Port 'external startup data' flag from gyp to gn.

BUILD.gn

 # Copyright 2014 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.
 
 # TODO(jochen): These will need to be user-settable to support standalone V8
 # builds.
 v8_compress_startup_data = "off"
 v8_deprecation_warnings = false
 v8_enable_disassembler = false
 v8_enable_gdbjit = false
@@ skipping 200 matching lines @@
   ]
 
   outputs = [
     "$target_gen_dir/libraries.cc"
   ]
 
   if (v8_enable_i18n_support) {
     sources += [ "src/i18n.js" ]
   }
 
-  args =
-    rebase_path(outputs, root_build_dir) +
-    [ "CORE", v8_compress_startup_data ] +
-    rebase_path(sources, root_build_dir)
+  args = [
+    rebase_path("$target_gen_dir/libraries.cc", root_build_dir),
+    "CORE",
+    v8_compress_startup_data
+  ] + rebase_path(sources, root_build_dir)
+
+  if (v8_use_external_startup_data) {
+    outputs += [ "$target_gen_dir/libraries.bin" ]
+    args += [
+      "--startup_blob",
+      rebase_path("$target_gen_dir/libraries.bin", root_build_dir)
+    ]
+  }
 }
 
 action("js2c_experimental") {
   visibility = ":*"  # Only targets in this file can depend on this.
 
   script = "tools/js2c.py"
 
   # The script depends on this other script, this rule causes a rebuild if it
   # changes.
   source_prereqs = [ "tools/jsmin.py" ]
 
   sources = [
     "src/macros.py",
     "src/symbol.js",
     "src/proxy.js",
     "src/collection.js",
     "src/collection-iterator.js",
     "src/generator.js",
     "src/array-iterator.js",
     "src/harmony-string.js",
     "src/harmony-array.js",
     "src/harmony-math.js",
   ]
 
   outputs = [
     "$target_gen_dir/experimental-libraries.cc"
   ]
 
-  args =
-    rebase_path(outputs, root_build_dir) +
-    [ "EXPERIMENTAL", v8_compress_startup_data ] +
-    rebase_path(sources, root_build_dir)
+  args = [
+    rebase_path("$target_gen_dir/experimental-libraries.cc", root_build_dir),
+    "EXPERIMENTAL",
+    v8_compress_startup_data
+  ] + rebase_path(sources, root_build_dir)
+
+  if (v8_use_external_startup_data) {
+    outputs += [ "$target_gen_dir/libraries_experimental.bin" ]
+    args += [
+      "--startup_blob",
+      rebase_path("$target_gen_dir/libraries_experimental.bin", root_build_dir)
+    ]
+  }
+}
+
+action("natives_blob") {
+  visibility = ":*"  # Only targets in this file can depend on this.
+
+  deps = [
+    ":js2c",
+    ":js2c_experimental"
+  ]
+
+  sources = [
+    "$target_gen_dir/libraries.bin",
+    "$target_gen_dir/libraries_experimental.bin"
+  ]
+
+  outputs = [
+    "$root_gen_dir/natives_blob.bin"
+  ]
+
+  script = "tools/concatenate-files.py"
+
+  args = rebase_path(sources + outputs, root_build_dir)
 }
 
 action("postmortem-metadata") {
   visibility = ":*"  # Only targets in this file can depend on this.
 
   script = "tools/gen-postmortem-metadata.py"
 
   sources = [
     "src/objects.h",
     "src/objects-inl.h",
@@ skipping 17 matching lines @@
 
   outputs = [
     "$target_gen_dir/snapshot.cc"
   ]
 
   args = [
     "./" + rebase_path(get_label_info(":mksnapshot($host_toolchain)",
                                       "root_out_dir") + "/mksnapshot",
                        root_build_dir),
     "--log-snapshot-positions",
-    "--logfile", rebase_path("$target_gen_dir/snapshot.log", root_build_dir)
+    "--logfile", rebase_path("$target_gen_dir/snapshot.log", root_build_dir),
+    rebase_path("$target_gen_dir/snapshot.cc", root_build_dir)
   ]
 
   if (v8_random_seed != "0") {
     args += [ "--random-seed", v8_random_seed ]
   }
 
-  args += rebase_path(outputs, root_build_dir)
+  if (v8_use_external_startup_data) {
+    outputs += [ "$root_gen_dir/snapshot_blob.bin" ]
+    args += [
+      "--startup_blob",
+      rebase_path("$root_gen_dir/snapshot_blob.bin", root_build_dir)
+    ]
+  }
 }
 
 
 ###############################################################################
 # Source Sets (aka static libraries)
 #
 
 source_set("v8_nosnapshot") {
   visibility = ":*"  # Only targets in this file can depend on this.
 
@@ skipping 34 matching lines @@
     "$target_gen_dir/trig-table.cc",
     "$target_gen_dir/snapshot.cc",
     "src/snapshot-common.cc",
   ]
 
   configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [ "//build/config/compiler:no_chromium_code" ]
   configs += [ ":internal_config", ":features", ":toolchain" ]
 }
 
+source_set("v8_external_snapshot") {
+  visibility = ":*"  # Only targets in this file can depend on this.
+
+  deps = [
+    ":js2c",
+    ":js2c_experimental",
+    ":generate_trig_table",
+    ":run_mksnapshot",
+    ":v8_base",
+    ":natives_blob",
+  ]
+
+  sources = [
+    "$target_gen_dir/trig-table.cc",
+    "src/natives-external.cc",
+    "src/snapshot-external.cc",
+  ]
+
+  configs -= [ "//build/config/compiler:chromium_code" ]
+  configs += [ "//build/config/compiler:no_chromium_code" ]
+  configs += [ ":internal_config", ":features", ":toolchain" ]
+}
+
 source_set("v8_base") {
   visibility = ":*"  # Only targets in this file can depend on this.
 
   sources = [
     "src/accessors.cc",
     "src/accessors.h",
     "src/allocation.cc",
     "src/allocation.h",
     "src/allocation-site-scopes.cc",
     "src/allocation-site-scopes.h",
@@ skipping 651 matching lines @@
 # Public targets
 #
 
 if (component_mode == "shared_library") {
 
 component("v8") {
   sources = [
     "src/v8dll-main.cc",
   ]
 
-  if (v8_use_snapshot) {
+  if (v8_use_external_startup_data) {
+    deps = [
+      ":v8_base",
+      ":v8_external_snapshot",
+    ]
+  } else if (v8_use_snapshot) {
     deps = [
       ":v8_base",
       ":v8_snapshot",
     ]
   } else {
     deps = [
       ":v8_base",
       ":v8_nosnapshot",
     ]
   }
 
   configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [ "//build/config/compiler:no_chromium_code" ]
   configs += [ ":internal_config", ":features", ":toolchain" ]
 
   direct_dependent_configs = [ ":external_config" ]
 
   if (is_android && current_toolchain != host_toolchain) {
     libs += [ "log" ]
   }
 }
 
 } else {
 
 group("v8") {
-  if (v8_use_snapshot) {
+  if (v8_use_external_startup_data) {
+    deps = [
+      ":v8_base",
+      ":v8_external_snapshot",
+    ]
+  } else if (v8_use_snapshot) {
     deps = [
       ":v8_base",
       ":v8_snapshot",
     ]
   } else {
     deps = [
       ":v8_base",
       ":v8_nosnapshot",
     ]
   }
 
   direct_dependent_configs = [ ":external_config" ]
 }
 
 }