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llvm-project/clang/lib/Analysis/RegionStore.cpp

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//== RegionStore.cpp - Field-sensitive store model --------------*- C++ -*--==//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines a basic region store model. In this model, we do have field
// sensitivity. But we assume nothing about the heap shape. So recursive data
// structures are largely ignored. Basically we do 1-limiting analysis.
// Parameter pointers are assumed with no aliasing. Pointee objects of
// parameters are created lazily.
//
//===----------------------------------------------------------------------===//
#include "clang/Analysis/PathSensitive/MemRegion.h"
#include "clang/Analysis/PathSensitive/GRState.h"
#include "clang/Analysis/PathSensitive/GRStateTrait.h"
#include "clang/Analysis/Analyses/LiveVariables.h"
#include "clang/Basic/TargetInfo.h"
#include "llvm/ADT/ImmutableMap.h"
#include "llvm/ADT/ImmutableList.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/Compiler.h"
using namespace clang;
// Actual Store type.
typedef llvm::ImmutableMap<const MemRegion*, SVal> RegionBindingsTy;
//===----------------------------------------------------------------------===//
// Fine-grained control of RegionStoreManager.
//===----------------------------------------------------------------------===//
namespace {
struct VISIBILITY_HIDDEN minimal_features_tag {};
struct VISIBILITY_HIDDEN maximal_features_tag {};
class VISIBILITY_HIDDEN RegionStoreFeatures {
bool SupportsFields;
bool SupportsRemaining;
public:
RegionStoreFeatures(minimal_features_tag) :
SupportsFields(false), SupportsRemaining(false) {}
RegionStoreFeatures(maximal_features_tag) :
SupportsFields(true), SupportsRemaining(false) {}
void enableFields(bool t) { SupportsFields = t; }
bool supportsFields() const { return SupportsFields; }
bool supportsRemaining() const { return SupportsRemaining; }
};
}
//===----------------------------------------------------------------------===//
// Region "Views"
//===----------------------------------------------------------------------===//
//
// MemRegions can be layered on top of each other. This GDM entry tracks
// what are the MemRegions that layer a given MemRegion.
//
typedef llvm::ImmutableSet<const MemRegion*> RegionViews;
namespace { class VISIBILITY_HIDDEN RegionViewMap {}; }
static int RegionViewMapIndex = 0;
namespace clang {
template<> struct GRStateTrait<RegionViewMap>
: public GRStatePartialTrait<llvm::ImmutableMap<const MemRegion*,
RegionViews> > {
static void* GDMIndex() { return &RegionViewMapIndex; }
};
}
// RegionCasts records the current cast type of a region.
namespace { class VISIBILITY_HIDDEN RegionCasts {}; }
static int RegionCastsIndex = 0;
namespace clang {
template<> struct GRStateTrait<RegionCasts>
: public GRStatePartialTrait<llvm::ImmutableMap<const MemRegion*,
QualType> > {
static void* GDMIndex() { return &RegionCastsIndex; }
};
}
//===----------------------------------------------------------------------===//
// Region "Extents"
//===----------------------------------------------------------------------===//
//
// MemRegions represent chunks of memory with a size (their "extent"). This
// GDM entry tracks the extents for regions. Extents are in bytes.
//
namespace { class VISIBILITY_HIDDEN RegionExtents {}; }
static int RegionExtentsIndex = 0;
namespace clang {
template<> struct GRStateTrait<RegionExtents>
: public GRStatePartialTrait<llvm::ImmutableMap<const MemRegion*, SVal> > {
static void* GDMIndex() { return &RegionExtentsIndex; }
};
}
//===----------------------------------------------------------------------===//
// Regions with default values.
//===----------------------------------------------------------------------===//
//
// This GDM entry tracks what regions have a default value if they have no bound
// value and have not been killed.
//
namespace { class VISIBILITY_HIDDEN RegionDefaultValue {}; }
static int RegionDefaultValueIndex = 0;
namespace clang {
template<> struct GRStateTrait<RegionDefaultValue>
: public GRStatePartialTrait<llvm::ImmutableMap<const MemRegion*, SVal> > {
static void* GDMIndex() { return &RegionDefaultValueIndex; }
};
}
//===----------------------------------------------------------------------===//
// Main RegionStore logic.
//===----------------------------------------------------------------------===//
namespace {
class VISIBILITY_HIDDEN RegionStoreSubRegionMap : public SubRegionMap {
typedef llvm::DenseMap<const MemRegion*,
llvm::ImmutableSet<const MemRegion*> > Map;
llvm::ImmutableSet<const MemRegion*>::Factory F;
Map M;
public:
void add(const MemRegion* Parent, const MemRegion* SubRegion) {
Map::iterator I = M.find(Parent);
M.insert(std::make_pair(Parent,
F.Add(I == M.end() ? F.GetEmptySet() : I->second, SubRegion)));
}
~RegionStoreSubRegionMap() {}
bool iterSubRegions(const MemRegion* Parent, Visitor& V) const {
Map::iterator I = M.find(Parent);
if (I == M.end())
return true;
llvm::ImmutableSet<const MemRegion*> S = I->second;
for (llvm::ImmutableSet<const MemRegion*>::iterator SI=S.begin(),SE=S.end();
SI != SE; ++SI) {
if (!V.Visit(Parent, *SI))
return false;
}
return true;
}
};
class VISIBILITY_HIDDEN RegionStoreManager : public StoreManager {
const RegionStoreFeatures Features;
RegionBindingsTy::Factory RBFactory;
RegionViews::Factory RVFactory;
const MemRegion* SelfRegion;
const ImplicitParamDecl *SelfDecl;
public:
RegionStoreManager(GRStateManager& mgr, const RegionStoreFeatures &f)
: StoreManager(mgr),
Features(f),
RBFactory(mgr.getAllocator()),
RVFactory(mgr.getAllocator()),
SelfRegion(0), SelfDecl(0) {
if (const ObjCMethodDecl* MD =
dyn_cast<ObjCMethodDecl>(&StateMgr.getCodeDecl()))
SelfDecl = MD->getSelfDecl();
}
virtual ~RegionStoreManager() {}
SubRegionMap* getSubRegionMap(const GRState *state);
/// getLValueString - Returns an SVal representing the lvalue of a
/// StringLiteral. Within RegionStore a StringLiteral has an
/// associated StringRegion, and the lvalue of a StringLiteral is
/// the lvalue of that region.
