RetainCountChecker.cpp [plain text]
#include "ClangSACheckers.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/DeclCXX.h"
#include "clang/Basic/LangOptions.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Analysis/DomainSpecific/CocoaConventions.h"
#include "clang/AST/ParentMap.h"
#include "clang/StaticAnalyzer/Core/Checker.h"
#include "clang/StaticAnalyzer/Core/CheckerManager.h"
#include "clang/StaticAnalyzer/Core/BugReporter/BugType.h"
#include "clang/StaticAnalyzer/Core/BugReporter/PathDiagnostic.h"
#include "clang/StaticAnalyzer/Core/PathSensitive/CallEvent.h"
#include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h"
#include "clang/StaticAnalyzer/Core/PathSensitive/ProgramStateTrait.h"
#include "clang/StaticAnalyzer/Core/PathSensitive/SymbolManager.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/FoldingSet.h"
#include "llvm/ADT/ImmutableList.h"
#include "llvm/ADT/ImmutableMap.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringExtras.h"
#include <cstdarg>
using namespace clang;
using namespace ento;
using llvm::StrInStrNoCase;
enum ArgEffect { DoNothing, Autorelease, Dealloc, DecRef, DecRefMsg,
DecRefBridgedTransfered,
IncRefMsg, IncRef, MakeCollectable, MayEscape,
NewAutoreleasePool,
StopTracking,
StopTrackingHard,
DecRefAndStopTrackingHard, DecRefMsgAndStopTrackingHard
};
namespace llvm {
template <> struct FoldingSetTrait<ArgEffect> {
static inline void Profile(const ArgEffect X, FoldingSetNodeID& ID) {
ID.AddInteger((unsigned) X);
}
};
}
typedef llvm::ImmutableMap<unsigned,ArgEffect> ArgEffects;
namespace {
class RetEffect {
public:
enum Kind { NoRet, OwnedSymbol, OwnedAllocatedSymbol,
NotOwnedSymbol, GCNotOwnedSymbol, ARCNotOwnedSymbol,
OwnedWhenTrackedReceiver,
NoRetHard
};
enum ObjKind { CF, ObjC, AnyObj };
private:
Kind K;
ObjKind O;
RetEffect(Kind k, ObjKind o = AnyObj) : K(k), O(o) {}
public:
Kind getKind() const { return K; }
ObjKind getObjKind() const { return O; }
bool isOwned() const {
return K == OwnedSymbol || K == OwnedAllocatedSymbol ||
K == OwnedWhenTrackedReceiver;
}
bool operator==(const RetEffect &Other) const {
return K == Other.K && O == Other.O;
}
static RetEffect MakeOwnedWhenTrackedReceiver() {
return RetEffect(OwnedWhenTrackedReceiver, ObjC);
}
static RetEffect MakeOwned(ObjKind o, bool isAllocated = false) {
return RetEffect(isAllocated ? OwnedAllocatedSymbol : OwnedSymbol, o);
}
static RetEffect MakeNotOwned(ObjKind o) {
return RetEffect(NotOwnedSymbol, o);
}
static RetEffect MakeGCNotOwned() {
return RetEffect(GCNotOwnedSymbol, ObjC);
}
static RetEffect MakeARCNotOwned() {
return RetEffect(ARCNotOwnedSymbol, ObjC);
}
static RetEffect MakeNoRet() {
return RetEffect(NoRet);
}
static RetEffect MakeNoRetHard() {
return RetEffect(NoRetHard);
}
void Profile(llvm::FoldingSetNodeID& ID) const {
ID.AddInteger((unsigned) K);
ID.AddInteger((unsigned) O);
}
};
class RefVal {
public:
enum Kind {
Owned = 0, NotOwned, Released, ReturnedOwned, ReturnedNotOwned, ERROR_START,
ErrorDeallocNotOwned, ErrorDeallocGC, ErrorUseAfterRelease, ErrorReleaseNotOwned, ERROR_LEAK_START,
ErrorLeak, ErrorLeakReturned, ErrorGCLeakReturned,
ErrorOverAutorelease,
ErrorReturnedNotOwned
};
private:
Kind kind;
RetEffect::ObjKind okind;
unsigned Cnt;
unsigned ACnt;
QualType T;
RefVal(Kind k, RetEffect::ObjKind o, unsigned cnt, unsigned acnt, QualType t)
: kind(k), okind(o), Cnt(cnt), ACnt(acnt), T(t) {}
public:
Kind getKind() const { return kind; }
RetEffect::ObjKind getObjKind() const { return okind; }
unsigned getCount() const { return Cnt; }
unsigned getAutoreleaseCount() const { return ACnt; }
unsigned getCombinedCounts() const { return Cnt + ACnt; }
void clearCounts() { Cnt = 0; ACnt = 0; }
void setCount(unsigned i) { Cnt = i; }
void setAutoreleaseCount(unsigned i) { ACnt = i; }
QualType getType() const { return T; }
bool isOwned() const {
return getKind() == Owned;
}
bool isNotOwned() const {
return getKind() == NotOwned;
}
bool isReturnedOwned() const {
return getKind() == ReturnedOwned;
}
bool isReturnedNotOwned() const {
return getKind() == ReturnedNotOwned;
}
static RefVal makeOwned(RetEffect::ObjKind o, QualType t,
unsigned Count = 1) {
return RefVal(Owned, o, Count, 0, t);
}
static RefVal makeNotOwned(RetEffect::ObjKind o, QualType t,
unsigned Count = 0) {
return RefVal(NotOwned, o, Count, 0, t);
}
bool operator==(const RefVal& X) const {
return kind == X.kind && Cnt == X.Cnt && T == X.T && ACnt == X.ACnt;
}
RefVal operator-(size_t i) const {
return RefVal(getKind(), getObjKind(), getCount() - i,
getAutoreleaseCount(), getType());
}
RefVal operator+(size_t i) const {
return RefVal(getKind(), getObjKind(), getCount() + i,
getAutoreleaseCount(), getType());
}
RefVal operator^(Kind k) const {
return RefVal(k, getObjKind(), getCount(), getAutoreleaseCount(),
getType());
}
RefVal autorelease() const {
return RefVal(getKind(), getObjKind(), getCount(), getAutoreleaseCount()+1,
getType());
}
void Profile(llvm::FoldingSetNodeID& ID) const {
ID.AddInteger((unsigned) kind);
ID.AddInteger(Cnt);
ID.AddInteger(ACnt);
ID.Add(T);
}
void print(raw_ostream &Out) const;
};
void RefVal::print(raw_ostream &Out) const {
if (!T.isNull())
Out << "Tracked " << T.getAsString() << '/';
switch (getKind()) {
default: llvm_unreachable("Invalid RefVal kind");
case Owned: {
Out << "Owned";
unsigned cnt = getCount();
if (cnt) Out << " (+ " << cnt << ")";
break;
}
case NotOwned: {
Out << "NotOwned";
unsigned cnt = getCount();
if (cnt) Out << " (+ " << cnt << ")";
break;
}
case ReturnedOwned: {
Out << "ReturnedOwned";
unsigned cnt = getCount();
if (cnt) Out << " (+ " << cnt << ")";
break;
}
case ReturnedNotOwned: {
Out << "ReturnedNotOwned";
unsigned cnt = getCount();
if (cnt) Out << " (+ " << cnt << ")";
break;
}
case Released:
Out << "Released";
break;
case ErrorDeallocGC:
Out << "-dealloc (GC)";
break;
case ErrorDeallocNotOwned:
Out << "-dealloc (not-owned)";
break;
case ErrorLeak:
Out << "Leaked";
break;
case ErrorLeakReturned:
Out << "Leaked (Bad naming)";
break;
case ErrorGCLeakReturned:
Out << "Leaked (GC-ed at return)";
break;
case ErrorUseAfterRelease:
Out << "Use-After-Release [ERROR]";
break;
case ErrorReleaseNotOwned:
Out << "Release of Not-Owned [ERROR]";
break;
case RefVal::ErrorOverAutorelease:
Out << "Over autoreleased";
break;
case RefVal::ErrorReturnedNotOwned:
Out << "Non-owned object returned instead of owned";
break;
}
if (ACnt) {
Out << " [ARC +" << ACnt << ']';
}
}
}
typedef llvm::ImmutableMap<SymbolRef, RefVal> RefBindings;
namespace clang {
namespace ento {
template<>
struct ProgramStateTrait<RefBindings>
: public ProgramStatePartialTrait<RefBindings> {
static void *GDMIndex() {
static int RefBIndex = 0;
return &RefBIndex;
}
};
}
}
static inline const RefVal *getRefBinding(ProgramStateRef State,
SymbolRef Sym) {
return State->get<RefBindings>(Sym);
}
static inline ProgramStateRef setRefBinding(ProgramStateRef State,
SymbolRef Sym, RefVal Val) {
return State->set<RefBindings>(Sym, Val);
}
static ProgramStateRef removeRefBinding(ProgramStateRef State, SymbolRef Sym) {
return State->remove<RefBindings>(Sym);
}
namespace {
class RetainSummary {
ArgEffects Args;
ArgEffect DefaultArgEffect;
ArgEffect Receiver;
RetEffect Ret;
public:
RetainSummary(ArgEffects A, RetEffect R, ArgEffect defaultEff,
ArgEffect ReceiverEff)
: Args(A), DefaultArgEffect(defaultEff), Receiver(ReceiverEff), Ret(R) {}
ArgEffect getArg(unsigned idx) const {
if (const ArgEffect *AE = Args.lookup(idx))
return *AE;
return DefaultArgEffect;
}
void addArg(ArgEffects::Factory &af, unsigned idx, ArgEffect e) {
Args = af.add(Args, idx, e);
}
void setDefaultArgEffect(ArgEffect E) {
DefaultArgEffect = E;
}
RetEffect getRetEffect() const { return Ret; }
void setRetEffect(RetEffect E) { Ret = E; }
void setReceiverEffect(ArgEffect e) { Receiver = e; }
ArgEffect getReceiverEffect() const { return Receiver; }
bool operator==(const RetainSummary &Other) const {
return Args == Other.Args && DefaultArgEffect == Other.DefaultArgEffect &&
Receiver == Other.Receiver && Ret == Other.Ret;
}
void Profile(llvm::FoldingSetNodeID& ID) const {
ID.Add(Args);
ID.Add(DefaultArgEffect);
ID.Add(Receiver);
ID.Add(Ret);
}
bool isSimple() const {
return Args.isEmpty();
}
private:
ArgEffects getArgEffects() const { return Args; }
ArgEffect getDefaultArgEffect() const { return DefaultArgEffect; }
friend class RetainSummaryManager;
};
}
namespace {
class ObjCSummaryKey {
IdentifierInfo* II;
Selector S;
public:
ObjCSummaryKey(IdentifierInfo* ii, Selector s)
: II(ii), S(s) {}
ObjCSummaryKey(const ObjCInterfaceDecl *d, Selector s)
: II(d ? d->getIdentifier() : 0), S(s) {}
ObjCSummaryKey(Selector s)
: II(0), S(s) {}
IdentifierInfo *getIdentifier() const { return II; }
Selector getSelector() const { return S; }
};
}
namespace llvm {
template <> struct DenseMapInfo<ObjCSummaryKey> {
static inline ObjCSummaryKey getEmptyKey() {
return ObjCSummaryKey(DenseMapInfo<IdentifierInfo*>::getEmptyKey(),
DenseMapInfo<Selector>::getEmptyKey());
}
static inline ObjCSummaryKey getTombstoneKey() {
return ObjCSummaryKey(DenseMapInfo<IdentifierInfo*>::getTombstoneKey(),
DenseMapInfo<Selector>::getTombstoneKey());
}
static unsigned getHashValue(const ObjCSummaryKey &V) {
typedef std::pair<IdentifierInfo*, Selector> PairTy;
return DenseMapInfo<PairTy>::getHashValue(PairTy(V.getIdentifier(),
V.getSelector()));
}
static bool isEqual(const ObjCSummaryKey& LHS, const ObjCSummaryKey& RHS) {
return LHS.getIdentifier() == RHS.getIdentifier() &&
LHS.getSelector() == RHS.getSelector();
}
};
template <>
struct isPodLike<ObjCSummaryKey> { static const bool value = true; };
}
namespace {
class ObjCSummaryCache {
typedef llvm::DenseMap<ObjCSummaryKey, const RetainSummary *> MapTy;
