| //===- IvarInvalidationChecker.cpp ------------------------------*- C++ -*-===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This checker implements annotation driven invalidation checking. If a class |
| // contains a method annotated with 'objc_instance_variable_invalidator', |
| // - (void) foo |
| // __attribute__((annotate("objc_instance_variable_invalidator"))); |
| // all the "ivalidatable" instance variables of this class should be |
| // invalidated. We call an instance variable ivalidatable if it is an object of |
| // a class which contains an invalidation method. There could be multiple |
| // methods annotated with such annotations per class, either one can be used |
| // to invalidate the ivar. An ivar or property are considered to be |
| // invalidated if they are being assigned 'nil' or an invalidation method has |
| // been called on them. An invalidation method should either invalidate all |
| // the ivars or call another invalidation method (on self). |
| // |
| // Partial invalidor annotation allows to address cases when ivars are |
| // invalidated by other methods, which might or might not be called from |
| // the invalidation method. The checker checks that each invalidation |
| // method and all the partial methods cumulatively invalidate all ivars. |
| // __attribute__((annotate("objc_instance_variable_invalidator_partial"))); |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "clang/StaticAnalyzer/Checkers/BuiltinCheckerRegistration.h" |
| #include "clang/AST/Attr.h" |
| #include "clang/AST/DeclObjC.h" |
| #include "clang/AST/StmtVisitor.h" |
| #include "clang/StaticAnalyzer/Core/BugReporter/BugReporter.h" |
| #include "clang/StaticAnalyzer/Core/Checker.h" |
| #include "clang/StaticAnalyzer/Core/PathSensitive/AnalysisManager.h" |
| #include "llvm/ADT/DenseMap.h" |
| #include "llvm/ADT/SetVector.h" |
| #include "llvm/ADT/SmallString.h" |
| |
| using namespace clang; |
| using namespace ento; |
| |
| namespace { |
| struct ChecksFilter { |
| /// Check for missing invalidation method declarations. |
| DefaultBool check_MissingInvalidationMethod; |
| /// Check that all ivars are invalidated. |
| DefaultBool check_InstanceVariableInvalidation; |
| |
| CheckerNameRef checkName_MissingInvalidationMethod; |
| CheckerNameRef checkName_InstanceVariableInvalidation; |
| }; |
| |
| class IvarInvalidationCheckerImpl { |
| typedef llvm::SmallSetVector<const ObjCMethodDecl*, 2> MethodSet; |
| typedef llvm::DenseMap<const ObjCMethodDecl*, |
| const ObjCIvarDecl*> MethToIvarMapTy; |
| typedef llvm::DenseMap<const ObjCPropertyDecl*, |
| const ObjCIvarDecl*> PropToIvarMapTy; |
| typedef llvm::DenseMap<const ObjCIvarDecl*, |
| const ObjCPropertyDecl*> IvarToPropMapTy; |
| |
| struct InvalidationInfo { |
| /// Has the ivar been invalidated? |
| bool IsInvalidated; |
| |
| /// The methods which can be used to invalidate the ivar. |
| MethodSet InvalidationMethods; |
| |
| InvalidationInfo() : IsInvalidated(false) {} |
| void addInvalidationMethod(const ObjCMethodDecl *MD) { |
| InvalidationMethods.insert(MD); |
| } |
| |
| bool needsInvalidation() const { |
| return !InvalidationMethods.empty(); |
| } |
| |
| bool hasMethod(const ObjCMethodDecl *MD) { |
| if (IsInvalidated) |
| return true; |
| for (MethodSet::iterator I = InvalidationMethods.begin(), |
| E = InvalidationMethods.end(); I != E; ++I) { |
