ios/third_party/webkit/BUILD.gn

# Copyright 2019 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/gclient_args.gni")
import("//build/config/ios/ios_sdk.gni")
import("//build/config/zip.gni")

# Using a locally-built WebKit is only supported for Debug simulator builds.
_build_custom_webkit = checkout_ios_webkit && is_debug && use_ios_simulator

group("webkit") {
  if (_build_custom_webkit) {
    deps = [ ":bundle_webkit_ios_frameworks" ]
  }

  public_configs = [ ":_webkit_ios_config" ]
}

if (_build_custom_webkit) {
  # WebKit is built from source using xcodebuild (invoked via the
  # build_webkit.py wrapper script).  The WebKit build places its output in a
  # sub-directory named "Debug-iphonesimulator" for debug iOS builds and
  # "Release" for release macOS builds.
  _webkit_ios_out_base_dir = "$target_out_dir/iOS"
  _webkit_mac_out_base_dir = "$target_out_dir/macOS"

  _webkit_ios_xcodebuild_out_dir_name = "Debug-iphonesimulator"
  _webkit_mac_xcodebuild_out_dir_name = "Release"

  _webkit_ios_out_product_dir =
      "$_webkit_ios_out_base_dir/$_webkit_ios_xcodebuild_out_dir_name"
  _webkit_mac_out_product_dir =
      "$_webkit_mac_out_base_dir/$_webkit_mac_xcodebuild_out_dir_name"

  template("compile_webkit") {
    action(target_name) {
      visibility = [
        ":bundle_webkit_ios_frameworks",
        ":copy_webkit_mac_minibrowser",
        ":webkit",
      ]

      script = "build_webkit.py"

      inputs = [
        # Because it's difficult to list every webkit source file as an input
        # here, use the ChangeLog files as a proxy to determine whether or not
        # source files have changed.
        # TODO(crbug.com/934252): This will not pick up local edits to source
        # files, so find a way to properly rebuild when those change.
        "src/Tools/ChangeLog",
        "src/ChangeLog",
        "src/Source/WebKit/ChangeLog",
        "src/Source/JavaScriptCore/ChangeLog",
        "src/Source/WebKitLegacy/ChangeLog",
        "src/Source/WebKitLegacy/ios/ChangeLog",
        "src/Source/WebKitLegacy/mac/ChangeLog",
        "src/Source/bmalloc/ChangeLog",
        "src/Source/WebCore/ChangeLog",
        "src/Source/WTF/ChangeLog",
        "src/Source/ThirdParty/ChangeLog",
        "src/WebKitLibraries/ChangeLog",
      ]

      outputs = invoker.outputs

      args = invoker.args

      # TODO(crbug.com/934252): "-j 4" restricts xcodebuild to four simultaneous
      # jobs. This is intended to prevent overloading the machine, because ninja
      # will already be spawning a large number of jobs in parallel with
      # xcodebuild, but it causes the webkit build to run very slowly. Find a way
      # to increase the parallelism here.
      args += [
        "-j",
        "4",
        "-quiet",
      ]
    }
  }

  compile_webkit("compile_webkit_ios_frameworks") {
    outputs = [
      # The frameworks themselves include many resource files, but as a first
      # step, use just the binaries.
      "$_webkit_ios_out_product_dir/JavaScriptCore.framework",
      "$_webkit_ios_out_product_dir/JavaScriptCore.framework/JavaScriptCore",
      "$_webkit_ios_out_product_dir/WebCore.framework",
      "$_webkit_ios_out_product_dir/WebCore.framework/WebCore",
      "$_webkit_ios_out_product_dir/WebKit.framework",
      "$_webkit_ios_out_product_dir/WebKit.framework/WebKit",
      "$_webkit_ios_out_product_dir/WebKitLegacy.framework",
      "$_webkit_ios_out_product_dir/WebKitLegacy.framework/WebKitLegacy",
      "$_webkit_ios_out_product_dir/com.apple.WebKit.Networking.xpc",
      "$_webkit_ios_out_product_dir/com.apple.WebKit.Networking.xpc/com.apple.WebKit.Networking.Development",
      "$_webkit_ios_out_product_dir/com.apple.WebKit.Plugin.64.xpc",
      "$_webkit_ios_out_product_dir/com.apple.WebKit.Plugin.64.xpc/com.apple.WebKit.Plugin.64.Development",
      "$_webkit_ios_out_product_dir/com.apple.WebKit.WebContent.Development.xpc",
      "$_webkit_ios_out_product_dir/com.apple.WebKit.WebContent.Development.xpc/com.apple.WebKit.WebContent.Development.Development",
      "$_webkit_ios_out_product_dir/com.apple.WebKit.WebContent.xpc",
      "$_webkit_ios_out_product_dir/com.apple.WebKit.WebContent.xpc/com.apple.WebKit.WebContent.Development",
    ]
    args = [
      "--ios-simulator",
      "--debug",
      "--output_dir",
      rebase_path("$_webkit_ios_out_base_dir"),
    ]
  }

  compile_webkit("compile_webkit_mac_minibrowser") {
    outputs = [ "$_webkit_mac_out_product_dir" ]
    args = [
      "--asan",
      "--output_dir",
      rebase_path("$_webkit_mac_out_base_dir"),
    ]
  }

  bundle_data("bundle_webkit_ios_frameworks") {
    public_deps = [ ":compile_webkit_ios_frameworks" ]

    sources = [
      "$_webkit_ios_out_product_dir/JavaScriptCore.framework",
      "$_webkit_ios_out_product_dir/WebCore.framework",
      "$_webkit_ios_out_product_dir/WebKit.framework",
      "$_webkit_ios_out_product_dir/WebKitLegacy.framework",
      "$_webkit_ios_out_product_dir/com.apple.WebKit.Networking.xpc",
      "$_webkit_ios_out_product_dir/com.apple.WebKit.Plugin.64.xpc",
      "$_webkit_ios_out_product_dir/com.apple.WebKit.WebContent.Development.xpc",
      "$_webkit_ios_out_product_dir/com.apple.WebKit.WebContent.xpc",
    ]
    outputs =
        [ "{{bundle_contents_dir}}/WebKitFrameworks/{{source_file_part}}" ]
  }

  action("copy_webkit_mac_minibrowser") {
    script = "copy_webkit_for_clusterfuzz.py"

    sources = [
      "$_webkit_mac_out_product_dir",
      "run-clusterfuzz.sh",
    ]
    outputs = [ "$root_out_dir/WebKitMacOS" ]

    args = [
      "--output",
      rebase_path(outputs[0], root_build_dir),
      "--webkit_build",
      rebase_path(sources[0], root_build_dir),
      "--clusterfuzz_script",
      rebase_path(sources[1], root_build_dir),
    ]

    public_deps = [ ":compile_webkit_mac_minibrowser" ]
  }
}

config("_webkit_ios_config") {
  if (_build_custom_webkit) {
    # From the ld documentation: "Directories specified with -F are searched in
    # the order they appear on the command line and before the default search
    # path."
    framework_dirs = [ "$target_out_dir/$_webkit_ios_xcodebuild_out_dir_name" ]
  }

  frameworks = [ "WebKit.framework" ]
}