MapTy M;
public:
ObjCSummaryCache() {}
const RetainSummary * find(const ObjCInterfaceDecl *D, Selector S) {
ObjCSummaryKey K(D, S);
MapTy::iterator I = M.find(K);
if (I != M.end())
return I->second;
if (!D)
return NULL;
for (ObjCInterfaceDecl *C=D->getSuperClass() ;; C=C->getSuperClass()) {
if ((I = M.find(ObjCSummaryKey(C, S))) != M.end())
break;
if (!C)
return NULL;
}
const RetainSummary *Summ = I->second;
M[K] = Summ;
return Summ;
}
const RetainSummary *find(IdentifierInfo* II, Selector S) {
MapTy::iterator I = M.find(ObjCSummaryKey(II, S));
if (I == M.end())
I = M.find(ObjCSummaryKey(S));
return I == M.end() ? NULL : I->second;
}
const RetainSummary *& operator[](ObjCSummaryKey K) {
return M[K];
}
const RetainSummary *& operator[](Selector S) {
return M[ ObjCSummaryKey(S) ];
}
};
}
namespace {
class RetainSummaryManager {
typedef llvm::DenseMap<const FunctionDecl*, const RetainSummary *>
FuncSummariesTy;
typedef ObjCSummaryCache ObjCMethodSummariesTy;
typedef llvm::FoldingSetNodeWrapper<RetainSummary> CachedSummaryNode;
ASTContext &Ctx;
const bool GCEnabled;
const bool ARCEnabled;
FuncSummariesTy FuncSummaries;
ObjCMethodSummariesTy ObjCClassMethodSummaries;
ObjCMethodSummariesTy ObjCMethodSummaries;
llvm::BumpPtrAllocator BPAlloc;
ArgEffects::Factory AF;
ArgEffects ScratchArgs;
RetEffect ObjCAllocRetE;
RetEffect ObjCInitRetE;
llvm::FoldingSet<CachedSummaryNode> SimpleSummaries;
ArgEffects getArgEffects();
enum UnaryFuncKind { cfretain, cfrelease, cfmakecollectable };
const RetainSummary *getUnarySummary(const FunctionType* FT,
UnaryFuncKind func);
const RetainSummary *getCFSummaryCreateRule(const FunctionDecl *FD);
const RetainSummary *getCFSummaryGetRule(const FunctionDecl *FD);
const RetainSummary *getCFCreateGetRuleSummary(const FunctionDecl *FD);
const RetainSummary *getPersistentSummary(const RetainSummary &OldSumm);
const RetainSummary *getPersistentSummary(RetEffect RetEff,
ArgEffect ReceiverEff = DoNothing,
ArgEffect DefaultEff = MayEscape) {
RetainSummary Summ(getArgEffects(), RetEff, DefaultEff, ReceiverEff);
return getPersistentSummary(Summ);
}
const RetainSummary *getDoNothingSummary() {
return getPersistentSummary(RetEffect::MakeNoRet(), DoNothing, DoNothing);
}
const RetainSummary *getDefaultSummary() {
return getPersistentSummary(RetEffect::MakeNoRet(),
DoNothing, MayEscape);
}
const RetainSummary *getPersistentStopSummary() {
return getPersistentSummary(RetEffect::MakeNoRet(),
StopTracking, StopTracking);
}
void InitializeClassMethodSummaries();
void InitializeMethodSummaries();
private:
void addNSObjectClsMethSummary(Selector S, const RetainSummary *Summ) {
ObjCClassMethodSummaries[S] = Summ;
}
void addNSObjectMethSummary(Selector S, const RetainSummary *Summ) {
ObjCMethodSummaries[S] = Summ;
}
void addClassMethSummary(const char* Cls, const char* name,
const RetainSummary *Summ, bool isNullary = true) {
IdentifierInfo* ClsII = &Ctx.Idents.get(Cls);
Selector S = isNullary ? GetNullarySelector(name, Ctx)
: GetUnarySelector(name, Ctx);
ObjCClassMethodSummaries[ObjCSummaryKey(ClsII, S)] = Summ;
}
void addInstMethSummary(const char* Cls, const char* nullaryName,
const RetainSummary *Summ) {
IdentifierInfo* ClsII = &Ctx.Idents.get(Cls);
Selector S = GetNullarySelector(nullaryName, Ctx);
ObjCMethodSummaries[ObjCSummaryKey(ClsII, S)] = Summ;
}
Selector generateSelector(va_list argp) {
SmallVector<IdentifierInfo*, 10> II;
while (const char* s = va_arg(argp, const char*))
II.push_back(&Ctx.Idents.get(s));
return Ctx.Selectors.getSelector(II.size(), &II[0]);
}
void addMethodSummary(IdentifierInfo *ClsII, ObjCMethodSummariesTy& Summaries,
const RetainSummary * Summ, va_list argp) {
Selector S = generateSelector(argp);
Summaries[ObjCSummaryKey(ClsII, S)] = Summ;
}
void addInstMethSummary(const char* Cls, const RetainSummary * Summ, ...) {
va_list argp;
va_start(argp, Summ);
addMethodSummary(&Ctx.Idents.get(Cls), ObjCMethodSummaries, Summ, argp);
va_end(argp);
}
void addClsMethSummary(const char* Cls, const RetainSummary * Summ, ...) {
va_list argp;
va_start(argp, Summ);
addMethodSummary(&Ctx.Idents.get(Cls),ObjCClassMethodSummaries, Summ, argp);
va_end(argp);
}
void addClsMethSummary(IdentifierInfo *II, const RetainSummary * Summ, ...) {
va_list argp;
va_start(argp, Summ);
addMethodSummary(II, ObjCClassMethodSummaries, Summ, argp);
va_end(argp);
}
public:
RetainSummaryManager(ASTContext &ctx, bool gcenabled, bool usesARC)
: Ctx(ctx),
GCEnabled(gcenabled),
ARCEnabled(usesARC),
AF(BPAlloc), ScratchArgs(AF.getEmptyMap()),
ObjCAllocRetE(gcenabled
? RetEffect::MakeGCNotOwned()
: (usesARC ? RetEffect::MakeARCNotOwned()
: RetEffect::MakeOwned(RetEffect::ObjC, true))),
ObjCInitRetE(gcenabled
? RetEffect::MakeGCNotOwned()
: (usesARC ? RetEffect::MakeARCNotOwned()
: RetEffect::MakeOwnedWhenTrackedReceiver())) {
InitializeClassMethodSummaries();
InitializeMethodSummaries();
}
const RetainSummary *getSummary(const CallEvent &Call,
ProgramStateRef State = 0);
const RetainSummary *getFunctionSummary(const FunctionDecl *FD);
const RetainSummary *getMethodSummary(Selector S, const ObjCInterfaceDecl *ID,
const ObjCMethodDecl *MD,
QualType RetTy,
ObjCMethodSummariesTy &CachedSummaries);
const RetainSummary *getInstanceMethodSummary(const ObjCMethodCall &M,
ProgramStateRef State);
const RetainSummary *getClassMethodSummary(const ObjCMethodCall &M) {
assert(!M.isInstanceMessage());
const ObjCInterfaceDecl *Class = M.getReceiverInterface();
return getMethodSummary(M.getSelector(), Class, M.getDecl(),
M.getResultType(), ObjCClassMethodSummaries);
}
const RetainSummary *getMethodSummary(const ObjCMethodDecl *MD) {
const ObjCInterfaceDecl *ID = MD->getClassInterface();
Selector S = MD->getSelector();
QualType ResultTy = MD->getResultType();
ObjCMethodSummariesTy *CachedSummaries;
if (MD->isInstanceMethod())
CachedSummaries = &ObjCMethodSummaries;
else
CachedSummaries = &ObjCClassMethodSummaries;
return getMethodSummary(S, ID, MD, ResultTy, *CachedSummaries);
}
const RetainSummary *getStandardMethodSummary(const ObjCMethodDecl *MD,
Selector S, QualType RetTy);
void updateSummaryFromAnnotations(const RetainSummary *&Summ,
const ObjCMethodDecl *MD);
void updateSummaryFromAnnotations(const RetainSummary *&Summ,
const FunctionDecl *FD);
void updateSummaryForCall(const RetainSummary *&Summ,
const CallEvent &Call);
bool isGCEnabled() const { return GCEnabled; }
bool isARCEnabled() const { return ARCEnabled; }
bool isARCorGCEnabled() const { return GCEnabled || ARCEnabled; }
RetEffect getObjAllocRetEffect() const { return ObjCAllocRetE; }
friend class RetainSummaryTemplate;
};
class RetainSummaryTemplate {
RetainSummaryManager &Manager;
const RetainSummary *&RealSummary;
RetainSummary ScratchSummary;
bool Accessed;
public:
RetainSummaryTemplate(const RetainSummary *&real, RetainSummaryManager &mgr)
: Manager(mgr), RealSummary(real), ScratchSummary(*real), Accessed(false) {}
~RetainSummaryTemplate() {
if (Accessed)
RealSummary = Manager.getPersistentSummary(ScratchSummary);
}
RetainSummary &operator*() {
Accessed = true;
return ScratchSummary;
}
RetainSummary *operator->() {
Accessed = true;
return &ScratchSummary;
}
};
}
ArgEffects RetainSummaryManager::getArgEffects() {
ArgEffects AE = ScratchArgs;
ScratchArgs = AF.getEmptyMap();
return AE;
}
const RetainSummary *
RetainSummaryManager::getPersistentSummary(const RetainSummary &OldSumm) {
if (OldSumm.isSimple()) {
llvm::FoldingSetNodeID ID;
OldSumm.Profile(ID);
void *Pos;
CachedSummaryNode *N = SimpleSummaries.FindNodeOrInsertPos(ID, Pos);
if (!N) {
N = (CachedSummaryNode *) BPAlloc.Allocate<CachedSummaryNode>();
new (N) CachedSummaryNode(OldSumm);
SimpleSummaries.InsertNode(N, Pos);
}
return &N->getValue();
}
RetainSummary *Summ = (RetainSummary *) BPAlloc.Allocate<RetainSummary>();
new (Summ) RetainSummary(OldSumm);
return Summ;
}
static bool isRetain(const FunctionDecl *FD, StringRef FName) {
return FName.endswith("Retain");
}
static bool isRelease(const FunctionDecl *FD, StringRef FName) {
return FName.endswith("Release");
}
static bool isMakeCollectable(const FunctionDecl *FD, StringRef FName) {
return FName.find("MakeCollectable") != StringRef::npos;
}
static ArgEffect getStopTrackingHardEquivalent(ArgEffect E) {
switch (E) {
case DoNothing:
case Autorelease:
case DecRefBridgedTransfered:
case IncRef:
case IncRefMsg:
case MakeCollectable:
case MayEscape:
case NewAutoreleasePool:
case StopTracking:
case StopTrackingHard:
return StopTrackingHard;
case DecRef:
case DecRefAndStopTrackingHard:
return DecRefAndStopTrackingHard;
case DecRefMsg:
case DecRefMsgAndStopTrackingHard:
return DecRefMsgAndStopTrackingHard;
case Dealloc:
return Dealloc;
}
llvm_unreachable("Unknown ArgEffect kind");
}
void RetainSummaryManager::updateSummaryForCall(const RetainSummary *&S,
const CallEvent &Call) {
if (Call.hasNonZeroCallbackArg()) {
ArgEffect RecEffect =
getStopTrackingHardEquivalent(S->getReceiverEffect());
ArgEffect DefEffect =
getStopTrackingHardEquivalent(S->getDefaultArgEffect());
ArgEffects CustomArgEffects = S->getArgEffects();
for (ArgEffects::iterator I = CustomArgEffects.begin(),
E = CustomArgEffects.end();
I != E; ++I) {
ArgEffect Translated = getStopTrackingHardEquivalent(I->second);
if (Translated != DefEffect)
ScratchArgs = AF.add(ScratchArgs, I->first, Translated);
}
RetEffect RE = RetEffect::MakeNoRetHard();
if (const FunctionCall *FC = dyn_cast<FunctionCall>(&Call)) {
if (IdentifierInfo *Name = FC->getDecl()->getIdentifier()) {
if (Name->isStr("CGBitmapContextCreateWithData"))
RE = S->getRetEffect();
}
}
S = getPersistentSummary(RE, RecEffect, DefEffect);
}
if (const ObjCMethodCall *MC = dyn_cast<ObjCMethodCall>(&Call)) {