| if (*I == MD) { |
| IsInvalidated = true; |
| return true; |
| } |
| } |
| return false; |
| } |
| }; |
| |
| typedef llvm::DenseMap<const ObjCIvarDecl*, InvalidationInfo> IvarSet; |
| |
| /// Statement visitor, which walks the method body and flags the ivars |
| /// referenced in it (either directly or via property). |
| class MethodCrawler : public ConstStmtVisitor<MethodCrawler> { |
| /// The set of Ivars which need to be invalidated. |
| IvarSet &IVars; |
| |
| /// Flag is set as the result of a message send to another |
| /// invalidation method. |
| bool &CalledAnotherInvalidationMethod; |
| |
| /// Property setter to ivar mapping. |
| const MethToIvarMapTy &PropertySetterToIvarMap; |
| |
| /// Property getter to ivar mapping. |
| const MethToIvarMapTy &PropertyGetterToIvarMap; |
| |
| /// Property to ivar mapping. |
| const PropToIvarMapTy &PropertyToIvarMap; |
| |
| /// The invalidation method being currently processed. |
| const ObjCMethodDecl *InvalidationMethod; |
| |
| ASTContext &Ctx; |
| |
| /// Peel off parens, casts, OpaqueValueExpr, and PseudoObjectExpr. |
| const Expr *peel(const Expr *E) const; |
| |
| /// Does this expression represent zero: '0'? |
| bool isZero(const Expr *E) const; |
| |
| /// Mark the given ivar as invalidated. |
| void markInvalidated(const ObjCIvarDecl *Iv); |
| |
| /// Checks if IvarRef refers to the tracked IVar, if yes, marks it as |
| /// invalidated. |
| void checkObjCIvarRefExpr(const ObjCIvarRefExpr *IvarRef); |
| |
| /// Checks if ObjCPropertyRefExpr refers to the tracked IVar, if yes, marks |
| /// it as invalidated. |
| void checkObjCPropertyRefExpr(const ObjCPropertyRefExpr *PA); |
| |
| /// Checks if ObjCMessageExpr refers to (is a getter for) the tracked IVar, |
| /// if yes, marks it as invalidated. |
| void checkObjCMessageExpr(const ObjCMessageExpr *ME); |
| |
| /// Checks if the Expr refers to an ivar, if yes, marks it as invalidated. |
| void check(const Expr *E); |
| |
| public: |
| MethodCrawler(IvarSet &InIVars, |
| bool &InCalledAnotherInvalidationMethod, |
| const MethToIvarMapTy &InPropertySetterToIvarMap, |
| const MethToIvarMapTy &InPropertyGetterToIvarMap, |
| const PropToIvarMapTy &InPropertyToIvarMap, |
| ASTContext &InCtx) |
| : IVars(InIVars), |
| CalledAnotherInvalidationMethod(InCalledAnotherInvalidationMethod), |
| PropertySetterToIvarMap(InPropertySetterToIvarMap), |
| PropertyGetterToIvarMap(InPropertyGetterToIvarMap), |
| PropertyToIvarMap(InPropertyToIvarMap), |
| InvalidationMethod(nullptr), |
| Ctx(InCtx) {} |
| |
| void VisitStmt(const Stmt *S) { VisitChildren(S); } |
| |
| void VisitBinaryOperator(const BinaryOperator *BO); |
| |
| void VisitObjCMessageExpr(const ObjCMessageExpr *ME); |
| |
| void VisitChildren(const Stmt *S) { |
| for (const auto *Child : S->children()) { |
| if (Child) |
| this->Visit(Child); |
| if (CalledAnotherInvalidationMethod) |
| return; |
| } |
| } |
| }; |
| |
| /// Check if the any of the methods inside the interface are annotated with |
| /// the invalidation annotation, update the IvarInfo accordingly. |
| /// \param LookForPartial is set when we are searching for partial |
| /// invalidators. |
| static void containsInvalidationMethod(const ObjCContainerDecl *D, |
| InvalidationInfo &Out, |
| bool LookForPartial); |
| |
| /// Check if ivar should be tracked and add to TrackedIvars if positive. |