SVal getLValueString(const GRState *state, const StringLiteral* S);
/// getLValueCompoundLiteral - Returns an SVal representing the
/// lvalue of a compound literal. Within RegionStore a compound
/// literal has an associated region, and the lvalue of the
/// compound literal is the lvalue of that region.
SVal getLValueCompoundLiteral(const GRState *state, const CompoundLiteralExpr*);
/// getLValueVar - Returns an SVal that represents the lvalue of a
/// variable. Within RegionStore a variable has an associated
/// VarRegion, and the lvalue of the variable is the lvalue of that region.
SVal getLValueVar(const GRState *state, const VarDecl* VD);
SVal getLValueIvar(const GRState *state, const ObjCIvarDecl* D, SVal Base);
SVal getLValueField(const GRState *state, SVal Base, const FieldDecl* D);
SVal getLValueFieldOrIvar(const GRState *state, SVal Base, const Decl* D);
SVal getLValueElement(const GRState *state, QualType elementType,
SVal Base, SVal Offset);
/// ArrayToPointer - Emulates the "decay" of an array to a pointer
/// type. 'Array' represents the lvalue of the array being decayed
/// to a pointer, and the returned SVal represents the decayed
/// version of that lvalue (i.e., a pointer to the first element of
/// the array). This is called by GRExprEngine when evaluating
/// casts from arrays to pointers.
SVal ArrayToPointer(Loc Array);
CastResult CastRegion(const GRState *state, const MemRegion* R,
QualType CastToTy);
SVal EvalBinOp(const GRState *state, BinaryOperator::Opcode Op,Loc L,
NonLoc R);
Store getInitialStore() { return RBFactory.GetEmptyMap().getRoot(); }
/// getSelfRegion - Returns the region for the 'self' (Objective-C) or
/// 'this' object (C++). When used when analyzing a normal function this
/// method returns NULL.
const MemRegion* getSelfRegion(Store) {
if (!SelfDecl)
return 0;
if (!SelfRegion) {
const ObjCMethodDecl *MD = cast<ObjCMethodDecl>(&StateMgr.getCodeDecl());
SelfRegion = MRMgr.getObjCObjectRegion(MD->getClassInterface(),
MRMgr.getHeapRegion());
}
return SelfRegion;
}
//===-------------------------------------------------------------------===//
// Binding values to regions.
//===-------------------------------------------------------------------===//
const GRState *Bind(const GRState *state, Loc LV, SVal V);
const GRState *BindCompoundLiteral(const GRState *state,
const CompoundLiteralExpr* CL, SVal V);
const GRState *BindDecl(const GRState *state, const VarDecl* VD, SVal InitVal);
const GRState *BindDeclWithNoInit(const GRState *state, const VarDecl* VD) {
return state;
}
/// BindStruct - Bind a compound value to a structure.
const GRState *BindStruct(const GRState *, const TypedRegion* R, SVal V);
const GRState *BindArray(const GRState *state, const TypedRegion* R, SVal V);
/// KillStruct - Set the entire struct to unknown.
const GRState *KillStruct(const GRState *state, const TypedRegion* R);
const GRState *setDefaultValue(const GRState *state, const MemRegion* R, SVal V);
Store Remove(Store store, Loc LV);
//===------------------------------------------------------------------===//
// Loading values from regions.
//===------------------------------------------------------------------===//
/// The high level logic for this method is this:
/// Retrieve (L)
/// if L has binding
/// return L's binding
/// else if L is in killset
/// return unknown
/// else
/// if L is on stack or heap
/// return undefined
/// else
/// return symbolic
SVal Retrieve(const GRState *state, Loc L, QualType T = QualType());
SVal RetrieveElement(const GRState* state, const ElementRegion* R);
SVal RetrieveField(const GRState* state, const FieldRegion* R);
/// Retrieve the values in a struct and return a CompoundVal, used when doing
/// struct copy:
/// struct s x, y;
/// x = y;
/// y's value is retrieved by this method.
SVal RetrieveStruct(const GRState *St, const TypedRegion* R);
SVal RetrieveArray(const GRState *St, const TypedRegion* R);
//===------------------------------------------------------------------===//
// State pruning.
//===------------------------------------------------------------------===//
/// RemoveDeadBindings - Scans the RegionStore of 'state' for dead values.
/// It returns a new Store with these values removed.
Store RemoveDeadBindings(const GRState *state, Stmt* Loc, SymbolReaper& SymReaper,
llvm::SmallVectorImpl<const MemRegion*>& RegionRoots);
//===------------------------------------------------------------------===//
// Region "extents".
//===------------------------------------------------------------------===//
const GRState *setExtent(const GRState *state, const MemRegion* R, SVal Extent);
SVal getSizeInElements(const GRState *state, const MemRegion* R);
//===------------------------------------------------------------------===//
// Region "views".
//===------------------------------------------------------------------===//
const GRState *AddRegionView(const GRState *state, const MemRegion* View,
const MemRegion* Base);
const GRState *RemoveRegionView(const GRState *state, const MemRegion* View,
const MemRegion* Base);
//===------------------------------------------------------------------===//
// Utility methods.
//===------------------------------------------------------------------===//
const GRState *setCastType(const GRState *state, const MemRegion* R, QualType T);
static inline RegionBindingsTy GetRegionBindings(Store store) {
return RegionBindingsTy(static_cast<const RegionBindingsTy::TreeTy*>(store));
}
void print(Store store, llvm::raw_ostream& Out, const char* nl,
const char *sep);
void iterBindings(Store store, BindingsHandler& f) {
// FIXME: Implement.
}
// FIXME: Remove.
BasicValueFactory& getBasicVals() {
return StateMgr.getBasicVals();
}
// FIXME: Remove.
ASTContext& getContext() { return StateMgr.getContext(); }
// FIXME: Use ValueManager?
SymbolManager& getSymbolManager() { return StateMgr.getSymbolManager(); }
};
} // end anonymous namespace
//===----------------------------------------------------------------------===//
// RegionStore creation.
//===----------------------------------------------------------------------===//
StoreManager *clang::CreateRegionStoreManager(GRStateManager& StMgr) {
RegionStoreFeatures F = maximal_features_tag();
return new RegionStoreManager(StMgr, F);
}
StoreManager *clang::CreateFieldsOnlyRegionStoreManager(GRStateManager &StMgr) {
RegionStoreFeatures F = minimal_features_tag();
F.enableFields(true);
return new RegionStoreManager(StMgr, F);
}
SubRegionMap* RegionStoreManager::getSubRegionMap(const GRState *state) {
RegionBindingsTy B = GetRegionBindings(state->getStore());
RegionStoreSubRegionMap *M = new RegionStoreSubRegionMap();
for (RegionBindingsTy::iterator I=B.begin(), E=B.end(); I!=E; ++I) {
if (const SubRegion* R = dyn_cast<SubRegion>(I.getKey()))
M->add(R->getSuperRegion(), R);
}
return M;
}
//===----------------------------------------------------------------------===//
// getLValueXXX methods.