if (MC->getMethodFamily() == OMF_init && MC->isReceiverSelfOrSuper()) {
const Expr *ME = MC->getOriginExpr();
const LocationContext *LCtx = MC->getLocationContext();
ParentMap &PM = LCtx->getAnalysisDeclContext()->getParentMap();
if (!PM.isConsumedExpr(ME)) {
RetainSummaryTemplate ModifiableSummaryTemplate(S, *this);
ModifiableSummaryTemplate->setReceiverEffect(DoNothing);
ModifiableSummaryTemplate->setRetEffect(RetEffect::MakeNoRet());
}
}
}
}
const RetainSummary *
RetainSummaryManager::getSummary(const CallEvent &Call,
ProgramStateRef State) {
const RetainSummary *Summ;
switch (Call.getKind()) {
case CE_Function:
Summ = getFunctionSummary(cast<FunctionCall>(Call).getDecl());
break;
case CE_CXXMember:
case CE_CXXMemberOperator:
case CE_Block:
case CE_CXXConstructor:
case CE_CXXDestructor:
case CE_CXXAllocator:
return getPersistentStopSummary();
case CE_ObjCMessage: {
const ObjCMethodCall &Msg = cast<ObjCMethodCall>(Call);
if (Msg.isInstanceMessage())
Summ = getInstanceMethodSummary(Msg, State);
else
Summ = getClassMethodSummary(Msg);
break;
}
}
updateSummaryForCall(Summ, Call);
assert(Summ && "Unknown call type?");
return Summ;
}
const RetainSummary *
RetainSummaryManager::getFunctionSummary(const FunctionDecl *FD) {
if (!FD)
return getDefaultSummary();
FuncSummariesTy::iterator I = FuncSummaries.find(FD);
if (I != FuncSummaries.end())
return I->second;
const RetainSummary *S = 0;
bool AllowAnnotations = true;
do {
if (FD->isImplicit()) {
S = getPersistentStopSummary();
break;
}
const FunctionType* FT = FD->getType()->getAs<FunctionType>();
const IdentifierInfo *II = FD->getIdentifier();
if (!II)
break;
StringRef FName = II->getName();
FName = FName.substr(FName.find_first_not_of('_'));
QualType RetTy = FT->getResultType();
assert(ScratchArgs.isEmpty());
if (FName == "pthread_create" || FName == "pthread_setspecific") {
S = getPersistentStopSummary();
} else if (FName == "NSMakeCollectable") {
S = (RetTy->isObjCIdType())
? getUnarySummary(FT, cfmakecollectable)
: getPersistentStopSummary();
AllowAnnotations = false;
} else if (FName == "CFPlugInInstanceCreate") {
S = getPersistentSummary(RetEffect::MakeNoRet());
} else if (FName == "IOBSDNameMatching" ||
FName == "IOServiceMatching" ||
FName == "IOServiceNameMatching" ||
FName == "IORegistryEntrySearchCFProperty" ||
FName == "IORegistryEntryIDMatching" ||
FName == "IOOpenFirmwarePathMatching") {
S = getPersistentSummary(RetEffect::MakeOwned(RetEffect::CF, true),
DoNothing, DoNothing);
} else if (FName == "IOServiceGetMatchingService" ||
FName == "IOServiceGetMatchingServices") {
ScratchArgs = AF.add(ScratchArgs, 1, DecRef);
S = getPersistentSummary(RetEffect::MakeNoRet(), DoNothing, DoNothing);
} else if (FName == "IOServiceAddNotification" ||
FName == "IOServiceAddMatchingNotification") {
ScratchArgs = AF.add(ScratchArgs, 2, DecRef);
S = getPersistentSummary(RetEffect::MakeNoRet(), DoNothing, DoNothing);
} else if (FName == "CVPixelBufferCreateWithBytes") {
ScratchArgs = AF.add(ScratchArgs, 7, StopTracking);
S = getPersistentSummary(RetEffect::MakeNoRet(), DoNothing, DoNothing);
} else if (FName == "CGBitmapContextCreateWithData") {
ScratchArgs = AF.add(ScratchArgs, 8, StopTracking);
S = getPersistentSummary(RetEffect::MakeOwned(RetEffect::CF, true),
DoNothing, DoNothing);
} else if (FName == "CVPixelBufferCreateWithPlanarBytes") {
ScratchArgs = AF.add(ScratchArgs, 12, StopTracking);
S = getPersistentSummary(RetEffect::MakeNoRet(), DoNothing, DoNothing);
} else if (FName == "dispatch_set_context") {
ScratchArgs = AF.add(ScratchArgs, 1, StopTracking);
S = getPersistentSummary(RetEffect::MakeNoRet(), DoNothing, DoNothing);
} else if (FName.startswith("NSLog")) {
S = getDoNothingSummary();
} else if (FName.startswith("NS") &&
(FName.find("Insert") != StringRef::npos)) {
ScratchArgs = AF.add(ScratchArgs, 1, StopTracking);
ScratchArgs = AF.add(ScratchArgs, 2, StopTracking);
S = getPersistentSummary(RetEffect::MakeNoRet(), DoNothing, DoNothing);
}
if (S)
break;
if (RetTy->isPointerType()) {
if (FD->getAttr<CFAuditedTransferAttr>()) {
S = getCFCreateGetRuleSummary(FD);
break;
}
if (cocoa::isRefType(RetTy, "CF", FName)) {
if (isRetain(FD, FName))
S = getUnarySummary(FT, cfretain);
else if (isMakeCollectable(FD, FName))
S = getUnarySummary(FT, cfmakecollectable);
else
S = getCFCreateGetRuleSummary(FD);
break;
}
if (cocoa::isRefType(RetTy, "CG", FName)) {
if (isRetain(FD, FName))
S = getUnarySummary(FT, cfretain);
else
S = getCFCreateGetRuleSummary(FD);
break;
}
if (cocoa::isRefType(RetTy, "DADisk") ||
cocoa::isRefType(RetTy, "DADissenter") ||
cocoa::isRefType(RetTy, "DASessionRef")) {
S = getCFCreateGetRuleSummary(FD);
break;
}
break;
}
if (FName[0] == 'C' && (FName[1] == 'F' || FName[1] == 'G')) {
FName = FName.substr(FName.startswith("CGCF") ? 4 : 2);
if (isRelease(FD, FName))
S = getUnarySummary(FT, cfrelease);
else {
assert (ScratchArgs.isEmpty());
ArgEffect E = (StrInStrNoCase(FName, "InsertValue") != StringRef::npos||
StrInStrNoCase(FName, "AddValue") != StringRef::npos ||
StrInStrNoCase(FName, "SetValue") != StringRef::npos ||
StrInStrNoCase(FName, "AppendValue") != StringRef::npos||
StrInStrNoCase(FName, "SetAttribute") != StringRef::npos)
? MayEscape : DoNothing;
S = getPersistentSummary(RetEffect::MakeNoRet(), DoNothing, E);
}
}
}
while (0);
if (!S)
S = getDefaultSummary();
if (AllowAnnotations)
updateSummaryFromAnnotations(S, FD);
FuncSummaries[FD] = S;
return S;
}
const RetainSummary *
RetainSummaryManager::getCFCreateGetRuleSummary(const FunctionDecl *FD) {
if (coreFoundation::followsCreateRule(FD))
return getCFSummaryCreateRule(FD);
return getCFSummaryGetRule(FD);
}
const RetainSummary *
RetainSummaryManager::getUnarySummary(const FunctionType* FT,
UnaryFuncKind func) {
const FunctionProtoType* FTP = dyn_cast<FunctionProtoType>(FT);
if (!FTP || FTP->getNumArgs() != 1)
return getPersistentStopSummary();
assert (ScratchArgs.isEmpty());
ArgEffect Effect;
switch (func) {
case cfretain: Effect = IncRef; break;
case cfrelease: Effect = DecRef; break;
case cfmakecollectable: Effect = MakeCollectable; break;
}
ScratchArgs = AF.add(ScratchArgs, 0, Effect);
return getPersistentSummary(RetEffect::MakeNoRet(), DoNothing, DoNothing);
}
const RetainSummary *
RetainSummaryManager::getCFSummaryCreateRule(const FunctionDecl *FD) {
assert (ScratchArgs.isEmpty());
return getPersistentSummary(RetEffect::MakeOwned(RetEffect::CF, true));
}
const RetainSummary *
RetainSummaryManager::getCFSummaryGetRule(const FunctionDecl *FD) {
assert (ScratchArgs.isEmpty());
return getPersistentSummary(RetEffect::MakeNotOwned(RetEffect::CF),
DoNothing, DoNothing);
}
void
RetainSummaryManager::updateSummaryFromAnnotations(const RetainSummary *&Summ,
const FunctionDecl *FD) {
if (!FD)
return;
assert(Summ && "Must have a summary to add annotations to.");
RetainSummaryTemplate Template(Summ, *this);
unsigned parm_idx = 0;
for (FunctionDecl::param_const_iterator pi = FD->param_begin(),
pe = FD->param_end(); pi != pe; ++pi, ++parm_idx) {
const ParmVarDecl *pd = *pi;
if (pd->getAttr<NSConsumedAttr>()) {
if (!GCEnabled) {
Template->addArg(AF, parm_idx, DecRef);
}
} else if (pd->getAttr<CFConsumedAttr>()) {
Template->addArg(AF, parm_idx, DecRef);
}
}
QualType RetTy = FD->getResultType();
if (cocoa::isCocoaObjectRef(RetTy)) {
if (FD->getAttr<NSReturnsRetainedAttr>()) {
Template->setRetEffect(ObjCAllocRetE);
}
else if (FD->getAttr<CFReturnsRetainedAttr>()) {
Template->setRetEffect(RetEffect::MakeOwned(RetEffect::CF, true));
}
else if (FD->getAttr<NSReturnsNotRetainedAttr>()) {
Template->setRetEffect(RetEffect::MakeNotOwned(RetEffect::ObjC));
}
else if (FD->getAttr<CFReturnsNotRetainedAttr>()) {
Template->setRetEffect(RetEffect::MakeNotOwned(RetEffect::CF));
}
} else if (RetTy->getAs<PointerType>()) {
if (FD->getAttr<CFReturnsRetainedAttr>()) {
Template->setRetEffect(RetEffect::MakeOwned(RetEffect::CF, true));
}
else if (FD->getAttr<CFReturnsNotRetainedAttr>()) {
Template->setRetEffect(RetEffect::MakeNotOwned(RetEffect::CF));
}
}
}
void
RetainSummaryManager::updateSummaryFromAnnotations(const RetainSummary *&Summ,
const ObjCMethodDecl *MD) {
if (!MD)
return;
assert(Summ && "Must have a valid summary to add annotations to");
RetainSummaryTemplate Template(Summ, *this);
bool isTrackedLoc = false;
if (MD->getAttr<NSConsumesSelfAttr>()) {
if (!GCEnabled)
Template->setReceiverEffect(DecRefMsg);
}
unsigned parm_idx = 0;
for (ObjCMethodDecl::param_const_iterator
pi=MD->param_begin(), pe=MD->param_end();
pi != pe; ++pi, ++parm_idx) {
const ParmVarDecl *pd = *pi;
if (pd->getAttr<NSConsumedAttr>()) {
if (!GCEnabled)
Template->addArg(AF, parm_idx, DecRef);
}
else if(pd->getAttr<CFConsumedAttr>()) {
Template->addArg(AF, parm_idx, DecRef);
}
}
if (cocoa::isCocoaObjectRef(MD->getResultType())) {
if (MD->getAttr<NSReturnsRetainedAttr>()) {
Template->setRetEffect(ObjCAllocRetE);
return;
}
if (MD->getAttr<NSReturnsNotRetainedAttr>()) {
Template->setRetEffect(RetEffect::MakeNotOwned(RetEffect::ObjC));
return;
}
isTrackedLoc = true;
} else {
isTrackedLoc = MD->getResultType()->getAs<PointerType>() != NULL;
}
if (isTrackedLoc) {
if (MD->getAttr<CFReturnsRetainedAttr>())
Template->setRetEffect(RetEffect::MakeOwned(RetEffect::CF, true));
else if (MD->getAttr<CFReturnsNotRetainedAttr>())
Template->setRetEffect(RetEffect::MakeNotOwned(RetEffect::CF));
}
}
const RetainSummary *
RetainSummaryManager::getStandardMethodSummary(const ObjCMethodDecl *MD,
Selector S, QualType RetTy) {
ArgEffect ReceiverEff = DoNothing;
RetEffect ResultEff = RetEffect::MakeNoRet();
switch (MD ? MD->getMethodFamily() : S.getMethodFamily()) {
case OMF_None:
case OMF_performSelector:
