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1 //= GRState.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 GRState and GRStateManager.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "clang/Analysis/CFG.h"
15 #include "clang/StaticAnalyzer/Core/PathSensitive/GRStateTrait.h"
16 #include "clang/StaticAnalyzer/Core/PathSensitive/GRState.h"
17 #include "clang/StaticAnalyzer/Core/PathSensitive/SubEngine.h"
18 #include "clang/StaticAnalyzer/Core/PathSensitive/TransferFuncs.h"
19 #include "llvm/Support/raw_ostream.h"
20 
21 using namespace clang;
22 using namespace ento;
23 
24 // Give the vtable for ConstraintManager somewhere to live.
25 // FIXME: Move this elsewhere.
~ConstraintManager()26 ConstraintManager::~ConstraintManager() {}
27 
GRState(GRStateManager * mgr,const Environment & env,StoreRef st,GenericDataMap gdm)28 GRState::GRState(GRStateManager *mgr, const Environment& env,
29                  StoreRef st, GenericDataMap gdm)
30   : stateMgr(mgr),
31     Env(env),
32     store(st.getStore()),
33     GDM(gdm),
34     refCount(0) {
35   stateMgr->getStoreManager().incrementReferenceCount(store);
36 }
37 
GRState(const GRState & RHS)38 GRState::GRState(const GRState& RHS)
39     : llvm::FoldingSetNode(),
40       stateMgr(RHS.stateMgr),
41       Env(RHS.Env),
42       store(RHS.store),
43       GDM(RHS.GDM),
44       refCount(0) {
45   stateMgr->getStoreManager().incrementReferenceCount(store);
46 }
47 
~GRState()48 GRState::~GRState() {
49   if (store)
50     stateMgr->getStoreManager().decrementReferenceCount(store);
51 }
52 
~GRStateManager()53 GRStateManager::~GRStateManager() {
54   for (std::vector<GRState::Printer*>::iterator I=Printers.begin(),
55         E=Printers.end(); I!=E; ++I)
56     delete *I;
57 
58   for (GDMContextsTy::iterator I=GDMContexts.begin(), E=GDMContexts.end();
59        I!=E; ++I)
60     I->second.second(I->second.first);
61 }
62 
63 const GRState*
removeDeadBindings(const GRState * state,const StackFrameContext * LCtx,SymbolReaper & SymReaper)64 GRStateManager::removeDeadBindings(const GRState* state,
65                                    const StackFrameContext *LCtx,
66                                    SymbolReaper& SymReaper) {
67 
68   // This code essentially performs a "mark-and-sweep" of the VariableBindings.
69   // The roots are any Block-level exprs and Decls that our liveness algorithm
70   // tells us are live.  We then see what Decls they may reference, and keep
71   // those around.  This code more than likely can be made faster, and the
72   // frequency of which this method is called should be experimented with
73   // for optimum performance.
74   llvm::SmallVector<const MemRegion*, 10> RegionRoots;
75   GRState NewState = *state;
76 
77   NewState.Env = EnvMgr.removeDeadBindings(NewState.Env, SymReaper,
78                                            state, RegionRoots);
79 
80   // Clean up the store.
81   NewState.setStore(StoreMgr->removeDeadBindings(NewState.getStore(), LCtx,
82                                                  SymReaper, RegionRoots));
83   state = getPersistentState(NewState);
84   return ConstraintMgr->removeDeadBindings(state, SymReaper);
85 }
86 
MarshalState(const GRState * state,const StackFrameContext * InitLoc)87 const GRState *GRStateManager::MarshalState(const GRState *state,
88                                             const StackFrameContext *InitLoc) {
89   // make up an empty state for now.
