# Copyright 2023 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")

declare_args() {
  # This should be set to the path of the llvm compiler-rt/builtins directory.
  dir_pw_third_party_llvm_builtins = ""

  # Points to a pw_source_set that enumerates builtins specific to
  # the current toolchain.
  pw_third_party_llvm_builtins_TARGET_BUILTINS = ""

  # List of files to be excluded from the builtins repo.
  pw_third_party_llvm_builtins_ignore_list = []
}

config("no-warnings") {
  cflags = [
    "-Wno-double-promotion",
    "-Wno-undef",
    "-Wno-unused-parameter",
    "-Wno-strict-prototypes",
  ]
}

# Source files that are common between ARMv6M and ARMv7M.
generic_sources = [
  "absvdi2.c",
  "absvsi2.c",
  "absvti2.c",
  "adddf3.c",
  "addvdi3.c",
  "addvsi3.c",
  "addvti3.c",
  "ashldi3.c",
  "ashlti3.c",
  "ashrdi3.c",
  "ashrti3.c",
  "clzti2.c",
  "cmpdi2.c",
  "cmpti2.c",
  "comparedf2.c",
  "ctzdi2.c",
  "ctzsi2.c",
  "ctzti2.c",
  "divdc3.c",
  "divdf3.c",
  "divdi3.c",
  "divmoddi4.c",
  "divmodti4.c",
  "divsc3.c",
  "divsf3.c",
  "divti3.c",
  "extendhfsf2.c",
  "extendsfdf2.c",
  "ffsdi2.c",
  "ffssi2.c",
  "ffsti2.c",
  "fixdfdi.c",
  "fixdfsi.c",
  "fixdfti.c",
  "fixsfdi.c",
  "fixsfsi.c",
  "fixsfti.c",
  "fixunsdfdi.c",
  "fixunsdfsi.c",
  "fixunsdfti.c",
  "fixunssfdi.c",
  "fixunssfsi.c",
  "fixunssfti.c",
  "floatdidf.c",
  "floatdisf.c",
  "floatsidf.c",
  "floatsisf.c",
  "floattidf.c",
  "floattisf.c",
  "floatundidf.c",
  "floatundisf.c",
  "floatunsidf.c",
  "floatunsisf.c",
  "floatuntidf.c",
  "floatuntisf.c",
  "int_util.c",
  "lshrdi3.c",
  "lshrti3.c",
  "moddi3.c",
  "modti3.c",
  "muldc3.c",
  "muldf3.c",
  "muldi3.c",
  "mulodi4.c",
  "mulosi4.c",
  "muloti4.c",
  "mulsc3.c",
  "mulsf3.c",
  "multi3.c",
  "mulvdi3.c",
  "mulvsi3.c",
  "mulvti3.c",
  "negdf2.c",
  "negdi2.c",
  "negsf2.c",
  "negti2.c",
  "negvdi2.c",
  "negvsi2.c",
  "negvti2.c",
  "os_version_check.c",
  "paritydi2.c",
  "paritysi2.c",
  "parityti2.c",
  "popcountdi2.c",
  "popcountsi2.c",
  "popcountti2.c",
  "powidf2.c",
  "powisf2.c",
  "subdf3.c",
  "subsf3.c",
  "subvdi3.c",
  "subvsi3.c",
  "subvti3.c",
  "trampoline_setup.c",
  "truncdfhf2.c",
  "truncdfsf2.c",
  "truncsfhf2.c",
  "ucmpdi2.c",
  "ucmpti2.c",
  "udivdi3.c",
  "udivmoddi4.c",
  "udivmodti4.c",
  "udivti3.c",
  "umoddi3.c",
  "umodti3.c",
]

generic_tf_sources = [
  "addtf3.c",
  "comparetf2.c",
  "divtc3.c",
  "divtf3.c",
  "extenddftf2.c",
  "extendhftf2.c",
  "extendsftf2.c",
  "fixtfdi.c",
  "fixtfsi.c",
  "fixtfti.c",
  "fixunstfdi.c",
  "fixunstfsi.c",
  "fixunstfti.c",
  "floatditf.c",
  "floatsitf.c",
  "floattitf.c",
  "floatunditf.c",
  "floatunsitf.c",
  "floatuntitf.c",
  "multc3.c",
  "multf3.c",
  "powitf2.c",
  "subtf3.c",
  "trunctfdf2.c",
  "trunctfhf2.c",
  "trunctfsf2.c",
]

armv7m_only_sources = [
  "addsf3.c",
  ## Assembly equivalent version of these following sources are
  ## provided by arm_or_thumb2_base_sources
  #  "bswapdi2.c",
  #  "bswapsi2.c",
  #  "clzdi2.c",
  #  "clzsi2.c",
  #  "comparesf2.c",
  #  "divmodsi4.c",
  #  "divsi3.c",
  #  "fp_mode.c",
  #  "modsi3.c",
  #  "udivmodsi4.c",
  #  "udivsi3.c",
  #  "umodsi3.c",
]

armv6m_only_sources = [
  "bswapdi2.c",
  "bswapsi2.c",
  "clzdi2.c",
  "clzsi2.c",
  "divmodsi4.c",
  "fp_mode.c",
  "modsi3.c",
  "udivmodsi4.c",
  "umodsi3.c",

