ObjCAtSyncChecker.cpp [plain text]
#include "ClangSACheckers.h"
#include "clang/AST/StmtObjC.h"
#include "clang/StaticAnalyzer/Core/Checker.h"
#include "clang/StaticAnalyzer/Core/CheckerManager.h"
#include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h"
#include "clang/StaticAnalyzer/Core/BugReporter/BugType.h"
#include "clang/StaticAnalyzer/Core/PathSensitive/ExprEngine.h"
using namespace clang;
using namespace ento;
namespace {
class ObjCAtSyncChecker
: public Checker< check::PreStmt<ObjCAtSynchronizedStmt> > {
mutable OwningPtr<BuiltinBug> BT_null;
mutable OwningPtr<BuiltinBug> BT_undef;
public:
void checkPreStmt(const ObjCAtSynchronizedStmt *S, CheckerContext &C) const;
};
}
void ObjCAtSyncChecker::checkPreStmt(const ObjCAtSynchronizedStmt *S,
CheckerContext &C) const {
const Expr *Ex = S->getSynchExpr();
ProgramStateRef state = C.getState();
SVal V = state->getSVal(Ex, C.getLocationContext());
if (isa<UndefinedVal>(V)) {
if (ExplodedNode *N = C.generateSink()) {
if (!BT_undef)
BT_undef.reset(new BuiltinBug("Uninitialized value used as mutex "
"for @synchronized"));
BugReport *report =
new BugReport(*BT_undef, BT_undef->getDescription(), N);
bugreporter::trackNullOrUndefValue(N, Ex, *report);
C.EmitReport(report);
}
return;
}
if (V.isUnknown())
return;
ProgramStateRef notNullState, nullState;
llvm::tie(notNullState, nullState) = state->assume(cast<DefinedSVal>(V));
if (nullState) {
if (!notNullState) {
if (ExplodedNode *N = C.addTransition(nullState)) {
if (!BT_null)
BT_null.reset(new BuiltinBug("Nil value used as mutex for @synchronized() "
"(no synchronization will occur)"));
BugReport *report =
new BugReport(*BT_null, BT_null->getDescription(), N);
bugreporter::trackNullOrUndefValue(N, Ex, *report);
C.EmitReport(report);
return;
}
}
}
if (notNullState)
C.addTransition(notNullState);
}
void ento::registerObjCAtSyncChecker(CheckerManager &mgr) {
if (mgr.getLangOpts().ObjC2)
mgr.registerChecker<ObjCAtSyncChecker>();
}