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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 "nsSHistory.h"
#include <algorithm>
#include "nsContentUtils.h"
#include "nsCOMArray.h"
#include "nsComponentManagerUtils.h"
#include "nsDocShell.h"
#include "nsFrameLoaderOwner.h"
#include "nsHashKeys.h"
#include "nsIContentViewer.h"
#include "nsIDocShell.h"
#include "nsDocShellLoadState.h"
#include "nsIDocShellTreeItem.h"
#include "nsILayoutHistoryState.h"
#include "nsIObserverService.h"
#include "nsISHEntry.h"
#include "nsISHistoryListener.h"
#include "nsIURI.h"
#include "nsIXULRuntime.h"
#include "nsNetUtil.h"
#include "nsTHashMap.h"
#include "nsSHEntry.h"
#include "SessionHistoryEntry.h"
#include "nsTArray.h"
#include "prsystem.h"
#include "mozilla/Attributes.h"
#include "mozilla/dom/BrowsingContextGroup.h"
#include "mozilla/dom/CanonicalBrowsingContext.h"
#include "mozilla/dom/ContentParent.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/RemoteWebProgressRequest.h"
#include "mozilla/dom/WindowGlobalParent.h"
#include "mozilla/LinkedList.h"
#include "mozilla/MathAlgorithms.h"
#include "mozilla/Preferences.h"
#include "mozilla/ProcessPriorityManager.h"
#include "mozilla/Services.h"
#include "mozilla/StaticPrefs_fission.h"
#include "mozilla/StaticPtr.h"
#include "mozilla/dom/CanonicalBrowsingContext.h"
#include "nsIWebNavigation.h"
#include "nsDocShellLoadTypes.h"
#include "base/process.h"
using namespace mozilla;
using namespace mozilla::dom;
#define PREF_SHISTORY_SIZE "browser.sessionhistory.max_entries"
#define PREF_SHISTORY_MAX_TOTAL_VIEWERS \
"browser.sessionhistory.max_total_viewers"
#define CONTENT_VIEWER_TIMEOUT_SECONDS \
"browser.sessionhistory.contentViewerTimeout"
// Observe fission.bfcacheInParent so that BFCache can be enabled/disabled when
// the pref is changed.
#define PREF_FISSION_BFCACHEINPARENT "fission.bfcacheInParent"
// Default this to time out unused content viewers after 30 minutes
#define CONTENT_VIEWER_TIMEOUT_SECONDS_DEFAULT (30 * 60)
static const char* kObservedPrefs[] = {PREF_SHISTORY_SIZE,
PREF_SHISTORY_MAX_TOTAL_VIEWERS,
PREF_FISSION_BFCACHEINPARENT, nullptr};
static int32_t gHistoryMaxSize = 50;
// List of all SHistory objects, used for content viewer cache eviction.
// When being destroyed, this helper removes everything from the list to avoid
// assertions when we leak.
struct ListHelper {
#ifdef DEBUG
~ListHelper() { mList.clear(); }
#endif // DEBUG
LinkedList<nsSHistory> mList;
};
static ListHelper gSHistoryList;
// Max viewers allowed total, across all SHistory objects - negative default
// means we will calculate how many viewers to cache based on total memory
int32_t nsSHistory::sHistoryMaxTotalViewers = -1;
// A counter that is used to be able to know the order in which
// entries were touched, so that we can evict older entries first.
static uint32_t gTouchCounter = 0;
extern mozilla::LazyLogModule gSHLog;
LazyLogModule gSHistoryLog("nsSHistory");
#define LOG(format) MOZ_LOG(gSHistoryLog, mozilla::LogLevel::Debug, format)
extern mozilla::LazyLogModule gPageCacheLog;
extern mozilla::LazyLogModule gSHIPBFCacheLog;
// This macro makes it easier to print a log message which includes a URI's
// spec. Example use:
//
// nsIURI *uri = [...];
// LOG_SPEC(("The URI is %s.", _spec), uri);
//
#define LOG_SPEC(format, uri) \
PR_BEGIN_MACRO \
if (MOZ_LOG_TEST(gSHistoryLog, LogLevel::Debug)) { \
nsAutoCString _specStr("(null)"_ns); \
if (uri) { \
_specStr = uri->GetSpecOrDefault(); \
} \
const char* _spec = _specStr.get(); \
LOG(format); \
} \
PR_END_MACRO
// This macro makes it easy to log a message including an SHEntry's URI.