//===----------------------------------------------------------------------===//
/// getLValueString - Returns an SVal representing the lvalue of a
/// StringLiteral. Within RegionStore a StringLiteral has an
/// associated StringRegion, and the lvalue of a StringLiteral is the
/// lvalue of that region.
SVal RegionStoreManager::getLValueString(const GRState *St,
const StringLiteral* S) {
return loc::MemRegionVal(MRMgr.getStringRegion(S));
}
/// getLValueVar - Returns an SVal that represents the lvalue of a
/// variable. Within RegionStore a variable has an associated
/// VarRegion, and the lvalue of the variable is the lvalue of that region.
SVal RegionStoreManager::getLValueVar(const GRState *St, const VarDecl* VD) {
return loc::MemRegionVal(MRMgr.getVarRegion(VD));
}
/// getLValueCompoundLiteral - Returns an SVal representing the lvalue
/// of a compound literal. Within RegionStore a compound literal
/// has an associated region, and the lvalue of the compound literal
/// is the lvalue of that region.
SVal
RegionStoreManager::getLValueCompoundLiteral(const GRState *St,
const CompoundLiteralExpr* CL) {
return loc::MemRegionVal(MRMgr.getCompoundLiteralRegion(CL));
}
SVal RegionStoreManager::getLValueIvar(const GRState *St, const ObjCIvarDecl* D,
SVal Base) {
return getLValueFieldOrIvar(St, Base, D);
}
SVal RegionStoreManager::getLValueField(const GRState *St, SVal Base,
const FieldDecl* D) {
return getLValueFieldOrIvar(St, Base, D);
}
SVal RegionStoreManager::getLValueFieldOrIvar(const GRState *St, SVal Base,
const Decl* D) {
if (Base.isUnknownOrUndef())
return Base;
Loc BaseL = cast<Loc>(Base);
const MemRegion* BaseR = 0;
switch (BaseL.getSubKind()) {
case loc::MemRegionKind:
BaseR = cast<loc::MemRegionVal>(BaseL).getRegion();
break;
case loc::GotoLabelKind:
// These are anormal cases. Flag an undefined value.
return UndefinedVal();
case loc::ConcreteIntKind:
// While these seem funny, this can happen through casts.
// FIXME: What we should return is the field offset. For example,
// add the field offset to the integer value. That way funny things
// like this work properly: &(((struct foo *) 0xa)->f)
return Base;
default:
assert(0 && "Unhandled Base.");
return Base;
}
// NOTE: We must have this check first because ObjCIvarDecl is a subclass
// of FieldDecl.
if (const ObjCIvarDecl *ID = dyn_cast<ObjCIvarDecl>(D))
return loc::MemRegionVal(MRMgr.getObjCIvarRegion(ID, BaseR));
return loc::MemRegionVal(MRMgr.getFieldRegion(cast<FieldDecl>(D), BaseR));
}
SVal RegionStoreManager::getLValueElement(const GRState *St,
QualType elementType,
SVal Base, SVal Offset) {
// If the base is an unknown or undefined value, just return it back.
// FIXME: For absolute pointer addresses, we just return that value back as
// well, although in reality we should return the offset added to that
// value.
if (Base.isUnknownOrUndef() || isa<loc::ConcreteInt>(Base))
return Base;
// Only handle integer offsets... for now.
if (!isa<nonloc::ConcreteInt>(Offset))
return UnknownVal();
const MemRegion* BaseRegion = cast<loc::MemRegionVal>(Base).getRegion();
// Pointer of any type can be cast and used as array base.
const ElementRegion *ElemR = dyn_cast<ElementRegion>(BaseRegion);
if (!ElemR) {
//
// If the base region is not an ElementRegion, create one.
// This can happen in the following example:
//
// char *p = __builtin_alloc(10);
// p[1] = 8;
//
// Observe that 'p' binds to an AllocaRegion.
//
// Offset might be unsigned. We have to convert it to signed ConcreteInt.
if (nonloc::ConcreteInt* CI = dyn_cast<nonloc::ConcreteInt>(&Offset)) {
const llvm::APSInt& OffI = CI->getValue();
if (OffI.isUnsigned()) {
llvm::APSInt Tmp = OffI;
Tmp.setIsSigned(true);
Offset = ValMgr.makeIntVal(Tmp);
}
}
return loc::MemRegionVal(MRMgr.getElementRegion(elementType, Offset,
BaseRegion, getContext()));
}
SVal BaseIdx = ElemR->getIndex();
if (!isa<nonloc::ConcreteInt>(BaseIdx))
return UnknownVal();
const llvm::APSInt& BaseIdxI = cast<nonloc::ConcreteInt>(BaseIdx).getValue();
const llvm::APSInt& OffI = cast<nonloc::ConcreteInt>(Offset).getValue();
assert(BaseIdxI.isSigned());
// FIXME: This appears to be the assumption of this code. We should review
// whether or not BaseIdxI.getBitWidth() < OffI.getBitWidth(). If it
// can't we need to put a comment here. If it can, we should handle it.
assert(BaseIdxI.getBitWidth() >= OffI.getBitWidth());
const MemRegion *ArrayR = ElemR->getSuperRegion();
SVal NewIdx;
if (OffI.isUnsigned() || OffI.getBitWidth() < BaseIdxI.getBitWidth()) {
// 'Offset' might be unsigned. We have to convert it to signed and
// possibly extend it.
llvm::APSInt Tmp = OffI;
if (OffI.getBitWidth() < BaseIdxI.getBitWidth())
Tmp.extend(BaseIdxI.getBitWidth());
Tmp.setIsSigned(true);
Tmp += BaseIdxI; // Compute the new offset.
NewIdx = ValMgr.makeIntVal(Tmp);
}
else
NewIdx = nonloc::ConcreteInt(getBasicVals().getValue(BaseIdxI + OffI));
return loc::MemRegionVal(MRMgr.getElementRegion(elementType, NewIdx, ArrayR,
getContext()));
}
//===----------------------------------------------------------------------===//
// Extents for regions.