if (cocoa::isCocoaObjectRef(RetTy))
ResultEff = RetEffect::MakeNotOwned(RetEffect::ObjC);
else if (coreFoundation::isCFObjectRef(RetTy)) {
if (MD) {
switch (S.getMethodFamily()) {
case OMF_alloc:
case OMF_new:
case OMF_copy:
case OMF_mutableCopy:
ResultEff = RetEffect::MakeOwned(RetEffect::CF, true);
break;
default:
ResultEff = RetEffect::MakeNotOwned(RetEffect::CF);
break;
}
} else {
ResultEff = RetEffect::MakeNotOwned(RetEffect::CF);
}
}
break;
case OMF_init:
ResultEff = ObjCInitRetE;
ReceiverEff = DecRefMsg;
break;
case OMF_alloc:
case OMF_new:
case OMF_copy:
case OMF_mutableCopy:
if (cocoa::isCocoaObjectRef(RetTy))
ResultEff = ObjCAllocRetE;
else if (coreFoundation::isCFObjectRef(RetTy))
ResultEff = RetEffect::MakeOwned(RetEffect::CF, true);
break;
case OMF_autorelease:
ReceiverEff = Autorelease;
break;
case OMF_retain:
ReceiverEff = IncRefMsg;
break;
case OMF_release:
ReceiverEff = DecRefMsg;
break;
case OMF_dealloc:
ReceiverEff = Dealloc;
break;
case OMF_self:
break;
case OMF_retainCount:
case OMF_finalize:
break;
}
if (S.isKeywordSelector()) {
for (unsigned i = 0, e = S.getNumArgs(); i != e; ++i) {
StringRef Slot = S.getNameForSlot(i);
if (Slot.substr(Slot.size() - 8).equals_lower("delegate")) {
if (ResultEff == ObjCInitRetE)
ResultEff = RetEffect::MakeNoRetHard();
else
ReceiverEff = StopTrackingHard;
}
}
}
if (ScratchArgs.isEmpty() && ReceiverEff == DoNothing &&
ResultEff.getKind() == RetEffect::NoRet)
return getDefaultSummary();
return getPersistentSummary(ResultEff, ReceiverEff, MayEscape);
}
const RetainSummary *
RetainSummaryManager::getInstanceMethodSummary(const ObjCMethodCall &Msg,
ProgramStateRef State) {
const ObjCInterfaceDecl *ReceiverClass = 0;
SVal ReceiverV = Msg.getReceiverSVal();
if (SymbolRef Sym = ReceiverV.getAsLocSymbol())
if (const RefVal *T = getRefBinding(State, Sym))
if (const ObjCObjectPointerType *PT =
T->getType()->getAs<ObjCObjectPointerType>())
ReceiverClass = PT->getInterfaceDecl();
if (!ReceiverClass)
ReceiverClass = Msg.getReceiverInterface();
Selector S = Msg.getSelector();
const ObjCMethodDecl *Method = Msg.getDecl();
if (!Method && ReceiverClass)
Method = ReceiverClass->getInstanceMethod(S);
return getMethodSummary(S, ReceiverClass, Method, Msg.getResultType(),
ObjCMethodSummaries);
}
const RetainSummary *
RetainSummaryManager::getMethodSummary(Selector S, const ObjCInterfaceDecl *ID,
const ObjCMethodDecl *MD, QualType RetTy,
ObjCMethodSummariesTy &CachedSummaries) {
const RetainSummary *Summ = CachedSummaries.find(ID, S);
if (!Summ) {
Summ = getStandardMethodSummary(MD, S, RetTy);
updateSummaryFromAnnotations(Summ, MD);
CachedSummaries[ObjCSummaryKey(ID, S)] = Summ;
}
return Summ;
}
void RetainSummaryManager::InitializeClassMethodSummaries() {
assert(ScratchArgs.isEmpty());
addClassMethSummary("NSAssertionHandler", "currentHandler",
getPersistentSummary(RetEffect::MakeNotOwned(RetEffect::ObjC)));
ScratchArgs = AF.add(ScratchArgs, 0, Autorelease);
addClassMethSummary("NSAutoreleasePool", "addObject",
getPersistentSummary(RetEffect::MakeNoRet(),
DoNothing, Autorelease));
}
void RetainSummaryManager::InitializeMethodSummaries() {
assert (ScratchArgs.isEmpty());
const RetainSummary *InitSumm = getPersistentSummary(ObjCInitRetE, DecRefMsg);
addNSObjectMethSummary(GetNullarySelector("init", Ctx), InitSumm);
addNSObjectMethSummary(GetUnarySelector("awakeAfterUsingCoder", Ctx),
InitSumm);
const RetainSummary *AllocSumm = getPersistentSummary(ObjCAllocRetE);
const RetainSummary *CFAllocSumm =
getPersistentSummary(RetEffect::MakeOwned(RetEffect::CF, true));
RetEffect NoRet = RetEffect::MakeNoRet();
const RetainSummary *Summ = getPersistentSummary(NoRet, IncRefMsg);
addNSObjectMethSummary(GetNullarySelector("retain", Ctx), Summ);
Summ = getPersistentSummary(NoRet, DecRefMsg);
addNSObjectMethSummary(GetNullarySelector("release", Ctx), Summ);
Summ = getPersistentSummary(NoRet, isGCEnabled() ? DoNothing : DecRef);
addNSObjectMethSummary(GetNullarySelector("drain", Ctx), Summ);
Summ = getPersistentSummary(NoRet, Dealloc);
addNSObjectMethSummary(GetNullarySelector("dealloc", Ctx), Summ);
Summ = getPersistentSummary(NoRet, Autorelease);
addNSObjectMethSummary(GetNullarySelector("autorelease", Ctx), Summ);
addInstMethSummary("NSAutoreleasePool", "init",
getPersistentSummary(NoRet, NewAutoreleasePool));
const RetainSummary *NoTrackYet = getPersistentSummary(RetEffect::MakeNoRet(),
StopTracking,
StopTracking);
addClassMethSummary("NSWindow", "alloc", NoTrackYet);
addClassMethSummary("NSPanel", "alloc", NoTrackYet);
addClassMethSummary("NSAutoreleasePool", "alloc", NoTrackYet);
addClassMethSummary("NSAutoreleasePool", "allocWithZone", NoTrackYet, false);
addInstMethSummary("QCRenderer", AllocSumm,
"createSnapshotImageOfType", NULL);
addInstMethSummary("QCView", AllocSumm,
"createSnapshotImageOfType", NULL);
addInstMethSummary("CIContext", CFAllocSumm,
"createCGImage", "fromRect", NULL);
addInstMethSummary("CIContext", CFAllocSumm,
"createCGImage", "fromRect", "format", "colorSpace", NULL);
addInstMethSummary("CIContext", CFAllocSumm, "createCGLayerWithSize",
"info", NULL);
}
namespace {
typedef llvm::DenseMap<const ExplodedNode *, const RetainSummary *>
SummaryLogTy;
class CFRefBug : public BugType {
protected:
CFRefBug(StringRef name)
: BugType(name, categories::MemoryCoreFoundationObjectiveC) {}
public:
virtual const char *getDescription() const = 0;
virtual bool isLeak() const { return false; }
};
class UseAfterRelease : public CFRefBug {
public:
UseAfterRelease() : CFRefBug("Use-after-release") {}
const char *getDescription() const {
return "Reference-counted object is used after it is released";
}
};
class BadRelease : public CFRefBug {
public:
BadRelease() : CFRefBug("Bad release") {}
const char *getDescription() const {
return "Incorrect decrement of the reference count of an object that is "
"not owned at this point by the caller";
}
};
class DeallocGC : public CFRefBug {
public:
DeallocGC()
: CFRefBug("-dealloc called while using garbage collection") {}
const char *getDescription() const {
return "-dealloc called while using garbage collection";
}
};
class DeallocNotOwned : public CFRefBug {
public:
DeallocNotOwned()
: CFRefBug("-dealloc sent to non-exclusively owned object") {}
const char *getDescription() const {
return "-dealloc sent to object that may be referenced elsewhere";
}
};
class OverAutorelease : public CFRefBug {
public:
OverAutorelease()
: CFRefBug("Object sent -autorelease too many times") {}
const char *getDescription() const {
return "Object sent -autorelease too many times";
}
};
class ReturnedNotOwnedForOwned : public CFRefBug {
public:
ReturnedNotOwnedForOwned()
: CFRefBug("Method should return an owned object") {}
const char *getDescription() const {
return "Object with a +0 retain count returned to caller where a +1 "
"(owning) retain count is expected";
}
};
class Leak : public CFRefBug {
public:
Leak(StringRef name)
: CFRefBug(name) {
setSuppressOnSink(true);
}
const char *getDescription() const { return ""; }
bool isLeak() const { return true; }
};
class CFRefReportVisitor : public BugReporterVisitorImpl<CFRefReportVisitor> {
protected:
SymbolRef Sym;
const SummaryLogTy &SummaryLog;
bool GCEnabled;
public:
CFRefReportVisitor(SymbolRef sym, bool gcEnabled, const SummaryLogTy &log)
: Sym(sym), SummaryLog(log), GCEnabled(gcEnabled) {}
virtual void Profile(llvm::FoldingSetNodeID &ID) const {
static int x = 0;
ID.AddPointer(&x);
ID.AddPointer(Sym);
}
virtual PathDiagnosticPiece *VisitNode(const ExplodedNode *N,
const ExplodedNode *PrevN,
BugReporterContext &BRC,
BugReport &BR);
virtual PathDiagnosticPiece *getEndPath(BugReporterContext &BRC,
const ExplodedNode *N,
BugReport &BR);
};
class CFRefLeakReportVisitor : public CFRefReportVisitor {
public:
CFRefLeakReportVisitor(SymbolRef sym, bool GCEnabled,
const SummaryLogTy &log)
: CFRefReportVisitor(sym, GCEnabled, log) {}
PathDiagnosticPiece *getEndPath(BugReporterContext &BRC,
const ExplodedNode *N,
BugReport &BR);
virtual BugReporterVisitor *clone() const {
return new CFRefLeakReportVisitor(*this);
}
};
class CFRefReport : public BugReport {
void addGCModeDescription(const LangOptions &LOpts, bool GCEnabled);
public:
CFRefReport(CFRefBug &D, const LangOptions &LOpts, bool GCEnabled,
const SummaryLogTy &Log, ExplodedNode *n, SymbolRef sym,
bool registerVisitor = true)
: BugReport(D, D.getDescription(), n) {
if (registerVisitor)
addVisitor(new CFRefReportVisitor(sym, GCEnabled, Log));
addGCModeDescription(LOpts, GCEnabled);
}
CFRefReport(CFRefBug &D, const LangOptions &LOpts, bool GCEnabled,
const SummaryLogTy &Log, ExplodedNode *n, SymbolRef sym,
StringRef endText)
: BugReport(D, D.getDescription(), endText, n) {
addVisitor(new CFRefReportVisitor(sym, GCEnabled, Log));
addGCModeDescription(LOpts, GCEnabled);
}
virtual std::pair<ranges_iterator, ranges_iterator> getRanges() {
const CFRefBug& BugTy = static_cast<CFRefBug&>(getBugType());
if (!BugTy.isLeak())
return BugReport::getRanges();
else
return std::make_pair(ranges_iterator(), ranges_iterator());
}
};
class CFRefLeakReport : public CFRefReport {
const MemRegion* AllocBinding;
public:
CFRefLeakReport(CFRefBug &D, const LangOptions &LOpts, bool GCEnabled,
const SummaryLogTy &Log, ExplodedNode *n, SymbolRef sym,
CheckerContext &Ctx);
PathDiagnosticLocation getLocation(const SourceManager &SM) const {
assert(Location.isValid());
return Location;
}
};
}
void CFRefReport::addGCModeDescription(const LangOptions &LOpts,
bool GCEnabled) {
const char *GCModeDescription = 0;
switch (LOpts.getGC()) {
case LangOptions::GCOnly:
assert(GCEnabled);
GCModeDescription = "Code is compiled to only use garbage collection";
break;
