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 380 matching lines @@
     // needs to be enabled.
     const char* profiling = getenv(tracked_objects::kAlternateProfilerTime);
     if (profiling &&
         (atoi(profiling) == tracked_objects::TIME_SOURCE_TYPE_TCMALLOC)) {
       tracked_objects::SetAlternateTimeSource(
           MallocExtension::GetBytesAllocatedOnCurrentThread,
           tracked_objects::TIME_SOURCE_TYPE_TCMALLOC);
     }
 #endif  // !OS_MACOSX && USE_TCMALLOC
 
+#if !defined(OS_IOS)
+    base::GlobalDescriptors* g_fds = base::GlobalDescriptors::GetInstance();
+#endif
+
     // On Android,
     // - setlocale() is not supported.
     // - We do not override the signal handlers so that we can get
     //   stack trace when crashing.
     // - The ipc_fd is passed through the Java service.
     // Thus, these are all disabled.
 #if !defined(OS_ANDROID) && !defined(OS_IOS)
     // Set C library locale to make sure CommandLine can parse argument values
     // in correct encoding.
     setlocale(LC_ALL, "");
 
     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
+#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 139 matching lines @@
 
 #if defined(USE_NSS)
     crypto::EarlySetupForNSSInit();
 #endif
 
     ui::RegisterPathProvider();
     RegisterPathProvider();
     RegisterContentSchemes(true);
 
 #if defined(OS_ANDROID)
-    int icudata_fd = base::GlobalDescriptors::GetInstance()->MaybeGet(
-        kAndroidICUDataDescriptor);
+    int icudata_fd = g_fds->MaybeGet(kAndroidICUDataDescriptor);
     if (icudata_fd != -1) {
-      auto icudata_region = base::GlobalDescriptors::GetInstance()->GetRegion(
-          kAndroidICUDataDescriptor);
+      auto icudata_region = g_fds->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 defined(OS_POSIX) && !defined(OS_MACOSX)
+#if !defined(OS_ANDROID)
+    // kV8NativesDataDescriptor and kV8SnapshotDataDescriptor are shared with
+    // child processes. On Android they are set in
+    // ChildProcessService::InternalInitChildProcess, otherwise set them here.
+    if (!process_type.empty() && process_type != switches::kZygoteProcess) {
+      g_fds->Set(
+          kV8NativesDataDescriptor,
+          kV8NativesDataDescriptor + base::GlobalDescriptors::kBaseDescriptor);
+      g_fds->Set(
+          kV8SnapshotDataDescriptor,
+          kV8SnapshotDataDescriptor + base::GlobalDescriptors::kBaseDescriptor);
+    }
+#endif  // !OS_ANDROID
+    int v8_natives_fd = g_fds->MaybeGet(kV8NativesDataDescriptor);
+    int v8_snapshot_fd = g_fds->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);
+      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 && !OS_MACOSX
 #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