//===----------------------------------------------------------------------===//
SVal RegionStoreManager::getSizeInElements(const GRState *state,
const MemRegion* R) {
if (const VarRegion* VR = dyn_cast<VarRegion>(R)) {
// Get the type of the variable.
QualType T = VR->getDesugaredValueType(getContext());
// FIXME: Handle variable-length arrays.
if (isa<VariableArrayType>(T))
return UnknownVal();
if (const ConstantArrayType* CAT = dyn_cast<ConstantArrayType>(T)) {
// return the size as signed integer.
return ValMgr.makeIntVal(CAT->getSize(), false);
}
const QualType* CastTy = state->get<RegionCasts>(VR);
// If the VarRegion is cast to other type, compute the size with respect to
// that type.
if (CastTy) {
QualType EleTy =cast<PointerType>(CastTy->getTypePtr())->getPointeeType();
QualType VarTy = VR->getValueType(getContext());
uint64_t EleSize = getContext().getTypeSize(EleTy);
uint64_t VarSize = getContext().getTypeSize(VarTy);
assert(VarSize != 0);
return ValMgr.makeIntVal(VarSize/EleSize, false);
}
// Clients can use ordinary variables as if they were arrays. These
// essentially are arrays of size 1.
return ValMgr.makeIntVal(1, false);
}
if (const StringRegion* SR = dyn_cast<StringRegion>(R)) {
const StringLiteral* Str = SR->getStringLiteral();
// We intentionally made the size value signed because it participates in
// operations with signed indices.
return ValMgr.makeIntVal(Str->getByteLength()+1, false);
}
if (const FieldRegion* FR = dyn_cast<FieldRegion>(R)) {
// FIXME: Unsupported yet.
FR = 0;
return UnknownVal();
}
if (isa<SymbolicRegion>(R)) {
return UnknownVal();
}
if (isa<AllocaRegion>(R)) {
return UnknownVal();
}
if (isa<ElementRegion>(R)) {
return UnknownVal();
}
assert(0 && "Other regions are not supported yet.");
return UnknownVal();
}
const GRState *RegionStoreManager::setExtent(const GRState *state,
const MemRegion *region,
SVal extent) {
return state->set<RegionExtents>(region, extent);
}
//===----------------------------------------------------------------------===//
// Location and region casting.
//===----------------------------------------------------------------------===//
/// ArrayToPointer - Emulates the "decay" of an array to a pointer
/// type. 'Array' represents the lvalue of the array being decayed
/// to a pointer, and the returned SVal represents the decayed
/// version of that lvalue (i.e., a pointer to the first element of
/// the array). This is called by GRExprEngine when evaluating casts
/// from arrays to pointers.
SVal RegionStoreManager::ArrayToPointer(Loc Array) {
if (!isa<loc::MemRegionVal>(Array))
return UnknownVal();
const MemRegion* R = cast<loc::MemRegionVal>(&Array)->getRegion();
const TypedRegion* ArrayR = dyn_cast<TypedRegion>(R);
if (!ArrayR)
return UnknownVal();
// Strip off typedefs from the ArrayRegion's ValueType.
QualType T = ArrayR->getValueType(getContext())->getDesugaredType();
ArrayType *AT = cast<ArrayType>(T);
T = AT->getElementType();
nonloc::ConcreteInt Idx(getBasicVals().getZeroWithPtrWidth(false));
ElementRegion* ER = MRMgr.getElementRegion(T, Idx, ArrayR, getContext());
return loc::MemRegionVal(ER);
}
RegionStoreManager::CastResult
RegionStoreManager::CastRegion(const GRState *state, const MemRegion* R,
QualType CastToTy) {
ASTContext& Ctx = StateMgr.getContext();
// We need to know the real type of CastToTy.
QualType ToTy = Ctx.getCanonicalType(CastToTy);
// Check cast to ObjCQualifiedID type.
if (ToTy->isObjCQualifiedIdType()) {
// FIXME: Record the type information aside.
return CastResult(state, R);
}
// CodeTextRegion should be cast to only function pointer type.
if (isa<CodeTextRegion>(R)) {
assert(CastToTy->isFunctionPointerType() || CastToTy->isBlockPointerType()
|| (CastToTy->isPointerType()
&& CastToTy->getAsPointerType()->getPointeeType()->isVoidType()));
return CastResult(state, R);
}
// Now assume we are casting from pointer to pointer. Other cases should
// already be handled.
QualType PointeeTy = cast<PointerType>(ToTy.getTypePtr())->getPointeeType();
// Process region cast according to the kind of the region being cast.
// FIXME: Need to handle arbitrary downcasts.
if (isa<SymbolicRegion>(R) || isa<AllocaRegion>(R)) {
state = setCastType(state, R, ToTy);
return CastResult(state, R);
}
// VarRegion, ElementRegion, and FieldRegion has an inherent type. Normally
// they should not be cast. We only layer an ElementRegion when the cast-to
// pointee type is of smaller size. In other cases, we return the original
// VarRegion.
if (isa<VarRegion>(R) || isa<ElementRegion>(R) || isa<FieldRegion>(R)
|| isa<ObjCIvarRegion>(R) || isa<CompoundLiteralRegion>(R)) {
// If the pointee type is incomplete, do not compute its size, and return
// the original region.
if (const RecordType *RT = dyn_cast<RecordType>(PointeeTy.getTypePtr())) {
const RecordDecl *D = RT->getDecl();
if (!D->getDefinition(getContext()))
return CastResult(state, R);
}
QualType ObjTy = cast<TypedRegion>(R)->getValueType(getContext());
uint64_t PointeeTySize = getContext().getTypeSize(PointeeTy);
uint64_t ObjTySize = getContext().getTypeSize(ObjTy);
if ((PointeeTySize > 0 && PointeeTySize < ObjTySize) ||
(ObjTy->isAggregateType() && PointeeTy->isScalarType()) ||
ObjTySize == 0 /* R has 'void*' type. */) {
// Record the cast type of the region.
state = setCastType(state, R, ToTy);
SVal Idx = ValMgr.makeZeroArrayIndex();
ElementRegion* ER = MRMgr.getElementRegion(PointeeTy, Idx,R,getContext());
return CastResult(state, ER);
} else {
state = setCastType(state, R, ToTy);
return CastResult(state, R);
}
}
if (isa<ObjCObjectRegion>(R)) {
return CastResult(state, R);
}
assert(0 && "Unprocessed region.");
return 0;
}
//===----------------------------------------------------------------------===//
// Pointer arithmetic.
