1/* Copyright 2020 The TensorFlow Authors. All Rights Reserved.
2
3Licensed under the Apache License, Version 2.0 (the "License");
4you may not use this file except in compliance with the License.
5You may obtain a copy of the License at
6
7 http://www.apache.org/licenses/LICENSE-2.0
8
9Unless required by applicable law or agreed to in writing, software
10distributed under the License is distributed on an "AS IS" BASIS,
11WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12See the License for the specific language governing permissions and
13limitations under the License.
14==============================================================================*/
15
16#include "tensorflow/core/platform/enable_tf2_utils.h"
17
18#include <atomic>
19
20#include "tensorflow/core/util/env_var.h"
21
22namespace tensorflow {
23
24enum Enablement : uint8 { kFalse = 0, kTrue = 1, undefined = 2 };
25
26// If this flag is set, we will use it as a signal to decide on whether to
27// use the MLIR based TF-XLA bridge.
28static std::atomic<Enablement> tf2_enabled{undefined};
29
30// Determine whether or not the user has explicitly asked for tf2 execution.
31// Will be used to determine whether to use the MLIR based bridge.
32void set_tf2_execution(bool enabled) {
33 tf2_enabled = (enabled) ? Enablement::kTrue : Enablement::kFalse;
34}
35
36bool tf2_execution_enabled() {
37 if (tf2_enabled == Enablement::undefined) {
38 static bool tf2_behavior_env_enabled = [] {
39 string tf2_env;
40 TF_CHECK_OK(ReadStringFromEnvVar("TF2_BEHAVIOR", "0", &tf2_env));
41 return tf2_env != "0";
42 }();
43 tf2_enabled =
44 (tf2_behavior_env_enabled) ? Enablement::kTrue : Enablement::kFalse;
45 }
46 return tf2_enabled;
47}
48
49} // namespace tensorflow
50