Transfer v8 snapshot files as file descriptors to child processes on Posix

content/app/content_main_runner.cc

 // Copyright (c) 2012 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.
 
 #include "content/public/app/content_main_runner.h"
 
 #include <stdlib.h>
 
 #include "base/allocator/allocator_extension.h"
 #include "base/at_exit.h"
@@ skipping 35 matching lines @@
 #include "ipc/ipc_switches.h"
 #include "media/base/media.h"
 #include "sandbox/win/src/sandbox_types.h"
 #include "ui/base/ui_base_paths.h"
 #include "ui/base/ui_base_switches.h"
 
 #ifdef V8_USE_EXTERNAL_STARTUP_DATA
 #include "gin/public/isolate_holder.h"
 #endif
 
-#if defined(OS_ANDROID)
-#include "content/public/common/content_descriptors.h"
-#endif
-
 #if defined(USE_TCMALLOC)
 #include "third_party/tcmalloc/chromium/src/gperftools/malloc_extension.h"
 #if defined(TYPE_PROFILING)
 #include "base/allocator/type_profiler.h"
 #include "base/allocator/type_profiler_tcmalloc.h"
 #endif
 #endif
 
 #if !defined(OS_IOS)
 #include "content/app/mojo/mojo_init.h"
@@ skipping 21 matching lines @@
 #endif  // !OS_IOS
 #endif  // OS_WIN
 
 #if defined(OS_POSIX)
 #include <signal.h>
 
 #include "base/posix/global_descriptors.h"
 #include "content/public/common/content_descriptors.h"
 
 #if !defined(OS_MACOSX)
+#include "content/public/common/content_descriptors.h"
 #include "content/public/common/zygote_fork_delegate_linux.h"
 #endif
 #if !defined(OS_MACOSX) && !defined(OS_ANDROID)
 #include "content/zygote/zygote_main.h"
 #endif
 
 #endif  // OS_POSIX
 
 #if !defined(OS_MACOSX) && defined(USE_TCMALLOC)
 extern "C" {
@@ skipping 401 matching lines @@
     SetupSignalHandlers();
 
     base::GlobalDescriptors* g_fds = base::GlobalDescriptors::GetInstance();
     g_fds->Set(kPrimaryIPCChannel,
                kPrimaryIPCChannel + base::GlobalDescriptors::kBaseDescriptor);
 #endif  // !OS_ANDROID && !OS_IOS
 
 #if defined(OS_LINUX) || defined(OS_OPENBSD)
     g_fds->Set(kCrashDumpSignal,
                kCrashDumpSignal + base::GlobalDescriptors::kBaseDescriptor);
-#endif
+#if defined(V8_USE_EXTERNAL_STARTUP_DATA)
+    g_fds->Set(
+        kV8NativesDataDescriptor,
+        kV8NativesDataDescriptor + base::GlobalDescriptors::kBaseDescriptor);
+    g_fds->Set(
+        kV8SnapshotDataDescriptor,
+        kV8SnapshotDataDescriptor + base::GlobalDescriptors::kBaseDescriptor);
+#endif  // V8_USE_EXTERNAL_STARTUP_DATA
+#endif  // OS_LINUX || OS_OPENBSD
+
 
 #endif  // !OS_WIN
 
     is_initialized_ = true;
     delegate_ = params.delegate;
 
     // The exit manager is in charge of calling the dtors of singleton objects.
     // On Android, AtExitManager is set up when library is loaded.
     // On iOS, it's set up in main(), which can't call directly through to here.
     // A consequence of this is that you can't use the ctor/dtor-based
@@ skipping 149 matching lines @@
     int icudata_fd = base::GlobalDescriptors::GetInstance()->MaybeGet(
         kAndroidICUDataDescriptor);
     if (icudata_fd != -1) {
       auto icudata_region = base::GlobalDescriptors::GetInstance()->GetRegion(
           kAndroidICUDataDescriptor);
       CHECK(base::i18n::InitializeICUWithFileDescriptor(icudata_fd,
                                                         icudata_region));
     } else {
       CHECK(base::i18n::InitializeICU());
     }
+#else
+    CHECK(base::i18n::InitializeICU());
+#endif  // OS_ANDROID
 
 #if defined(V8_USE_EXTERNAL_STARTUP_DATA)
-    int v8_natives_fd = base::GlobalDescriptors::GetInstance()->MaybeGet(
-        kV8NativesDataDescriptor);
-    int v8_snapshot_fd = base::GlobalDescriptors::GetInstance()->MaybeGet(
-        kV8SnapshotDataDescriptor);
-    if (v8_natives_fd != -1 && v8_snapshot_fd != -1) {
-      auto v8_natives_region =
-          base::GlobalDescriptors::GetInstance()->GetRegion(
-              kV8NativesDataDescriptor);
-      auto v8_snapshot_region =
-          base::GlobalDescriptors::GetInstance()->GetRegion(
-              kV8SnapshotDataDescriptor);
+#if defined(OS_POSIX) && !defined(OS_MACOSX)
+    if (process_type.empty() || process_type == switches::kZygoteProcess) {
+      // Load snapshot from file for browser or zygote process.
+      CHECK(gin::IsolateHolder::LoadV8Snapshot());
+    } else {
+      base::GlobalDescriptors* g_fds = base::GlobalDescriptors::GetInstance();
+      int v8_natives_fd = g_fds->Get(kV8NativesDataDescriptor);
+      int v8_snapshot_fd = g_fds->Get(kV8SnapshotDataDescriptor);
+      auto v8_natives_region = g_fds->GetRegion(kV8NativesDataDescriptor);
+      auto v8_snapshot_region = g_fds->GetRegion(kV8SnapshotDataDescriptor);
       CHECK(gin::IsolateHolder::LoadV8SnapshotFd(
           v8_natives_fd, v8_natives_region.offset, v8_natives_region.size,
           v8_snapshot_fd, v8_snapshot_region.offset, v8_snapshot_region.size));
-    } else {
-      CHECK(gin::IsolateHolder::LoadV8Snapshot());
     }
-#endif // V8_USE_EXTERNAL_STARTUP_DATA
-
 #else
-    CHECK(base::i18n::InitializeICU());
-#if defined(V8_USE_EXTERNAL_STARTUP_DATA)
     CHECK(gin::IsolateHolder::LoadV8Snapshot());
+#endif  // OS_POSIX
 #endif  // V8_USE_EXTERNAL_STARTUP_DATA
-#endif  // OS_ANDROID
 
     if (delegate_)
       delegate_->PreSandboxStartup();
 
     if (!process_type.empty())
       CommonSubprocessInit(process_type);
 
 #if defined(OS_WIN)
     CHECK(InitializeSandbox(params.sandbox_info));
 #elif defined(OS_MACOSX) && !defined(OS_IOS)
@@ skipping 93 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(ContentMainRunnerImpl);
 };
 
 // static
 ContentMainRunner* ContentMainRunner::Create() {
   return new ContentMainRunnerImpl();
 }
 
 }  // namespace content