//===----------------------------------------------------------------------===//
SVal RegionStoreManager::EvalBinOp(const GRState *state,
BinaryOperator::Opcode Op, Loc L, NonLoc R) {
// Assume the base location is MemRegionVal.
if (!isa<loc::MemRegionVal>(L))
return UnknownVal();
const MemRegion* MR = cast<loc::MemRegionVal>(L).getRegion();
const ElementRegion *ER = 0;
// If the operand is a symbolic or alloca region, create the first element
// region on it.
if (const SymbolicRegion *SR = dyn_cast<SymbolicRegion>(MR)) {
QualType T;
// If the SymbolicRegion was cast to another type, use that type.
if (const QualType *t = state->get<RegionCasts>(SR)) {
T = *t;
} else {
// Otherwise use the symbol's type.
SymbolRef Sym = SR->getSymbol();
T = Sym->getType(getContext());
}
QualType EleTy = T->getAsPointerType()->getPointeeType();
SVal ZeroIdx = ValMgr.makeZeroArrayIndex();
ER = MRMgr.getElementRegion(EleTy, ZeroIdx, SR, getContext());
}
else if (const AllocaRegion *AR = dyn_cast<AllocaRegion>(MR)) {
// Get the alloca region's current cast type.
GRStateTrait<RegionCasts>::lookup_type T = state->get<RegionCasts>(AR);
assert(T && "alloca region has no type.");
QualType EleTy = cast<PointerType>(T->getTypePtr())->getPointeeType();
SVal ZeroIdx = ValMgr.makeZeroArrayIndex();
ER = MRMgr.getElementRegion(EleTy, ZeroIdx, AR, getContext());
}
else if (isa<FieldRegion>(MR)) {
// Not track pointer arithmetic on struct fields.
return UnknownVal();
}
else {
ER = cast<ElementRegion>(MR);
}
SVal Idx = ER->getIndex();
nonloc::ConcreteInt* Base = dyn_cast<nonloc::ConcreteInt>(&Idx);
nonloc::ConcreteInt* Offset = dyn_cast<nonloc::ConcreteInt>(&R);
// Only support concrete integer indexes for now.
if (Base && Offset) {
// FIXME: For now, convert the signedness and bitwidth of offset in case
// they don't match. This can result from pointer arithmetic. In reality,
// we should figure out what are the proper semantics and implement them.
//
// This addresses the test case test/Analysis/ptr-arith.c
//
nonloc::ConcreteInt OffConverted(getBasicVals().Convert(Base->getValue(),
Offset->getValue()));
SVal NewIdx = Base->EvalBinOp(getBasicVals(), Op, OffConverted);
const MemRegion* NewER =
MRMgr.getElementRegion(ER->getElementType(), NewIdx,ER->getSuperRegion(),
getContext());
return ValMgr.makeLoc(NewER);
}
return UnknownVal();
}
//===----------------------------------------------------------------------===//
// Loading values from regions.
//===----------------------------------------------------------------------===//
SVal RegionStoreManager::Retrieve(const GRState *state, Loc L, QualType T) {
assert(!isa<UnknownVal>(L) && "location unknown");
assert(!isa<UndefinedVal>(L) && "location undefined");
// FIXME: Is this even possible? Shouldn't this be treated as a null
// dereference at a higher level?
if (isa<loc::ConcreteInt>(L))
return UndefinedVal();
const MemRegion *MR = cast<loc::MemRegionVal>(L).getRegion();
// FIXME: return symbolic value for these cases.
// Example:
// void f(int* p) { int x = *p; }
// char* p = alloca();
// read(p);
// c = *p;
if (isa<SymbolicRegion>(MR) || isa<AllocaRegion>(MR))
return UnknownVal();
// FIXME: Perhaps this method should just take a 'const MemRegion*' argument
// instead of 'Loc', and have the other Loc cases handled at a higher level.
const TypedRegion *R = cast<TypedRegion>(MR);
assert(R && "bad region");
if (const FieldRegion* FR = dyn_cast<FieldRegion>(R))
return RetrieveField(state, FR);
if (const ElementRegion* ER = dyn_cast<ElementRegion>(R))
return RetrieveElement(state, ER);
// FIXME: We should eventually handle funny addressing. e.g.:
//
// int x = ...;
// int *p = &x;
// char *q = (char*) p;
// char c = *q; // returns the first byte of 'x'.
//
// Such funny addressing will occur due to layering of regions.
QualType RTy = R->getValueType(getContext());
if (RTy->isStructureType())
return RetrieveStruct(state, R);
if (RTy->isArrayType())
return RetrieveArray(state, R);
// FIXME: handle Vector types.
if (RTy->isVectorType())
return UnknownVal();
RegionBindingsTy B = GetRegionBindings(state->getStore());
RegionBindingsTy::data_type* V = B.lookup(R);
// Check if the region has a binding.
if (V)
return *V;
if (const ObjCIvarRegion *IVR = dyn_cast<ObjCIvarRegion>(R)) {
const MemRegion *SR = IVR->getSuperRegion();
// If the super region is 'self' then return the symbol representing
// the value of the ivar upon entry to the method.
if (SR == SelfRegion) {
// FIXME: Do we need to handle the case where the super region
// has a view? We want to canonicalize the bindings.
return ValMgr.getRegionValueSymbolVal(R);
}
// Otherwise, we need a new symbol. For now return Unknown.
return UnknownVal();
}
// The location does not have a bound value. This means that it has
// the value it had upon its creation and/or entry to the analyzed
// function/method. These are either symbolic values or 'undefined'.
// We treat function parameters as symbolic values.
if (const VarRegion* VR = dyn_cast<VarRegion>(R)) {
const VarDecl *VD = VR->getDecl();
if (VD == SelfDecl)
return loc::MemRegionVal(getSelfRegion(0));
if (isa<ParmVarDecl>(VD) || isa<ImplicitParamDecl>(VD) ||
VD->hasGlobalStorage()) {
QualType VTy = VD->getType();
if (Loc::IsLocType(VTy) || VTy->isIntegerType())
return ValMgr.getRegionValueSymbolVal(VR);
else
return UnknownVal();
}
}
if (R->hasHeapOrStackStorage()) {
// All stack variables are considered to have undefined values
// upon creation. All heap allocated blocks are considered to
// have undefined values as well unless they are explicitly bound
// to specific values.
return UndefinedVal();
}
// If the region is already cast to another type, use that type to create the
// symbol value.
if (const QualType *p = state->get<RegionCasts>(R)) {
QualType T = *p;
RTy = T->getAsPointerType()->getPointeeType();
}
// All other integer values are symbolic.
if (Loc::IsLocType(RTy) || RTy->isIntegerType())
return ValMgr.getRegionValueSymbolVal(R, RTy);
else
return UnknownVal();
}
SVal RegionStoreManager::RetrieveElement(const GRState* state,
const ElementRegion* R) {
// Check if the region has a binding.
