75 lines
2.6 KiB
C++
75 lines
2.6 KiB
C++
/* Copyright 2020 The TensorFlow Authors. All Rights Reserved.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
==============================================================================*/
|
|
#include "tensorflow/python/framework/py_context_manager.h"
|
|
|
|
#include <map>
|
|
|
|
#include "tensorflow/core/platform/logging.h"
|
|
|
|
namespace tensorflow {
|
|
|
|
bool PyContextManager::Enter(PyObject* py_context_manager) {
|
|
if (context_manager_) {
|
|
PyErr_SetString(
|
|
PyExc_ValueError,
|
|
"tensorflow::PyContextManager::Enter must be called at most once.");
|
|
}
|
|
if (!py_context_manager) return false;
|
|
context_manager_.reset(py_context_manager);
|
|
static char _enter[] = "__enter__";
|
|
var_.reset(PyObject_CallMethod(context_manager_.get(), _enter, nullptr));
|
|
return var_ != nullptr;
|
|
}
|
|
|
|
PyContextManager::~PyContextManager() {
|
|
if (var_) {
|
|
static char _exit[] = "__exit__";
|
|
static char _ooo[] = "OOO";
|
|
if (PyErr_Occurred()) {
|
|
PyObject *type, *value, *traceback;
|
|
PyErr_Fetch(&type, &value, &traceback);
|
|
value = value ? value : Py_None;
|
|
traceback = traceback ? traceback : Py_None;
|
|
Safe_PyObjectPtr result(PyObject_CallMethod(
|
|
context_manager_.get(), _exit, _ooo, type, value, traceback));
|
|
if (result) {
|
|
if (PyObject_IsTrue(result.get())) {
|
|
PyErr_SetString(
|
|
PyExc_ValueError,
|
|
"tensorflow::PyContextManager::Enter does not support "
|
|
"context managers that suppress exceptions.");
|
|
} else {
|
|
PyErr_Restore(type, value, traceback);
|
|
}
|
|
}
|
|
} else {
|
|
PyObject* result = PyObject_CallMethod(context_manager_.get(), _exit,
|
|
_ooo, Py_None, Py_None, Py_None);
|
|
if (result) {
|
|
Py_DECREF(result);
|
|
} else {
|
|
LOG(ERROR)
|
|
<< "A context manager wrapped by tensorflow::PyContextManager "
|
|
"raised a new exception from its __new__ method. This behavior "
|
|
"is not supported by PyContextManager, and the exception is "
|
|
"being suppressed.";
|
|
PyErr_Clear();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
} // namespace tensorflow
|