xref: /build/templates/rust/rust_cxx.gni

# Copyright (c) 2023 Huawei Device Co., Ltd.
# 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.

template("rust_cxx") {
  assert(defined(invoker.sources),
         "Must specify the Rust file to use as input.")

  action_foreach(target_name) {
    sources = invoker.sources

    output_h = "{{source_gen_dir}}/{{source_file_part}}.h"
    output_cc = "{{source_gen_dir}}/{{source_file_part}}.cc"

    if (defined(invoker.subsystem_name) && defined(invoker.part_name)) {
      subsystem_name = invoker.subsystem_name
      part_name = invoker.part_name
    } else if (defined(invoker.part_name)) {
      part_name = invoker.part_name
      _part_subsystem_info_file =
          "$root_build_dir/build_configs/parts_info/part_subsystem.json"
      _arguments = [
        "--part-name",
        part_name,
        "--part-subsystem-info-file",
        rebase_path(_part_subsystem_info_file, root_build_dir),
      ]
      get_subsystem_script = "//build/templates/common/get_subsystem_name.py"
      subsystem_name =
          exec_script(get_subsystem_script, _arguments, "trim string")
    } else if (defined(invoker.subsystem_name)) {
      subsystem_name = invoker.subsystem_name
      part_name = subsystem_name
    } else {
      subsystem_name = "build"
      part_name = "build_framework"
    }

    cxxbridge_target =
        "//third_party/rust/crates/cxx/gen/cmd:cxxbridge($host_toolchain)"

    cxxbridge_out_dir = get_label_info(cxxbridge_target, "root_out_dir")
    cxxbridge_executable = rebase_path(
            "${cxxbridge_out_dir}/${subsystem_name}/${part_name}/cxxbridge")

    script = "//build/templates/rust/rust_cxxbridge.py"
    inputs = [
      cxxbridge_executable,
      script,
    ]
    deps = [ cxxbridge_target ]
    outputs = [
      output_h,
      output_cc,
    ]

    args = [
      "--cxxbridge",
      rebase_path(cxxbridge_executable, root_build_dir),
      "--cc",
      output_cc,
      "--header",
      output_h,
      "--",
      "{{source}}",
    ]
  }
}