case LangOptions::NonGC:
assert(!GCEnabled);
GCModeDescription = "Code is compiled to use reference counts";
break;
case LangOptions::HybridGC:
if (GCEnabled) {
GCModeDescription = "Code is compiled to use either garbage collection "
"(GC) or reference counts (non-GC). The bug occurs "
"with GC enabled";
break;
} else {
GCModeDescription = "Code is compiled to use either garbage collection "
"(GC) or reference counts (non-GC). The bug occurs "
"in non-GC mode";
break;
}
}
assert(GCModeDescription && "invalid/unknown GC mode");
addExtraText(GCModeDescription);
}
static inline bool contains(const SmallVectorImpl<ArgEffect>& V,
ArgEffect X) {
for (SmallVectorImpl<ArgEffect>::const_iterator I=V.begin(), E=V.end();
I!=E; ++I)
if (*I == X) return true;
return false;
}
static bool isNumericLiteralExpression(const Expr *E) {
return isa<IntegerLiteral>(E) ||
isa<CharacterLiteral>(E) ||
isa<FloatingLiteral>(E) ||
isa<ObjCBoolLiteralExpr>(E) ||
isa<CXXBoolLiteralExpr>(E);
}
PathDiagnosticPiece *CFRefReportVisitor::VisitNode(const ExplodedNode *N,
const ExplodedNode *PrevN,
BugReporterContext &BRC,
BugReport &BR) {
if (!isa<StmtPoint>(N->getLocation()))
return NULL;
ProgramStateRef PrevSt = PrevN->getState();
ProgramStateRef CurrSt = N->getState();
const LocationContext *LCtx = N->getLocationContext();
const RefVal* CurrT = getRefBinding(CurrSt, Sym);
if (!CurrT) return NULL;
const RefVal &CurrV = *CurrT;
const RefVal *PrevT = getRefBinding(PrevSt, Sym);
std::string sbuf;
llvm::raw_string_ostream os(sbuf);
if (!PrevT) {
const Stmt *S = cast<StmtPoint>(N->getLocation()).getStmt();
if (isa<ObjCArrayLiteral>(S)) {
os << "NSArray literal is an object with a +0 retain count";
}
else if (isa<ObjCDictionaryLiteral>(S)) {
os << "NSDictionary literal is an object with a +0 retain count";
}
else if (const ObjCBoxedExpr *BL = dyn_cast<ObjCBoxedExpr>(S)) {
if (isNumericLiteralExpression(BL->getSubExpr()))
os << "NSNumber literal is an object with a +0 retain count";
else {
const ObjCInterfaceDecl *BoxClass = 0;
if (const ObjCMethodDecl *Method = BL->getBoxingMethod())
BoxClass = Method->getClassInterface();
if (BoxClass)
os << *BoxClass << " b";
else
os << "B";
os << "oxed expression produces an object with a +0 retain count";
}
}
else {
if (const CallExpr *CE = dyn_cast<CallExpr>(S)) {
SVal X = CurrSt->getSValAsScalarOrLoc(CE->getCallee(), LCtx);
if (const FunctionDecl *FD = X.getAsFunctionDecl())
os << "Call to function '" << *FD << '\'';
else
os << "function call";
}
else {
assert(isa<ObjCMessageExpr>(S));
CallEventManager &Mgr = CurrSt->getStateManager().getCallEventManager();
CallEventRef<ObjCMethodCall> Call
= Mgr.getObjCMethodCall(cast<ObjCMessageExpr>(S), CurrSt, LCtx);
switch (Call->getMessageKind()) {
case OCM_Message:
os << "Method";
break;
case OCM_PropertyAccess:
os << "Property";
break;
case OCM_Subscript:
os << "Subscript";
break;
}
}
if (CurrV.getObjKind() == RetEffect::CF) {
os << " returns a Core Foundation object with a ";
}
else {
assert (CurrV.getObjKind() == RetEffect::ObjC);
os << " returns an Objective-C object with a ";
}
if (CurrV.isOwned()) {
os << "+1 retain count";
if (GCEnabled) {
assert(CurrV.getObjKind() == RetEffect::CF);
os << ". "
"Core Foundation objects are not automatically garbage collected.";
}
}
else {
assert (CurrV.isNotOwned());
os << "+0 retain count";
}
}
PathDiagnosticLocation Pos(S, BRC.getSourceManager(),
N->getLocationContext());
return new PathDiagnosticEventPiece(Pos, os.str());
}
SmallVector<ArgEffect, 2> AEffects;
const ExplodedNode *OrigNode = BRC.getNodeResolver().getOriginalNode(N);
if (const RetainSummary *Summ = SummaryLog.lookup(OrigNode)) {
const Stmt *S = cast<StmtPoint>(N->getLocation()).getStmt();
if (const CallExpr *CE = dyn_cast<CallExpr>(S)) {
unsigned i = 0;
for (CallExpr::const_arg_iterator AI=CE->arg_begin(), AE=CE->arg_end();
AI!=AE; ++AI, ++i) {
if (CurrSt->getSValAsScalarOrLoc(*AI, LCtx).getAsLocSymbol() != Sym)
continue;
AEffects.push_back(Summ->getArg(i));
}
}
else if (const ObjCMessageExpr *ME = dyn_cast<ObjCMessageExpr>(S)) {
if (const Expr *receiver = ME->getInstanceReceiver())
if (CurrSt->getSValAsScalarOrLoc(receiver, LCtx)
.getAsLocSymbol() == Sym) {
AEffects.push_back(Summ->getReceiverEffect());
}
}
}
do {
RefVal PrevV = *PrevT;
if (!GCEnabled && contains(AEffects, Dealloc)) {
assert(!(PrevV == CurrV) && "The typestate *must* have changed.");
if (CurrV.getKind() == RefVal::Released) {
assert(CurrV.getCombinedCounts() == 0);
os << "Object released by directly sending the '-dealloc' message";
break;
}
}
if (contains(AEffects, MakeCollectable)) {
const Stmt *S = cast<StmtPoint>(N->getLocation()).getStmt();
SVal X =
CurrSt->getSValAsScalarOrLoc(cast<CallExpr>(S)->getCallee(), LCtx);
const FunctionDecl *FD = X.getAsFunctionDecl();
if (GCEnabled) {
assert(!(PrevV == CurrV) && "The typestate *must* have changed.");
os << "In GC mode a call to '" << *FD
<< "' decrements an object's retain count and registers the "
"object with the garbage collector. ";
if (CurrV.getKind() == RefVal::Released) {
assert(CurrV.getCount() == 0);
os << "Since it now has a 0 retain count the object can be "
"automatically collected by the garbage collector.";
}
else
os << "An object must have a 0 retain count to be garbage collected. "
"After this call its retain count is +" << CurrV.getCount()
<< '.';
}
else
os << "When GC is not enabled a call to '" << *FD
<< "' has no effect on its argument.";
break;
}
if (!(PrevV == CurrV))
switch (CurrV.getKind()) {
case RefVal::Owned:
case RefVal::NotOwned:
if (PrevV.getCount() == CurrV.getCount()) {
if (PrevV.getAutoreleaseCount() == CurrV.getAutoreleaseCount())
return 0;
assert(PrevV.getAutoreleaseCount() < CurrV.getAutoreleaseCount());
os << "Object sent -autorelease message";
break;
}
if (PrevV.getCount() > CurrV.getCount())
os << "Reference count decremented.";
else
os << "Reference count incremented.";
if (unsigned Count = CurrV.getCount())
os << " The object now has a +" << Count << " retain count.";
if (PrevV.getKind() == RefVal::Released) {
assert(GCEnabled && CurrV.getCount() > 0);
os << " The object is not eligible for garbage collection until "
"the retain count reaches 0 again.";
}
break;
case RefVal::Released:
os << "Object released.";
break;
case RefVal::ReturnedOwned:
if (CurrV.getAutoreleaseCount())
return NULL;
os << "Object returned to caller as an owning reference (single "
"retain count transferred to caller)";
break;
case RefVal::ReturnedNotOwned:
os << "Object returned to caller with a +0 retain count";
break;
default:
return NULL;
}
for (SmallVectorImpl<ArgEffect>::iterator I=AEffects.begin(),
E=AEffects.end(); I != E; ++I) {
if (GCEnabled)
switch (*I) {
default: break;
case Autorelease:
os << "In GC mode an 'autorelease' has no effect.";
continue;
case IncRefMsg:
os << "In GC mode the 'retain' message has no effect.";
continue;
case DecRefMsg:
os << "In GC mode the 'release' message has no effect.";
continue;
}
}
} while (0);
if (os.str().empty())
return 0;
const Stmt *S = cast<StmtPoint>(N->getLocation()).getStmt();
PathDiagnosticLocation Pos(S, BRC.getSourceManager(),
N->getLocationContext());
PathDiagnosticPiece *P = new PathDiagnosticEventPiece(Pos, os.str());
for (Stmt::const_child_iterator I = S->child_begin(), E = S->child_end();
I!=E; ++I)
if (const Expr *Exp = dyn_cast_or_null<Expr>(*I))
if (CurrSt->getSValAsScalarOrLoc(Exp, LCtx).getAsLocSymbol() == Sym) {
P->addRange(Exp->getSourceRange());
break;
}
return P;
}
static std::pair<const ExplodedNode*,const MemRegion*>
GetAllocationSite(ProgramStateManager& StateMgr, const ExplodedNode *N,
SymbolRef Sym) {
const ExplodedNode *Last = N;
const MemRegion* FirstBinding = 0;
const LocationContext *LeakContext = N->getLocationContext();
while (N) {
ProgramStateRef St = N->getState();
if (!getRefBinding(St, Sym))
break;
StoreManager::FindUniqueBinding FB(Sym);
StateMgr.iterBindings(St, FB);
if (FB) FirstBinding = FB.getRegion();
if (N->getLocationContext() == LeakContext)
Last = N;
N = N->pred_empty() ? NULL : *(N->pred_begin());
}
if (N->getLocationContext() != LeakContext) {
FirstBinding = 0;
}
return std::make_pair(Last, FirstBinding);
}
PathDiagnosticPiece*
CFRefReportVisitor::getEndPath(BugReporterContext &BRC,
const ExplodedNode *EndN,
BugReport &BR) {
BR.markInteresting(Sym);
return BugReporterVisitor::getDefaultEndPath(BRC, EndN, BR);
}
PathDiagnosticPiece*
CFRefLeakReportVisitor::getEndPath(BugReporterContext &BRC,
const ExplodedNode *EndN,
BugReport &BR) {
BR.markInteresting(Sym);
const ExplodedNode *AllocNode = 0;
const MemRegion* FirstBinding = 0;
llvm::tie(AllocNode, FirstBinding) =
GetAllocationSite(BRC.getStateManager(), EndN, Sym);
SourceManager& SM = BRC.getSourceManager();
const ExplodedNode *LeakN = EndN;
PathDiagnosticLocation L = PathDiagnosticLocation::createEndOfPath(LeakN, SM);
std::string sbuf;
llvm::raw_string_ostream os(sbuf);
os << "Object leaked: ";
if (FirstBinding) {
os << "object allocated and stored into '"
<< FirstBinding->getString() << '\'';
}
else
os << "allocated object";
const RefVal* RV = getRefBinding(EndN->getState(), Sym);
if (RV->getKind() == RefVal::ErrorLeakReturned) {
const Decl *D = &EndN->getCodeDecl();
os << (isa<ObjCMethodDecl>(D) ? " is returned from a method "
: " is returned from a function ");
if (D->getAttr<CFReturnsNotRetainedAttr>())
os << "that is annotated as CF_RETURNS_NOT_RETAINED";
else if (D->getAttr<NSReturnsNotRetainedAttr>())
os << "that is annotated as NS_RETURNS_NOT_RETAINED";
else {
if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) {
os << "whose name ('" << MD->getSelector().getAsString()
<< "') does not start with 'copy', 'mutableCopy', 'alloc' or 'new'."
