# Copyright 2020 The Pigweed Authors
#
# 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
#
#     https://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.

import("//build_overrides/pigweed.gni")

import("$dir_pw_build/error.gni")
import("$dir_pw_build/target_types.gni")
import("$dir_pw_docgen/docs.gni")
import("freertos.gni")

# This file defines a GN source_set for an external installation of freertos.
# To use, checkout the freertos source into a directory, then set the build arg
# dir_pw_third_party_freertos to point to that directory. The freertos library
# will be available in GN at "$dir_pw_third_party/freertos".
if (dir_pw_third_party_freertos == "") {
  group("freertos") {
  }
} else if (pw_third_party_freertos_PORT == "") {
  pw_error("freertos") {
    message_lines = [
      "FreeRTOS is being used by $current_toolchain, but pw_third_party_freertos_PORT is not set.",
      "If this toolchain is intentionally using FreeRTOS, ensure your toolchain configuration for this target sets pw_third_party_freertos_PORT.",
    ]
  }
} else if (pw_third_party_freertos_CONFIG == "") {
  pw_error("freertos") {
    message_lines = [
      "FreeRTOS is being used by $current_toolchain, but pw_third_party_freertos_CONFIG is not set.",
      "If this toolchain is intentionally using FreeRTOS, ensure your toolchain configuration for this target sets pw_third_party_freertos_CONFIG.",
    ]
  }
} else {
  config("disable_warnings") {
    cflags = [
      "-Wno-unused-parameter",
      "-Wno-cast-qual",
    ]
    visibility = [ ":*" ]
  }

  config("public_includes") {
    include_dirs = [ "$dir_pw_third_party_freertos/include" ]
    visibility = [ ":*" ]
  }

  pw_source_set("freertos") {
    public_configs = [ ":public_includes" ]
    allow_circular_includes_from = [
      pw_third_party_freertos_PORT,
      ":freertos_tasks",
    ]
    public_deps = [
      pw_third_party_freertos_CONFIG,
      pw_third_party_freertos_PORT,
    ]
    public = [
      "$dir_pw_third_party_freertos/include/FreeRTOS.h",
      "$dir_pw_third_party_freertos/include/StackMacros.h",
      "$dir_pw_third_party_freertos/include/croutine.h",
      "$dir_pw_third_party_freertos/include/deprecated_definitions.h",
      "$dir_pw_third_party_freertos/include/event_groups.h",
      "$dir_pw_third_party_freertos/include/list.h",
      "$dir_pw_third_party_freertos/include/message_buffer.h",
      "$dir_pw_third_party_freertos/include/mpu_prototypes.h",
      "$dir_pw_third_party_freertos/include/mpu_wrappers.h",
      "$dir_pw_third_party_freertos/include/portable.h",
      "$dir_pw_third_party_freertos/include/projdefs.h",
      "$dir_pw_third_party_freertos/include/queue.h",
      "$dir_pw_third_party_freertos/include/semphr.h",
      "$dir_pw_third_party_freertos/include/stack_macros.h",
      "$dir_pw_third_party_freertos/include/stream_buffer.h",
      "$dir_pw_third_party_freertos/include/task.h",
      "$dir_pw_third_party_freertos/include/timers.h",
    ]
    configs = [ ":disable_warnings" ]
    sources = [
      "$dir_pw_third_party_freertos/croutine.c",
      "$dir_pw_third_party_freertos/event_groups.c",
      "$dir_pw_third_party_freertos/list.c",
      "$dir_pw_third_party_freertos/queue.c",
      "$dir_pw_third_party_freertos/stream_buffer.c",
      "$dir_pw_third_party_freertos/timers.c",
    ]
    deps = [ ":freertos_tasks" ]
  }

  # In order to link against internal kernel data structures through the use of
  # extern "C", statics can be optionally disabled for the tasks.c source file
  # to enable use of things like pw_thread_freertos/util.h's ForEachThread.
  config("disable_statics") {
    cflags = [
      "-Dstatic=",
      "-DPW_THIRD_PARTY_FREERTOS_NO_STATICS=1",
    ]
    visibility = [ ":*" ]
  }

  pw_source_set("freertos_tasks") {
    public_configs = [ ":public_includes" ]
    configs = [ ":disable_warnings" ]
    if (pw_third_party_freertos_DISABLE_TASKS_STATICS) {
      configs += [ ":disable_statics" ]
    }
    sources = [ "$dir_pw_third_party_freertos/tasks.c" ]
    deps = [
      pw_third_party_freertos_CONFIG,
      pw_third_party_freertos_PORT,
    ]
  }

  # ARM CM4F port of FreeRTOS.
  config("arm_cm4f_includes") {
    include_dirs = [ "$dir_pw_third_party_freertos/portable/GCC/ARM_CM4F" ]
    visibility = [ ":arm_cm4f" ]
  }

  pw_source_set("arm_cm4f") {
    public_configs = [
      ":arm_cm4f_includes",
      ":public_includes",
    ]
    public_deps = [ pw_third_party_freertos_CONFIG ]
    public =
        [ "$dir_pw_third_party_freertos/portable/GCC/ARM_CM4F/portmacro.h" ]
    sources = [ "$dir_pw_third_party_freertos/portable/GCC/ARM_CM4F/port.c" ]
    configs = [ ":disable_warnings" ]
  }
}

config("public_include_path") {
  include_dirs = [ "public" ]
  visibility = [ ":*" ]
}

pw_source_set("config_assert") {
  public_configs = [ ":public_include_path" ]
  public_deps = [ dir_pw_assert ]
  public = [ "public/pw_third_party/freertos/config_assert.h" ]
}

pw_doc_group("docs") {
  sources = [ "docs.rst" ]
}