90   GRState State(this,
91                 EnvMgr.getInitialEnvironment(),
92                 StoreMgr->getInitialStore(InitLoc),
93                 GDMFactory.getEmptyMap());
94 
95   return getPersistentState(State);
96 }
97 
bindCompoundLiteral(const CompoundLiteralExpr * CL,const LocationContext * LC,SVal V) const98 const GRState *GRState::bindCompoundLiteral(const CompoundLiteralExpr* CL,
99                                             const LocationContext *LC,
100                                             SVal V) const {
101   const StoreRef &newStore =
102     getStateManager().StoreMgr->BindCompoundLiteral(getStore(), CL, LC, V);
103   return makeWithStore(newStore);
104 }
105 
bindDecl(const VarRegion * VR,SVal IVal) const106 const GRState *GRState::bindDecl(const VarRegion* VR, SVal IVal) const {
107   const StoreRef &newStore =
108     getStateManager().StoreMgr->BindDecl(getStore(), VR, IVal);
109   return makeWithStore(newStore);
110 }
111 
bindDeclWithNoInit(const VarRegion * VR) const112 const GRState *GRState::bindDeclWithNoInit(const VarRegion* VR) const {
113   const StoreRef &newStore =
114     getStateManager().StoreMgr->BindDeclWithNoInit(getStore(), VR);
115   return makeWithStore(newStore);
116 }
117 
bindLoc(Loc LV,SVal V) const118 const GRState *GRState::bindLoc(Loc LV, SVal V) const {
119   GRStateManager &Mgr = getStateManager();
120   const GRState *newState = makeWithStore(Mgr.StoreMgr->Bind(getStore(),
121                                                              LV, V));
122   const MemRegion *MR = LV.getAsRegion();
123   if (MR && Mgr.getOwningEngine())
124     return Mgr.getOwningEngine()->processRegionChange(newState, MR);
125 
126   return newState;
127 }
128 
bindDefault(SVal loc,SVal V) const129 const GRState *GRState::bindDefault(SVal loc, SVal V) const {
130   GRStateManager &Mgr = getStateManager();
131   const MemRegion *R = cast<loc::MemRegionVal>(loc).getRegion();
132   const StoreRef &newStore = Mgr.StoreMgr->BindDefault(getStore(), R, V);
133   const GRState *new_state = makeWithStore(newStore);
134   return Mgr.getOwningEngine() ?
135            Mgr.getOwningEngine()->processRegionChange(new_state, R) :
136            new_state;
137 }
138 
invalidateRegions(const MemRegion * const * Begin,const MemRegion * const * End,const Expr * E,unsigned Count,StoreManager::InvalidatedSymbols * IS,bool invalidateGlobals) const139 const GRState *GRState::invalidateRegions(const MemRegion * const *Begin,
140                                           const MemRegion * const *End,
141                                           const Expr *E, unsigned Count,
142                                           StoreManager::InvalidatedSymbols *IS,
143                                           bool invalidateGlobals) const {
144   if (!IS) {
145     StoreManager::InvalidatedSymbols invalidated;
146     return invalidateRegionsImpl(Begin, End, E, Count,
147                              invalidated, invalidateGlobals);
148   }
149   return invalidateRegionsImpl(Begin, End, E, Count, *IS, invalidateGlobals);
150 }
151 
152 const GRState *
invalidateRegionsImpl(const MemRegion * const * Begin,const MemRegion * const * End,const Expr * E,unsigned Count,StoreManager::InvalidatedSymbols & IS,bool invalidateGlobals) const153 GRState::invalidateRegionsImpl(const MemRegion * const *Begin,
154                                const MemRegion * const *End,
155                                const Expr *E, unsigned Count,
156                                StoreManager::InvalidatedSymbols &IS,
157                                bool invalidateGlobals) const {
158   GRStateManager &Mgr = getStateManager();
159   SubEngine* Eng = Mgr.getOwningEngine();
160 
161   if (Eng && Eng->wantsRegionChangeUpdate(this)) {
162     StoreManager::InvalidatedRegions Regions;
163     const StoreRef &newStore
164       = Mgr.StoreMgr->invalidateRegions(getStore(), Begin, End, E, Count, IS,
165                                         invalidateGlobals, &Regions);
166     const GRState *newState = makeWithStore(newStore);
167     return Eng->processRegionChanges(newState, &IS,
168                                      &Regions.front(),
169                                      &Regions.back()+1);
170   }
171 
172   const StoreRef &newStore =
173     Mgr.StoreMgr->invalidateRegions(getStore(), Begin, End, E, Count, IS,
174                                     invalidateGlobals, NULL);
175   return makeWithStore(newStore);
176 }
177 
unbindLoc(Loc LV) const178 const GRState *GRState::unbindLoc(Loc LV) const {
179   assert(!isa<loc::MemRegionVal>(LV) && "Use invalidateRegion instead.");
180 
181   Store OldStore = getStore();
182   const StoreRef &newStore = getStateManager().StoreMgr->Remove(OldStore, LV);
183 
184   if (newStore.getStore() == OldStore)
185     return this;
186 
187   return makeWithStore(newStore);
188 }
189 
enterStackFrame(const StackFrameContext * frame) const190 const GRState *GRState::enterStackFrame(const StackFrameContext *frame) const {
191   const StoreRef &new_store =
192     getStateManager().StoreMgr->enterStackFrame(this, frame);
193   return makeWithStore(new_store);
194 }
195 
getSValAsScalarOrLoc(const MemRegion * R) const196 SVal GRState::getSValAsScalarOrLoc(const MemRegion *R) const {
197   // We only want to do fetches from regions that we can actually bind
198   // values.  For example, SymbolicRegions of type 'id<...>' cannot
199   // have direct bindings (but their can be bindings on their subregions).
