/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 "singa/core/common.h"

#include "singa/core/device.h"

namespace singa {

void* Block::mutable_data() {
  if (data_ == nullptr && size_ > 0) {
    data_ = device_->Malloc((int)size_);
  }
  initialized_ = true;
  return static_cast<char*>(data_) + offset_;
}

const void* Block::data() const {
  CHECK(initialized_) << "Must initialize data before reading it";
  return static_cast<char*>(data_) + offset_;
}

void Block::free_data() {
  if (data_) {
    device_->Free(data_);
    data_ = nullptr;
    initialized_ = false;
  }
}

}  // namespace singa