| /// Returns true if ivar should be tracked. |
| static bool trackIvar(const ObjCIvarDecl *Iv, IvarSet &TrackedIvars, |
| const ObjCIvarDecl **FirstIvarDecl); |
| |
| /// Given the property declaration, and the list of tracked ivars, finds |
| /// the ivar backing the property when possible. Returns '0' when no such |
| /// ivar could be found. |
| static const ObjCIvarDecl *findPropertyBackingIvar( |
| const ObjCPropertyDecl *Prop, |
| const ObjCInterfaceDecl *InterfaceD, |
| IvarSet &TrackedIvars, |
| const ObjCIvarDecl **FirstIvarDecl); |
| |
| /// Print ivar name or the property if the given ivar backs a property. |
| static void printIvar(llvm::raw_svector_ostream &os, |
| const ObjCIvarDecl *IvarDecl, |
| const IvarToPropMapTy &IvarToPopertyMap); |
| |
| void reportNoInvalidationMethod(CheckerNameRef CheckName, |
| const ObjCIvarDecl *FirstIvarDecl, |
| const IvarToPropMapTy &IvarToPopertyMap, |
| const ObjCInterfaceDecl *InterfaceD, |
| bool MissingDeclaration) const; |
| |
| void reportIvarNeedsInvalidation(const ObjCIvarDecl *IvarD, |
| const IvarToPropMapTy &IvarToPopertyMap, |
| const ObjCMethodDecl *MethodD) const; |
| |
| AnalysisManager& Mgr; |
| BugReporter &BR; |
| /// Filter on the checks performed. |
| const ChecksFilter &Filter; |
| |
| public: |
| IvarInvalidationCheckerImpl(AnalysisManager& InMgr, |
| BugReporter &InBR, |
| const ChecksFilter &InFilter) : |
| Mgr (InMgr), BR(InBR), Filter(InFilter) {} |
| |
| void visit(const ObjCImplementationDecl *D) const; |
| }; |
| |
| static bool isInvalidationMethod(const ObjCMethodDecl *M, bool LookForPartial) { |
| for (const auto *Ann : M->specific_attrs<AnnotateAttr>()) { |
| if (!LookForPartial && |
| Ann->getAnnotation() == "objc_instance_variable_invalidator") |
| return true; |
| if (LookForPartial && |
| Ann->getAnnotation() == "objc_instance_variable_invalidator_partial") |
| return true; |
| } |
| return false; |
| } |
| |
| void IvarInvalidationCheckerImpl::containsInvalidationMethod( |
| const ObjCContainerDecl *D, InvalidationInfo &OutInfo, bool Partial) { |
| |
| if (!D) |
| return; |
| |
| assert(!isa<ObjCImplementationDecl>(D)); |
| // TODO: Cache the results. |
| |
| // Check all methods. |
| for (const auto *MDI : D->methods()) |
| if (isInvalidationMethod(MDI, Partial)) |
| OutInfo.addInvalidationMethod( |
| cast<ObjCMethodDecl>(MDI->getCanonicalDecl())); |
| |
| // If interface, check all parent protocols and super. |
| if (const ObjCInterfaceDecl *InterfD = dyn_cast<ObjCInterfaceDecl>(D)) { |
| |
| // Visit all protocols. |
| for (const auto *I : InterfD->protocols()) |
| containsInvalidationMethod(I->getDefinition(), OutInfo, Partial); |
| |
| // Visit all categories in case the invalidation method is declared in |
| // a category. |
| for (const auto *Ext : InterfD->visible_extensions()) |
| containsInvalidationMethod(Ext, OutInfo, Partial); |
| |
| containsInvalidationMethod(InterfD->getSuperClass(), OutInfo, Partial); |
| return; |
| } |
| |
| // If protocol, check all parent protocols. |
| if (const ObjCProtocolDecl *ProtD = dyn_cast<ObjCProtocolDecl>(D)) { |
| for (const auto *I : ProtD->protocols()) { |
| containsInvalidationMethod(I->getDefinition(), OutInfo, Partial); |
| } |
| return; |
| } |
| } |
| |
| bool IvarInvalidationCheckerImpl::trackIvar(const ObjCIvarDecl *Iv, |
| IvarSet &TrackedIvars, |
| const ObjCIvarDecl **FirstIvarDecl) { |