200   if (!R->isBoundable())
201     return UnknownVal();
202 
203   if (const TypedRegion *TR = dyn_cast<TypedRegion>(R)) {
204     QualType T = TR->getValueType();
205     if (Loc::isLocType(T) || T->isIntegerType())
206       return getSVal(R);
207   }
208 
209   return UnknownVal();
210 }
211 
getSVal(Loc location,QualType T) const212 SVal GRState::getSVal(Loc location, QualType T) const {
213   SVal V = getRawSVal(cast<Loc>(location), T);
214 
215   // If 'V' is a symbolic value that is *perfectly* constrained to
216   // be a constant value, use that value instead to lessen the burden
217   // on later analysis stages (so we have less symbolic values to reason
218   // about).
219   if (!T.isNull()) {
220     if (SymbolRef sym = V.getAsSymbol()) {
221       if (const llvm::APSInt *Int = getSymVal(sym)) {
222         // FIXME: Because we don't correctly model (yet) sign-extension
223         // and truncation of symbolic values, we need to convert
224         // the integer value to the correct signedness and bitwidth.
225         //
226         // This shows up in the following:
227         //
228         //   char foo();
229         //   unsigned x = foo();
230         //   if (x == 54)
231         //     ...
232         //
233         //  The symbolic value stored to 'x' is actually the conjured
234         //  symbol for the call to foo(); the type of that symbol is 'char',
235         //  not unsigned.
236         const llvm::APSInt &NewV = getBasicVals().Convert(T, *Int);
237 
238         if (isa<Loc>(V))
239           return loc::ConcreteInt(NewV);
240         else
241           return nonloc::ConcreteInt(NewV);
242       }
243     }
244   }
245 
246   return V;
247 }
248 
BindExpr(const Stmt * S,SVal V,bool Invalidate) const249 const GRState *GRState::BindExpr(const Stmt* S, SVal V, bool Invalidate) const{
250   Environment NewEnv = getStateManager().EnvMgr.bindExpr(Env, S, V,
251                                                          Invalidate);
252   if (NewEnv == Env)
253     return this;
254 
255   GRState NewSt = *this;
256   NewSt.Env = NewEnv;
257   return getStateManager().getPersistentState(NewSt);
258 }
259 
bindExprAndLocation(const Stmt * S,SVal location,SVal V) const260 const GRState *GRState::bindExprAndLocation(const Stmt *S, SVal location,
261                                             SVal V) const {
262   Environment NewEnv =
263     getStateManager().EnvMgr.bindExprAndLocation(Env, S, location, V);
264 
265   if (NewEnv == Env)
266     return this;
267 
268   GRState NewSt = *this;
269   NewSt.Env = NewEnv;
270   return getStateManager().getPersistentState(NewSt);
271 }
272 
assumeInBound(DefinedOrUnknownSVal Idx,DefinedOrUnknownSVal UpperBound,bool Assumption) const273 const GRState *GRState::assumeInBound(DefinedOrUnknownSVal Idx,
274                                       DefinedOrUnknownSVal UpperBound,
275                                       bool Assumption) const {
276   if (Idx.isUnknown() || UpperBound.isUnknown())
277     return this;
278 
279   // Build an expression for 0 <= Idx < UpperBound.
280   // This is the same as Idx + MIN < UpperBound + MIN, if overflow is allowed.
281   // FIXME: This should probably be part of SValBuilder.
282   GRStateManager &SM = getStateManager();
283   SValBuilder &svalBuilder = SM.getSValBuilder();
284   ASTContext &Ctx = svalBuilder.getContext();
285 
286   // Get the offset: the minimum value of the array index type.
287   BasicValueFactory &BVF = svalBuilder.getBasicValueFactory();
288   // FIXME: This should be using ValueManager::ArrayindexTy...somehow.
