C++ TryCatch::HasCaught方法代码示例

void CJavascriptException::ThrowIf(v8::Isolate *isolate, v8::TryCatch& try_catch)
{
  if (try_catch.HasCaught() && try_catch.CanContinue())
  {
    v8::HandleScope handle_scope(isolate);

    PyObject *type = NULL;
    v8::Handle<v8::Value> obj = try_catch.Exception();

    if (obj->IsObject())
    {
      v8::Handle<v8::Object> exc = obj->ToObject();
      v8::Handle<v8::String> name = v8::String::NewFromUtf8(isolate, "name");

      if (exc->Has(name))
      {
        v8::String::Utf8Value s(v8::Handle<v8::String>::Cast(exc->Get(name)));

        for (size_t i=0; i<_countof(SupportErrors); i++)
        {
          if (strnicmp(SupportErrors[i].name, *s, s.length()) == 0)
          {
            type = SupportErrors[i].type;
          }
        }
      }
    }

    throw CJavascriptException(isolate, try_catch, type);
  }
}

AdblockPlus::JsValuePtr AdblockPlus::JsValue::Call(const JsValueList& params, JsValuePtr thisPtr) const
{
  if (!IsFunction())
    throw new std::runtime_error("Attempting to call a non-function");

  const JsContext context(jsEngine);
  if (!thisPtr)
  {
	  v8::Local<v8::Context> localContext = v8::Local<v8::Context>::New(jsEngine->GetIsolate(), *jsEngine->context);
    thisPtr = JsValuePtr(new JsValue(jsEngine, localContext->Global()));
  }
  if (!thisPtr->IsObject())
    throw new std::runtime_error("`this` pointer has to be an object");
  v8::Local<v8::Object> thisObj = v8::Local<v8::Object>::Cast(thisPtr->UnwrapValue());

  std::vector<v8::Handle<v8::Value>> argv;
  for (JsValueList::const_iterator it = params.begin(); it != params.end(); ++it)
    argv.push_back((*it)->UnwrapValue());

  const v8::TryCatch tryCatch;
  v8::Local<v8::Function> func = v8::Local<v8::Function>::Cast(UnwrapValue());
  v8::Local<v8::Value> result = func->Call(thisObj, argv.size(),
      argv.size() ? &argv.front() : 0);

  if (tryCatch.HasCaught())
    throw JsError(tryCatch.Exception(), tryCatch.Message());

  return JsValuePtr(new JsValue(jsEngine, result));
}

void InjectedScript::wrapEvaluateResult(ErrorString* errorString, v8::MaybeLocal<v8::Value> maybeResultValue, const v8::TryCatch& tryCatch, const String16& objectGroup, bool returnByValue, bool generatePreview, std::unique_ptr<protocol::Runtime::RemoteObject>* result, Maybe<bool>* wasThrown, Maybe<protocol::Runtime::ExceptionDetails>* exceptionDetails)
{
    v8::Local<v8::Value> resultValue;
    if (!tryCatch.HasCaught()) {
        if (hasInternalError(errorString, !maybeResultValue.ToLocal(&resultValue)))
            return;
        std::unique_ptr<RemoteObject> remoteObject = wrapObject(errorString, resultValue, objectGroup, returnByValue, generatePreview);
        if (!remoteObject)
            return;
        if (objectGroup == "console")
            m_lastEvaluationResult.Reset(m_context->isolate(), resultValue);
        *result = std::move(remoteObject);
        if (wasThrown)
            *wasThrown = false;
    } else {
        v8::Local<v8::Value> exception = tryCatch.Exception();
        std::unique_ptr<RemoteObject> remoteObject = wrapObject(errorString, exception, objectGroup, false, generatePreview && !exception->IsNativeError());
        if (!remoteObject)
            return;
        *result = std::move(remoteObject);
        if (exceptionDetails)
            *exceptionDetails = createExceptionDetails(tryCatch.Message());
        if (wasThrown)
            *wasThrown = true;
    }
}

void Executor::HandleV8Error (v8::TryCatch& tryCatch,
                              v8::Handle<v8::Value>& result) {
  ISOLATE;
  if (tryCatch.HasCaught()) {
    // caught a V8 exception
    if (! tryCatch.CanContinue()) {
      // request was cancelled
      TRI_GET_GLOBALS();
      v8g->_canceled = true;

      THROW_ARANGO_EXCEPTION(TRI_ERROR_REQUEST_CANCELED);
    }

    // request was not cancelled, but some other error occurred
    // peek into the exception
    if (tryCatch.Exception()->IsObject()) {
      // cast the exception to an object

      v8::Handle<v8::Array> objValue = v8::Handle<v8::Array>::Cast(tryCatch.Exception());
      v8::Handle<v8::String> errorNum = TRI_V8_ASCII_STRING("errorNum");
      v8::Handle<v8::String> errorMessage = TRI_V8_ASCII_STRING("errorMessage");
        
      if (objValue->HasOwnProperty(errorNum) && 
          objValue->HasOwnProperty(errorMessage)) {
        v8::Handle<v8::Value> errorNumValue = objValue->Get(errorNum);
        v8::Handle<v8::Value> errorMessageValue = objValue->Get(errorMessage);