RegionBindingsTy B = GetRegionBindings(state->getStore());
const SVal* V = B.lookup(R);
if (V)
return *V;
// Check if the region is an element region of a string literal.
if (const StringRegion *StrR=dyn_cast<StringRegion>(R->getSuperRegion())) {
const StringLiteral *Str = StrR->getStringLiteral();
SVal Idx = R->getIndex();
if (nonloc::ConcreteInt *CI = dyn_cast<nonloc::ConcreteInt>(&Idx)) {
int64_t i = CI->getValue().getSExtValue();
char c;
if (i == Str->getByteLength())
c = '\0';
else
c = Str->getStrData()[i];
return ValMgr.makeIntVal(c, getContext().CharTy);
}
}
const MemRegion* SuperR = R->getSuperRegion();
const SVal* D = state->get<RegionDefaultValue>(SuperR);
if (D) {
if (D->hasConjuredSymbol())
return ValMgr.getRegionValueSymbolVal(R);
else
return *D;
}
if (R->hasHeapOrStackStorage())
return UndefinedVal();
QualType Ty = R->getValueType(getContext());
// If the region is already cast to another type, use that type to create the
// symbol value.
if (const QualType *p = state->get<RegionCasts>(R))
Ty = (*p)->getAsPointerType()->getPointeeType();
if (Loc::IsLocType(Ty) || Ty->isIntegerType())
return ValMgr.getRegionValueSymbolVal(R, Ty);
else
return UnknownVal();
}
SVal RegionStoreManager::RetrieveField(const GRState* state,
const FieldRegion* R) {
QualType Ty = R->getValueType(getContext());
// Check if the region has a binding.
RegionBindingsTy B = GetRegionBindings(state->getStore());
const SVal* V = B.lookup(R);
if (V)
return *V;
const MemRegion* SuperR = R->getSuperRegion();
const SVal* D = state->get<RegionDefaultValue>(SuperR);
if (D) {
if (D->hasConjuredSymbol())
return ValMgr.getRegionValueSymbolVal(R);
if (D->isZeroConstant())
return ValMgr.makeZeroVal(Ty);
if (D->isUnknown())
return *D;
assert(0 && "Unknown default value");
}
if (R->hasHeapOrStackStorage())
return UndefinedVal();
// If the region is already cast to another type, use that type to create the
// symbol value.
if (const QualType *p = state->get<RegionCasts>(R)) {
QualType tmp = *p;
Ty = tmp->getAsPointerType()->getPointeeType();
}
// All other integer values are symbolic.
if (Loc::IsLocType(Ty) || Ty->isIntegerType())
return ValMgr.getRegionValueSymbolVal(R, Ty);
else
return UnknownVal();
}
SVal RegionStoreManager::RetrieveStruct(const GRState *state,
const TypedRegion* R){
QualType T = R->getValueType(getContext());
assert(T->isStructureType());
const RecordType* RT = T->getAsStructureType();
RecordDecl* RD = RT->getDecl();
assert(RD->isDefinition());
llvm::ImmutableList<SVal> StructVal = getBasicVals().getEmptySValList();
// FIXME: We shouldn't use a std::vector. If RecordDecl doesn't have a
// reverse iterator, we should implement one.
std::vector<FieldDecl *> Fields(RD->field_begin(getContext()),
RD->field_end(getContext()));
for (std::vector<FieldDecl *>::reverse_iterator Field = Fields.rbegin(),
FieldEnd = Fields.rend();
Field != FieldEnd; ++Field) {
FieldRegion* FR = MRMgr.getFieldRegion(*Field, R);
QualType FTy = (*Field)->getType();
SVal FieldValue = Retrieve(state, loc::MemRegionVal(FR), FTy);
StructVal = getBasicVals().consVals(FieldValue, StructVal);
}
return ValMgr.makeCompoundVal(T, StructVal);
}
SVal RegionStoreManager::RetrieveArray(const GRState *state,
const TypedRegion * R) {
QualType T = R->getValueType(getContext());
ConstantArrayType* CAT = cast<ConstantArrayType>(T.getTypePtr());
llvm::ImmutableList<SVal> ArrayVal = getBasicVals().getEmptySValList();
llvm::APSInt Size(CAT->getSize(), false);
llvm::APSInt i = getBasicVals().getZeroWithPtrWidth(false);
for (; i < Size; ++i) {
SVal Idx = ValMgr.makeIntVal(i);
ElementRegion* ER = MRMgr.getElementRegion(CAT->getElementType(), Idx, R,
getContext());
QualType ETy = ER->getElementType();
SVal ElementVal = Retrieve(state, loc::MemRegionVal(ER), ETy);
ArrayVal = getBasicVals().consVals(ElementVal, ArrayVal);
}
return ValMgr.makeCompoundVal(T, ArrayVal);
}
//===----------------------------------------------------------------------===//
// Binding values to regions.
//===----------------------------------------------------------------------===//
Store RegionStoreManager::Remove(Store store, Loc L) {
const MemRegion* R = 0;
if (isa<loc::MemRegionVal>(L))
R = cast<loc::MemRegionVal>(L).getRegion();
if (R) {
RegionBindingsTy B = GetRegionBindings(store);
return RBFactory.Remove(B, R).getRoot();
}
return store;
}
const GRState *RegionStoreManager::Bind(const GRState *state, Loc L, SVal V) {
// If we get here, the location should be a region.
const MemRegion* R = cast<loc::MemRegionVal>(L).getRegion();
// Check if the region is a struct region.
if (const TypedRegion* TR = dyn_cast<TypedRegion>(R))
if (TR->getValueType(getContext())->isStructureType())
return BindStruct(state, TR, V);
RegionBindingsTy B = GetRegionBindings(state->getStore());
B = RBFactory.Add(B, R, V);
return state->makeWithStore(B.getRoot());
}
const GRState *RegionStoreManager::BindDecl(const GRState *state,
const VarDecl* VD, SVal InitVal) {
QualType T = VD->getType();
VarRegion* VR = MRMgr.getVarRegion(VD);
if (T->isArrayType())
return BindArray(state, VR, InitVal);
if (T->isStructureType())
return BindStruct(state, VR, InitVal);
return Bind(state, ValMgr.makeLoc(VR), InitVal);
}
// FIXME: this method should be merged into Bind().
