| //== Store.h - Interface for maps from Locations to Values ------*- C++ -*--==// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file defined the types Store and StoreManager. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_CLANG_GR_STORE_H |
| #define LLVM_CLANG_GR_STORE_H |
| |
| #include "clang/EntoSA/PathSensitive/MemRegion.h" |
| #include "clang/EntoSA/PathSensitive/SValBuilder.h" |
| #include "llvm/ADT/DenseSet.h" |
| #include "llvm/ADT/Optional.h" |
| |
| namespace clang { |
| |
| class Stmt; |
| class Expr; |
| class ObjCIvarDecl; |
| class StackFrameContext; |
| |
| namespace ento { |
| |
| /// Store - This opaque type encapsulates an immutable mapping from |
| /// locations to values. At a high-level, it represents the symbolic |
| /// memory model. Different subclasses of StoreManager may choose |
| /// different types to represent the locations and values. |
| typedef const void* Store; |
| |
| class GRState; |
| class GRStateManager; |
| class SubRegionMap; |
| |
| class StoreManager { |
| protected: |
| SValBuilder &svalBuilder; |
| GRStateManager &StateMgr; |
| |
| /// MRMgr - Manages region objects associated with this StoreManager. |
| MemRegionManager &MRMgr; |
| ASTContext &Ctx; |
| |
| StoreManager(GRStateManager &stateMgr); |
| |
| public: |
| virtual ~StoreManager() {} |
| |
| /// Return the value bound to specified location in a given state. |
| /// \param[in] state The analysis state. |
| /// \param[in] loc The symbolic memory location. |
| /// \param[in] T An optional type that provides a hint indicating the |
| /// expected type of the returned value. This is used if the value is |
| /// lazily computed. |
| /// \return The value bound to the location \c loc. |
| virtual SVal Retrieve(Store store, Loc loc, QualType T = QualType()) = 0; |
| |
| /// Return a state with the specified value bound to the given location. |
| /// \param[in] state The analysis state. |
| /// \param[in] loc The symbolic memory location. |
| /// \param[in] val The value to bind to location \c loc. |
| /// \return A pointer to a GRState object that contains the same bindings as |
| /// \c state with the addition of having the value specified by \c val bound |
| /// to the location given for \c loc. |
| virtual Store Bind(Store store, Loc loc, SVal val) = 0; |
| |
| virtual Store BindDefault(Store store, const MemRegion *R, SVal V) { |
| return store; |
| } |
| |
| virtual Store Remove(Store St, Loc L) = 0; |
| |
| /// BindCompoundLiteral - Return the store that has the bindings currently |
| /// in 'store' plus the bindings for the CompoundLiteral. 'R' is the region |
| /// for the compound literal and 'BegInit' and 'EndInit' represent an |
| /// array of initializer values. |
| virtual Store BindCompoundLiteral(Store store, |
| const CompoundLiteralExpr* cl, |
| const LocationContext *LC, SVal v) = 0; |
| |
| /// getInitialStore - Returns the initial "empty" store representing the |
| /// value bindings upon entry to an analyzed function. |
| virtual Store getInitialStore(const LocationContext *InitLoc) = 0; |
| |
| /// getRegionManager - Returns the internal RegionManager object that is |
| /// used to query and manipulate MemRegion objects. |
| MemRegionManager& getRegionManager() { return MRMgr; } |
| |
| /// getSubRegionMap - Returns an opaque map object that clients can query |
| /// to get the subregions of a given MemRegion object. It is the |
| // caller's responsibility to 'delete' the returned map. |
| virtual SubRegionMap *getSubRegionMap(Store store) = 0; |
| |
| virtual Loc getLValueVar(const VarDecl *VD, const LocationContext *LC) { |
| return svalBuilder.makeLoc(MRMgr.getVarRegion(VD, LC)); |
| } |
| |
| virtual Loc getLValueString(const StringLiteral* S) { |
| return svalBuilder.makeLoc(MRMgr.getStringRegion(S)); |
| } |
| |
| Loc getLValueCompoundLiteral(const CompoundLiteralExpr* CL, |
| const LocationContext *LC) { |
| return loc::MemRegionVal(MRMgr.getCompoundLiteralRegion(CL, LC)); |
| } |
| |
| virtual SVal getLValueIvar(const ObjCIvarDecl* decl, SVal base) { |
| return getLValueFieldOrIvar(decl, base); |
| } |
| |
| virtual SVal getLValueField(const FieldDecl* D, SVal Base) { |
| return getLValueFieldOrIvar(D, Base); |
| } |
| |
| virtual SVal getLValueElement(QualType elementType, NonLoc offset, SVal Base); |
| |
| // FIXME: This should soon be eliminated altogether; clients should deal with |
| // region extents directly. |
| virtual DefinedOrUnknownSVal getSizeInElements(const GRState *state, |
| const MemRegion *region, |
| QualType EleTy) { |
| return UnknownVal(); |
| } |
| |
| /// ArrayToPointer - Used by ExprEngine::VistCast to handle implicit |
| /// conversions between arrays and pointers. |
| virtual SVal ArrayToPointer(Loc Array) = 0; |
| |
| /// Evaluates DerivedToBase casts. |
| virtual SVal evalDerivedToBase(SVal derived, QualType basePtrType) { |
| return UnknownVal(); |
| } |
| |