289   QualType indexTy = Ctx.IntTy;
290   nonloc::ConcreteInt Min(BVF.getMinValue(indexTy));
291 
292   // Adjust the index.
293   SVal newIdx = svalBuilder.evalBinOpNN(this, BO_Add,
294                                         cast<NonLoc>(Idx), Min, indexTy);
295   if (newIdx.isUnknownOrUndef())
296     return this;
297 
298   // Adjust the upper bound.
299   SVal newBound =
300     svalBuilder.evalBinOpNN(this, BO_Add, cast<NonLoc>(UpperBound),
301                             Min, indexTy);
302 
303   if (newBound.isUnknownOrUndef())
304     return this;
305 
306   // Build the actual comparison.
307   SVal inBound = svalBuilder.evalBinOpNN(this, BO_LT,
308                                 cast<NonLoc>(newIdx), cast<NonLoc>(newBound),
309                                 Ctx.IntTy);
310   if (inBound.isUnknownOrUndef())
311     return this;
312 
313   // Finally, let the constraint manager take care of it.
314   ConstraintManager &CM = SM.getConstraintManager();
315   return CM.assume(this, cast<DefinedSVal>(inBound), Assumption);
316 }
317 
getInitialState(const LocationContext * InitLoc)318 const GRState* GRStateManager::getInitialState(const LocationContext *InitLoc) {
319   GRState State(this,
320                 EnvMgr.getInitialEnvironment(),
321                 StoreMgr->getInitialStore(InitLoc),
322                 GDMFactory.getEmptyMap());
323 
324   return getPersistentState(State);
325 }
326 
recycleUnusedStates()327 void GRStateManager::recycleUnusedStates() {
328   for (std::vector<GRState*>::iterator i = recentlyAllocatedStates.begin(),
329        e = recentlyAllocatedStates.end(); i != e; ++i) {
330     GRState *state = *i;
331     if (state->referencedByExplodedNode())
332       continue;
333     StateSet.RemoveNode(state);
334     freeStates.push_back(state);
335     state->~GRState();
336   }
337   recentlyAllocatedStates.clear();
338 }
339 
getPersistentState(GRState & State)340 const GRState* GRStateManager::getPersistentState(GRState& State) {
341 
342   llvm::FoldingSetNodeID ID;
343   State.Profile(ID);
344   void* InsertPos;
345 
346   if (GRState* I = StateSet.FindNodeOrInsertPos(ID, InsertPos))
347     return I;
348 
349   GRState *newState = 0;
350   if (!freeStates.empty()) {
351     newState = freeStates.back();
352     freeStates.pop_back();
353   }
354   else {
355     newState = (GRState*) Alloc.Allocate<GRState>();
356   }
357   new (newState) GRState(State);
358   StateSet.InsertNode(newState, InsertPos);
359   recentlyAllocatedStates.push_back(newState);
360   return newState;
361 }
362 
makeWithStore(const StoreRef & store) const363 const GRState* GRState::makeWithStore(const StoreRef &store) const {
364   GRState NewSt = *this;
365   NewSt.setStore(store);
366   return getStateManager().getPersistentState(NewSt);
367 }
368 
setStore(const StoreRef & newStore)369 void GRState::setStore(const StoreRef &newStore) {
370   Store newStoreStore = newStore.getStore();
371   if (newStoreStore)
372     stateMgr->getStoreManager().incrementReferenceCount(newStoreStore);
373   if (store)
374     stateMgr->getStoreManager().decrementReferenceCount(store);
375   store = newStoreStore;
376 }
377 
378 //===----------------------------------------------------------------------===//
379 //  State pretty-printing.
380 //===----------------------------------------------------------------------===//
381 
IsEnvLoc(const Stmt * S)382 static bool IsEnvLoc(const Stmt *S) {
383   // FIXME: This is a layering violation.  Should be in environment.
384   return (bool) (((uintptr_t) S) & 0x1);
385 }
386 
print(llvm::raw_ostream & Out,CFG & C,const char * nl,const char * sep) const387 void GRState::print(llvm::raw_ostream& Out, CFG &C, const char* nl,
388                     const char* sep) const {
389   // Print the store.
390   GRStateManager &Mgr = getStateManager();
391   Mgr.getStoreManager().print(getStore(), Out, nl, sep);
392 
393   // Print Subexpression bindings.
394   bool isFirst = true;
395 
396   // FIXME: All environment printing should be moved inside Environment.