| QualType IvQTy = Iv->getType(); |
| const ObjCObjectPointerType *IvTy = IvQTy->getAs<ObjCObjectPointerType>(); |
| if (!IvTy) |
| return false; |
| const ObjCInterfaceDecl *IvInterf = IvTy->getInterfaceDecl(); |
| |
| InvalidationInfo Info; |
| containsInvalidationMethod(IvInterf, Info, /*LookForPartial*/ false); |
| if (Info.needsInvalidation()) { |
| const ObjCIvarDecl *I = cast<ObjCIvarDecl>(Iv->getCanonicalDecl()); |
| TrackedIvars[I] = Info; |
| if (!*FirstIvarDecl) |
| *FirstIvarDecl = I; |
| return true; |
| } |
| return false; |
| } |
| |
| const ObjCIvarDecl *IvarInvalidationCheckerImpl::findPropertyBackingIvar( |
| const ObjCPropertyDecl *Prop, |
| const ObjCInterfaceDecl *InterfaceD, |
| IvarSet &TrackedIvars, |
| const ObjCIvarDecl **FirstIvarDecl) { |
| const ObjCIvarDecl *IvarD = nullptr; |
| |
| // Lookup for the synthesized case. |
| IvarD = Prop->getPropertyIvarDecl(); |
| // We only track the ivars/properties that are defined in the current |
| // class (not the parent). |
| if (IvarD && IvarD->getContainingInterface() == InterfaceD) { |
| if (TrackedIvars.count(IvarD)) { |
| return IvarD; |
| } |
| // If the ivar is synthesized we still want to track it. |
| if (trackIvar(IvarD, TrackedIvars, FirstIvarDecl)) |
| return IvarD; |
| } |
| |
| // Lookup IVars named "_PropName"or "PropName" among the tracked Ivars. |
| StringRef PropName = Prop->getIdentifier()->getName(); |
| for (IvarSet::const_iterator I = TrackedIvars.begin(), |
| E = TrackedIvars.end(); I != E; ++I) { |
| const ObjCIvarDecl *Iv = I->first; |
| StringRef IvarName = Iv->getName(); |
| |
| if (IvarName == PropName) |
| return Iv; |
| |
| SmallString<128> PropNameWithUnderscore; |
| { |
| llvm::raw_svector_ostream os(PropNameWithUnderscore); |
| os << '_' << PropName; |
| } |
| if (IvarName == PropNameWithUnderscore) |
| return Iv; |
| } |
| |
| // Note, this is a possible source of false positives. We could look at the |
| // getter implementation to find the ivar when its name is not derived from |
| // the property name. |
| return nullptr; |
| } |
| |
| void IvarInvalidationCheckerImpl::printIvar(llvm::raw_svector_ostream &os, |
| const ObjCIvarDecl *IvarDecl, |
| const IvarToPropMapTy &IvarToPopertyMap) { |
| if (IvarDecl->getSynthesize()) { |
| const ObjCPropertyDecl *PD = IvarToPopertyMap.lookup(IvarDecl); |
| assert(PD &&"Do we synthesize ivars for something other than properties?"); |
| os << "Property "<< PD->getName() << " "; |
| } else { |
| os << "Instance variable "<< IvarDecl->getName() << " "; |
| } |
| } |
| |
| // Check that the invalidatable interfaces with ivars/properties implement the |
| // invalidation methods. |
| void IvarInvalidationCheckerImpl:: |
| visit(const ObjCImplementationDecl *ImplD) const { |
| // Collect all ivars that need cleanup. |
| IvarSet Ivars; |
| // Record the first Ivar needing invalidation; used in reporting when only |
| // one ivar is sufficient. Cannot grab the first on the Ivars set to ensure |
| // deterministic output. |
| const ObjCIvarDecl *FirstIvarDecl = nullptr; |
| const ObjCInterfaceDecl *InterfaceD = ImplD->getClassInterface(); |
| |
| // Collect ivars declared in this class, its extensions and its implementation |
| ObjCInterfaceDecl *IDecl = const_cast<ObjCInterfaceDecl *>(InterfaceD); |
| for (const ObjCIvarDecl *Iv = IDecl->all_declared_ivar_begin(); Iv; |
