataMap gdm)
47  : stateMgr(mgr),
48  Env(env),
49  store(st.getStore()),
50  GDM(gdm),
51  refCount(0) {
52  stateMgr->getStoreManager().incrementReferenceCount(store);
53 }
54 
56  : llvm::FoldingSetNode(),
57  stateMgr(RHS.stateMgr),
58  Env(RHS.Env),
59  store(RHS.store),
60  GDM(RHS.GDM),
61  refCount(0) {
62  stateMgr->getStoreManager().incrementReferenceCount(store);
63 }
64 
66  if (store)
67  stateMgr->getStoreManager().decrementReferenceCount(store);
68 }
69 
71  StoreManagerCreator CreateSMgr,
72  ConstraintManagerCreator CreateCMgr,
73  llvm::BumpPtrAllocator &alloc,
74  SubEngine *SubEng)
75  : Eng(SubEng), EnvMgr(alloc), GDMFactory(alloc),
76  svalBuilder(createSimpleSValBuilder(alloc, Ctx, *this)),
77  CallEventMgr(new CallEventManager(alloc)), Alloc(alloc) {
78  StoreMgr = (*CreateSMgr)(*this);
79  ConstraintMgr = (*CreateCMgr)(*this, SubEng);
80 }
81 
82 
84  for (GDMContextsTy::iterator I=GDMContexts.begin(), E=GDMContexts.end();
85  I!=E; ++I)
86  I->second.second(I->second.first);
87 }
88 
91  const StackFrameContext *LCtx,
92  SymbolReaper& SymReaper) {
93 
94  // This code essentially performs a "mark-and-sweep" of the VariableBindings.
95  // The roots are any Block-level exprs and Decls that our liveness algorithm
96  // tells us are live. We then see what Decls they may reference, and keep
97  // those around. This code more than likely can be made faster, and the
98  // frequency of which this method is called should be experimented with
99  // for optimum performance.
100  ProgramState NewState = *state;
101 
102  NewState.Env = EnvMgr.removeDeadBindings(NewState.Env, SymReaper, state);
103 
104  // Clean up the store.
105  StoreRef newStore = StoreMgr->removeDeadBindings(NewState.getStore(), LCtx,
106  SymReaper);
107  NewState.setStore(newStore);
108  SymReaper.setReapedStore(newStore);
109 
110  ProgramStateRef Result = getPersistentState(NewState);
111  return ConstraintMgr->removeDeadBindings(Result, SymReaper);
112 }
113 
115  SVal V,
116  const LocationContext *LCtx,
117  bool notifyChanges) const {
118  ProgramStateManager &Mgr = getStateManager();
119  ProgramStateRef newState = makeWithStore(Mgr.StoreMgr->Bind(getStore(),
120  LV, V));
121  const MemRegion *MR = LV.getAsRegion();
122  if (MR && Mgr.getOwningEngine() && notifyChanges)
123  return Mgr.getOwningEngine()->processRegionChange(newState, MR, LCtx);
124 
125  return newState;
126 }
127 
129  SVal V,
130  const LocationContext *LCtx) const {
131  ProgramStateManager &Mgr = getStateManager();
132  const MemRegion *R = loc.castAs<loc::MemRegionVal>().getRegion();
133  const StoreRef &newStore = Mgr.StoreMgr->BindDefault(getStore(), R, V);
134  ProgramStateRef new_state = makeWithStore(newStore);
135  return Mgr.getOwningEngine() ?
