samples/device/device_static_loader.c

/*
 * Copyright 2022 Google LLC
 *
 * 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.
 */

// Static library loading in IREE.

#include "iree/hal/local/loaders/static_library_loader.h"
#include "iree/hal/local/sync_device.h"
#include "iree/modules/hal/module.h"
#include "samples/device/device.h"
#include "samples/util/model_api.h"

// A function to create the HAL device from the different backend targets.
// The HAL device is returned based on the implementation, and it must be
// released by the caller.
iree_status_t create_sample_device(iree_allocator_t host_allocator,
                                               iree_hal_device_t** out_device) {
  iree_status_t status = iree_ok_status();

  // Set paramters for the device created in the next step.
  iree_hal_sync_device_params_t params;
  iree_hal_sync_device_params_initialize(&params);

  // Load the statically embedded library
  const iree_hal_executable_library_header_t** static_library = library_query(
      IREE_HAL_EXECUTABLE_LIBRARY_LATEST_VERSION, /*reserved=*/NULL);
  const iree_hal_executable_library_header_t** libraries[1] = {static_library};

  iree_hal_executable_loader_t* library_loader = NULL;
  if (iree_status_is_ok(status)) {
    status = iree_hal_static_library_loader_create(
        IREE_ARRAYSIZE(libraries), libraries,
        iree_hal_executable_import_provider_null(), host_allocator,
        &library_loader);
  }

  // Use the default host allocator for buffer allocations.
  iree_string_view_t identifier = iree_make_cstring_view("sync");
  iree_hal_allocator_t* device_allocator = NULL;
  if (iree_status_is_ok(status)) {
    status = iree_hal_allocator_create_heap(identifier, host_allocator,
                                            host_allocator, &device_allocator);
  }

  // Create the device and release the executor and loader afterwards.
  if (iree_status_is_ok(status)) {
    status = iree_hal_sync_device_create(
        identifier, &params, /*loader_count=*/1, &library_loader,
        device_allocator, host_allocator, out_device);
  }

  iree_hal_allocator_release(device_allocator);
  iree_hal_executable_loader_release(library_loader);
  return status;
}