void StreamChecker::OpenFileAux(CheckerContext &C, const CallExpr *CE) const {
const GRState *state = C.getState();
unsigned Count = C.getNodeBuilder().getCurrentBlockCount();
SValBuilder &svalBuilder = C.getSValBuilder();
DefinedSVal RetVal =
cast<DefinedSVal>(svalBuilder.getConjuredSymbolVal(0, CE, Count));
state = state->BindExpr(CE, RetVal);
ConstraintManager &CM = C.getConstraintManager();
// Bifurcate the state into two: one with a valid FILE* pointer, the other
// with a NULL.
const GRState *stateNotNull, *stateNull;
llvm::tie(stateNotNull, stateNull) = CM.assumeDual(state, RetVal);
if (SymbolRef Sym = RetVal.getAsSymbol()) {
// if RetVal is not NULL, set the symbol's state to Opened.
stateNotNull =
stateNotNull->set<StreamState>(Sym,StreamState::getOpened(CE));
stateNull =
stateNull->set<StreamState>(Sym, StreamState::getOpenFailed(CE));
C.addTransition(stateNotNull);
C.addTransition(stateNull);
}
}
bool OSAtomicChecker::evalOSAtomicCompareAndSwap(CheckerContext &C,
const CallExpr *CE) {
// Not enough arguments to match OSAtomicCompareAndSwap?
if (CE->getNumArgs() != 3)
return false;
ASTContext &Ctx = C.getASTContext();
const Expr *oldValueExpr = CE->getArg(0);
QualType oldValueType = Ctx.getCanonicalType(oldValueExpr->getType());
const Expr *newValueExpr = CE->getArg(1);
QualType newValueType = Ctx.getCanonicalType(newValueExpr->getType());
// Do the types of 'oldValue' and 'newValue' match?
if (oldValueType != newValueType)
return false;
const Expr *theValueExpr = CE->getArg(2);
const PointerType *theValueType=theValueExpr->getType()->getAs<PointerType>();
// theValueType not a pointer?
if (!theValueType)
return false;
QualType theValueTypePointee =
Ctx.getCanonicalType(theValueType->getPointeeType()).getUnqualifiedType();
// The pointee must match newValueType and oldValueType.
if (theValueTypePointee != newValueType)
return false;
static SimpleProgramPointTag OSAtomicLoadTag("OSAtomicChecker : Load");
static SimpleProgramPointTag OSAtomicStoreTag("OSAtomicChecker : Store");
// Load 'theValue'.
ExprEngine &Engine = C.getEngine();
const ProgramState *state = C.getState();
ExplodedNodeSet Tmp;
SVal location = state->getSVal(theValueExpr);
// Here we should use the value type of the region as the load type, because
// we are simulating the semantics of the function, not the semantics of
// passing argument. So the type of theValue expr is not we are loading.
// But usually the type of the varregion is not the type we want either,
// we still need to do a CastRetrievedVal in store manager. So actually this
// LoadTy specifying can be omitted. But we put it here to emphasize the
// semantics.
QualType LoadTy;
if (const TypedValueRegion *TR =
dyn_cast_or_null<TypedValueRegion>(location.getAsRegion())) {
LoadTy = TR->getValueType();
}
Engine.evalLoad(Tmp, theValueExpr, C.getPredecessor(),
state, location, &OSAtomicLoadTag, LoadTy);
if (Tmp.empty()) {
// If no nodes were generated, other checkers must generated sinks. But
// since the builder state was restored, we set it manually to prevent
// auto transition.
// FIXME: there should be a better approach.
C.getNodeBuilder().BuildSinks = true;
return true;
}
for (ExplodedNodeSet::iterator I = Tmp.begin(), E = Tmp.end();
I != E; ++I) {
ExplodedNode *N = *I;
const ProgramState *stateLoad = N->getState();
// Use direct bindings from the environment since we are forcing a load
// from a location that the Environment would typically not be used
// to bind a value.
SVal theValueVal_untested = stateLoad->getSVal(theValueExpr, true);
SVal oldValueVal_untested = stateLoad->getSVal(oldValueExpr);
// FIXME: Issue an error.
if (theValueVal_untested.isUndef() || oldValueVal_untested.isUndef()) {
return false;
}
DefinedOrUnknownSVal theValueVal =
cast<DefinedOrUnknownSVal>(theValueVal_untested);
DefinedOrUnknownSVal oldValueVal =
cast<DefinedOrUnknownSVal>(oldValueVal_untested);
SValBuilder &svalBuilder = Engine.getSValBuilder();
// Perform the comparison.
DefinedOrUnknownSVal Cmp =
svalBuilder.evalEQ(stateLoad,theValueVal,oldValueVal);
const ProgramState *stateEqual = stateLoad->assume(Cmp, true);
// Were they equal?
if (stateEqual) {
// Perform the store.
ExplodedNodeSet TmpStore;
SVal val = stateEqual->getSVal(newValueExpr);
// Handle implicit value casts.
if (const TypedValueRegion *R =
dyn_cast_or_null<TypedValueRegion>(location.getAsRegion())) {
val = svalBuilder.evalCast(val,R->getValueType(), newValueExpr->getType());
}
Engine.evalStore(TmpStore, NULL, theValueExpr, N,
stateEqual, location, val, &OSAtomicStoreTag);
if (TmpStore.empty()) {
// If no nodes were generated, other checkers must generated sinks. But
// since the builder state was restored, we set it manually to prevent
// auto transition.
// FIXME: there should be a better approach.
C.getNodeBuilder().BuildSinks = true;
return true;
}
// Now bind the result of the comparison.
for (ExplodedNodeSet::iterator I2 = TmpStore.begin(),
E2 = TmpStore.end(); I2 != E2; ++I2) {
ExplodedNode *predNew = *I2;
const ProgramState *stateNew = predNew->getState();
// Check for 'void' return type if we have a bogus function prototype.
SVal Res = UnknownVal();
QualType T = CE->getType();
if (!T->isVoidType())
Res = Engine.getSValBuilder().makeTruthVal(true, T);
C.generateNode(stateNew->BindExpr(CE, Res), predNew);
}
}
// Were they not equal?
if (const ProgramState *stateNotEqual = stateLoad->assume(Cmp, false)) {
// Check for 'void' return type if we have a bogus function prototype.
SVal Res = UnknownVal();
QualType T = CE->getType();
if (!T->isVoidType())
Res = Engine.getSValBuilder().makeTruthVal(false, CE->getType());
C.generateNode(stateNotEqual->BindExpr(CE, Res), N);
}
}
return true;
}