136  Mgr.getOwningEngine()->processRegionChange(new_state, R, LCtx) :
137  new_state;
138 }
139 
142 
145  const Expr *E, unsigned Count,
146  const LocationContext *LCtx,
147  bool CausedByPointerEscape,
148  InvalidatedSymbols *IS,
149  const CallEvent *Call,
150  RegionAndSymbolInvalidationTraits *ITraits) const {
151  SmallVector<SVal, 8> Values;
152  for (RegionList::const_iterator I = Regions.begin(),
153  End = Regions.end(); I != End; ++I)
154  Values.push_back(loc::MemRegionVal(*I));
155 
156  return invalidateRegionsImpl(Values, E, Count, LCtx, CausedByPointerEscape,
157  IS, ITraits, Call);
158 }
159 
162  const Expr *E, unsigned Count,
163  const LocationContext *LCtx,
164  bool CausedByPointerEscape,
165  InvalidatedSymbols *IS,
166  const CallEvent *Call,
167  RegionAndSymbolInvalidationTraits *ITraits) const {
168 
169  return invalidateRegionsImpl(Values, E, Count, LCtx, CausedByPointerEscape,
170  IS, ITraits, Call);
171 }
172 
174 ProgramState::invalidateRegionsImpl(ValueList Values,
175  const Expr *E, unsigned Count,
176  const LocationContext *LCtx,
177  bool CausedByPointerEscape,
178  InvalidatedSymbols *IS,
180  const CallEvent *Call) const {
181  ProgramStateManager &Mgr = getStateManager();
182  SubEngine* Eng = Mgr.getOwningEngine();
183 
184  InvalidatedSymbols Invalidated;
185  if (!IS)
186  IS = &Invalidated;
187 
189  if (!ITraits)
190  ITraits = &ITraitsLocal;
191 
192  if (Eng) {
193  StoreManager::InvalidatedRegions TopLevelInvalidated;
195  const StoreRef &newStore
196  = Mgr.StoreMgr->invalidateRegions(getStore(), Values, E, Count, LCtx, Call,
197  *IS, *ITraits, &TopLevelInvalidated,
198  &Invalidated);
199 
200  ProgramStateRef newState = makeWithStore(newStore);
201 
202  if (CausedByPointerEscape) {
203  newState = Eng->notifyCheckersOfPointerEscape(newState, IS,
204  TopLevelInvalidated,
205  Invalidated, Call,
206  *ITraits);
207  }
208 
209  return Eng->processRegionChanges(newState, IS, TopLevelInvalidated,
210  Invalidated, LCtx, Call);
211  }
212 
213  const StoreRef &newStore =
214  Mgr.StoreMgr->invalidateRegions(getStore(), Values, E, Count, LCtx, Call,
215  *IS, *ITraits, nullptr, nullptr);
216  return makeWithStore(newStore);
217 }
218 
220  assert(!LV.getAs<loc::MemRegionVal>() && "Use invalidateRegion instead.");
221 
222  Store OldStore = getStore();
223  const StoreRef &newStore =
224  getStateManager().StoreMgr->killBinding(OldStore, LV);
225 
226  if (newStore.getStore() == OldStore)
227  return this;
228 
229  return makeWithStore(newStore);
230 }
231 
234  const StackFrameContext *CalleeCtx) const {
235  const StoreRef &NewStore =
236  getStateManager().StoreMgr->enterStackFrame(getStore(), Call, CalleeCtx);
237  return makeWithStore(NewStore);
238 }
239 
241  // We only want to do fetches from regions that we can actually bind
242  // values. For example, SymbolicRegions of type 'id<...>' cannot
243  // have direct bindings (but their can be bindings on their subregions).
244  if (!R->isBoundable())
245  return UnknownVal();
246 
247  if (const TypedValueRegion *TR = dyn_cast<TypedValueRegion>(R)) {
248  QualType T = TR->getValueType();
250  return getSVal(R);
251  }
252 
253  return UnknownVal();
254 }
255 
257  SVal V = getRawSVal(cast<Loc>(location), T);
258 
259  // If 'V' is a symbolic value that is *perfectly* constrained to
260  // be a constant value, use that value instead to lessen the burden
261  // on later analysis stages (so we have less symbolic values to reason
262  // about).
263  if (!T.isNull()) {
264  if (SymbolRef sym = V.getAsSymbol()) {
265  if (const llvm::APSInt *Int = getStateManager()
266  .getConstraintManager()
267  .getSymVal(this, sym)) {
268  // FIXME: Because we don't correctly model (yet) sign-extension
269  // and truncation of symbolic values, we need to convert
270  // the integer value to the correct signedness and bitwidth.
271  //
272  // This shows up in the following:
273  //
274  // char foo();
275  // unsigned x = foo();
276  // if (x == 54)
277  // ...
278  //
279  // The symbolic value stored to 'x' is actually the conjured
280  // symbol for the call to foo(); the type of that symbol is 'char',
281  // not unsigned.
282  const llvm::APSInt &NewV = getBasicVals().Convert(T, *Int);
283 
284  if (V.getAs<Loc>())
285  return loc::ConcreteInt(NewV);
286  else
287  return nonloc::ConcreteInt(NewV);
288  }
289  }
290  }
291 
292  return V;
293 }
294 
296  const LocationContext *LCtx,
297  SVal V, bool Invalidate) const{
298  Environment NewEnv =
299  getStateManager().EnvMgr.bindExpr(Env, EnvironmentEntry(S, LCtx), V,
300  Invalidate);
301  if (NewEnv == Env)
302  return this;
303 
304  ProgramState NewSt = *this;
305  NewSt.Env = NewEnv;
306  return getStateManager().getPersistentState(NewSt);
307 }
308 
310  DefinedOrUnknownSVal UpperBound,
311  bool Assumption,
312  QualType indexTy) const {
313  if (Idx.isUnknown() || UpperBound.isUnknown())
314  return this;
315 
316  // Build an expression for 0 <= Idx < UpperBound.
317  // This is the same as Idx + MIN < UpperBound + MIN, if overflow is allowed.
318  // FIXME: This should probably be part of SValBuilder.
319  ProgramStateManager &SM = getStateManager();
320  SValBuilder &svalBuilder = SM.getSValBuilder();
321  ASTContext &Ctx = svalBuilder.getContext();
322 
323  // Get the offset: the minimum value of the array index type.
