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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "ProcessUtils.h"
#include "mozilla/Preferences.h"
#include "mozilla/GeckoArgs.h"
#include "mozilla/dom/RemoteType.h"
#include "mozilla/ipc/GeckoChildProcessHost.h"
#include "nsPrintfCString.h"
#include "XPCSelfHostedShmem.h"
namespace mozilla {
namespace ipc {
SharedPreferenceSerializer::SharedPreferenceSerializer() {
MOZ_COUNT_CTOR(SharedPreferenceSerializer);
}
SharedPreferenceSerializer::~SharedPreferenceSerializer() {
MOZ_COUNT_DTOR(SharedPreferenceSerializer);
}
SharedPreferenceSerializer::SharedPreferenceSerializer(
SharedPreferenceSerializer&& aOther)
: mPrefMapHandle(std::move(aOther.mPrefMapHandle)),
mPrefsHandle(std::move(aOther.mPrefsHandle)) {
MOZ_COUNT_CTOR(SharedPreferenceSerializer);
}
bool SharedPreferenceSerializer::SerializeToSharedMemory(
const GeckoProcessType aDestinationProcessType,
const nsACString& aDestinationRemoteType) {
mPrefMapHandle = Preferences::EnsureSnapshot();
bool destIsWebContent =
aDestinationProcessType == GeckoProcessType_Content &&
(StringBeginsWith(aDestinationRemoteType, WEB_REMOTE_TYPE) ||
StringBeginsWith(aDestinationRemoteType, PREALLOC_REMOTE_TYPE));
// Serialize the early prefs.
nsAutoCStringN<1024> prefs;
Preferences::SerializePreferences(prefs, destIsWebContent);
auto prefsLength = prefs.Length();
// Set up the shared memory.
auto handle = shared_memory::Create(prefsLength);
if (!handle) {
NS_ERROR("failed to create shared memory in the parent");
return false;
}
auto mapping = handle.Map();
if (!mapping) {
NS_ERROR("failed to map shared memory in the parent");
return false;
}
// Copy the serialized prefs into the shared memory.
memcpy(mapping.DataAs<char>(), prefs.get(), prefsLength);
mPrefsHandle = std::move(handle).ToReadOnly();
return true;
}
void SharedPreferenceSerializer::AddSharedPrefCmdLineArgs(
mozilla::ipc::GeckoChildProcessHost& procHost,
geckoargs::ChildProcessArgs& aExtraOpts) const {
auto prefsHandle = GetPrefsHandle().Clone();
MOZ_RELEASE_ASSERT(prefsHandle, "failed to clone prefs handle");
auto prefMapHandle = GetPrefMapHandle().Clone();
MOZ_RELEASE_ASSERT(prefMapHandle, "failed to clone pref map handle");
// Pass the handles via command line flags.
geckoargs::sPrefsHandle.Put(std::move(prefsHandle), aExtraOpts);
geckoargs::sPrefMapHandle.Put(std::move(prefMapHandle), aExtraOpts);
}
SharedPreferenceDeserializer::SharedPreferenceDeserializer() {
MOZ_COUNT_CTOR(SharedPreferenceDeserializer);
}
SharedPreferenceDeserializer::~SharedPreferenceDeserializer() {
MOZ_COUNT_DTOR(SharedPreferenceDeserializer);
}
bool SharedPreferenceDeserializer::DeserializeFromSharedMemory(
ReadOnlySharedMemoryHandle&& aPrefsHandle,
ReadOnlySharedMemoryHandle&& aPrefMapHandle) {
if (!aPrefsHandle || !aPrefMapHandle) {
return false;
}
mPrefMapHandle = std::move(aPrefMapHandle);
// Init the shared-memory base preference mapping first, so that only changed
// preferences wind up in heap memory.
Preferences::InitSnapshot(mPrefMapHandle);
// Set up early prefs from the shared memory.
mShmem = aPrefsHandle.Map();
if (!mShmem) {
NS_ERROR("failed to map shared memory in the child");
return false;
}
Preferences::DeserializePreferences(mShmem.DataAs<char>(), mShmem.Size());
return true;
}
void ExportSharedJSInit(mozilla::ipc::GeckoChildProcessHost& procHost,
geckoargs::ChildProcessArgs& aExtraOpts) {
auto& shmem = xpc::SelfHostedShmem::GetSingleton();
auto handle = shmem.Handle().Clone();
// If the file is not found or the content is empty, then we would start the
// content process without this optimization.
if (!handle) {
NS_ERROR("Can't use SelfHosted shared memory handle.");
return;
}
// command line: -jsInitHandle handle
geckoargs::sJsInitHandle.Put(std::move(handle), aExtraOpts);
}
bool ImportSharedJSInit(ReadOnlySharedMemoryHandle&& aJsInitHandle) {
// This is an optimization, and as such we can safely recover if the command
// line argument are not provided.
if (!aJsInitHandle) {
return true;
}
// Initialize the shared memory with the file handle and size of the content
// of the self-hosted Xdr.
auto& shmem = xpc::SelfHostedShmem::GetSingleton();
if (!shmem.InitFromChild(std::move(aJsInitHandle))) {
NS_ERROR("failed to open shared memory in the child");
return false;
}
return true;
}
} // namespace ipc
} // namespace mozilla
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