v8_context_snapshot/v8_context_snapshot.gni

# Copyright 2017 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

# Targets in ths file are to take a V8 context snapshot on build time.
# Created V8 context snapshot is used in
# third_party/blink/renderer/bindings/core/v8/v8_context_snapshot.{cc|h}.
# to speedup creating a V8 context and setting up around it.

import("//build/config/cast.gni")
import("//build/config/chromeos/ui_mode.gni")
import("//build/config/v8_target_cpu.gni")
import("//v8/gni/v8.gni")

declare_args() {
  # TODO(crbug.com/764576): Enable the feature on more environments.
  # Disable in mac and win cross builds since building Blink twice is slow.
  use_v8_context_snapshot =
      !is_chromeos && !is_android && !is_castos && !is_fuchsia &&
      # Android may build for both 64 bit and 32bit. When this happens, the
      # v8_target_cpu will not equal the target_cpu (for example,
      # v8_target_cpu == "arm" but target_os == "arm64").
      (v8_target_cpu == target_cpu || target_os == "android") &&
      !(host_toolchain == default_toolchain && is_msan) &&
      !(is_win && host_os != "win") && !(is_mac && host_os != "mac")

  # We use a different filename for arm64 macOS builds so that the arm64 and
  # x64 snapshots can live side-by-side in a universal macOS app.
  if (is_mac) {
    if (v8_target_cpu == "x64") {
      v8_context_snapshot_filename = "v8_context_snapshot.x86_64.bin"
    } else if (v8_target_cpu == "arm64") {
      v8_context_snapshot_filename = "v8_context_snapshot.arm64.bin"
    }
  } else if (target_os == "android") {
    if (v8_current_cpu == "arm" || v8_current_cpu == "x86" ||
        v8_current_cpu == "mipsel") {
      v8_context_snapshot_filename = "v8_context_snapshot_32.bin"
    } else {
      v8_context_snapshot_filename = "v8_context_snapshot_64.bin"
    }
  } else {
    v8_context_snapshot_filename = "v8_context_snapshot.bin"
  }
}

# We cannot use V8 context snapshot, if V8 doesn't use snapshot files.
if (use_v8_context_snapshot && !v8_use_external_startup_data) {
  use_v8_context_snapshot = false
}