        // found something that looks like an ArangoError
        if ((errorNumValue->IsNumber() || errorNumValue->IsNumberObject()) && 
            (errorMessageValue->IsString() || errorMessageValue->IsStringObject())) {
          int errorCode = static_cast<int>(TRI_ObjectToInt64(errorNumValue));
          std::string const errorMessage(TRI_ObjectToString(errorMessageValue));
    
          THROW_ARANGO_EXCEPTION_MESSAGE(errorCode, errorMessage);
        }
      }
    
      // exception is no ArangoError
      std::string const details(TRI_ObjectToString(tryCatch.Exception()));
      THROW_ARANGO_EXCEPTION_MESSAGE(TRI_ERROR_QUERY_SCRIPT, details);
    }
    
    // we can't figure out what kind of error occured and throw a generic error
    THROW_ARANGO_EXCEPTION(TRI_ERROR_INTERNAL);
  }
  
  if (result.IsEmpty()) {
    THROW_ARANGO_EXCEPTION(TRI_ERROR_INTERNAL);
  }

  // if we get here, no exception has been raised
}

/// @brief checks if a V8 exception has occurred and throws an appropriate C++
/// exception from it if so
void Executor::HandleV8Error(v8::TryCatch& tryCatch,
                             v8::Handle<v8::Value>& result,
                             arangodb::basics::StringBuffer* const buffer,
                             bool duringCompile) {
  ISOLATE;

  if (tryCatch.HasCaught()) {
    // caught a V8 exception
    if (!tryCatch.CanContinue()) {
      // request was canceled
      TRI_GET_GLOBALS();
      v8g->_canceled = true;

      THROW_ARANGO_EXCEPTION(TRI_ERROR_REQUEST_CANCELED);
    }

    // request was not canceled, but some other error occurred
    // peek into the exception
    if (tryCatch.Exception()->IsObject()) {
      // cast the exception to an object

      v8::Handle<v8::Array> objValue =
          v8::Handle<v8::Array>::Cast(tryCatch.Exception());
      v8::Handle<v8::String> errorNum = TRI_V8_ASCII_STRING("errorNum");
      v8::Handle<v8::String> errorMessage = TRI_V8_ASCII_STRING("errorMessage");

      TRI_Utf8ValueNFC stacktrace(TRI_UNKNOWN_MEM_ZONE, tryCatch.StackTrace());

      if (objValue->HasOwnProperty(errorNum) &&
          objValue->HasOwnProperty(errorMessage)) {
        v8::Handle<v8::Value> errorNumValue = objValue->Get(errorNum);
        v8::Handle<v8::Value> errorMessageValue = objValue->Get(errorMessage);

        // found something that looks like an ArangoError
        if ((errorNumValue->IsNumber() || errorNumValue->IsNumberObject()) &&
            (errorMessageValue->IsString() ||
             errorMessageValue->IsStringObject())) {
          int errorCode = static_cast<int>(TRI_ObjectToInt64(errorNumValue));
          std::string errorMessage(TRI_ObjectToString(errorMessageValue));

          if (*stacktrace && stacktrace.length() > 0) {
            errorMessage += "\nstacktrace of offending AQL function: ";
            errorMessage += *stacktrace;
          }

          THROW_ARANGO_EXCEPTION_MESSAGE(errorCode, errorMessage);
        }
      }

      // exception is no ArangoError
      std::string details(TRI_ObjectToString(tryCatch.Exception()));

      if (buffer) {
        std::string script(buffer->c_str(), buffer->length());
        LOG(ERR) << details << " " << script;
        details += "\nSee log for more details";
      }
      if (*stacktrace && stacktrace.length() > 0) {
        details += "\nstacktrace of offending AQL function: ";
        details += *stacktrace;
      }

      THROW_ARANGO_EXCEPTION_MESSAGE(TRI_ERROR_QUERY_SCRIPT, details);
    }

    std::string msg("unknown error in scripting");
    if (duringCompile) {
      msg += " (during compilation)";
    }
    if (buffer) {
      std::string script(buffer->c_str(), buffer->length());
      LOG(ERR) << msg << " " << script;
      msg += " See log for details";
    }
    // we can't figure out what kind of error occurred and throw a generic error
    THROW_ARANGO_EXCEPTION_MESSAGE(TRI_ERROR_INTERNAL, msg);
  }

  if (result.IsEmpty()) {
    std::string msg("unknown error in scripting");
    if (duringCompile) {
      msg += " (during compilation)";
    }
    if (buffer) {
      std::string script(buffer->c_str(), buffer->length());
      LOG(ERR) << msg << " " << script;
      msg += " See log for details";
    }

    THROW_ARANGO_EXCEPTION_MESSAGE(TRI_ERROR_INTERNAL, msg);
  }

  // if we get here, no exception has been raised
}