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//== 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/StaticAnalyzer/Core/PathSensitive/StoreRef.h"
#include "clang/StaticAnalyzer/Core/PathSensitive/MemRegion.h"
#include "clang/StaticAnalyzer/Core/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 {
class CallOrObjCMessage;
class ProgramState;
class ProgramStateManager;
class SubRegionMap;
class StoreManager {
protected:
SValBuilder &svalBuilder;
ProgramStateManager &StateMgr;
/// MRMgr - Manages region objects associated with this StoreManager.
MemRegionManager &MRMgr;
ASTContext &Ctx;
StoreManager(ProgramStateManager &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 ProgramState 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 StoreRef Bind(Store store, Loc loc, SVal val) = 0;
virtual StoreRef BindDefault(Store store, const MemRegion *R, SVal V);
virtual StoreRef 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 StoreRef 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 StoreRef 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 ProgramState *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 ProgramState *state;
const MemRegion *region;
public:
const ProgramState *getState() const { return state; }
const MemRegion* getRegion() const { return region; }
CastResult(const ProgramState *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);
virtual StoreRef removeDeadBindings(Store store, const StackFrameContext *LCtx,
SymbolReaper& SymReaper) = 0;
virtual StoreRef BindDecl(Store store, const VarRegion *VR, SVal initVal) = 0;
virtual StoreRef BindDeclWithNoInit(Store store, const VarRegion *VR) = 0;
virtual bool includedInBindings(Store store,
const MemRegion *region) const = 0;
/// If the StoreManager supports it, increment the reference count of
/// the specified Store object.
virtual void incrementReferenceCount(Store store) {}
/// If the StoreManager supports it, decrement the reference count of
/// the specified Store object. If the reference count hits 0, the memory
/// associated with the object is recycled.
virtual void decrementReferenceCount(Store store) {}
typedef llvm::DenseSet<SymbolRef> InvalidatedSymbols;
typedef 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] Call The call expression which will be used to determine which
/// globals should get invalidated.
/// \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 StoreRef invalidateRegions(Store store,
ArrayRef<const MemRegion *> Regions,
const Expr *E, unsigned Count,
InvalidatedSymbols &IS,
const CallOrObjCMessage *Call,
InvalidatedRegions *Invalidated) = 0;
/// enterStackFrame - Let the StoreManager to do something when execution
/// engine is about to execute into a callee.
virtual StoreRef enterStackFrame(const ProgramState *state,
const StackFrameContext *frame);
virtual void print(Store store, 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 TypedValueRegion *region,
QualType castTy, bool performTestOnly = true);
private:
SVal getLValueFieldOrIvar(const Decl *decl, SVal base);
};
inline StoreRef::StoreRef(Store store, StoreManager & smgr)
: store(store), mgr(smgr) {
if (store)
mgr.incrementReferenceCount(store);
}
inline StoreRef::StoreRef(const StoreRef &sr)
: store(sr.store), mgr(sr.mgr)
{
if (store)
mgr.incrementReferenceCount(store);
}
inline StoreRef::~StoreRef() {
if (store)
mgr.decrementReferenceCount(store);
}
inline StoreRef &StoreRef::operator=(StoreRef const &newStore) {
assert(&newStore.mgr == &mgr);
if (store != newStore.store) {
mgr.incrementReferenceCount(newStore.store);
mgr.decrementReferenceCount(store);
store = newStore.getStore();
}
return *this;
}
// FIXME: Do we still need this?
/// SubRegionMap - An abstract interface that represents a queryable map
/// between MemRegion objects and their subregions.
class SubRegionMap {
virtual void anchor();
public:
virtual ~SubRegionMap() {}
class Visitor {
virtual void anchor();
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 ProgramStateManager anymore?
StoreManager *CreateRegionStoreManager(ProgramStateManager& StMgr);
StoreManager *CreateFieldsOnlyRegionStoreManager(ProgramStateManager& StMgr);
} // end GR namespace
} // end clang namespace
#endif