324  BasicValueFactory &BVF = svalBuilder.getBasicValueFactory();
325  // FIXME: This should be using ValueManager::ArrayindexTy...somehow.
326  if (indexTy.isNull())
327  indexTy = Ctx.IntTy;
328  nonloc::ConcreteInt Min(BVF.getMinValue(indexTy));
329 
330  // Adjust the index.
331  SVal newIdx = svalBuilder.evalBinOpNN(this, BO_Add,
332  Idx.castAs<NonLoc>(), Min, indexTy);
333  if (newIdx.isUnknownOrUndef())
334  return this;
335 
336  // Adjust the upper bound.
337  SVal newBound =
338  svalBuilder.evalBinOpNN(this, BO_Add, UpperBound.castAs<NonLoc>(),
339  Min, indexTy);
340 
341  if (newBound.isUnknownOrUndef())
342  return this;
343 
344  // Build the actual comparison.
345  SVal inBound = svalBuilder.evalBinOpNN(this, BO_LT, newIdx.castAs<NonLoc>(),
346  newBound.castAs<NonLoc>(), Ctx.IntTy);
347  if (inBound.isUnknownOrUndef())
348  return this;
349 
350  // Finally, let the constraint manager take care of it.
352  return CM.assume(this, inBound.castAs<DefinedSVal>(), Assumption);
353 }
354 
356  if (V.isZeroConstant())
357  return true;
358 
359  if (V.isConstant())
360  return false;
361 
362  SymbolRef Sym = V.getAsSymbol(/* IncludeBaseRegion */ true);
363  if (!Sym)
364  return ConditionTruthVal();
365 
366  return getStateManager().ConstraintMgr->isNull(this, Sym);
367 }
368 
370  ProgramState State(this,
371  EnvMgr.getInitialEnvironment(),
372  StoreMgr->getInitialStore(InitLoc),
373  GDMFactory.getEmptyMap());
374 
375  return getPersistentState(State);
376 }
377 
379  ProgramStateRef FromState,
380  ProgramStateRef GDMState) {
381  ProgramState NewState(*FromState);
382  NewState.GDM = GDMState->GDM;
383  return getPersistentState(NewState);
384 }
385 
387 
388  llvm::FoldingSetNodeID ID;
389  State.Profile(ID);
390  void *InsertPos;
391 
392  if (ProgramState *I = StateSet.FindNodeOrInsertPos(ID, InsertPos))
393  return I;
394 
395  ProgramState *newState = nullptr;
396  if (!freeStates.empty()) {
397  newState = freeStates.back();
398  freeStates.pop_back();
399  }
400  else {
401  newState = (ProgramState*) Alloc.Allocate<ProgramState>();
402  }
403  new (newState) ProgramState(State);
404  StateSet.InsertNode(newState, InsertPos);
405  return newState;
406 }
407 
408 ProgramStateRef ProgramState::makeWithStore(const StoreRef &store) const {
409  ProgramState NewSt(*this);
410  NewSt.setStore(store);
411  return getStateManager().getPersistentState(NewSt);
412 }
413 
414 void ProgramState::setStore(const StoreRef &newStore) {
415  Store newStoreStore = newStore.getStore();
416  if (newStoreStore)
417  stateMgr->getStoreManager().incrementReferenceCount(newStoreStore);
418  if (store)
419  stateMgr->getStoreManager().decrementReferenceCount(store);
420  store = newStoreStore;
421 }
422 
423 //===----------------------------------------------------------------------===//
424 // State pretty-printing.
425 //===----------------------------------------------------------------------===//
426 
427 void ProgramState::print(raw_ostream &Out,
428  const char *NL, const char *Sep) const {
429  // Print the store.
430  ProgramStateManager &Mgr = getStateManager();
431  Mgr.getStoreManager().print(getStore(), Out, NL, Sep);
432 
433  // Print out the environment.
434  Env.print(Out, NL, Sep);
435 
436  // Print out the constraints.
437  Mgr.getConstraintManager().print(this, Out, NL, Sep);
438 
439  // Print checker-specific data.
440  Mgr.getOwningEngine()->printState(Out, this, NL, Sep);
441 }
442 
443 void ProgramState::printDOT(raw_ostream &Out) const {
444  print(Out, "\\l", "\\|");
445 }
446 
447 LLVM_DUMP_METHOD void ProgramState::dump() const {
448  print(llvm::errs());
449 }
450 
451 void ProgramState::printTaint(raw_ostream &Out,
452  const char *NL, const char *Sep) const {
453  TaintMapImpl TM = get<TaintMap>();
454 
455  if (!TM.isEmpty())
456  Out <<"Tainted Symbols:" << NL;
457 
458  for (TaintMapImpl::iterator I = TM.begin(), E = TM.end(); I != E; ++I) {
459  Out << I->first << " : " << I->second << NL;
460  }
461 }
462 
464  printTaint(llvm::errs());
465 }
466 
467 //===----------------------------------------------------------------------===//
468 // Generic Data Map.