| class CastResult { |
| const GRState *state; |
| const MemRegion *region; |
| public: |
| const GRState *getState() const { return state; } |
| const MemRegion* getRegion() const { return region; } |
| CastResult(const GRState *s, const MemRegion* r = 0) : state(s), region(r){} |
| }; |
| |
| const ElementRegion *GetElementZeroRegion(const MemRegion *R, QualType T); |
| |
| /// CastRegion - Used by ExprEngine::VisitCast to handle casts from |
| /// a MemRegion* to a specific location type. 'R' is the region being |
| /// casted and 'CastToTy' the result type of the cast. |
| const MemRegion *CastRegion(const MemRegion *region, QualType CastToTy); |
| |
| |
| /// evalBinOp - Perform pointer arithmetic. |
| virtual SVal evalBinOp(BinaryOperator::Opcode Op, |
| Loc lhs, NonLoc rhs, QualType resultTy) { |
| return UnknownVal(); |
| } |
| |
| virtual Store RemoveDeadBindings(Store store, const StackFrameContext *LCtx, |
| SymbolReaper& SymReaper, |
| llvm::SmallVectorImpl<const MemRegion*>& RegionRoots) = 0; |
| |
| virtual Store BindDecl(Store store, const VarRegion *VR, SVal initVal) = 0; |
| |
| virtual Store BindDeclWithNoInit(Store store, const VarRegion *VR) = 0; |
| |
| typedef llvm::DenseSet<SymbolRef> InvalidatedSymbols; |
| typedef llvm::SmallVector<const MemRegion *, 8> InvalidatedRegions; |
| |
| /// InvalidateRegions - Clears out the specified regions from the store, |
| /// marking their values as unknown. Depending on the store, this may also |
| /// invalidate additional regions that may have changed based on accessing |
| /// the given regions. Optionally, invalidates non-static globals as well. |
| /// \param[in] store The initial store |
| /// \param[in] Begin A pointer to the first region to invalidate. |
| /// \param[in] End A pointer just past the last region to invalidate. |
| /// \param[in] E The current statement being evaluated. Used to conjure |
| /// symbols to mark the values of invalidated regions. |
| /// \param[in] Count The current block count. Used to conjure |
| /// symbols to mark the values of invalidated regions. |
| /// \param[in,out] IS A set to fill with any symbols that are no longer |
| /// accessible. Pass \c NULL if this information will not be used. |
| /// \param[in] invalidateGlobals If \c true, any non-static global regions |
| /// are invalidated as well. |
| /// \param[in,out] Regions A vector to fill with any regions being |
| /// invalidated. This should include any regions explicitly invalidated |
| /// even if they do not currently have bindings. Pass \c NULL if this |
| /// information will not be used. |
| virtual Store InvalidateRegions(Store store, |
| const MemRegion * const *Begin, |
| const MemRegion * const *End, |
| const Expr *E, unsigned Count, |
| InvalidatedSymbols *IS, |
| bool invalidateGlobals, |
| InvalidatedRegions *Regions) = 0; |
| |
| /// EnterStackFrame - Let the StoreManager to do something when execution |
| /// engine is about to execute into a callee. |
| virtual Store EnterStackFrame(const GRState *state, |
| const StackFrameContext *frame); |
| |
| virtual void print(Store store, llvm::raw_ostream& Out, |
| const char* nl, const char *sep) = 0; |
| |
| class BindingsHandler { |
| public: |
| virtual ~BindingsHandler(); |
| virtual bool HandleBinding(StoreManager& SMgr, Store store, |
| const MemRegion *region, SVal val) = 0; |
| }; |
| |
| /// iterBindings - Iterate over the bindings in the Store. |
| virtual void iterBindings(Store store, BindingsHandler& f) = 0; |
| |
| protected: |
| const MemRegion *MakeElementRegion(const MemRegion *baseRegion, |
| QualType pointeeTy, uint64_t index = 0); |
| |
| /// CastRetrievedVal - Used by subclasses of StoreManager to implement |
| /// implicit casts that arise from loads from regions that are reinterpreted |
| /// as another region. |
| SVal CastRetrievedVal(SVal val, const TypedRegion *region, QualType castTy, |
| bool performTestOnly = true); |
| |
| private: |
| SVal getLValueFieldOrIvar(const Decl* decl, SVal base); |
| }; |
| |
| // FIXME: Do we still need this? |
| /// SubRegionMap - An abstract interface that represents a queryable map |
| /// between MemRegion objects and their subregions. |
| class SubRegionMap { |
| public: |
| virtual ~SubRegionMap() {} |
| |
| class Visitor { |
| public: |
| virtual ~Visitor() {} |
| virtual bool Visit(const MemRegion* Parent, const MemRegion* SubRegion) = 0; |
| }; |
| |
| virtual bool iterSubRegions(const MemRegion *region, Visitor& V) const = 0; |
| }; |
| |
| // FIXME: Do we need to pass GRStateManager anymore? |
| StoreManager *CreateBasicStoreManager(GRStateManager& StMgr); |
| StoreManager *CreateRegionStoreManager(GRStateManager& StMgr); |
| StoreManager *CreateFieldsOnlyRegionStoreManager(GRStateManager& StMgr); |
| StoreManager *CreateFlatStoreManager(GRStateManager &StMgr); |
| |
| } // end GR namespace |
| |
| } // end clang namespace |
| |
| #endif |