| Iv= Iv->getNextIvar()) |
| trackIvar(Iv, Ivars, &FirstIvarDecl); |
| |
| // Construct Property/Property Accessor to Ivar maps to assist checking if an |
| // ivar which is backing a property has been reset. |
| MethToIvarMapTy PropSetterToIvarMap; |
| MethToIvarMapTy PropGetterToIvarMap; |
| PropToIvarMapTy PropertyToIvarMap; |
| IvarToPropMapTy IvarToPopertyMap; |
| |
| ObjCInterfaceDecl::PropertyMap PropMap; |
| ObjCInterfaceDecl::PropertyDeclOrder PropOrder; |
| InterfaceD->collectPropertiesToImplement(PropMap, PropOrder); |
| |
| for (ObjCInterfaceDecl::PropertyMap::iterator |
| I = PropMap.begin(), E = PropMap.end(); I != E; ++I) { |
| const ObjCPropertyDecl *PD = I->second; |
| if (PD->isClassProperty()) |
| continue; |
| |
| const ObjCIvarDecl *ID = findPropertyBackingIvar(PD, InterfaceD, Ivars, |
| &FirstIvarDecl); |
| if (!ID) |
| continue; |
| |
| // Store the mappings. |
| PD = cast<ObjCPropertyDecl>(PD->getCanonicalDecl()); |
| PropertyToIvarMap[PD] = ID; |
| IvarToPopertyMap[ID] = PD; |
| |
| // Find the setter and the getter. |
| const ObjCMethodDecl *SetterD = PD->getSetterMethodDecl(); |
| if (SetterD) { |
| SetterD = SetterD->getCanonicalDecl(); |
| PropSetterToIvarMap[SetterD] = ID; |
| } |
| |
| const ObjCMethodDecl *GetterD = PD->getGetterMethodDecl(); |
| if (GetterD) { |
| GetterD = GetterD->getCanonicalDecl(); |
| PropGetterToIvarMap[GetterD] = ID; |
| } |
| } |
| |
| // If no ivars need invalidation, there is nothing to check here. |
| if (Ivars.empty()) |
| return; |
| |
| // Find all partial invalidation methods. |
| InvalidationInfo PartialInfo; |
| containsInvalidationMethod(InterfaceD, PartialInfo, /*LookForPartial*/ true); |
| |
| // Remove ivars invalidated by the partial invalidation methods. They do not |
| // need to be invalidated in the regular invalidation methods. |
| bool AtImplementationContainsAtLeastOnePartialInvalidationMethod = false; |
| for (MethodSet::iterator |
| I = PartialInfo.InvalidationMethods.begin(), |
| E = PartialInfo.InvalidationMethods.end(); I != E; ++I) { |
| const ObjCMethodDecl *InterfD = *I; |
| |
| // Get the corresponding method in the @implementation. |
| const ObjCMethodDecl *D = ImplD->getMethod(InterfD->getSelector(), |
| InterfD->isInstanceMethod()); |
| if (D && D->hasBody()) { |
| AtImplementationContainsAtLeastOnePartialInvalidationMethod = true; |
| |
| bool CalledAnotherInvalidationMethod = false; |
| // The MethodCrowler is going to remove the invalidated ivars. |
| MethodCrawler(Ivars, |
| CalledAnotherInvalidationMethod, |
| PropSetterToIvarMap, |
| PropGetterToIvarMap, |
| PropertyToIvarMap, |
| BR.getContext()).VisitStmt(D->getBody()); |
| // If another invalidation method was called, trust that full invalidation |
| // has occurred. |
| if (CalledAnotherInvalidationMethod) |
| Ivars.clear(); |
| } |
| } |
| |
| // If all ivars have been invalidated by partial invalidators, there is |
| // nothing to check here. |
| if (Ivars.empty()) |
| return; |
| |
| // Find all invalidation methods in this @interface declaration and parents. |
| InvalidationInfo Info; |
| containsInvalidationMethod(InterfaceD, Info, /*LookForPartial*/ false); |
| |
| // Report an error in case none of the invalidation methods are declared. |
| if (!Info.needsInvalidation() && !PartialInfo.needsInvalidation()) { |
| if (Filter.check_MissingInvalidationMethod) |
