void
ErrorReport::ReportAddonExceptionToTelementry(JSContext* cx)
{
MOZ_ASSERT(exnObject);
RootedObject unwrapped(cx, UncheckedUnwrap(exnObject));
MOZ_ASSERT(unwrapped, "UncheckedUnwrap failed?");
// There is not much we can report if the exception is not an ErrorObject, let's ignore those.
if (!unwrapped->is<ErrorObject>())
return;
Rooted<ErrorObject*> errObj(cx, &unwrapped->as<ErrorObject>());
RootedObject stack(cx, errObj->stack());
// Let's ignore TOP level exceptions. For regular add-ons those will not be reported anyway,
// for SDK based once it should not be a valid case either.
// At this point the frame stack is unwound but the exception object stored the stack so let's
// use that for getting the function name.
if (!stack)
return;
JSCompartment* comp = stack->compartment();
JSAddonId* addonId = comp->creationOptions().addonIdOrNull();
// We only want to send the report if the scope that just have thrown belongs to an add-on.
// Let's check the compartment of the youngest function on the stack, to determine that.
if (!addonId)
return;
RootedString funnameString(cx);
JS::SavedFrameResult result = GetSavedFrameFunctionDisplayName(cx, stack, &funnameString);
// AccessDenied should never be the case here for add-ons but let's not risk it.
JSAutoByteString bytes;
const char* funname = nullptr;
bool denied = result == JS::SavedFrameResult::AccessDenied;
funname = denied ? "unknown"
: funnameString ? AtomToPrintableString(cx,
&funnameString->asAtom(),
&bytes)
: "anonymous";
UniqueChars addonIdChars(JS_EncodeString(cx, addonId));
const char* filename = nullptr;
if (reportp && reportp->filename) {
filename = strrchr(reportp->filename, '/');
if (filename)
filename++;
}
if (!filename) {
filename = "FILE_NOT_FOUND";
}
char histogramKey[64];
SprintfLiteral(histogramKey, "%s %s %s %u",
addonIdChars.get(),
funname,
filename,
(reportp ? reportp->lineno : 0) );
cx->runtime()->addTelemetry(JS_TELEMETRY_ADDON_EXCEPTIONS, 1, histogramKey);
}
