blob: dd2304fa10502db5037affe906525d7c24b16a2a [file] [log] [blame]
// 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/browser/browsing_instance.h"
#include "base/command_line.h"
#include "base/logging.h"
#include "content/browser/site_instance_impl.h"
#include "content/public/browser/browser_context.h"
#include "content/public/browser/browser_or_resource_context.h"
#include "content/public/browser/content_browser_client.h"
#include "content/public/browser/site_isolation_policy.h"
#include "content/public/common/content_features.h"
#include "content/public/common/content_switches.h"
#include "content/public/common/url_constants.h"
namespace content {
namespace {
const char* const kDefaultInstanceSiteURL = "http://unisolated.invalid";
} // namespace
// Start the BrowsingInstance ID counter from 1 to avoid a conflict with the
// invalid BrowsingInstanceId value, which is 0 in its underlying IdType32.
int BrowsingInstance::next_browsing_instance_id_ = 1;
BrowsingInstance::BrowsingInstance(BrowserContext* browser_context)
: isolation_context_(
default_process_(nullptr) {
void BrowsingInstance::RenderProcessHostDestroyed(RenderProcessHost* host) {
DCHECK_EQ(default_process_, host);
// Only clear the default process if the RenderProcessHost object goes away,
// not if the renderer process goes away while the RenderProcessHost remains.
default_process_ = nullptr;
BrowserContext* BrowsingInstance::GetBrowserContext() const {
return isolation_context_.browser_or_resource_context().ToBrowserContext();
void BrowsingInstance::SetDefaultProcess(RenderProcessHost* default_process) {
default_process_ = default_process;
bool BrowsingInstance::IsDefaultSiteInstance(
const SiteInstanceImpl* site_instance) const {
return site_instance != nullptr &&
site_instance == default_site_instance_.get();
bool BrowsingInstance::HasSiteInstance(const GURL& url) {
std::string site = SiteInstanceImpl::GetSiteForURL(isolation_context_, url)
return site_instance_map_.find(site) != site_instance_map_.end();
scoped_refptr<SiteInstanceImpl> BrowsingInstance::GetSiteInstanceForURL(
const GURL& url,
bool allow_default_instance) {
scoped_refptr<SiteInstanceImpl> site_instance =
GetSiteInstanceForURLHelper(url, allow_default_instance);
if (site_instance)
return site_instance;
// No current SiteInstance for this site, so let's create one.
scoped_refptr<SiteInstanceImpl> instance = new SiteInstanceImpl(this);
// Set the site of this new SiteInstance, which will register it with us,
// unless this URL should leave the SiteInstance's site unassigned.
if (SiteInstance::ShouldAssignSiteForURL(url))
return instance;
void BrowsingInstance::GetSiteAndLockForURL(const GURL& url,
bool allow_default_instance,
GURL* site_url,
GURL* lock_url) {
scoped_refptr<SiteInstanceImpl> site_instance =
GetSiteInstanceForURLHelper(url, allow_default_instance);
if (site_instance) {
*site_url = site_instance->GetSiteURL();
*lock_url = site_instance->lock_url();
*site_url = SiteInstanceImpl::GetSiteForURL(isolation_context_, url);
*lock_url =
SiteInstanceImpl::DetermineProcessLockURL(isolation_context_, url);
scoped_refptr<SiteInstanceImpl> BrowsingInstance::GetSiteInstanceForURLHelper(
const GURL& url,
bool allow_default_instance) {
std::string site = SiteInstanceImpl::GetSiteForURL(isolation_context_, url)
auto i = site_instance_map_.find(site);
if (i != site_instance_map_.end())
return i->second;
// Check to see if we can use the default SiteInstance for sites that don't
// need to be isolated in their own process. The default instance allows us to
// have multiple unisolated sites share a process. We don't use the default
// instance when kProcessSharingWithStrictSiteInstances is enabled because in
// that case we want each site to have their own SiteInstance object and logic
// elsewhere ensures that those SiteInstances share a process.
if (allow_default_instance &&
features::kProcessSharingWithStrictSiteInstances) &&
url)) {
if (!default_site_instance_) {
default_site_instance_ = new SiteInstanceImpl(this);
return default_site_instance_;
return nullptr;
void BrowsingInstance::RegisterSiteInstance(SiteInstanceImpl* site_instance) {
DCHECK(site_instance->browsing_instance_.get() == this);
// Explicitly prevent the |default_site_instance_| from being added since
// the map is only supposed to contain instances that map to a single site.
if (site_instance == default_site_instance_.get())
std::string site = site_instance->GetSiteURL().possibly_invalid_spec();
// Only register if we don't have a SiteInstance for this site already.
// It's possible to have two SiteInstances point to the same site if two
// tabs are navigated there at the same time. (We don't call SetSite or
// register them until DidNavigate.) If there is a previously existing
// SiteInstance for this site, we just won't register the new one.
auto i = site_instance_map_.find(site);
if (i == site_instance_map_.end()) {
// Not previously registered, so register it.
site_instance_map_[site] = site_instance;
void BrowsingInstance::UnregisterSiteInstance(SiteInstanceImpl* site_instance) {
DCHECK(site_instance->browsing_instance_.get() == this);
std::string site = site_instance->GetSiteURL().possibly_invalid_spec();
// Only unregister the SiteInstance if it is the same one that is registered
// for the site. (It might have been an unregistered SiteInstance. See the
// comments in RegisterSiteInstance.)
auto i = site_instance_map_.find(site);
if (i != site_instance_map_.end() && i->second == site_instance) {
// Matches, so erase it.
// static
BrowsingInstanceId BrowsingInstance::NextBrowsingInstanceId() {
return BrowsingInstanceId::FromUnsafeValue(next_browsing_instance_id_);
BrowsingInstance::~BrowsingInstance() {
// We should only be deleted when all of the SiteInstances that refer to
// us are gone.
DCHECK_EQ(0u, active_contents_count_);
if (default_process_)
} // namespace content