397   for (Environment::iterator I = Env.begin(), E = Env.end(); I != E; ++I) {
398     if (C.isBlkExpr(I.getKey()) || IsEnvLoc(I.getKey()))
399       continue;
400 
401     if (isFirst) {
402       Out << nl << nl << "Sub-Expressions:" << nl;
403       isFirst = false;
404     }
405     else { Out << nl; }
406 
407     Out << " (" << (void*) I.getKey() << ") ";
408     LangOptions LO; // FIXME.
409     I.getKey()->printPretty(Out, 0, PrintingPolicy(LO));
410     Out << " : " << I.getData();
411   }
412 
413   // Print block-expression bindings.
414   isFirst = true;
415 
416   for (Environment::iterator I = Env.begin(), E = Env.end(); I != E; ++I) {
417     if (!C.isBlkExpr(I.getKey()))
418       continue;
419 
420     if (isFirst) {
421       Out << nl << nl << "Block-level Expressions:" << nl;
422       isFirst = false;
423     }
424     else { Out << nl; }
425 
426     Out << " (" << (void*) I.getKey() << ") ";
427     LangOptions LO; // FIXME.
428     I.getKey()->printPretty(Out, 0, PrintingPolicy(LO));
429     Out << " : " << I.getData();
430   }
431 
432   // Print locations.
433   isFirst = true;
434 
435   for (Environment::iterator I = Env.begin(), E = Env.end(); I != E; ++I) {
436     if (!IsEnvLoc(I.getKey()))
437       continue;
438 
439     if (isFirst) {
440       Out << nl << nl << "Load/store locations:" << nl;
441       isFirst = false;
442     }
443     else { Out << nl; }
444 
445     const Stmt *S = (Stmt*) (((uintptr_t) I.getKey()) & ((uintptr_t) ~0x1));
446 
447     Out << " (" << (void*) S << ") ";
448     LangOptions LO; // FIXME.
449     S->printPretty(Out, 0, PrintingPolicy(LO));
450     Out << " : " << I.getData();
451   }
452 
453   Mgr.getConstraintManager().print(this, Out, nl, sep);
454 
455   // Print checker-specific data.
456   for (std::vector<Printer*>::iterator I = Mgr.Printers.begin(),
457                                        E = Mgr.Printers.end(); I != E; ++I) {
458     (*I)->Print(Out, this, nl, sep);
459   }
460 }
461 
printDOT(llvm::raw_ostream & Out,CFG & C) const462 void GRState::printDOT(llvm::raw_ostream& Out, CFG &C) const {
463   print(Out, C, "\\l", "\\|");
464 }
465 
printStdErr(CFG & C) const466 void GRState::printStdErr(CFG &C) const {
467   print(llvm::errs(), C);
468 }
469 
470 //===----------------------------------------------------------------------===//
471 // Generic Data Map.
472 //===----------------------------------------------------------------------===//
473 
FindGDM(void * K) const474 void* const* GRState::FindGDM(void* K) const {
475   return GDM.lookup(K);
476 }
477 
478 void*
FindGDMContext(void * K,void * (* CreateContext)(llvm::BumpPtrAllocator &),void (* DeleteContext)(void *))479 GRStateManager::FindGDMContext(void* K,
480                                void* (*CreateContext)(llvm::BumpPtrAllocator&),
481                                void (*DeleteContext)(void*)) {
482 
483   std::pair<void*, void (*)(void*)>& p = GDMContexts[K];
484   if (!p.first) {
485     p.first = CreateContext(Alloc);
486     p.second = DeleteContext;
487   }
488 
489   return p.first;
490 }
491 
addGDM(const GRState * St,void * Key,void * Data)492 const GRState* GRStateManager::addGDM(const GRState* St, void* Key, void* Data){
493   GRState::GenericDataMap M1 = St->getGDM();
494   GRState::GenericDataMap M2 = GDMFactory.add(M1, Key, Data);
495 
496   if (M1 == M2)
497     return St;
498 
499   GRState NewSt = *St;
500   NewSt.GDM = M2;
501   return getPersistentState(NewSt);
502 }
503 
removeGDM(const GRState * state,void * Key)504 const GRState *GRStateManager::removeGDM(const GRState *state, void *Key) {
505   GRState::GenericDataMap OldM = state->getGDM();
506   GRState::GenericDataMap NewM = GDMFactory.remove(OldM, Key);
507 
508   if (NewM == OldM)
509     return state;
510 
511   GRState NewState = *state;
512   NewState.GDM = NewM;
513   return getPersistentState(NewState);
514 }
515 
516 //===----------------------------------------------------------------------===//
517 // Utility.