469 //===----------------------------------------------------------------------===//
470 
471 void *const* ProgramState::FindGDM(void *K) const {
472  return GDM.lookup(K);
473 }
474 
475 void*
477  void *(*CreateContext)(llvm::BumpPtrAllocator&),
478  void (*DeleteContext)(void*)) {
479 
480  std::pair<void*, void (*)(void*)>& p = GDMContexts[K];
481  if (!p.first) {
482  p.first = CreateContext(Alloc);
483  p.second = DeleteContext;
484  }
485 
486  return p.first;
487 }
488 
490  ProgramState::GenericDataMap M1 = St->getGDM();
491  ProgramState::GenericDataMap M2 = GDMFactory.add(M1, Key, Data);
492 
493  if (M1 == M2)
494  return St;
495 
496  ProgramState NewSt = *St;
497  NewSt.GDM = M2;
498  return getPersistentState(NewSt);
499 }
500 
502  ProgramState::GenericDataMap OldM = state->getGDM();
503  ProgramState::GenericDataMap NewM = GDMFactory.remove(OldM, Key);
504 
505  if (NewM == OldM)
506  return state;
507 
508  ProgramState NewState = *state;
509  NewState.GDM = NewM;
510  return getPersistentState(NewState);
511 }
512 
514  bool wasVisited = !visited.insert(val.getCVData()).second;
515  if (wasVisited)
516  return true;
517 
518  StoreManager &StoreMgr = state->getStateManager().getStoreManager();
519  // FIXME: We don't really want to use getBaseRegion() here because pointer
520  // arithmetic doesn't apply, but scanReachableSymbols only accepts base
521  // regions right now.
522  const MemRegion *R = val.getRegion()->getBaseRegion();
523  return StoreMgr.scanReachableSymbols(val.getStore(), R, *this);
524 }
525 
527  for (nonloc::CompoundVal::iterator I=val.begin(), E=val.end(); I!=E; ++I)
528  if (!scan(*I))
529  return false;
530 
531  return true;
532 }
533 
535  for (SymExpr::symbol_iterator SI = sym->symbol_begin(),
536  SE = sym->symbol_end();
537  SI != SE; ++SI) {
538  bool wasVisited = !visited.insert(*SI).second;
539  if (wasVisited)
540  continue;
541 
542  if (!visitor.VisitSymbol(*SI))
543  return false;
544  }
545 
546  return true;
547 }
548 
551  return scan(X->getRegion());
552 
555  return scan(*X);
556 
558  return scan(X->getLoc());
559 
560  if (SymbolRef Sym = val.getAsSymbol())
561  return scan(Sym);
562 
563  if (const SymExpr *Sym = val.getAsSymbolicExpression())
564  return scan(Sym);
565 
567  return scan(*X);
568 
569  return true;
570 }
571 
573  if (isa<MemSpaceRegion>(R))
574  return true;
575 
576  bool wasVisited = !visited.insert(R).second;
577  if (wasVisited)
578  return true;
579 
580  if (!visitor.VisitMemRegion(R))
581  return false;
582 
583  // If this is a symbolic region, visit the symbol for the region.
584  if (const SymbolicRegion *SR = dyn_cast<SymbolicRegion>(R))
585  if (!visitor.VisitSymbol(SR->getSymbol()))
586  return false;
587 
588  // If this is a subregion, also visit the parent regions.
589  if (const SubRegion *SR = dyn_cast<SubRegion>(R)) {
590  const MemRegion *Super = SR->getSuperRegion();
591  if (!scan(Super))
592  return false;
593 
594  // When we reach the topmost region, scan all symbols in it.
595  if (isa<MemSpaceRegion>(Super)) {
596  StoreManager &StoreMgr = state->getStateManager().getStoreManager();
597  if (!StoreMgr.scanReachableSymbols(state->getStore(), SR, *this))
598  return false;
599  }
600  }
601 
602  // Regions captured by a block are also implicitly reachable.
