BUILD.gn

# Copyright 2015 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

import("//build/config/sanitizers/sanitizers.gni")

prebuilt_available =
    is_msan && (msan_track_origins == 0 || msan_track_origins == 2)

group("deps") {
  if (use_prebuilt_instrumented_libraries) {
    assert(prebuilt_available,
           "Prebuilt instrumented libraries are only available when " +
               "is_msan = true and msan_track_origins = {0, 2}")
    deps = [
      ":prebuilt",
    ]
  }
}

if (prebuilt_available) {
  group("prebuilt") {
    visibility = [ ":deps" ]
    public_configs = [ ":prebuilt_link_helper" ]
    deps = [
      ":extract_prebuilt_instrumented_libraries",
    ]
  }

  if (is_msan) {
    sanitizer_type = "msan"
    if (msan_track_origins == 0) {
      archive_prefix = "msan-no-origins"
    } else if (msan_track_origins == 2) {
      archive_prefix = "msan-chained-origins"
    }
  }

  # TODO(GYP): scripts/download_binaries.py uses GYP_DEFINES to decide whether
  # to download the archives extracted here.
  # Note: This requires a clobber whenever Ubuntu version changes.
  action("extract_prebuilt_instrumented_libraries") {
    visibility = [ ":prebuilt" ]
    script = "scripts/unpack_binaries.py"
    depfile = "$target_out_dir/$archive_prefix.d"
    args = [
      archive_prefix,
      rebase_path("binaries"),
      rebase_path(root_build_dir + "/instrumented_libraries_prebuilt"),
      rebase_path(target_out_dir, root_build_dir),
    ]
    outputs = [
      "$target_out_dir/$archive_prefix.txt",
    ]
  }

  config("prebuilt_link_helper") {
    visibility = [ ":prebuilt" ]
    ldflags = [
      # Add a relative RPATH entry to Chromium binaries. This puts instrumented
      # DSOs before system-installed versions in library search path.
      "-Wl,-R,\$ORIGIN/instrumented_libraries_prebuilt/$sanitizer_type/lib",
      "-Wl,-z,origin",
    ]
  }
}
# TODO(GYP): Support building instrumented libraries from source.