| reportNoInvalidationMethod(Filter.checkName_MissingInvalidationMethod, |
| FirstIvarDecl, IvarToPopertyMap, InterfaceD, |
| /*MissingDeclaration*/ true); |
| // If there are no invalidation methods, there is no ivar validation work |
| // to be done. |
| return; |
| } |
| |
| // Only check if Ivars are invalidated when InstanceVariableInvalidation |
| // has been requested. |
| if (!Filter.check_InstanceVariableInvalidation) |
| return; |
| |
| // Check that all ivars are invalidated by the invalidation methods. |
| bool AtImplementationContainsAtLeastOneInvalidationMethod = false; |
| for (MethodSet::iterator I = Info.InvalidationMethods.begin(), |
| E = Info.InvalidationMethods.end(); I != E; ++I) { |
| const ObjCMethodDecl *InterfD = *I; |
| |
| // Get the corresponding method in the @implementation. |
| const ObjCMethodDecl *D = ImplD->getMethod(InterfD->getSelector(), |
| InterfD->isInstanceMethod()); |
| if (D && D->hasBody()) { |
| AtImplementationContainsAtLeastOneInvalidationMethod = true; |
| |
| // Get a copy of ivars needing invalidation. |
| IvarSet IvarsI = Ivars; |
| |
| bool CalledAnotherInvalidationMethod = false; |
| MethodCrawler(IvarsI, |
| CalledAnotherInvalidationMethod, |
| PropSetterToIvarMap, |
| PropGetterToIvarMap, |
| PropertyToIvarMap, |
| BR.getContext()).VisitStmt(D->getBody()); |
| // If another invalidation method was called, trust that full invalidation |
| // has occurred. |
| if (CalledAnotherInvalidationMethod) |
| continue; |
| |
| // Warn on the ivars that were not invalidated by the method. |
| for (IvarSet::const_iterator |
| I = IvarsI.begin(), E = IvarsI.end(); I != E; ++I) |
| reportIvarNeedsInvalidation(I->first, IvarToPopertyMap, D); |
| } |
| } |
| |
| // Report an error in case none of the invalidation methods are implemented. |
| if (!AtImplementationContainsAtLeastOneInvalidationMethod) { |
| if (AtImplementationContainsAtLeastOnePartialInvalidationMethod) { |
| // Warn on the ivars that were not invalidated by the prrtial |
| // invalidation methods. |
| for (IvarSet::const_iterator |
| I = Ivars.begin(), E = Ivars.end(); I != E; ++I) |
| reportIvarNeedsInvalidation(I->first, IvarToPopertyMap, nullptr); |
| } else { |
| // Otherwise, no invalidation methods were implemented. |
| reportNoInvalidationMethod(Filter.checkName_InstanceVariableInvalidation, |
| FirstIvarDecl, IvarToPopertyMap, InterfaceD, |
| /*MissingDeclaration*/ false); |
| } |
| } |
| } |
| |
| void IvarInvalidationCheckerImpl::reportNoInvalidationMethod( |
| CheckerNameRef CheckName, const ObjCIvarDecl *FirstIvarDecl, |
| const IvarToPropMapTy &IvarToPopertyMap, |
| const ObjCInterfaceDecl *InterfaceD, bool MissingDeclaration) const { |
| SmallString<128> sbuf; |
| llvm::raw_svector_ostream os(sbuf); |
| assert(FirstIvarDecl); |
| printIvar(os, FirstIvarDecl, IvarToPopertyMap); |
| os << "needs to be invalidated; "; |
| if (MissingDeclaration) |
| os << "no invalidation method is declared for "; |
| else |
| os << "no invalidation method is defined in the @implementation for "; |
| os << InterfaceD->getName(); |
| |
| PathDiagnosticLocation IvarDecLocation = |
| PathDiagnosticLocation::createBegin(FirstIvarDecl, BR.getSourceManager()); |
| |
| BR.EmitBasicReport(FirstIvarDecl, CheckName, "Incomplete invalidation", |
| categories::CoreFoundationObjectiveC, os.str(), |
| IvarDecLocation); |
| } |