const GRState *
RegionStoreManager::BindCompoundLiteral(const GRState *state,
const CompoundLiteralExpr* CL,
SVal V) {
CompoundLiteralRegion* R = MRMgr.getCompoundLiteralRegion(CL);
return Bind(state, loc::MemRegionVal(R), V);
}
const GRState *RegionStoreManager::BindArray(const GRState *state,
const TypedRegion* R,
SVal Init) {
QualType T = R->getValueType(getContext());
ConstantArrayType* CAT = cast<ConstantArrayType>(T.getTypePtr());
QualType ElementTy = CAT->getElementType();
llvm::APSInt Size(CAT->getSize(), false);
llvm::APSInt i(llvm::APInt::getNullValue(Size.getBitWidth()), false);
// Check if the init expr is a StringLiteral.
if (isa<loc::MemRegionVal>(Init)) {
const MemRegion* InitR = cast<loc::MemRegionVal>(Init).getRegion();
const StringLiteral* S = cast<StringRegion>(InitR)->getStringLiteral();
const char* str = S->getStrData();
unsigned len = S->getByteLength();
unsigned j = 0;
// Copy bytes from the string literal into the target array. Trailing bytes
// in the array that are not covered by the string literal are initialized
// to zero.
for (; i < Size; ++i, ++j) {
if (j >= len)
break;
SVal Idx = ValMgr.makeIntVal(i);
ElementRegion* ER = MRMgr.getElementRegion(ElementTy, Idx,R,getContext());
SVal V = ValMgr.makeIntVal(str[j], sizeof(char)*8, true);
state = Bind(state, loc::MemRegionVal(ER), V);
}
return state;
}
nonloc::CompoundVal& CV = cast<nonloc::CompoundVal>(Init);
nonloc::CompoundVal::iterator VI = CV.begin(), VE = CV.end();
for (; i < Size; ++i, ++VI) {
// The init list might be shorter than the array length.
if (VI == VE)
break;
SVal Idx = ValMgr.makeIntVal(i);
ElementRegion* ER = MRMgr.getElementRegion(ElementTy, Idx, R, getContext());
if (CAT->getElementType()->isStructureType())
state = BindStruct(state, ER, *VI);
else
state = Bind(state, ValMgr.makeLoc(ER), *VI);
}
// If the init list is shorter than the array length, set the array default
// value.
if (i < Size) {
if (ElementTy->isIntegerType()) {
SVal V = ValMgr.makeZeroVal(ElementTy);
state = setDefaultValue(state, R, V);
}
}
return state;
}
const GRState *
RegionStoreManager::BindStruct(const GRState *state, const TypedRegion* R,
SVal V) {
if (!Features.supportsFields())
return state;
QualType T = R->getValueType(getContext());
assert(T->isStructureType());
const RecordType* RT = T->getAsRecordType();
RecordDecl* RD = RT->getDecl();
if (!RD->isDefinition())
return state;
// We may get non-CompoundVal accidentally due to imprecise cast logic.
// Ignore them and kill the field values.
if (V.isUnknown() || !isa<nonloc::CompoundVal>(V))
return KillStruct(state, R);
nonloc::CompoundVal& CV = cast<nonloc::CompoundVal>(V);
nonloc::CompoundVal::iterator VI = CV.begin(), VE = CV.end();
RecordDecl::field_iterator FI, FE;
for (FI = RD->field_begin(getContext()), FE = RD->field_end(getContext());
FI != FE; ++FI, ++VI) {
if (VI == VE)
break;
QualType FTy = (*FI)->getType();
FieldRegion* FR = MRMgr.getFieldRegion(*FI, R);
if (Loc::IsLocType(FTy) || FTy->isIntegerType())
state = Bind(state, ValMgr.makeLoc(FR), *VI);
else if (FTy->isArrayType())
state = BindArray(state, FR, *VI);
else if (FTy->isStructureType())
state = BindStruct(state, FR, *VI);
}
// There may be fewer values in the initialize list than the fields of struct.
if (FI != FE)
state = setDefaultValue(state, R, ValMgr.makeIntVal(0, false));
return state;
}
const GRState *RegionStoreManager::KillStruct(const GRState *state,
const TypedRegion* R){
// Set the default value of the struct region to "unknown".
state = state->set<RegionDefaultValue>(R, UnknownVal());
// Remove all bindings for the subregions of the struct.
Store store = state->getStore();
RegionBindingsTy B = GetRegionBindings(store);
for (RegionBindingsTy::iterator I = B.begin(), E = B.end(); I != E; ++I) {
const MemRegion* R = I.getKey();
if (const SubRegion* subRegion = dyn_cast<SubRegion>(R))
if (subRegion->isSubRegionOf(R))
store = Remove(store, ValMgr.makeLoc(subRegion));
}
return state->makeWithStore(store);
}
//===----------------------------------------------------------------------===//
// Region views.
//===----------------------------------------------------------------------===//
const GRState *RegionStoreManager::AddRegionView(const GRState *state,
const MemRegion* View,
const MemRegion* Base) {
// First, retrieve the region view of the base region.
const RegionViews* d = state->get<RegionViewMap>(Base);
RegionViews L = d ? *d : RVFactory.GetEmptySet();
// Now add View to the region view.
L = RVFactory.Add(L, View);
// Create a new state with the new region view.
return state->set<RegionViewMap>(Base, L);
}
const GRState *RegionStoreManager::RemoveRegionView(const GRState *state,
const MemRegion* View,
const MemRegion* Base) {
// Retrieve the region view of the base region.
const RegionViews* d = state->get<RegionViewMap>(Base);
// If the base region has no view, return.
if (!d)
return state;
// Remove the view.
return state->set<RegionViewMap>(Base, RVFactory.Remove(*d, View));
}
const GRState *RegionStoreManager::setCastType(const GRState *state,
const MemRegion* R, QualType T) {
return state->set<RegionCasts>(R, T);
}
const GRState *RegionStoreManager::setDefaultValue(const GRState *state,
const MemRegion* R, SVal V) {
return state->set<RegionDefaultValue>(R, V);
}
//===----------------------------------------------------------------------===//
// State pruning.