603  if (const BlockDataRegion *BDR = dyn_cast<BlockDataRegion>(R)) {
604  BlockDataRegion::referenced_vars_iterator I = BDR->referenced_vars_begin(),
605  E = BDR->referenced_vars_end();
606  for ( ; I != E; ++I) {
607  if (!scan(I.getCapturedRegion()))
608  return false;
609  }
610  }
611 
612  return true;
613 }
614 
616  ScanReachableSymbols S(this, visitor);
617  return S.scan(val);
618 }
619 
621  SymbolVisitor &visitor) const {
622  ScanReachableSymbols S(this, visitor);
623  for ( ; I != E; ++I) {
624  if (!S.scan(*I))
625  return false;
626  }
627  return true;
628 }
629 
631  const MemRegion * const *E,
632  SymbolVisitor &visitor) const {
633  ScanReachableSymbols S(this, visitor);
634  for ( ; I != E; ++I) {
635  if (!S.scan(*I))
636  return false;
637  }
638  return true;
639 }
640 
642  const LocationContext *LCtx,
643  TaintTagType Kind) const {
644  if (const Expr *E = dyn_cast_or_null<Expr>(S))
645  S = E->IgnoreParens();
646 
647  return addTaint(getSVal(S, LCtx), Kind);
648 }
649 
651  TaintTagType Kind) const {
652  SymbolRef Sym = V.getAsSymbol();
653  if (Sym)
654  return addTaint(Sym, Kind);
655 
656  // If the SVal represents a structure, try to mass-taint all values within the
657  // structure. For now it only works efficiently on lazy compound values that
658  // were conjured during a conservative evaluation of a function - either as
659  // return values of functions that return structures or arrays by value, or as
660  // values of structures or arrays passed into the function by reference,
661  // directly or through pointer aliasing. Such lazy compound values are
662  // characterized by having exactly one binding in their captured store within
663  // their parent region, which is a conjured symbol default-bound to the base
664  // region of the parent region.
665  if (auto LCV = V.getAs<nonloc::LazyCompoundVal>()) {
666  if (Optional<SVal> binding = getStateManager().StoreMgr->getDefaultBinding(*LCV)) {
667  if (SymbolRef Sym = binding->getAsSymbol())
668  return addPartialTaint(Sym, LCV->getRegion(), Kind);
669  }
670  }
671 
672  const MemRegion *R = V.getAsRegion();
673  return addTaint(R, Kind);
674 }
675 
677  TaintTagType Kind) const {
678  if (const SymbolicRegion *SR = dyn_cast_or_null<SymbolicRegion>(R))
679  return addTaint(SR->getSymbol(), Kind);
680  return this;
681 }
682 
684  TaintTagType Kind) const {
685  // If this is a symbol cast, remove the cast before adding the taint. Taint
686  // is cast agnostic.
687  while (const SymbolCast *SC = dyn_cast<SymbolCast>(Sym))
688  Sym = SC->getOperand();
689 
690  ProgramStateRef NewState = set<TaintMap>(Sym, Kind);
691  assert(NewState);
692  return NewState;
693 }
694 
696  const SubRegion *SubRegion,
697  TaintTagType Kind) const {
698  // Ignore partial taint if the entire parent symbol is already tainted.
699  if (contains<TaintMap>(ParentSym) && *get<TaintMap>(ParentSym) == Kind)
700  return this;
701 
702  // Partial taint applies if only a portion of the symbol is tainted.
703  if (SubRegion == SubRegion->getBaseRegion())
704  return addTaint(ParentSym, Kind);
705 
706  const TaintedSubRegions *SavedRegs = get<DerivedSymTaint>(ParentSym);
707  TaintedSubRegions Regs =
708  SavedRegs ? *SavedRegs : stateMgr->TSRFactory.getEmptyMap();
709 
710  Regs = stateMgr->TSRFactory.add(Regs, SubRegion, Kind);
711  ProgramStateRef NewState = set<DerivedSymTaint>(ParentSym, Regs);
712  assert(NewState);
713  return NewState;
714 }
715 
716 bool ProgramState::isTainted(const Stmt *S, const LocationContext *LCtx,
717  TaintTagType Kind) const {
718  if (const Expr *E = dyn_cast_or_null<Expr>(S))
719  S = E->IgnoreParens();
720 
721  SVal val = getSVal(S, LCtx);
722  return isTainted(val, Kind);
723 }
724 
726  if (const SymExpr *Sym = V.getAsSymExpr())
727  return isTainted(Sym, Kind);
728  if (const MemRegion *Reg = V.getAsRegion())
729  return isTainted(Reg, Kind);
730  return false;
731 }
732 
733 bool ProgramState::isTainted(const MemRegion *Reg, TaintTagType K) const {
734  if (!Reg)
735  return false;
736 
737  // Element region (array element) is tainted if either the base or the offset
738  // are tainted.
739  if (const ElementRegion *ER = dyn_cast<ElementRegion>(Reg))
740  return isTainted(ER->getSuperRegion(), K) || isTainted(ER->getIndex(), K);
741 
742  if (const SymbolicRegion *SR = dyn_cast<SymbolicRegion>(Reg))
743  return isTainted(SR->getSymbol(), K);
744 
745  if (const SubRegion *ER = dyn_cast<SubRegion>(Reg))
746  return isTainted(ER->getSuperRegion(), K);
747 
748  return false;
749 }
750 
752  if (!Sym)
753  return false;
754 
755  // Traverse all the symbols this symbol depends on to see if any are tainted.