| |
| void IvarInvalidationCheckerImpl:: |
| reportIvarNeedsInvalidation(const ObjCIvarDecl *IvarD, |
| const IvarToPropMapTy &IvarToPopertyMap, |
| const ObjCMethodDecl *MethodD) const { |
| SmallString<128> sbuf; |
| llvm::raw_svector_ostream os(sbuf); |
| printIvar(os, IvarD, IvarToPopertyMap); |
| os << "needs to be invalidated or set to nil"; |
| if (MethodD) { |
| PathDiagnosticLocation MethodDecLocation = |
| PathDiagnosticLocation::createEnd(MethodD->getBody(), |
| BR.getSourceManager(), |
| Mgr.getAnalysisDeclContext(MethodD)); |
| BR.EmitBasicReport(MethodD, Filter.checkName_InstanceVariableInvalidation, |
| "Incomplete invalidation", |
| categories::CoreFoundationObjectiveC, os.str(), |
| MethodDecLocation); |
| } else { |
| BR.EmitBasicReport( |
| IvarD, Filter.checkName_InstanceVariableInvalidation, |
| "Incomplete invalidation", categories::CoreFoundationObjectiveC, |
| os.str(), |
| PathDiagnosticLocation::createBegin(IvarD, BR.getSourceManager())); |
| } |
| } |
| |
| void IvarInvalidationCheckerImpl::MethodCrawler::markInvalidated( |
| const ObjCIvarDecl *Iv) { |
| IvarSet::iterator I = IVars.find(Iv); |
| if (I != IVars.end()) { |
| // If InvalidationMethod is present, we are processing the message send and |
| // should ensure we are invalidating with the appropriate method, |
| // otherwise, we are processing setting to 'nil'. |
| if (!InvalidationMethod || I->second.hasMethod(InvalidationMethod)) |
| IVars.erase(I); |
| } |
| } |
| |
| const Expr *IvarInvalidationCheckerImpl::MethodCrawler::peel(const Expr *E) const { |
| E = E->IgnoreParenCasts(); |
| if (const PseudoObjectExpr *POE = dyn_cast<PseudoObjectExpr>(E)) |
| E = POE->getSyntacticForm()->IgnoreParenCasts(); |
| if (const OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(E)) |
| E = OVE->getSourceExpr()->IgnoreParenCasts(); |
| return E; |
| } |
| |
| void IvarInvalidationCheckerImpl::MethodCrawler::checkObjCIvarRefExpr( |
| const ObjCIvarRefExpr *IvarRef) { |
| if (const Decl *D = IvarRef->getDecl()) |
| markInvalidated(cast<ObjCIvarDecl>(D->getCanonicalDecl())); |
| } |
| |
| void IvarInvalidationCheckerImpl::MethodCrawler::checkObjCMessageExpr( |
| const ObjCMessageExpr *ME) { |
| const ObjCMethodDecl *MD = ME->getMethodDecl(); |
| if (MD) { |
| MD = MD->getCanonicalDecl(); |
| MethToIvarMapTy::const_iterator IvI = PropertyGetterToIvarMap.find(MD); |
| if (IvI != PropertyGetterToIvarMap.end()) |
| markInvalidated(IvI->second); |
| } |
| } |
| |
| void IvarInvalidationCheckerImpl::MethodCrawler::checkObjCPropertyRefExpr( |
| const ObjCPropertyRefExpr *PA) { |
| |
| if (PA->isExplicitProperty()) { |
| const ObjCPropertyDecl *PD = PA->getExplicitProperty(); |
| if (PD) { |
| PD = cast<ObjCPropertyDecl>(PD->getCanonicalDecl()); |
| PropToIvarMapTy::const_iterator IvI = PropertyToIvarMap.find(PD); |
| if (IvI != PropertyToIvarMap.end()) |
| markInvalidated(IvI->second); |
| return; |
| } |
| } |
| |
| if (PA->isImplicitProperty()) { |
| const ObjCMethodDecl *MD = PA->getImplicitPropertySetter(); |
| if (MD) { |
| MD = MD->getCanonicalDecl(); |
| MethToIvarMapTy::const_iterator IvI =PropertyGetterToIvarMap.find(MD); |
| if (IvI != PropertyGetterToIvarMap.end()) |
| markInvalidated(IvI->second); |
| return; |
| } |
| } |
| } |
| |
| bool IvarInvalidationCheckerImpl::MethodCrawler::isZero(const Expr *E) const { |
| E = peel(E); |
| |