//===----------------------------------------------------------------------===//
static void UpdateLiveSymbols(SVal X, SymbolReaper& SymReaper) {
if (loc::MemRegionVal *XR = dyn_cast<loc::MemRegionVal>(&X)) {
const MemRegion *R = XR->getRegion();
while (R) {
if (const SymbolicRegion *SR = dyn_cast<SymbolicRegion>(R)) {
SymReaper.markLive(SR->getSymbol());
return;
}
if (const SubRegion *SR = dyn_cast<SubRegion>(R)) {
R = SR->getSuperRegion();
continue;
}
break;
}
return;
}
for (SVal::symbol_iterator SI=X.symbol_begin(), SE=X.symbol_end();SI!=SE;++SI)
SymReaper.markLive(*SI);
}
Store RegionStoreManager::RemoveDeadBindings(const GRState *state, Stmt* Loc,
SymbolReaper& SymReaper,
llvm::SmallVectorImpl<const MemRegion*>& RegionRoots)
{
Store store = state->getStore();
RegionBindingsTy B = GetRegionBindings(store);
// Lazily constructed backmap from MemRegions to SubRegions.
typedef llvm::ImmutableSet<const MemRegion*> SubRegionsTy;
typedef llvm::ImmutableMap<const MemRegion*, SubRegionsTy> SubRegionsMapTy;
// FIXME: As a future optimization we can modifiy BumpPtrAllocator to have
// the ability to reuse memory. This way we can keep TmpAlloc around as
// an instance variable of RegionStoreManager (avoiding repeated malloc
// overhead).
llvm::BumpPtrAllocator TmpAlloc;
// Factory objects.
SubRegionsMapTy::Factory SubRegMapF(TmpAlloc);
SubRegionsTy::Factory SubRegF(TmpAlloc);
// The backmap from regions to subregions.
SubRegionsMapTy SubRegMap = SubRegMapF.GetEmptyMap();
// Do a pass over the regions in the store. For VarRegions we check if
// the variable is still live and if so add it to the list of live roots.
// For other regions we populate our region backmap.
llvm::SmallVector<const MemRegion*, 10> IntermediateRoots;
for (RegionBindingsTy::iterator I = B.begin(), E = B.end(); I != E; ++I) {
IntermediateRoots.push_back(I.getKey());
}
while (!IntermediateRoots.empty()) {
const MemRegion* R = IntermediateRoots.back();
IntermediateRoots.pop_back();
if (const VarRegion* VR = dyn_cast<VarRegion>(R)) {
if (SymReaper.isLive(Loc, VR->getDecl()))
RegionRoots.push_back(VR); // This is a live "root".
}
else if (const SymbolicRegion* SR = dyn_cast<SymbolicRegion>(R)) {
if (SymReaper.isLive(SR->getSymbol()))
RegionRoots.push_back(SR);
}
else {
// Get the super region for R.
const MemRegion* SuperR = cast<SubRegion>(R)->getSuperRegion();
// Get the current set of subregions for SuperR.
const SubRegionsTy* SRptr = SubRegMap.lookup(SuperR);
SubRegionsTy SRs = SRptr ? *SRptr : SubRegF.GetEmptySet();
// Add R to the subregions of SuperR.
SubRegMap = SubRegMapF.Add(SubRegMap, SuperR, SubRegF.Add(SRs, R));
// Super region may be VarRegion or subregion of another VarRegion. Add it
// to the work list.
if (isa<SubRegion>(SuperR))
IntermediateRoots.push_back(SuperR);
}
}
// Process the worklist of RegionRoots. This performs a "mark-and-sweep"
// of the store. We want to find all live symbols and dead regions.
llvm::SmallPtrSet<const MemRegion*, 10> Marked;
while (!RegionRoots.empty()) {
// Dequeue the next region on the worklist.
const MemRegion* R = RegionRoots.back();
RegionRoots.pop_back();
// Check if we have already processed this region.
if (Marked.count(R)) continue;
// Mark this region as processed. This is needed for termination in case
// a region is referenced more than once.
Marked.insert(R);
// Mark the symbol for any live SymbolicRegion as "live". This means we
// should continue to track that symbol.
if (const SymbolicRegion* SymR = dyn_cast<SymbolicRegion>(R))
SymReaper.markLive(SymR->getSymbol());
// Get the data binding for R (if any).
RegionBindingsTy::data_type* Xptr = B.lookup(R);
if (Xptr) {
SVal X = *Xptr;
UpdateLiveSymbols(X, SymReaper); // Update the set of live symbols.
// If X is a region, then add it the RegionRoots.
if (loc::MemRegionVal* RegionX = dyn_cast<loc::MemRegionVal>(&X))
RegionRoots.push_back(RegionX->getRegion());
}
// Get the subregions of R. These are RegionRoots as well since they
// represent values that are also bound to R.
const SubRegionsTy* SRptr = SubRegMap.lookup(R);
if (!SRptr) continue;
SubRegionsTy SR = *SRptr;
for (SubRegionsTy::iterator I=SR.begin(), E=SR.end(); I!=E; ++I)
RegionRoots.push_back(*I);
}
// We have now scanned the store, marking reachable regions and symbols
// as live. We now remove all the regions that are dead from the store
// as well as update DSymbols with the set symbols that are now dead.
for (RegionBindingsTy::iterator I = B.begin(), E = B.end(); I != E; ++I) {
const MemRegion* R = I.getKey();
// If this region live? Is so, none of its symbols are dead.
if (Marked.count(R))
continue;
// Remove this dead region from the store.
store = Remove(store, ValMgr.makeLoc(R));
// Mark all non-live symbols that this region references as dead.
if (const SymbolicRegion* SymR = dyn_cast<SymbolicRegion>(R))
SymReaper.maybeDead(SymR->getSymbol());
SVal X = I.getData();
SVal::symbol_iterator SI = X.symbol_begin(), SE = X.symbol_end();
for (; SI != SE; ++SI) SymReaper.maybeDead(*SI);
}
return store;
}
//===----------------------------------------------------------------------===//
// Utility methods.
//===----------------------------------------------------------------------===//
void RegionStoreManager::print(Store store, llvm::raw_ostream& OS,
const char* nl, const char *sep) {
RegionBindingsTy B = GetRegionBindings(store);
OS << "Store:" << nl;
for (RegionBindingsTy::iterator I = B.begin(), E = B.end(); I != E; ++I) {
OS << ' '; I.getKey()->print(OS); OS << " : ";
I.getData().print(OS); OS << nl;
}
}
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