chore: import upstream snapshot with attribution

paddle/phi/backends/cpu/cpu_context.cc

@@ -0,0 +1,82 @@
+//   Copyright (c) 2022 PaddlePaddle 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 "paddle/phi/backends/cpu/cpu_context.h"
+
+#include "paddle/phi/common/place.h"
+#include "paddle/phi/core/enforce.h"
+
+// NOTE: The paddle framework should add WITH_EIGEN option to support compile
+// without eigen.
+#include "paddle/phi/core/device_context.h"
+#include "unsupported/Eigen/CXX11/Tensor"
+
+namespace phi {
+
+struct CPUContext::Impl {
+  Impl() : place_(CPUPlace()) {}
+
+  explicit Impl(const Place& place) : place_(place) {}
+
+  ~Impl() {
+    if (owned_) {
+      delete eigen_device_;
+    }
+  }
+
+  void Init() {
+    owned_ = true;
+    eigen_device_ = new Eigen::DefaultDevice();
+  }
+
+  Eigen::DefaultDevice* GetEigenDevice() const {
+    PADDLE_ENFORCE_NE(
+        eigen_device_,
+        nullptr,
+        common::errors::Unavailable("the cpu eigen_device is nullptr."));
+    return eigen_device_;
+  }
+
+  bool owned_{false};
+  Eigen::DefaultDevice* eigen_device_{nullptr};
+  Place place_;
+};
+
+CPUContext::CPUContext()
+    : DeviceContext(), impl_(std::make_unique<CPUContext::Impl>()) {
+  impl_->Init();
+}
+
+CPUContext::CPUContext(const Place& place)
+    : DeviceContext(), impl_(std::make_unique<CPUContext::Impl>(place)) {
+  impl_->Init();
+}
+
+CPUContext::~CPUContext() = default;
+
+CPUContext::CPUContext(CPUContext&&) = default;  // NOLINT
+
+CPUContext& CPUContext::operator=(CPUContext&&) = default;  // NOLINT
+
+Eigen::DefaultDevice* CPUContext::eigen_device() const {
+  return impl_->GetEigenDevice();
+}
+
+const Place& CPUContext::GetPlace() const { return impl_->place_; }
+
+void CPUContext::SetEigenDevice(Eigen::DefaultDevice* device) {
+  impl_->eigen_device_ = device;
+}
+
+}  // namespace phi