756  for (SymExpr::symbol_iterator SI = Sym->symbol_begin(), SE =Sym->symbol_end();
757  SI != SE; ++SI) {
758  if (!isa<SymbolData>(*SI))
759  continue;
760 
761  if (const TaintTagType *Tag = get<TaintMap>(*SI)) {
762  if (*Tag == Kind)
763  return true;
764  }
765 
766  if (const SymbolDerived *SD = dyn_cast<SymbolDerived>(*SI)) {
767  // If this is a SymbolDerived with a tainted parent, it's also tainted.
768  if (isTainted(SD->getParentSymbol(), Kind))
769  return true;
770 
771  // If this is a SymbolDerived with the same parent symbol as another
772  // tainted SymbolDerived and a region that's a sub-region of that tainted
773  // symbol, it's also tainted.
774  if (const TaintedSubRegions *Regs =
775  get<DerivedSymTaint>(SD->getParentSymbol())) {
776  const TypedValueRegion *R = SD->getRegion();
777  for (auto I : *Regs) {
778  // FIXME: The logic to identify tainted regions could be more
779  // complete. For example, this would not currently identify
780  // overlapping fields in a union as tainted. To identify this we can
781  // check for overlapping/nested byte offsets.
782  if (Kind == I.second &&
783  (R == I.first || R->isSubRegionOf(I.first)))
784  return true;
785  }
786  }
787  }
788 
789  // If memory region is tainted, data is also tainted.
790  if (const SymbolRegionValue *SRV = dyn_cast<SymbolRegionValue>(*SI)) {
791  if (isTainted(SRV->getRegion(), Kind))
792  return true;
793  }
794 
795  // If this is a SymbolCast from a tainted value, it's also tainted.
796  if (const SymbolCast *SC = dyn_cast<SymbolCast>(*SI)) {
797  if (isTainted(SC->getOperand(), Kind))
798  return true;
799  }
800  }
801 
802  return false;
803 }
804 
virtual ProgramStateRef assume(ProgramStateRef state, DefinedSVal Cond, bool Assumption)=0
ProgramStateRef addPartialTaint(SymbolRef ParentSym, const SubRegion *SubRegion, TaintTagType Kind=TaintTagGeneric) const
Create a new state in a which a sub-region of a given symbol is tainted.
ProgramStateRef addGDM(ProgramStateRef St, void *Key, void *Data)
TypedValueRegion - An abstract class representing regions having a typed value.
Definition: MemRegion.h:511
ProgramStateRef processRegionChange(ProgramStateRef state, const MemRegion *MR, const LocationContext *LCtx)
Definition: SubEngine.h:139
if(T->getSizeExpr()) TRY_TO(TraverseStmt(T -> getSizeExpr()))
A (possibly-)qualified type.
Definition: Type.h:614
MemRegion - The root abstract class for all memory regions.
Definition: MemRegion.h:79
Store getStore() const
Definition: StoreRef.h:46
ProgramStateRef enterStackFrame(const CallEvent &Call, const StackFrameContext *CalleeCtx) const
enterStackFrame - Returns the state for entry to the given stack frame, preserving the current state...
DominatorTree GraphTraits specialization so the DominatorTree can be iterable by generic graph iterat...
Definition: Dominators.h:26
SValBuilder * createSimpleSValBuilder(llvm::BumpPtrAllocator &alloc, ASTContext &context, ProgramStateManager &stateMgr)
Stmt - This represents one statement.
Definition: Stmt.h:60
Information about invalidation for a particular region/symbol.
Definition: MemRegion.h:1383
BasicValueFactory & getBasicVals()
Definition: ProgramState.h:503
Manages the lifetime of CallEvent objects.
Definition: CallEvent.h:982
const void * Store
Store - This opaque type encapsulates an immutable mapping from locations to values.
Definition: StoreRef.h:26
bool isTainted(const Stmt *S, const LocationContext *LCtx, TaintTagType Kind=TaintTagGeneric) const
Check if the statement is tainted in the current state.
Value representing integer constant.
Definition: SVals.h:352
A utility class that visits the reachable symbols using a custom SymbolVisitor.
Definition: ProgramState.h:844
void print(raw_ostream &Out, const char *nl="\, const char *sep="") const
ProgramStateRef removeDeadBindings(ProgramStateRef St, const StackFrameContext *LCtx, SymbolReaper &SymReaper)
Store getStore() const
Return the store associated with this state.
Definition: ProgramState.h:123
Symbolic value.
Definition: SymExpr.h:29
Holds long-lived AST nodes (such as types and decls) that can be referred to throughout the semantic ...
Definition: ASTContext.h:128
LineState State
std::unique_ptr< StoreManager >(* StoreManagerCreator)(ProgramStateManager &)
Definition: ProgramState.h:44
symbol_iterator symbol_begin() const
Definition: SymExpr.h:83
i32 captured_struct **param SharedsTy A type which contains references the shared variables *param Shareds Context with the list of shared variables from the p *TaskFunction *param Data Additional data for task generation like final * state
const SymExpr * getAsSymbolicExpression() const
getAsSymbolicExpression - If this Sval wraps a symbolic expression then return that expression...
