# Copyright (C) 2017 The Android Open Source Project
#
# 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.

import("//gn/standalone/sanitizers/sanitizers.gni")

# Link dependencies for sanitizers for executables.
group("deps") {
  visibility = [ "*" ]
  if (using_sanitizer) {
    public_configs = [ ":sanitizers_ldflags" ]
    if (is_android && sanitizer_lib != "" && !sanitizer_lib_dir_is_static) {
      deps = [
        ":copy_sanitizer_lib",
      ]
    }
  }
}

if (is_android && sanitizer_lib != "" && !sanitizer_lib_dir_is_static) {
  copy("copy_sanitizer_lib") {
    sources = [
      "${sanitizer_lib_dir}/lib${sanitizer_lib}.so",
    ]
    outputs = [
      "${root_out_dir}/sanitizer_libs/lib${sanitizer_lib}.so",
    ]
  }
}

config("sanitizers_cflags") {
  cflags = []
  defines = []
  if (using_sanitizer) {
    blacklist_path_ = rebase_path("blacklist.txt", root_build_dir)
    cflags += [
      "-fno-omit-frame-pointer",
      "-fsanitize-blacklist=$blacklist_path_",
    ]
  }

  if (is_asan) {
    cflags += [ "-fsanitize=address" ]
    defines += [ "ADDRESS_SANITIZER" ]
  }
  if (is_lsan) {
    cflags += [ "-fsanitize=leak" ]
    defines += [ "LEAK_SANITIZER" ]
  }
  if (is_tsan) {
    cflags += [ "-fsanitize=thread" ]
    defines += [
      "THREAD_SANITIZER",
      "DYNAMIC_ANNOTATIONS_EXTERNAL_IMPL=1",
    ]
  }
  if (is_msan) {
    cflags += [
      "-fsanitize=memory",
      "-fsanitize-memory-track-origins=2",
    ]
    defines += [ "MEMORY_SANITIZER" ]
  }
  if (is_ubsan) {
    cflags += [
      "-fsanitize=bounds",
      "-fsanitize=float-divide-by-zero",
      "-fsanitize=integer-divide-by-zero",
      "-fsanitize=null",
      "-fsanitize=object-size",
      "-fsanitize=return",
      "-fsanitize=returns-nonnull-attribute",
      "-fsanitize=shift-exponent",
      "-fsanitize=signed-integer-overflow",
      "-fsanitize=unreachable",
      "-fsanitize=vla-bound",
    ]
    defines += [ "UNDEFINED_SANITIZER" ]
  }
  if (is_fuzzer) {
    # FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION is also defined by oss-fuzz,
    # so using the same name.
    defines += [ "FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION" ]
    cflags += [ "-fsanitize=fuzzer-no-link" ]
    if (is_asan) {
      cflags += [
        "-mllvm",
        "-asan-use-private-alias",
      ]
    }
  }
}

config("sanitizer_options_link_helper") {
  if (is_mac) {
    ldflags = [ "-Wl,-U,_sanitizer_options_link_helper" ]
  }
}

config("sanitizers_ldflags") {
  visibility = [ ":deps" ]
  ldflags = []
  if (is_asan) {
    ldflags += [ "-fsanitize=address" ]
  }
  if (is_lsan) {
    # This is not a copy/paste mistake. The LSan runtime library has
    # moved into asan. So in order to make LSan work one has to build
    # .cc files with -fsanitize=leak but link with -fsanitize=address.
    ldflags += [ "-fsanitize=address" ]
  }
  if (is_tsan) {
    ldflags += [ "-fsanitize=thread" ]
  }
  if (is_msan) {
    ldflags += [ "-fsanitize=memory" ]
  }
  if (is_ubsan) {
    ldflags += [ "-fsanitize=undefined" ]
  }
  configs = [ ":sanitizer_options_link_helper" ]
}