ConditionTruthVal SValBuilder::areEqual(ProgramStateRef state, SVal lhs,
SVal rhs) {
return state->isNonNull(evalEQ(state, lhs, rhs));
}
static void generateDiagnosticsForCallLike(ProgramStateRef CurrSt,
const LocationContext *LCtx,
const RefVal &CurrV, SymbolRef &Sym,
const Stmt *S,
llvm::raw_string_ostream &os) {
CallEventManager &Mgr = CurrSt->getStateManager().getCallEventManager();
if (const CallExpr *CE = dyn_cast<CallExpr>(S)) {
// Get the name of the callee (if it is available)
// from the tracked SVal.
SVal X = CurrSt->getSValAsScalarOrLoc(CE->getCallee(), LCtx);
const FunctionDecl *FD = X.getAsFunctionDecl();
// If failed, try to get it from AST.
if (!FD)
FD = dyn_cast<FunctionDecl>(CE->getCalleeDecl());
if (const auto *MD = dyn_cast<CXXMethodDecl>(CE->getCalleeDecl())) {
os << "Call to method '" << MD->getQualifiedNameAsString() << '\'';
} else if (FD) {
os << "Call to function '" << FD->getQualifiedNameAsString() << '\'';
} else {
os << "function call";
}
} else if (isa<CXXNewExpr>(S)) {
os << "Operator 'new'";
} else {
assert(isa<ObjCMessageExpr>(S));
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;
}
}
Optional<CallEventRef<>> CE = Mgr.getCall(S, CurrSt, LCtx);
auto Idx = findArgIdxOfSymbol(CurrSt, LCtx, Sym, CE);
// If index is not found, we assume that the symbol was returned.
if (!Idx) {
os << " returns ";
} else {
os << " writes ";
}
if (CurrV.getObjKind() == ObjKind::CF) {
os << "a Core Foundation object of type '"
<< Sym->getType().getAsString() << "' with a ";
} else if (CurrV.getObjKind() == ObjKind::OS) {
os << "an OSObject of type '" << getPrettyTypeName(Sym->getType())
<< "' with a ";
} else if (CurrV.getObjKind() == ObjKind::Generalized) {
os << "an object of type '" << Sym->getType().getAsString()
<< "' with a ";
} else {
assert(CurrV.getObjKind() == ObjKind::ObjC);
QualType T = Sym->getType();
if (!isa<ObjCObjectPointerType>(T)) {
os << "an Objective-C object with a ";
} else {
const ObjCObjectPointerType *PT = cast<ObjCObjectPointerType>(T);
os << "an instance of " << PT->getPointeeType().getAsString()
<< " with a ";
}
}
if (CurrV.isOwned()) {
os << "+1 retain count";
} else {
assert(CurrV.isNotOwned());
os << "+0 retain count";
}
if (Idx) {
os << " into an out parameter '";
const ParmVarDecl *PVD = (*CE)->parameters()[*Idx];
PVD->getNameForDiagnostic(os, PVD->getASTContext().getPrintingPolicy(),
/*Qualified=*/false);
os << "'";
QualType RT = (*CE)->getResultType();
if (!RT.isNull() && !RT->isVoidType()) {
SVal RV = (*CE)->getReturnValue();
if (CurrSt->isNull(RV).isConstrainedTrue()) {
os << " (assuming the call returns zero)";
} else if (CurrSt->isNonNull(RV).isConstrainedTrue()) {
os << " (assuming the call returns non-zero)";
}
}
}
}