Definition: SVals.cpp:126
void setReapedStore(StoreRef st)
Set to the value of the symbolic store after StoreManager::removeDeadBindings has been called...
bool isIntegralOrEnumerationType() const
Determine whether this type is an integral or enumeration type.
Definition: Type.h:6013
const llvm::APSInt & Convert(const llvm::APSInt &To, const llvm::APSInt &From)
Convert - Create a new persistent APSInt with the same value as &#39;From&#39; but with the bitwidth and sign...
static bool isLocType(QualType T)
Definition: SVals.h:307
ProgramStateManager & getStateManager() const
Return the ProgramStateManager associated with this state.
Definition: ProgramState.h:110
BlockDataRegion - A region that represents a block instance.
Definition: MemRegion.h:656
bool scanReachableSymbols(SVal val, SymbolVisitor &visitor) const
Visits the symbols reachable from the given SVal using the provided SymbolVisitor.
bool isUnknown() const
Definition: SVals.h:128
virtual void decrementReferenceCount(Store store)
If the StoreManager supports it, decrement the reference count of the specified Store object...
Definition: Store.h:183
const LazyCompoundValData * getCVData() const
Definition: SVals.h:459
A symbol representing the value of a MemRegion whose parent region has symbolic value.
bool isConstant() const
Definition: SVals.cpp:207
SVal getSVal(const Stmt *S, const LocationContext *LCtx) const
Returns the SVal bound to the statement &#39;S&#39; in the state&#39;s environment.
Definition: ProgramState.h:738
ProgramStateRef bindLoc(Loc location, SVal V, const LocationContext *LCtx, bool notifyChanges=true) const
virtual void print(ProgramStateRef state, raw_ostream &Out, const char *nl, const char *sep)=0
SymbolRef getAsSymbol(bool IncludeBaseRegions=false) const
If this SVal wraps a symbol return that SymbolRef.
Definition: SVals.cpp:116
void printDOT(raw_ostream &Out) const
llvm::ImmutableList< SVal >::iterator iterator
Definition: SVals.h:437
std::unique_ptr< ConstraintManager >(* ConstraintManagerCreator)(ProgramStateManager &, SubEngine *)
Definition: ProgramState.h:42
ProgramStateRef BindExpr(const Stmt *S, const LocationContext *LCtx, SVal V, bool Invalidate=true) const
Create a new state by binding the value &#39;V&#39; to the statement &#39;S&#39; in the state&#39;s environment.
SymbolicRegion - A special, "non-concrete" region.
Definition: MemRegion.h:742
unsigned TaintTagType
The type of taint, which helps to differentiate between different types of taint. ...
Definition: TaintTag.h:22
ProgramState - This class encapsulates:
Definition: ProgramState.h:74
Expr - This represents one expression.
Definition: Expr.h:106
SourceLocation End
const FunctionProtoType * T
Represents a cast expression.
ConditionTruthVal isNull(SVal V) const
Check if the given SVal is constrained to zero or is a zero constant.
bool isNull() const
Return true if this QualType doesn&#39;t point to a type yet.
Definition: Type.h:681
const SourceManager & SM
Definition: Format.cpp:1308
void *const * FindGDM(void *K) const
Optional< T > getAs() const
Convert to the specified SVal type, returning None if this SVal is not of the desired type...
Definition: SVals.h:100
virtual bool isBoundable() const
Definition: MemRegion.h:152
ProgramStateRef removeGDM(ProgramStateRef state, void *Key)
bool scan(nonloc::LazyCompoundVal val)
Kind
ProgramStateRef getInitialState(const LocationContext *InitLoc)
ProgramStateRef invalidateRegions(ArrayRef< const MemRegion *> Regions, const Expr *E, unsigned BlockCount, const LocationContext *LCtx, bool CausesPointerEscape, InvalidatedSymbols *IS=nullptr, const CallEvent *Call=nullptr, RegionAndSymbolInvalidationTraits *ITraits=nullptr) const
Returns the state with bindings for the given regions cleared from the store.
const MemRegion * getAsRegion() const
Definition: SVals.cpp:140
bool isSubRegionOf(const MemRegion *R) const override
Check if the region is a subregion of the given region.
Definition: MemRegion.cpp:105
An entry in the environment consists of a Stmt and an LocationContext.
Definition: Environment.h:35
ASTContext & getContext()
Definition: SValBuilder.h:131
SVal - This represents a symbolic expression, which can be either an L-value or an R-value...
Definition: SVals.h:63
virtual ProgramStateRef processRegionChanges(ProgramStateRef state, const InvalidatedSymbols *invalidated, ArrayRef< const MemRegion *> ExplicitRegions, ArrayRef< const MemRegion *> Regions, const LocationContext *LCtx, const CallEvent *Call)=0
processRegionChanges - Called by ProgramStateManager whenever a change is made to the store...
A class responsible for cleaning up unused symbols.