| return (E->isNullPointerConstant(Ctx, Expr::NPC_ValueDependentIsNotNull) |
| != Expr::NPCK_NotNull); |
| } |
| |
| void IvarInvalidationCheckerImpl::MethodCrawler::check(const Expr *E) { |
| E = peel(E); |
| |
| if (const ObjCIvarRefExpr *IvarRef = dyn_cast<ObjCIvarRefExpr>(E)) { |
| checkObjCIvarRefExpr(IvarRef); |
| return; |
| } |
| |
| if (const ObjCPropertyRefExpr *PropRef = dyn_cast<ObjCPropertyRefExpr>(E)) { |
| checkObjCPropertyRefExpr(PropRef); |
| return; |
| } |
| |
| if (const ObjCMessageExpr *MsgExpr = dyn_cast<ObjCMessageExpr>(E)) { |
| checkObjCMessageExpr(MsgExpr); |
| return; |
| } |
| } |
| |
| void IvarInvalidationCheckerImpl::MethodCrawler::VisitBinaryOperator( |
| const BinaryOperator *BO) { |
| VisitStmt(BO); |
| |
| // Do we assign/compare against zero? If yes, check the variable we are |
| // assigning to. |
| BinaryOperatorKind Opcode = BO->getOpcode(); |
| if (Opcode != BO_Assign && |
| Opcode != BO_EQ && |
| Opcode != BO_NE) |
| return; |
| |
| if (isZero(BO->getRHS())) { |
| check(BO->getLHS()); |
| return; |
| } |
| |
| if (Opcode != BO_Assign && isZero(BO->getLHS())) { |
| check(BO->getRHS()); |
| return; |
| } |
| } |
| |
| void IvarInvalidationCheckerImpl::MethodCrawler::VisitObjCMessageExpr( |
| const ObjCMessageExpr *ME) { |
| const ObjCMethodDecl *MD = ME->getMethodDecl(); |
| const Expr *Receiver = ME->getInstanceReceiver(); |
| |
| // Stop if we are calling '[self invalidate]'. |
| if (Receiver && isInvalidationMethod(MD, /*LookForPartial*/ false)) |
| if (Receiver->isObjCSelfExpr()) { |
| CalledAnotherInvalidationMethod = true; |
| return; |
| } |
| |
| // Check if we call a setter and set the property to 'nil'. |
| if (MD && (ME->getNumArgs() == 1) && isZero(ME->getArg(0))) { |
| MD = MD->getCanonicalDecl(); |
| MethToIvarMapTy::const_iterator IvI = PropertySetterToIvarMap.find(MD); |
| if (IvI != PropertySetterToIvarMap.end()) { |
| markInvalidated(IvI->second); |
| return; |
| } |
| } |
| |
| // Check if we call the 'invalidation' routine on the ivar. |
| if (Receiver) { |
| InvalidationMethod = MD; |
| check(Receiver->IgnoreParenCasts()); |
| InvalidationMethod = nullptr; |
| } |
| |
| VisitStmt(ME); |
| } |
| } // end anonymous namespace |
| |
| // Register the checkers. |
| namespace { |
| class IvarInvalidationChecker : |
| public Checker<check::ASTDecl<ObjCImplementationDecl> > { |
| public: |
| ChecksFilter Filter; |
| public: |
| void checkASTDecl(const ObjCImplementationDecl *D, AnalysisManager& Mgr, |
| BugReporter &BR) const { |
| IvarInvalidationCheckerImpl Walker(Mgr, BR, Filter); |
| Walker.visit(D); |
| } |
| }; |
| } // end anonymous namespace |
| |
| void ento::registerIvarInvalidationModeling(CheckerManager &mgr) { |
| mgr.registerChecker<IvarInvalidationChecker>(); |
| } |
| |
| bool ento::shouldRegisterIvarInvalidationModeling(const LangOptions &LO) { |
| return true; |
| } |
| |
| #define REGISTER_CHECKER(name) \ |
| void ento::register##name(CheckerManager &mgr) { \ |
| IvarInvalidationChecker *checker = \ |
| mgr.getChecker<IvarInvalidationChecker>(); \ |
| checker->Filter.check_##name = true; \ |
| checker->Filter.checkName_##name = mgr.getCurrentCheckerName(); \ |
| } \ |
| \ |
| bool ento::shouldRegister##name(const LangOptions &LO) { return true; } |
| |
| REGISTER_CHECKER(InstanceVariableInvalidation) |
| REGISTER_CHECKER(MissingInvalidationMethod) |