27 using namespace clang;
31 class ObjCContainersChecker :
public Checker< check::PreStmt<CallExpr>,
32 check::PostStmt<CallExpr>,
33 check::PointerEscape> {
34 mutable std::unique_ptr<BugType> BT;
35 inline void initBugType()
const {
37 BT.reset(
new BugType(
this,
"CFArray API",
41 inline SymbolRef getArraySym(
const Expr *E, CheckerContext &C)
const {
43 SymbolRef ArraySym = ArrayRef.getAsSymbol();
47 void addSizeInfo(
const Expr *Array,
const Expr *Size,
48 CheckerContext &C)
const;
52 static void *getTag() {
static int Tag;
return &Tag; }
54 void checkPostStmt(
const CallExpr *CE, CheckerContext &C)
const;
55 void checkPreStmt(
const CallExpr *CE, CheckerContext &C)
const;
62 const char *NL,
const char *Sep)
const;
69 void ObjCContainersChecker::addSizeInfo(
const Expr *Array,
const Expr *Size,
70 CheckerContext &C)
const {
72 SVal SizeV = C.getSVal(Size);
74 if (SizeV.isUnknownOrUndef())
79 SymbolRef ArraySym = ArrayRef.getAsSymbol();
84 State->set<ArraySizeMap>(ArraySym, SizeV.castAs<DefinedSVal>()));
87 void ObjCContainersChecker::checkPostStmt(
const CallExpr *CE,
88 CheckerContext &C)
const {
89 StringRef Name = C.getCalleeName(CE);
94 if (Name.equals(
"CFArrayCreate")) {
100 addSizeInfo(CE, CE->
getArg(2), C);
104 if (Name.equals(
"CFArrayGetCount")) {
105 addSizeInfo(CE->
getArg(0), CE, C);
110 void ObjCContainersChecker::checkPreStmt(
const CallExpr *CE,
111 CheckerContext &C)
const {
112 StringRef Name = C.getCalleeName(CE);
117 if (Name.equals(
"CFArrayGetValueAtIndex")) {
123 SymbolRef ArraySym = getArraySym(ArrayExpr, C);
127 const DefinedSVal *Size = State->get<ArraySizeMap>(ArraySym);
134 SVal IdxVal = C.getSVal(IdxExpr);
135 if (IdxVal.isUnknownOrUndef())
137 DefinedSVal Idx = IdxVal.castAs<DefinedSVal>();
142 ProgramStateRef StOutBound = State->assumeInBound(Idx, *Size,
false, T);
143 if (StOutBound && !StInBound) {
144 ExplodedNode *N = C.generateErrorNode(StOutBound);
148 auto R = llvm::make_unique<BugReport>(*BT,
"Index is out of bounds", N);
150 bugreporter::trackExpressionValue(N, IdxExpr, *R,
152 C.emitReport(std::move(R));
163 for (
const auto &Sym : Escaped) {
169 State = State->remove<ArraySizeMap>(Sym);
175 const char *NL,
const char *Sep)
const {
176 ArraySizeMapTy Map = State->get<ArraySizeMap>();
180 OS << Sep <<
"ObjC container sizes :" << NL;
182 OS << I.first <<
" : " << I.second << NL;
187 void ento::registerObjCContainersChecker(CheckerManager &mgr) {
188 mgr.registerChecker<ObjCContainersChecker>();
const char *const CoreFoundationObjectiveC
A (possibly-)qualified type.
Expr * getArg(unsigned Arg)
getArg - Return the specified argument.
llvm::DenseSet< SymbolRef > InvalidatedSymbols
const SymExpr * SymbolRef
unsigned getNumArgs() const
getNumArgs - Return the number of actual arguments to this call.
IntrusiveRefCntPtr< const ProgramState > ProgramStateRef
This represents one expression.
#define REGISTER_MAP_WITH_PROGRAMSTATE(Name, Key, Value)
Declares an immutable map of type NameTy, suitable for placement into the ProgramState.
Dataflow Directional Tag Classes.
PointerEscapeKind
Describes the different reasons a pointer escapes during analysis.
Indicates that the tracking object is a descendant of a referenced-counted OSObject, used in the Darwin kernel.
SourceRange getSourceRange() const LLVM_READONLY
SourceLocation tokens are not useful in isolation - they are low level value objects created/interpre...
CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]).