" This violates the naming convention rules"
" given in the Memory Management Guide for Cocoa";
}
else {
const FunctionDecl *FD = cast<FunctionDecl>(D);
os << "whose name ('" << *FD
<< "') does not contain 'Copy' or 'Create'. This violates the naming"
" convention rules given in the Memory Management Guide for Core"
" Foundation";
}
}
}
else if (RV->getKind() == RefVal::ErrorGCLeakReturned) {
ObjCMethodDecl &MD = cast<ObjCMethodDecl>(EndN->getCodeDecl());
os << " and returned from method '" << MD.getSelector().getAsString()
<< "' is potentially leaked when using garbage collection. Callers "
"of this method do not expect a returned object with a +1 retain "
"count since they expect the object to be managed by the garbage "
"collector";
}
else
os << " is not referenced later in this execution path and has a retain "
"count of +" << RV->getCount();
return new PathDiagnosticEventPiece(L, os.str());
}
CFRefLeakReport::CFRefLeakReport(CFRefBug &D, const LangOptions &LOpts,
bool GCEnabled, const SummaryLogTy &Log,
ExplodedNode *n, SymbolRef sym,
CheckerContext &Ctx)
: CFRefReport(D, LOpts, GCEnabled, Log, n, sym, false) {
const ExplodedNode *AllocNode = 0;
const SourceManager& SMgr = Ctx.getSourceManager();
llvm::tie(AllocNode, AllocBinding) = GetAllocationSite(Ctx.getStateManager(), getErrorNode(), sym);
const Stmt *AllocStmt;
ProgramPoint P = AllocNode->getLocation();
if (CallExitEnd *Exit = dyn_cast<CallExitEnd>(&P))
AllocStmt = Exit->getCalleeContext()->getCallSite();
else
AllocStmt = cast<PostStmt>(P).getStmt();
assert(AllocStmt && "All allocations must come from explicit calls");
Location = PathDiagnosticLocation::createBegin(AllocStmt, SMgr,
n->getLocationContext());
Description.clear();
llvm::raw_string_ostream os(Description);
os << "Potential leak ";
if (GCEnabled)
os << "(when using garbage collection) ";
os << "of an object";
if (AllocBinding)
os << " stored into '" << AllocBinding->getString() << '\'';
addVisitor(new CFRefLeakReportVisitor(sym, GCEnabled, Log));
}
namespace {
class RetainCountChecker
: public Checker< check::Bind,
check::DeadSymbols,
check::EndAnalysis,
check::EndPath,
check::PostStmt<BlockExpr>,
check::PostStmt<CastExpr>,
check::PostStmt<ObjCArrayLiteral>,
check::PostStmt<ObjCDictionaryLiteral>,
check::PostStmt<ObjCBoxedExpr>,
check::PostCall,
check::PreStmt<ReturnStmt>,
check::RegionChanges,
eval::Assume,
eval::Call > {
mutable OwningPtr<CFRefBug> useAfterRelease, releaseNotOwned;
mutable OwningPtr<CFRefBug> deallocGC, deallocNotOwned;
mutable OwningPtr<CFRefBug> overAutorelease, returnNotOwnedForOwned;
mutable OwningPtr<CFRefBug> leakWithinFunction, leakAtReturn;
mutable OwningPtr<CFRefBug> leakWithinFunctionGC, leakAtReturnGC;
typedef llvm::DenseMap<SymbolRef, const SimpleProgramPointTag *> SymbolTagMap;
mutable SymbolTagMap DeadSymbolTags;
mutable OwningPtr<RetainSummaryManager> Summaries;
mutable OwningPtr<RetainSummaryManager> SummariesGC;
mutable SummaryLogTy SummaryLog;
mutable bool ShouldResetSummaryLog;
public:
RetainCountChecker() : ShouldResetSummaryLog(false) {}
virtual ~RetainCountChecker() {
DeleteContainerSeconds(DeadSymbolTags);
}
void checkEndAnalysis(ExplodedGraph &G, BugReporter &BR,
ExprEngine &Eng) const {
if (ShouldResetSummaryLog)
SummaryLog.clear();
ShouldResetSummaryLog = !SummaryLog.empty();
}
CFRefBug *getLeakWithinFunctionBug(const LangOptions &LOpts,
bool GCEnabled) const {
if (GCEnabled) {
if (!leakWithinFunctionGC)
leakWithinFunctionGC.reset(new Leak("Leak of object when using "
"garbage collection"));
return leakWithinFunctionGC.get();
} else {
if (!leakWithinFunction) {
if (LOpts.getGC() == LangOptions::HybridGC) {
leakWithinFunction.reset(new Leak("Leak of object when not using "
"garbage collection (GC) in "
"dual GC/non-GC code"));
} else {
leakWithinFunction.reset(new Leak("Leak"));
}
}
return leakWithinFunction.get();
}
}
CFRefBug *getLeakAtReturnBug(const LangOptions &LOpts, bool GCEnabled) const {
if (GCEnabled) {
if (!leakAtReturnGC)
leakAtReturnGC.reset(new Leak("Leak of returned object when using "
"garbage collection"));
return leakAtReturnGC.get();
} else {
if (!leakAtReturn) {
if (LOpts.getGC() == LangOptions::HybridGC) {
leakAtReturn.reset(new Leak("Leak of returned object when not using "
"garbage collection (GC) in dual "
"GC/non-GC code"));
} else {
leakAtReturn.reset(new Leak("Leak of returned object"));
}
}
return leakAtReturn.get();
}
}
RetainSummaryManager &getSummaryManager(ASTContext &Ctx,
bool GCEnabled) const {
bool ARCEnabled = (bool)Ctx.getLangOpts().ObjCAutoRefCount;
if (GCEnabled) {
if (!SummariesGC)
SummariesGC.reset(new RetainSummaryManager(Ctx, true, ARCEnabled));
else
assert(SummariesGC->isARCEnabled() == ARCEnabled);
return *SummariesGC;
} else {
if (!Summaries)
Summaries.reset(new RetainSummaryManager(Ctx, false, ARCEnabled));
else
assert(Summaries->isARCEnabled() == ARCEnabled);
return *Summaries;
}
}
RetainSummaryManager &getSummaryManager(CheckerContext &C) const {
return getSummaryManager(C.getASTContext(), C.isObjCGCEnabled());
}
void printState(raw_ostream &Out, ProgramStateRef State,
const char *NL, const char *Sep) const;
void checkBind(SVal loc, SVal val, const Stmt *S, CheckerContext &C) const;
void checkPostStmt(const BlockExpr *BE, CheckerContext &C) const;
void checkPostStmt(const CastExpr *CE, CheckerContext &C) const;
void checkPostStmt(const ObjCArrayLiteral *AL, CheckerContext &C) const;
void checkPostStmt(const ObjCDictionaryLiteral *DL, CheckerContext &C) const;
void checkPostStmt(const ObjCBoxedExpr *BE, CheckerContext &C) const;
void checkPostCall(const CallEvent &Call, CheckerContext &C) const;
void checkSummary(const RetainSummary &Summ, const CallEvent &Call,
CheckerContext &C) const;
void processSummaryOfInlined(const RetainSummary &Summ,
const CallEvent &Call,
CheckerContext &C) const;
bool evalCall(const CallExpr *CE, CheckerContext &C) const;
ProgramStateRef evalAssume(ProgramStateRef state, SVal Cond,
bool Assumption) const;
ProgramStateRef
checkRegionChanges(ProgramStateRef state,
const StoreManager::InvalidatedSymbols *invalidated,
ArrayRef<const MemRegion *> ExplicitRegions,
ArrayRef<const MemRegion *> Regions,
const CallEvent *Call) const;
bool wantsRegionChangeUpdate(ProgramStateRef state) const {
return true;
}
void checkPreStmt(const ReturnStmt *S, CheckerContext &C) const;
void checkReturnWithRetEffect(const ReturnStmt *S, CheckerContext &C,
ExplodedNode *Pred, RetEffect RE, RefVal X,
SymbolRef Sym, ProgramStateRef state) const;
void checkDeadSymbols(SymbolReaper &SymReaper, CheckerContext &C) const;
void checkEndPath(CheckerContext &C) const;
ProgramStateRef updateSymbol(ProgramStateRef state, SymbolRef sym,
RefVal V, ArgEffect E, RefVal::Kind &hasErr,
CheckerContext &C) const;
void processNonLeakError(ProgramStateRef St, SourceRange ErrorRange,
RefVal::Kind ErrorKind, SymbolRef Sym,
CheckerContext &C) const;
void processObjCLiterals(CheckerContext &C, const Expr *Ex) const;
const ProgramPointTag *getDeadSymbolTag(SymbolRef sym) const;
ProgramStateRef handleSymbolDeath(ProgramStateRef state,
SymbolRef sid, RefVal V,
SmallVectorImpl<SymbolRef> &Leaked) const;
std::pair<ExplodedNode *, ProgramStateRef >
handleAutoreleaseCounts(ProgramStateRef state, ExplodedNode *Pred,
const ProgramPointTag *Tag, CheckerContext &Ctx,
SymbolRef Sym, RefVal V) const;
ExplodedNode *processLeaks(ProgramStateRef state,
SmallVectorImpl<SymbolRef> &Leaked,
CheckerContext &Ctx,
ExplodedNode *Pred = 0) const;
};
}
namespace {
class StopTrackingCallback : public SymbolVisitor {
ProgramStateRef state;
public:
StopTrackingCallback(ProgramStateRef st) : state(st) {}
ProgramStateRef getState() const { return state; }
bool VisitSymbol(SymbolRef sym) {
state = state->remove<RefBindings>(sym);
return true;
}
};
}
void RetainCountChecker::checkPostStmt(const BlockExpr *BE,
CheckerContext &C) const {
if (!BE->getBlockDecl()->hasCaptures())
return;
ProgramStateRef state = C.getState();
const BlockDataRegion *R =
cast<BlockDataRegion>(state->getSVal(BE,
C.getLocationContext()).getAsRegion());
BlockDataRegion::referenced_vars_iterator I = R->referenced_vars_begin(),
E = R->referenced_vars_end();
if (I == E)
return;
SmallVector<const MemRegion*, 10> Regions;
const LocationContext *LC = C.getLocationContext();
MemRegionManager &MemMgr = C.getSValBuilder().getRegionManager();
for ( ; I != E; ++I) {
const VarRegion *VR = *I;
if (VR->getSuperRegion() == R) {
VR = MemMgr.getVarRegion(VR->getDecl(), LC);
}
Regions.push_back(VR);
}
state =
state->scanReachableSymbols<StopTrackingCallback>(Regions.data(),
Regions.data() + Regions.size()).getState();
C.addTransition(state);
}
void RetainCountChecker::checkPostStmt(const CastExpr *CE,
CheckerContext &C) const {
const ObjCBridgedCastExpr *BE = dyn_cast<ObjCBridgedCastExpr>(CE);
if (!BE)
return;
ArgEffect AE = IncRef;
switch (BE->getBridgeKind()) {
case clang::OBC_Bridge:
return;
case clang::OBC_BridgeRetained:
AE = IncRef;
break;
case clang::OBC_BridgeTransfer:
AE = DecRefBridgedTransfered;
break;
}
ProgramStateRef state = C.getState();
SymbolRef Sym = state->getSVal(CE, C.getLocationContext()).getAsLocSymbol();
if (!Sym)
return;
const RefVal* T = getRefBinding(state, Sym);
if (!T)
return;
RefVal::Kind hasErr = (RefVal::Kind) 0;
state = updateSymbol(state, Sym, *T, AE, hasErr, C);
if (hasErr) {
return;
}
C.addTransition(state);
}
void RetainCountChecker::processObjCLiterals(CheckerContext &C,
const Expr *Ex) const {
ProgramStateRef state = C.getState();
const ExplodedNode *pred = C.getPredecessor();
for (Stmt::const_child_iterator it = Ex->child_begin(), et = Ex->child_end() ;
it != et ; ++it) {
const Stmt *child = *it;
SVal V = state->getSVal(child, pred->getLocationContext());
if (SymbolRef sym = V.getAsSymbol())
if (const RefVal* T = getRefBinding(state, sym)) {
RefVal::Kind hasErr = (RefVal::Kind) 0;
state = updateSymbol(state, sym, *T, MayEscape, hasErr, C);
if (hasErr) {
processNonLeakError(state, child->getSourceRange(), hasErr, sym, C);
return;
}
}
}
if (SymbolRef sym =
state->getSVal(Ex, pred->getLocationContext()).getAsSymbol()) {
QualType ResultTy = Ex->getType();
state = setRefBinding(state, sym,
RefVal::makeNotOwned(RetEffect::ObjC, ResultTy));
}
C.addTransition(state);
}
void RetainCountChecker::checkPostStmt(const ObjCArrayLiteral *AL,