ProgramStateRef getPersistentStateWithGDM(ProgramStateRef FromState, ProgramStateRef GDMState)
ProgramStateRef bindDefault(SVal loc, SVal V, const LocationContext *LCtx) const
virtual SVal evalBinOpNN(ProgramStateRef state, BinaryOperator::Opcode op, NonLoc lhs, NonLoc rhs, QualType resultTy)=0
Create a new value which represents a binary expression with two non- location operands.
An immutable map from EnvironemntEntries to SVals.
Definition: Environment.h:56
A symbol representing the value stored at a MemRegion.
Definition: SymbolManager.h:42
Dataflow Directional Tag Classes.
void ProgramStateRelease(const ProgramState *state)
Decrement the number of times this state is referenced.
ArrayRef< const MemRegion * > RegionList
bool isZeroConstant() const
Definition: SVals.cpp:219
static symbol_iterator symbol_end()
Definition: SymExpr.h:84
ProgramStateRef killBinding(Loc LV) const
const void * getStore() const
Definition: SVals.cpp:155
void printTaint(raw_ostream &Out, const char *nl="\, const char *sep="") const
virtual void print(Store store, raw_ostream &Out, const char *nl, const char *sep)=0
Represents an abstract call to a function or method along a particular path.
Definition: CallEvent.h:140
virtual bool scanReachableSymbols(Store S, const MemRegion *R, ScanReachableSymbols &Visitor)=0
Finds the transitive closure of symbols within the given region.
const llvm::APSInt & getMinValue(const llvm::APSInt &v)
ConstraintManager & getConstraintManager()
Definition: ProgramState.h:530
T castAs() const
Convert to the specified SVal type, asserting that this SVal is of the desired type.
Definition: SVals.h:92
BasicValueFactory & getBasicValueFactory()
Definition: SValBuilder.h:144
SubRegion - A region that subsets another larger region.
Definition: MemRegion.h:419
ProgramState(ProgramStateManager *mgr, const Environment &env, StoreRef st, GenericDataMap gdm)
This ctor is used when creating the first ProgramState object.
void ProgramStateRetain(const ProgramState *state)
Increments the number of times this state is referenced.
const SymExpr * getAsSymExpr() const
Definition: SVals.cpp:133
ProgramStateRef addTaint(const Stmt *S, const LocationContext *LCtx, TaintTagType Kind=TaintTagGeneric) const
Create a new state in which the statement is marked as tainted.
X
Add a minimal nested name specifier fixit hint to allow lookup of a tag name from an outer enclosing ...
Definition: SemaDecl.cpp:13161
ProgramStateManager(ASTContext &Ctx, StoreManagerCreator CreateStoreManager, ConstraintManagerCreator CreateConstraintManager, llvm::BumpPtrAllocator &alloc, SubEngine *subeng)
const TypedValueRegion * getRegion() const
Definition: SVals.cpp:159
Environment removeDeadBindings(Environment Env, SymbolReaper &SymReaper, ProgramStateRef state)
void * FindGDMContext(void *index, void *(*CreateContext)(llvm::BumpPtrAllocator &), void(*DeleteContext)(void *))
const MemRegion * getBaseRegion() const
Definition: MemRegion.cpp:1091
virtual void incrementReferenceCount(Store store)
If the StoreManager supports it, increment the reference count of the specified Store object...
Definition: Store.h:178
virtual ProgramStateRef notifyCheckersOfPointerEscape(ProgramStateRef State, const InvalidatedSymbols *Invalidated, ArrayRef< const MemRegion *> ExplicitRegions, ArrayRef< const MemRegion *> Regions, const CallEvent *Call, RegionAndSymbolInvalidationTraits &HTraits)=0
ElementRegin is used to represent both array elements and casts.
Definition: MemRegion.h:1066
CanQualType IntTy
Definition: ASTContext.h:973
virtual void printState(raw_ostream &Out, ProgramStateRef State, const char *NL, const char *Sep)=0
printState - Called by ProgramStateManager to print checker-specific data.
static void Profile(llvm::FoldingSetNodeID &ID, const ProgramState *V)
Profile - Profile the contents of a ProgramState object for use in a FoldingSet.
Definition: ProgramState.h:134
ProgramStateRef assumeInBound(DefinedOrUnknownSVal idx, DefinedOrUnknownSVal upperBound, bool assumption, QualType IndexType=QualType()) const
ProgramStateRef getPersistentState(ProgramState &Impl)
SVal getSValAsScalarOrLoc(const Stmt *Ex, const LocationContext *LCtx) const
Definition: ProgramState.h:745
bool isUnknownOrUndef() const
Definition: SVals.h:136
ArrayRef< SVal > ValueList
Expr * IgnoreParens() LLVM_READONLY
IgnoreParens - Ignore parentheses.
Definition: Expr.cpp:2432
Iterator over symbols that the current symbol depends on.
Definition: SymExpr.h:68