HRESULT JavascriptError::GetRuntimeError(RecyclableObject* errorObject, __out_opt LPCWSTR * pMessage)
{
// Only report the error number if it is a runtime error
HRESULT hr = JSERR_UncaughtException;
ScriptContext* scriptContext = errorObject->GetScriptContext();
// This version needs to be called in script.
Assert(scriptContext->GetThreadContext()->IsScriptActive());
Var number = JavascriptOperators::GetProperty(errorObject, Js::PropertyIds::number, scriptContext, NULL);
if (TaggedInt::Is(number))
{
hr = TaggedInt::ToInt32(number);
}
else if (JavascriptNumber::Is_NoTaggedIntCheck(number))
{
hr = (HRESULT)JavascriptNumber::GetValue(number);
}
if (!FAILED(hr))
{
hr = E_FAIL;
}
if (pMessage != NULL)
{
*pMessage = _u(""); // default to have IE load the error message, by returning empty-string
// The description property always overrides any error message
Var description = Js::JavascriptOperators::GetProperty(errorObject, Js::PropertyIds::description, scriptContext, NULL);
if (JavascriptString::Is(description))
{
// Always report the description to IE if it is a string, even if the user sets it
JavascriptString * messageString = JavascriptString::FromVar(description);
*pMessage = messageString->GetSz();
}
else if (Js::JavascriptError::Is(errorObject) && Js::JavascriptError::FromVar(errorObject)->originalRuntimeErrorMessage != nullptr)
{
// use the runtime error message
*pMessage = Js::JavascriptError::FromVar(errorObject)->originalRuntimeErrorMessage;
}
else if (FACILITY_CONTROL == HRESULT_FACILITY(hr))
{
// User might have create it's own Error object with JS error code, try to load the
// resource string from the HResult by returning null;
*pMessage = nullptr;
}
}
// If neither the description or original runtime error message is set, and there are no error message.
// Then just return false and we will report Uncaught exception to IE.
return hr;
}