CheckerContext &C) const {
processObjCLiterals(C, AL);
}
void RetainCountChecker::checkPostStmt(const ObjCDictionaryLiteral *DL,
CheckerContext &C) const {
processObjCLiterals(C, DL);
}
void RetainCountChecker::checkPostStmt(const ObjCBoxedExpr *Ex,
CheckerContext &C) const {
const ExplodedNode *Pred = C.getPredecessor();
const LocationContext *LCtx = Pred->getLocationContext();
ProgramStateRef State = Pred->getState();
if (SymbolRef Sym = State->getSVal(Ex, LCtx).getAsSymbol()) {
QualType ResultTy = Ex->getType();
State = setRefBinding(State, Sym,
RefVal::makeNotOwned(RetEffect::ObjC, ResultTy));
}
C.addTransition(State);
}
void RetainCountChecker::checkPostCall(const CallEvent &Call,
CheckerContext &C) const {
RetainSummaryManager &Summaries = getSummaryManager(C);
const RetainSummary *Summ = Summaries.getSummary(Call, C.getState());
if (C.wasInlined) {
processSummaryOfInlined(*Summ, Call, C);
return;
}
checkSummary(*Summ, Call, C);
}
static QualType GetReturnType(const Expr *RetE, ASTContext &Ctx) {
QualType RetTy = RetE->getType();
if (const ObjCMessageExpr *ME = dyn_cast<ObjCMessageExpr>(RetE))
if (const ObjCObjectPointerType *PT = RetTy->getAs<ObjCObjectPointerType>())
if (PT->isObjCQualifiedIdType() || PT->isObjCIdType() ||
PT->isObjCClassType()) {
const ObjCInterfaceDecl *D = ME->getReceiverInterface();
return !D ? RetTy :
Ctx.getObjCObjectPointerType(Ctx.getObjCInterfaceType(D));
}
return RetTy;
}
void RetainCountChecker::processSummaryOfInlined(const RetainSummary &Summ,
const CallEvent &CallOrMsg,
CheckerContext &C) const {
ProgramStateRef state = C.getState();
for (unsigned idx = 0, e = CallOrMsg.getNumArgs(); idx != e; ++idx) {
if (Summ.getArg(idx) == StopTrackingHard) {
SVal V = CallOrMsg.getArgSVal(idx);
if (SymbolRef Sym = V.getAsLocSymbol()) {
state = removeRefBinding(state, Sym);
}
}
}
const ObjCMethodCall *MsgInvocation = dyn_cast<ObjCMethodCall>(&CallOrMsg);
if (MsgInvocation) {
if (SymbolRef Sym = MsgInvocation->getReceiverSVal().getAsLocSymbol()) {
if (Summ.getReceiverEffect() == StopTrackingHard) {
state = removeRefBinding(state, Sym);
}
}
}
RetEffect RE = Summ.getRetEffect();
if (RE.getKind() == RetEffect::NoRetHard) {
SymbolRef Sym = state->getSVal(CallOrMsg.getOriginExpr(),
C.getLocationContext()).getAsSymbol();
if (Sym)
state = removeRefBinding(state, Sym);
}
C.addTransition(state);
}
void RetainCountChecker::checkSummary(const RetainSummary &Summ,
const CallEvent &CallOrMsg,
CheckerContext &C) const {
ProgramStateRef state = C.getState();
RefVal::Kind hasErr = (RefVal::Kind) 0;
SourceRange ErrorRange;
SymbolRef ErrorSym = 0;
for (unsigned idx = 0, e = CallOrMsg.getNumArgs(); idx != e; ++idx) {
SVal V = CallOrMsg.getArgSVal(idx);
if (SymbolRef Sym = V.getAsLocSymbol()) {
if (const RefVal *T = getRefBinding(state, Sym)) {
state = updateSymbol(state, Sym, *T, Summ.getArg(idx), hasErr, C);
if (hasErr) {
ErrorRange = CallOrMsg.getArgSourceRange(idx);
ErrorSym = Sym;
break;
}
}
}
}
bool ReceiverIsTracked = false;
if (!hasErr) {
const ObjCMethodCall *MsgInvocation = dyn_cast<ObjCMethodCall>(&CallOrMsg);
if (MsgInvocation) {
if (SymbolRef Sym = MsgInvocation->getReceiverSVal().getAsLocSymbol()) {
if (const RefVal *T = getRefBinding(state, Sym)) {
ReceiverIsTracked = true;
state = updateSymbol(state, Sym, *T, Summ.getReceiverEffect(),
hasErr, C);
if (hasErr) {
ErrorRange = MsgInvocation->getOriginExpr()->getReceiverRange();
ErrorSym = Sym;
}
}
}
}
}
if (hasErr) {
processNonLeakError(state, ErrorRange, hasErr, ErrorSym, C);
return;
}
RetEffect RE = Summ.getRetEffect();
if (RE.getKind() == RetEffect::OwnedWhenTrackedReceiver) {
if (ReceiverIsTracked)
RE = getSummaryManager(C).getObjAllocRetEffect();
else
RE = RetEffect::MakeNoRet();
}
switch (RE.getKind()) {
default:
llvm_unreachable("Unhandled RetEffect.");
case RetEffect::NoRet:
case RetEffect::NoRetHard:
break;
case RetEffect::OwnedAllocatedSymbol:
case RetEffect::OwnedSymbol: {
SymbolRef Sym = state->getSVal(CallOrMsg.getOriginExpr(),
C.getLocationContext()).getAsSymbol();
if (!Sym)
break;
QualType ResultTy = CallOrMsg.getResultType();
state = setRefBinding(state, Sym, RefVal::makeOwned(RE.getObjKind(),
ResultTy));
break;
}
case RetEffect::GCNotOwnedSymbol:
case RetEffect::ARCNotOwnedSymbol:
case RetEffect::NotOwnedSymbol: {
const Expr *Ex = CallOrMsg.getOriginExpr();
SymbolRef Sym = state->getSVal(Ex, C.getLocationContext()).getAsSymbol();
if (!Sym)
break;
QualType ResultTy = GetReturnType(Ex, C.getASTContext());
state = setRefBinding(state, Sym, RefVal::makeNotOwned(RE.getObjKind(),
ResultTy));
break;
}
}
ExplodedNode *NewNode;
if (state == C.getState()) {
NewNode = C.getPredecessor();
} else {
NewNode = C.addTransition(state);
}
if (NewNode) {
if (ShouldResetSummaryLog) {
SummaryLog.clear();
ShouldResetSummaryLog = false;
}
SummaryLog[NewNode] = &Summ;
}
}
ProgramStateRef
RetainCountChecker::updateSymbol(ProgramStateRef state, SymbolRef sym,
RefVal V, ArgEffect E, RefVal::Kind &hasErr,
CheckerContext &C) const {
bool IgnoreRetainMsg = C.isObjCGCEnabled();
if (!IgnoreRetainMsg)
IgnoreRetainMsg = (bool)C.getASTContext().getLangOpts().ObjCAutoRefCount;
switch (E) {
default:
break;
case IncRefMsg:
E = IgnoreRetainMsg ? DoNothing : IncRef;
break;
case DecRefMsg:
E = IgnoreRetainMsg ? DoNothing : DecRef;
break;
case DecRefMsgAndStopTrackingHard:
E = IgnoreRetainMsg ? StopTracking : DecRefAndStopTrackingHard;
break;
case MakeCollectable:
E = C.isObjCGCEnabled() ? DecRef : DoNothing;
break;
case NewAutoreleasePool:
E = C.isObjCGCEnabled() ? DoNothing : NewAutoreleasePool;
break;
}
if (!C.isObjCGCEnabled() && V.getKind() == RefVal::Released) {
V = V ^ RefVal::ErrorUseAfterRelease;
hasErr = V.getKind();
return setRefBinding(state, sym, V);
}
switch (E) {
case DecRefMsg:
case IncRefMsg:
case MakeCollectable:
case DecRefMsgAndStopTrackingHard:
llvm_unreachable("DecRefMsg/IncRefMsg/MakeCollectable already converted");
case Dealloc:
if (C.isObjCGCEnabled()) {
V = V ^ RefVal::ErrorDeallocGC;
hasErr = V.getKind();
break;
}
switch (V.getKind()) {
default:
llvm_unreachable("Invalid RefVal state for an explicit dealloc.");
case RefVal::Owned:
V = V ^ RefVal::Released;
V.clearCounts();
return setRefBinding(state, sym, V);
case RefVal::NotOwned:
V = V ^ RefVal::ErrorDeallocNotOwned;
hasErr = V.getKind();
break;
}
break;
case NewAutoreleasePool:
assert(!C.isObjCGCEnabled());
return state;
case MayEscape:
if (V.getKind() == RefVal::Owned) {
V = V ^ RefVal::NotOwned;
break;
}
case DoNothing:
return state;
case Autorelease:
if (C.isObjCGCEnabled())
return state;
V = V.autorelease();
break;
case StopTracking:
case StopTrackingHard:
return removeRefBinding(state, sym);
case IncRef:
switch (V.getKind()) {
default:
llvm_unreachable("Invalid RefVal state for a retain.");
case RefVal::Owned:
case RefVal::NotOwned:
V = V + 1;
break;
case RefVal::Released:
assert(C.isObjCGCEnabled());
V = (V ^ RefVal::Owned) + 1;
break;
}
break;
case DecRef:
case DecRefBridgedTransfered:
case DecRefAndStopTrackingHard:
switch (V.getKind()) {
default:
llvm_unreachable("Invalid RefVal state for a release.");
case RefVal::Owned:
assert(V.getCount() > 0);
if (V.getCount() == 1)
V = V ^ (E == DecRefBridgedTransfered ?
RefVal::NotOwned : RefVal::Released);
else if (E == DecRefAndStopTrackingHard)
return removeRefBinding(state, sym);
V = V - 1;
break;
case RefVal::NotOwned:
if (V.getCount() > 0) {
if (E == DecRefAndStopTrackingHard)
return removeRefBinding(state, sym);
V = V - 1;
} else {
V = V ^ RefVal::ErrorReleaseNotOwned;
hasErr = V.getKind();
}
break;
case RefVal::Released:
assert(C.isObjCGCEnabled());
V = V ^ RefVal::ErrorUseAfterRelease;
hasErr = V.getKind();
break;
}
break;
}
return setRefBinding(state, sym, V);
}
void RetainCountChecker::processNonLeakError(ProgramStateRef St,
SourceRange ErrorRange,
RefVal::Kind ErrorKind,
SymbolRef Sym,
CheckerContext &C) const {
ExplodedNode *N = C.generateSink(St);
if (!N)
return;
CFRefBug *BT;
switch (ErrorKind) {
default:
llvm_unreachable("Unhandled error.");
case RefVal::ErrorUseAfterRelease:
if (!useAfterRelease)
useAfterRelease.reset(new UseAfterRelease());
BT = &*useAfterRelease;
break;
case RefVal::ErrorReleaseNotOwned:
if (!releaseNotOwned)
releaseNotOwned.reset(new BadRelease());
BT = &*releaseNotOwned;
break;
case RefVal::ErrorDeallocGC:
if (!deallocGC)
deallocGC.reset(new DeallocGC());
BT = &*deallocGC;
break;
case RefVal::ErrorDeallocNotOwned:
if (!deallocNotOwned)
deallocNotOwned.reset(new DeallocNotOwned());
BT = &*deallocNotOwned;
break;
}
assert(BT);
CFRefReport *report = new CFRefReport(*BT, C.getASTContext().getLangOpts(),
C.isObjCGCEnabled(), SummaryLog,
N, Sym);
report->addRange(ErrorRange);
C.EmitReport(report);
}
bool RetainCountChecker::evalCall(const CallExpr *CE, CheckerContext &C) const {
ProgramStateRef state = C.getState();
const FunctionDecl *FD = C.getCalleeDecl(CE);
if (!FD)
return false;
IdentifierInfo *II = FD->getIdentifier();
if (!II)
return false;
if (CE->getNumArgs() != 1)
return false;
StringRef FName = II->getName();
FName = FName.substr(FName.find_first_not_of('_'));
bool canEval = false;
QualType ResultTy = CE->getCallReturnType();
if (ResultTy->isObjCIdType()) {
canEval = II->isStr("NSMakeCollectable");
} else if (ResultTy->isPointerType()) {
if (cocoa::isRefType(ResultTy, "CF", FName) ||
cocoa::isRefType(ResultTy, "CG", FName)) {
canEval = isRetain(FD, FName) || isMakeCollectable(FD, FName);
}
}
if (!canEval)
return false;
const LocationContext *LCtx = C.getLocationContext();
SVal RetVal = state->getSVal(CE->getArg(0), LCtx);
if (RetVal.isUnknown()) {
SValBuilder &SVB = C.getSValBuilder();
RetVal = SVB.conjureSymbolVal(0, CE, LCtx, ResultTy, C.blockCount());
}
state = state->BindExpr(CE, LCtx, RetVal, false);
if (const MemRegion *ArgRegion = RetVal.getAsRegion()) {
SymbolRef Sym = RetVal.getAsLocSymbol();
const RefVal *Binding = 0;
if (Sym)
Binding = getRefBinding(state, Sym);
state = state->invalidateRegions(ArgRegion, CE, C.blockCount(), LCtx);
if (Binding)
state = setRefBinding(state, Sym, *Binding);
}
C.addTransition(state);
return true;
}
static bool inTopFrame(CheckerContext &C) {
const LocationContext *LC = C.getLocationContext();
return LC->getParent() == 0;
}
void RetainCountChecker::checkPreStmt(const ReturnStmt *S,
CheckerContext &C) const {
if (!inTopFrame(C))
return;
