/// Insert a diagnostic piece at function exit
/// if a function parameter is annotated as "os_consumed",
/// but it does not actually consume the reference.
static std::shared_ptr<PathDiagnosticEventPiece>
annotateConsumedSummaryMismatch(const ExplodedNode *N,
CallExitBegin &CallExitLoc,
const SourceManager &SM,
CallEventManager &CEMgr) {
const ExplodedNode *CN = getCalleeNode(N);
if (!CN)
return nullptr;
CallEventRef<> Call = CEMgr.getCaller(N->getStackFrame(), N->getState());
std::string sbuf;
llvm::raw_string_ostream os(sbuf);
ArrayRef<const ParmVarDecl *> Parameters = Call->parameters();
for (unsigned I=0; I < Call->getNumArgs() && I < Parameters.size(); ++I) {
const ParmVarDecl *PVD = Parameters[I];
if (!PVD->hasAttr<OSConsumedAttr>())
continue;
if (SymbolRef SR = Call->getArgSVal(I).getAsLocSymbol()) {
const RefVal *CountBeforeCall = getRefBinding(CN->getState(), SR);
const RefVal *CountAtExit = getRefBinding(N->getState(), SR);
if (!CountBeforeCall || !CountAtExit)
continue;
unsigned CountBefore = CountBeforeCall->getCount();
unsigned CountAfter = CountAtExit->getCount();
bool AsExpected = CountBefore > 0 && CountAfter == CountBefore - 1;
if (!AsExpected) {
os << "Parameter '";
PVD->getNameForDiagnostic(os, PVD->getASTContext().getPrintingPolicy(),
/*Qualified=*/false);
os << "' is marked as consuming, but the function did not consume "
<< "the reference\n";
}
}
}
if (os.str().empty())
return nullptr;
// FIXME: remove the code duplication with NoStoreFuncVisitor.
PathDiagnosticLocation L;
if (const ReturnStmt *RS = CallExitLoc.getReturnStmt()) {
L = PathDiagnosticLocation::createBegin(RS, SM, N->getLocationContext());
} else {
L = PathDiagnosticLocation(
Call->getRuntimeDefinition().getDecl()->getSourceRange().getEnd(), SM);
}
return std::make_shared<PathDiagnosticEventPiece>(L, os.str());
}
void ExprEngine::defaultEvalCall(NodeBuilder &Bldr, ExplodedNode *Pred,
const CallEvent &CallTemplate,
const EvalCallOptions &CallOpts) {
// Make sure we have the most recent state attached to the call.
ProgramStateRef State = Pred->getState();
CallEventRef<> Call = CallTemplate.cloneWithState(State);
// Special-case trivial assignment operators.
if (isTrivialObjectAssignment(*Call)) {
performTrivialCopy(Bldr, Pred, *Call);
return;
}
// Try to inline the call.
// The origin expression here is just used as a kind of checksum;
// this should still be safe even for CallEvents that don't come from exprs.
const Expr *E = Call->getOriginExpr();
ProgramStateRef InlinedFailedState = getInlineFailedState(State, E);
if (InlinedFailedState) {
// If we already tried once and failed, make sure we don't retry later.
State = InlinedFailedState;
} else {
RuntimeDefinition RD = Call->getRuntimeDefinition();
const Decl *D = RD.getDecl();
if (shouldInlineCall(*Call, D, Pred, CallOpts)) {
if (RD.mayHaveOtherDefinitions()) {
AnalyzerOptions &Options = getAnalysisManager().options;
// Explore with and without inlining the call.
if (Options.getIPAMode() == IPAK_DynamicDispatchBifurcate) {
BifurcateCall(RD.getDispatchRegion(), *Call, D, Bldr, Pred);
return;
}
// Don't inline if we're not in any dynamic dispatch mode.
if (Options.getIPAMode() != IPAK_DynamicDispatch) {
conservativeEvalCall(*Call, Bldr, Pred, State);
return;
}
}
// We are not bifurcating and we do have a Decl, so just inline.
if (inlineCall(*Call, D, Bldr, Pred, State))
return;
}
}
// If we can't inline it, handle the return value and invalidate the regions.
conservativeEvalCall(*Call, Bldr, Pred, State);
}