518 //===----------------------------------------------------------------------===//
519 
520 namespace {
521 class ScanReachableSymbols : public SubRegionMap::Visitor  {
522   typedef llvm::DenseSet<const MemRegion*> VisitedRegionsTy;
523 
524   VisitedRegionsTy visited;
525   const GRState *state;
526   SymbolVisitor &visitor;
527   llvm::OwningPtr<SubRegionMap> SRM;
528 public:
529 
ScanReachableSymbols(const GRState * st,SymbolVisitor & v)530   ScanReachableSymbols(const GRState *st, SymbolVisitor& v)
531     : state(st), visitor(v) {}
532 
533   bool scan(nonloc::CompoundVal val);
534   bool scan(SVal val);
535   bool scan(const MemRegion *R);
536 
537   // From SubRegionMap::Visitor.
Visit(const MemRegion * Parent,const MemRegion * SubRegion)538   bool Visit(const MemRegion* Parent, const MemRegion* SubRegion) {
539     return scan(SubRegion);
540   }
541 };
542 }
543 
scan(nonloc::CompoundVal val)544 bool ScanReachableSymbols::scan(nonloc::CompoundVal val) {
545   for (nonloc::CompoundVal::iterator I=val.begin(), E=val.end(); I!=E; ++I)
546     if (!scan(*I))
547       return false;
548 
549   return true;
550 }
551 
scan(SVal val)552 bool ScanReachableSymbols::scan(SVal val) {
553   if (loc::MemRegionVal *X = dyn_cast<loc::MemRegionVal>(&val))
554     return scan(X->getRegion());
555 
556   if (nonloc::LocAsInteger *X = dyn_cast<nonloc::LocAsInteger>(&val))
557     return scan(X->getLoc());
558 
559   if (SymbolRef Sym = val.getAsSymbol())
560     return visitor.VisitSymbol(Sym);
561 
562   if (nonloc::CompoundVal *X = dyn_cast<nonloc::CompoundVal>(&val))
563     return scan(*X);
564 
565   return true;
566 }
567 
scan(const MemRegion * R)568 bool ScanReachableSymbols::scan(const MemRegion *R) {
569   if (isa<MemSpaceRegion>(R) || visited.count(R))
570     return true;
571 
572   visited.insert(R);
573 
574   // If this is a symbolic region, visit the symbol for the region.
575   if (const SymbolicRegion *SR = dyn_cast<SymbolicRegion>(R))
576     if (!visitor.VisitSymbol(SR->getSymbol()))
577       return false;
578 
579   // If this is a subregion, also visit the parent regions.
580   if (const SubRegion *SR = dyn_cast<SubRegion>(R))
581     if (!scan(SR->getSuperRegion()))
582       return false;
583 
584   // Now look at the binding to this region (if any).
585   if (!scan(state->getSValAsScalarOrLoc(R)))
586     return false;
587 
588   // Now look at the subregions.
589   if (!SRM.get())
590     SRM.reset(state->getStateManager().getStoreManager().
591                                            getSubRegionMap(state->getStore()));
592 
593   return SRM->iterSubRegions(R, *this);
594 }
595 
scanReachableSymbols(SVal val,SymbolVisitor & visitor) const596 bool GRState::scanReachableSymbols(SVal val, SymbolVisitor& visitor) const {
597   ScanReachableSymbols S(this, visitor);
598   return S.scan(val);
599 }
600 
scanReachableSymbols(const SVal * I,const SVal * E,SymbolVisitor & visitor) const601 bool GRState::scanReachableSymbols(const SVal *I, const SVal *E,
602                                    SymbolVisitor &visitor) const {
603   ScanReachableSymbols S(this, visitor);
604   for ( ; I != E; ++I) {
605     if (!S.scan(*I))
606       return false;
607   }
608   return true;
609 }
610 
scanReachableSymbols(const MemRegion * const * I,const MemRegion * const * E,SymbolVisitor & visitor) const611 bool GRState::scanReachableSymbols(const MemRegion * const *I,
612                                    const MemRegion * const *E,
613                                    SymbolVisitor &visitor) const {
614   ScanReachableSymbols S(this, visitor);
615   for ( ; I != E; ++I) {
616     if (!S.scan(*I))
617       return false;
618   }
619   return true;
620 }
621