const Expr *RetE = S->getRetValue();
if (!RetE)
return;
ProgramStateRef state = C.getState();
SymbolRef Sym =
state->getSValAsScalarOrLoc(RetE, C.getLocationContext()).getAsLocSymbol();
if (!Sym)
return;
const RefVal *T = getRefBinding(state, Sym);
if (!T)
return;
RefVal X = *T;
switch (X.getKind()) {
case RefVal::Owned: {
unsigned cnt = X.getCount();
assert(cnt > 0);
X.setCount(cnt - 1);
X = X ^ RefVal::ReturnedOwned;
break;
}
case RefVal::NotOwned: {
unsigned cnt = X.getCount();
if (cnt) {
X.setCount(cnt - 1);
X = X ^ RefVal::ReturnedOwned;
}
else {
X = X ^ RefVal::ReturnedNotOwned;
}
break;
}
default:
return;
}
state = setRefBinding(state, Sym, X);
ExplodedNode *Pred = C.addTransition(state);
if (!Pred)
return;
static SimpleProgramPointTag
AutoreleaseTag("RetainCountChecker : Autorelease");
llvm::tie(Pred, state) = handleAutoreleaseCounts(state, Pred, &AutoreleaseTag,
C, Sym, X);
if (!Pred)
return;
T = getRefBinding(state, Sym);
assert(T);
X = *T;
RetainSummaryManager &Summaries = getSummaryManager(C);
const Decl *CD = &Pred->getCodeDecl();
RetEffect RE = RetEffect::MakeNoRet();
if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CD)) {
const RetainSummary *Summ = Summaries.getMethodSummary(MD);
RE = Summ->getRetEffect();
} else if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(CD)) {
if (!isa<CXXMethodDecl>(FD)) {
const RetainSummary *Summ = Summaries.getFunctionSummary(FD);
RE = Summ->getRetEffect();
}
}
checkReturnWithRetEffect(S, C, Pred, RE, X, Sym, state);
}
void RetainCountChecker::checkReturnWithRetEffect(const ReturnStmt *S,
CheckerContext &C,
ExplodedNode *Pred,
RetEffect RE, RefVal X,
SymbolRef Sym,
ProgramStateRef state) const {
if (X.isReturnedOwned() && X.getCount() == 0) {
if (RE.getKind() != RetEffect::NoRet) {
bool hasError = false;
if (C.isObjCGCEnabled() && RE.getObjKind() == RetEffect::ObjC) {
hasError = true;
X = X ^ RefVal::ErrorGCLeakReturned;
}
else if (!RE.isOwned()) {
hasError = true;
X = X ^ RefVal::ErrorLeakReturned;
}
if (hasError) {
state = setRefBinding(state, Sym, X);
static SimpleProgramPointTag
ReturnOwnLeakTag("RetainCountChecker : ReturnsOwnLeak");
ExplodedNode *N = C.addTransition(state, Pred, &ReturnOwnLeakTag);
if (N) {
const LangOptions &LOpts = C.getASTContext().getLangOpts();
bool GCEnabled = C.isObjCGCEnabled();
CFRefReport *report =
new CFRefLeakReport(*getLeakAtReturnBug(LOpts, GCEnabled),
LOpts, GCEnabled, SummaryLog,
N, Sym, C);
C.EmitReport(report);
}
}
}
} else if (X.isReturnedNotOwned()) {
if (RE.isOwned()) {
state = setRefBinding(state, Sym, X ^ RefVal::ErrorReturnedNotOwned);
static SimpleProgramPointTag
ReturnNotOwnedTag("RetainCountChecker : ReturnNotOwnedForOwned");
ExplodedNode *N = C.addTransition(state, Pred, &ReturnNotOwnedTag);
if (N) {
if (!returnNotOwnedForOwned)
returnNotOwnedForOwned.reset(new ReturnedNotOwnedForOwned());
CFRefReport *report =
new CFRefReport(*returnNotOwnedForOwned,
C.getASTContext().getLangOpts(),
C.isObjCGCEnabled(), SummaryLog, N, Sym);
C.EmitReport(report);
}
}
}
}
void RetainCountChecker::checkBind(SVal loc, SVal val, const Stmt *S,
CheckerContext &C) const {
bool escapes = true;
ProgramStateRef state = C.getState();
if (loc::MemRegionVal *regionLoc = dyn_cast<loc::MemRegionVal>(&loc)) {
escapes = !regionLoc->getRegion()->hasStackStorage();
if (!escapes) {
SVal StoredVal = state->getSVal(regionLoc->getRegion());
if (StoredVal != val)
escapes = (state == (state->bindLoc(*regionLoc, val)));
}
if (!escapes) {
escapes = !isa<VarRegion>(regionLoc->getRegion());
}
}
if (!escapes)
return;
state = state->scanReachableSymbols<StopTrackingCallback>(val).getState();
C.addTransition(state);
}
ProgramStateRef RetainCountChecker::evalAssume(ProgramStateRef state,
SVal Cond,
bool Assumption) const {
RefBindings B = state->get<RefBindings>();
if (B.isEmpty())
return state;
bool changed = false;
RefBindings::Factory &RefBFactory = state->get_context<RefBindings>();
for (RefBindings::iterator I = B.begin(), E = B.end(); I != E; ++I) {
ConstraintManager &CMgr = state->getConstraintManager();
ConditionTruthVal AllocFailed = CMgr.isNull(state, I.getKey());
if (AllocFailed.isConstrainedTrue()) {
changed = true;
B = RefBFactory.remove(B, I.getKey());
}
}
if (changed)
state = state->set<RefBindings>(B);
return state;
}
ProgramStateRef
RetainCountChecker::checkRegionChanges(ProgramStateRef state,
const StoreManager::InvalidatedSymbols *invalidated,
ArrayRef<const MemRegion *> ExplicitRegions,
ArrayRef<const MemRegion *> Regions,
const CallEvent *Call) const {
if (!invalidated)
return state;
llvm::SmallPtrSet<SymbolRef, 8> WhitelistedSymbols;
for (ArrayRef<const MemRegion *>::iterator I = ExplicitRegions.begin(),
E = ExplicitRegions.end(); I != E; ++I) {
if (const SymbolicRegion *SR = (*I)->StripCasts()->getAs<SymbolicRegion>())
WhitelistedSymbols.insert(SR->getSymbol());
}
for (StoreManager::InvalidatedSymbols::const_iterator I=invalidated->begin(),
E = invalidated->end(); I!=E; ++I) {
SymbolRef sym = *I;
if (WhitelistedSymbols.count(sym))
continue;
state = removeRefBinding(state, sym);
}
return state;
}
std::pair<ExplodedNode *, ProgramStateRef >
RetainCountChecker::handleAutoreleaseCounts(ProgramStateRef state,
ExplodedNode *Pred,
const ProgramPointTag *Tag,
CheckerContext &Ctx,
SymbolRef Sym, RefVal V) const {
unsigned ACnt = V.getAutoreleaseCount();
if (!ACnt)
return std::make_pair(Pred, state);
assert(!Ctx.isObjCGCEnabled() && "Autorelease counts in GC mode?");
unsigned Cnt = V.getCount();
if (V.getKind() == RefVal::ReturnedOwned)
++Cnt;
if (ACnt <= Cnt) {
if (ACnt == Cnt) {
V.clearCounts();
if (V.getKind() == RefVal::ReturnedOwned)
V = V ^ RefVal::ReturnedNotOwned;
else
V = V ^ RefVal::NotOwned;
} else {
V.setCount(Cnt - ACnt);
V.setAutoreleaseCount(0);
}
state = setRefBinding(state, Sym, V);
ExplodedNode *N = Ctx.addTransition(state, Pred, Tag);
if (N == 0)
state = 0;
return std::make_pair(N, state);
}
V = V ^ RefVal::ErrorOverAutorelease;
state = setRefBinding(state, Sym, V);
ExplodedNode *N = Ctx.generateSink(state, Pred, Tag);
if (N) {
SmallString<128> sbuf;
llvm::raw_svector_ostream os(sbuf);
os << "Object over-autoreleased: object was sent -autorelease ";
if (V.getAutoreleaseCount() > 1)
os << V.getAutoreleaseCount() << " times ";
os << "but the object has a +" << V.getCount() << " retain count";
if (!overAutorelease)
overAutorelease.reset(new OverAutorelease());
const LangOptions &LOpts = Ctx.getASTContext().getLangOpts();
CFRefReport *report =
new CFRefReport(*overAutorelease, LOpts, false,
SummaryLog, N, Sym, os.str());
Ctx.EmitReport(report);
}
return std::make_pair((ExplodedNode *)0, (ProgramStateRef )0);
}
ProgramStateRef
RetainCountChecker::handleSymbolDeath(ProgramStateRef state,
SymbolRef sid, RefVal V,
SmallVectorImpl<SymbolRef> &Leaked) const {
bool hasLeak = false;
if (V.isOwned())
hasLeak = true;
else if (V.isNotOwned() || V.isReturnedOwned())
hasLeak = (V.getCount() > 0);
if (!hasLeak)
return removeRefBinding(state, sid);
Leaked.push_back(sid);
return setRefBinding(state, sid, V ^ RefVal::ErrorLeak);
}
ExplodedNode *
RetainCountChecker::processLeaks(ProgramStateRef state,
SmallVectorImpl<SymbolRef> &Leaked,
CheckerContext &Ctx,
ExplodedNode *Pred) const {
if (Leaked.empty())
return Pred;
ExplodedNode *N = Ctx.addTransition(state, Pred);
if (N) {
for (SmallVectorImpl<SymbolRef>::iterator
I = Leaked.begin(), E = Leaked.end(); I != E; ++I) {
const LangOptions &LOpts = Ctx.getASTContext().getLangOpts();
bool GCEnabled = Ctx.isObjCGCEnabled();
CFRefBug *BT = Pred ? getLeakWithinFunctionBug(LOpts, GCEnabled)
: getLeakAtReturnBug(LOpts, GCEnabled);
assert(BT && "BugType not initialized.");
CFRefLeakReport *report = new CFRefLeakReport(*BT, LOpts, GCEnabled,
SummaryLog, N, *I, Ctx);
Ctx.EmitReport(report);
}
}
return N;
}
void RetainCountChecker::checkEndPath(CheckerContext &Ctx) const {
ProgramStateRef state = Ctx.getState();
RefBindings B = state->get<RefBindings>();
ExplodedNode *Pred = Ctx.getPredecessor();
for (RefBindings::iterator I = B.begin(), E = B.end(); I != E; ++I) {
llvm::tie(Pred, state) = handleAutoreleaseCounts(state, Pred, 0,
Ctx, I->first, I->second);
if (!state)
return;
}
if (Ctx.getLocationContext()->getParent())
return;
B = state->get<RefBindings>();
SmallVector<SymbolRef, 10> Leaked;
for (RefBindings::iterator I = B.begin(), E = B.end(); I != E; ++I)
state = handleSymbolDeath(state, I->first, I->second, Leaked);
processLeaks(state, Leaked, Ctx, Pred);
}
const ProgramPointTag *
RetainCountChecker::getDeadSymbolTag(SymbolRef sym) const {
const SimpleProgramPointTag *&tag = DeadSymbolTags[sym];
if (!tag) {
SmallString<64> buf;
llvm::raw_svector_ostream out(buf);
out << "RetainCountChecker : Dead Symbol : ";
sym->dumpToStream(out);
tag = new SimpleProgramPointTag(out.str());
}
return tag;
}
void RetainCountChecker::checkDeadSymbols(SymbolReaper &SymReaper,
CheckerContext &C) const {
ExplodedNode *Pred = C.getPredecessor();
ProgramStateRef state = C.getState();
RefBindings B = state->get<RefBindings>();
for (SymbolReaper::dead_iterator I = SymReaper.dead_begin(),
E = SymReaper.dead_end(); I != E; ++I) {
SymbolRef Sym = *I;
if (const RefVal *T = B.lookup(Sym)){
const ProgramPointTag *Tag = getDeadSymbolTag(Sym);
llvm::tie(Pred, state) = handleAutoreleaseCounts(state, Pred, Tag, C,
Sym, *T);
if (!state)
return;
}
}
B = state->get<RefBindings>();
SmallVector<SymbolRef, 10> Leaked;
for (SymbolReaper::dead_iterator I = SymReaper.dead_begin(),
E = SymReaper.dead_end(); I != E; ++I) {
if (const RefVal *T = B.lookup(*I))
state = handleSymbolDeath(state, *I, *T, Leaked);
}
Pred = processLeaks(state, Leaked, C, Pred);
if (!Pred)
return;
RefBindings::Factory &F = state->get_context<RefBindings>();
for (SymbolReaper::dead_iterator I = SymReaper.dead_begin(),
E = SymReaper.dead_end(); I != E; ++I)
B = F.remove(B, *I);
state = state->set<RefBindings>(B);
C.addTransition(state, Pred);
}
void RetainCountChecker::printState(raw_ostream &Out, ProgramStateRef State,
const char *NL, const char *Sep) const {
RefBindings B = State->get<RefBindings>();
if (!B.isEmpty())
Out << Sep << NL;
for (RefBindings::iterator I = B.begin(), E = B.end(); I != E; ++I) {
Out << I->first << " : ";
I->second.print(Out);
Out << NL;
}
}
void ento::registerRetainCountChecker(CheckerManager &Mgr) {
Mgr.registerChecker<RetainCountChecker>();
}