/* Copyright 2016 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/core/common_runtime/memory_types.h"

#include "tensorflow/core/framework/tensor.h"
#include "tensorflow/core/graph/testlib.h"
#include "tensorflow/core/lib/core/status_test_util.h"
#include "tensorflow/core/platform/test.h"

namespace tensorflow {

TEST(MemoryTypeChecker, Int32OK) {
  Graph* g = new Graph(OpRegistry::Global());
  Tensor v(DT_INT32, {});
  v.scalar<int32>().setZero();
  auto in0 = test::graph::Constant(g, v);
  auto in1 = test::graph::Constant(g, v);
  test::graph::Add(g, in0, in1);
  TF_EXPECT_OK(ValidateMemoryTypes(DEVICE_CPU, g));
#if GOOGLE_CUDA
  // There is a kernel for adding two int32s on host memory.
  TF_EXPECT_OK(ValidateMemoryTypes(DEVICE_GPU, g));
#endif  // GOOGLE_CUDA
  delete g;
}

TEST(MemoryTypeChecker, Int32NotOk) {
  Graph* g = new Graph(OpRegistry::Global());
  Tensor v(DT_INT32, {});
  v.scalar<int32>().setZero();
  auto x = test::graph::Constant(g, v);
  test::graph::Cast(g, x, DT_FLOAT);
  TF_EXPECT_OK(ValidateMemoryTypes(DEVICE_CPU, g));
#if GOOGLE_CUDA
  // There is no kernel for casting int32/host memory to float/device
  // memory.
  EXPECT_TRUE(errors::IsInternal(ValidateMemoryTypes(DEVICE_GPU, g)));

  // But we can insert _HostSend/_HostRecv to ensure the invariant.
  TF_EXPECT_OK(EnsureMemoryTypes(DEVICE_GPU, "/gpu:0", g));
  TF_EXPECT_OK(ValidateMemoryTypes(DEVICE_GPU, g));
#endif  // GOOGLE_CUDA
  delete g;
}

TEST(MemoryTypeChecker, MemoryTypeForOutput) {
  Graph* g = new Graph(OpRegistry::Global());
  Tensor vb(DT_BOOL);
  Tensor vi(DT_INT32);
  Tensor vf(DT_FLOAT);
  auto pred = test::graph::Constant(g, vb);
  auto sf = test::graph::Switch(g, test::graph::Constant(g, vf), pred);
  MemoryType memory_type;

  TF_EXPECT_OK(MemoryTypeForOutput(DEVICE_CPU, g, sf, 0, &memory_type));
  // float Switch's output on CPU doesn't have HOST_MEMORY constraint.
  EXPECT_EQ(memory_type, DEVICE_MEMORY);
#if GOOGLE_CUDA
  auto si = test::graph::Switch(g, test::graph::Constant(g, vi), pred);
  TF_EXPECT_OK(MemoryTypeForOutput(DEVICE_GPU, g, si, 0, &memory_type));
  // int Switch's output on GPU has HOST_MEMORY constraint.
  EXPECT_EQ(memory_type, HOST_MEMORY);
#endif  // GOOGLE_CUDA
  delete g;
}

}  // namespace