  ## Assembly equivalent version of these following sources are
  ## provided by thumb1_base_sources
  # "addsf3.c",
  # "divsi3.c",
  # "udivsi3.c",
  # "comparesf2.c",
]

arm_or_thumb2_base_sources = [
  "arm/bswapdi2.S",
  "arm/bswapsi2.S",
  "arm/clzdi2.S",
  "arm/clzsi2.S",
  "arm/comparesf2.S",
  "arm/divmodsi4.S",
  "arm/divsi3.S",
  "arm/fp_mode.c",
  "arm/modsi3.S",
  "arm/udivmodsi4.S",
  "arm/udivsi3.S",
  "arm/umodsi3.S",
]

arm_sync_sources = [
  "arm/sync_fetch_and_add_4.S",
  "arm/sync_fetch_and_add_8.S",
  "arm/sync_fetch_and_and_4.S",
  "arm/sync_fetch_and_and_8.S",
  "arm/sync_fetch_and_max_4.S",
  "arm/sync_fetch_and_max_8.S",
  "arm/sync_fetch_and_min_4.S",
  "arm/sync_fetch_and_min_8.S",
  "arm/sync_fetch_and_nand_4.S",
  "arm/sync_fetch_and_nand_8.S",
  "arm/sync_fetch_and_or_4.S",
  "arm/sync_fetch_and_or_8.S",
  "arm/sync_fetch_and_sub_4.S",
  "arm/sync_fetch_and_sub_8.S",
  "arm/sync_fetch_and_umax_4.S",
  "arm/sync_fetch_and_umax_8.S",
  "arm/sync_fetch_and_umin_4.S",
  "arm/sync_fetch_and_umin_8.S",
  "arm/sync_fetch_and_xor_4.S",
  "arm/sync_fetch_and_xor_8.S",
]

# builtin support for Thumb-only targets with very limited Thumb2 technology,
# such as v6-m and v8-m.baseline
thumb1_base_sources = [
  "arm/addsf3.S",
  "arm/comparesf2.S",
  "arm/divsi3.S",
  "arm/udivsi3.S",
]

arm_eabi_sources = [
  "arm/aeabi_cdcmp.S",
  "arm/aeabi_cdcmpeq_check_nan.c",
  "arm/aeabi_cfcmp.S",
  "arm/aeabi_cfcmpeq_check_nan.c",
  "arm/aeabi_dcmp.S",
  "arm/aeabi_div0.c",
  "arm/aeabi_drsub.c",
  "arm/aeabi_fcmp.S",
  "arm/aeabi_frsub.c",
  "arm/aeabi_idivmod.S",
  "arm/aeabi_ldivmod.S",
  "arm/aeabi_memcmp.S",
  "arm/aeabi_memcpy.S",
  "arm/aeabi_memmove.S",
  "arm/aeabi_memset.S",
  "arm/aeabi_uidivmod.S",
  "arm/aeabi_uldivmod.S",
]

arm_thumb1_jt_sources = [
  "arm/switch16.S",
  "arm/switch32.S",
  "arm/switch8.S",
  "arm/switchu8.S",
]

arm_thumb1_icache_sources = [ "arm/sync_synchronize.S" ]

# thumb1 calling into Arm to cover support
arm_thumb1_sources = arm_thumb1_jt_sources + arm_thumb1_icache_sources

arm_sources = arm_or_thumb2_base_sources + arm_sync_sources + arm_eabi_sources +
              arm_thumb1_sources + generic_sources + armv7m_only_sources +
              generic_tf_sources

thumb1_sources = thumb1_base_sources + arm_eabi_sources + generic_sources +
                 armv6m_only_sources + generic_tf_sources

armv6m_sources = thumb1_sources
armv7m_sources = arm_sources

# ARM builtins for ARMv7-M.
# Because this is unconditionally added to all clang-based ARM toolchains,
# this library should be a no-op if `dir_pw_third_party_llvm_builtins` is
# not configured.
pw_source_set("arm_builtins_armv7m") {
  configs = [ ":no-warnings" ]
  remove_configs = [ "$dir_pw_build:extra_strict_warnings" ]

  sources = []

  arm_files = armv7m_sources

  if (dir_pw_third_party_llvm_builtins != "") {
    effective_arm_files =
        filter_exclude(arm_files, pw_third_party_llvm_builtins_ignore_list)
    foreach(file, effective_arm_files) {
      sources += [ "$dir_pw_third_party_llvm_builtins/$file" ]
    }
  } else {
    not_needed([ "arm_files" ])
  }
}

# ARM builtins for ARMv6-M.
# Because this is unconditionally added to all clang-based ARM toolchains,
# this library should be a no-op if `dir_pw_third_party_llvm_builtins` is
# not configured.
pw_source_set("arm_builtins_armv6m") {
  configs = [ ":no-warnings" ]
  remove_configs = [ "$dir_pw_build:extra_strict_warnings" ]

  sources = []

  arm_files = armv6m_sources

  if (dir_pw_third_party_llvm_builtins != "") {
    effective_arm_files =
        filter_exclude(arm_files, pw_third_party_llvm_builtins_ignore_list)
    foreach(file, effective_arm_files) {
      sources += [ "$dir_pw_third_party_llvm_builtins/$file" ]
    }
  } else {
    not_needed([ "arm_files" ])
  }
}

# Because this is unconditionally added to all clang-based ARM toolchains,
# this library should be a no-op if `dir_pw_third_party_llvm_builtins` is
# not configured.
pw_static_library("llvm_builtins") {
  add_global_link_deps = false
  configs = [ ":no-warnings" ]
  remove_configs = [ "$dir_pw_build:extra_strict_warnings" ]
  sources = []

  # Architecture specific pw_source_set created from LLVM builtins
  # source files. e.g. arm_builtins_armv6m.
  # If this property is not set, no architecture specific builtin
  # functions will be included from the repo.
  if (pw_third_party_llvm_builtins_TARGET_BUILTINS != "") {
    deps = [ pw_third_party_llvm_builtins_TARGET_BUILTINS ]
  }
}