// For example:
//
// nsCOMPtr<nsISHEntry> shentry = [...];
// LOG_SHENTRY_SPEC(("shentry %p has uri %s.", shentry.get(), _spec), shentry);
//
#define LOG_SHENTRY_SPEC(format, shentry) \
PR_BEGIN_MACRO \
if (MOZ_LOG_TEST(gSHistoryLog, LogLevel::Debug)) { \
nsCOMPtr<nsIURI> uri = shentry->GetURI(); \
LOG_SPEC(format, uri); \
} \
PR_END_MACRO
// Calls a F on all registered session history listeners.
template <typename F>
static void NotifyListeners(nsAutoTObserverArray<nsWeakPtr, 2>& aListeners,
F&& f) {
for (const nsWeakPtr& weakPtr : aListeners.EndLimitedRange()) {
nsCOMPtr<nsISHistoryListener> listener = do_QueryReferent(weakPtr);
if (listener) {
f(listener);
}
}
}
class MOZ_STACK_CLASS SHistoryChangeNotifier {
public:
explicit SHistoryChangeNotifier(nsSHistory* aHistory) {
// If we're already in an update, the outermost change notifier will
// update browsing context in the destructor.
if (!aHistory->HasOngoingUpdate()) {
aHistory->SetHasOngoingUpdate(true);
mSHistory = aHistory;
}
}
~SHistoryChangeNotifier() {
if (mSHistory) {
MOZ_ASSERT(mSHistory->HasOngoingUpdate());
mSHistory->SetHasOngoingUpdate(false);
RefPtr<BrowsingContext> rootBC = mSHistory->GetBrowsingContext();
if (mozilla::SessionHistoryInParent() && rootBC) {
rootBC->Canonical()->HistoryCommitIndexAndLength();
}
}
}
RefPtr<nsSHistory> mSHistory;
};
enum HistCmd { HIST_CMD_GOTOINDEX, HIST_CMD_RELOAD };
class nsSHistoryObserver final : public nsIObserver {
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIOBSERVER
nsSHistoryObserver() {}
static void PrefChanged(const char* aPref, void* aSelf);
void PrefChanged(const char* aPref);
protected:
~nsSHistoryObserver() {}
};
StaticRefPtr<nsSHistoryObserver> gObserver;
NS_IMPL_ISUPPORTS(nsSHistoryObserver, nsIObserver)
// static
void nsSHistoryObserver::PrefChanged(const char* aPref, void* aSelf) {
static_cast<nsSHistoryObserver*>(aSelf)->PrefChanged(aPref);
}
void nsSHistoryObserver::PrefChanged(const char* aPref) {
nsSHistory::UpdatePrefs();
nsSHistory::GloballyEvictContentViewers();
}
NS_IMETHODIMP
nsSHistoryObserver::Observe(nsISupports* aSubject, const char* aTopic,
const char16_t* aData) {
if (!strcmp(aTopic, "cacheservice:empty-cache") ||
!strcmp(aTopic, "memory-pressure")) {
nsSHistory::GloballyEvictAllContentViewers();
}
return NS_OK;
}
void nsSHistory::EvictContentViewerForEntry(nsISHEntry* aEntry) {
nsCOMPtr<nsIContentViewer> viewer = aEntry->GetContentViewer();
if (viewer) {
LOG_SHENTRY_SPEC(("Evicting content viewer 0x%p for "
"owning SHEntry 0x%p at %s.",
viewer.get(), aEntry, _spec),
aEntry);
// Drop the presentation state before destroying the viewer, so that
// document teardown is able to correctly persist the state.
NotifyListenersContentViewerEvicted(1);
aEntry->SetContentViewer(nullptr);
aEntry->SyncPresentationState();
viewer->Destroy();
} else if (nsCOMPtr<SessionHistoryEntry> she = do_QueryInterface(aEntry)) {
if (RefPtr<nsFrameLoader> frameLoader = she->GetFrameLoader()) {
MOZ_LOG(gSHIPBFCacheLog, LogLevel::Debug,
("nsSHistory::EvictContentViewerForEntry "
"destroying an nsFrameLoader."));
NotifyListenersContentViewerEvicted(1);
she->SetFrameLoader(nullptr);
frameLoader->Destroy();
}
}
// When dropping bfcache, we have to remove associated dynamic entries as
// well.
int32_t index = GetIndexOfEntry(aEntry);
if (index != -1) {
RemoveDynEntries(index, aEntry);
}
}
nsSHistory::nsSHistory(BrowsingContext* aRootBC)
: mRootBC(aRootBC->Id()),
mHasOngoingUpdate(false),
mIndex(-1),
mRequestedIndex(-1),
mRootDocShellID(aRootBC->GetHistoryID()) {
static bool sCalledStartup = false;
if (!sCalledStartup) {
Startup();
sCalledStartup = true;
}
// Add this new SHistory object to the list
gSHistoryList.mList.insertBack(this);
// Init mHistoryTracker on setting mRootBC so we can bind its event
// target to the tabGroup.
mHistoryTracker = mozilla::MakeUnique<HistoryTracker>(
this,
mozilla::Preferences::GetUint(CONTENT_VIEWER_TIMEOUT_SECONDS,
CONTENT_VIEWER_TIMEOUT_SECONDS_DEFAULT),
GetCurrentSerialEventTarget());
}
nsSHistory::~nsSHistory() {
// Clear mEntries explicitly here so that the destructor of the entries
// can still access nsSHistory in a reasonable way.
mEntries.Clear();
}
NS_IMPL_ADDREF(nsSHistory)
NS_IMPL_RELEASE(nsSHistory)
NS_INTERFACE_MAP_BEGIN(nsSHistory)
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsISHistory)
NS_INTERFACE_MAP_ENTRY(nsISHistory)
NS_INTERFACE_MAP_ENTRY(nsISupportsWeakReference)
NS_INTERFACE_MAP_END
// static
uint32_t nsSHistory::CalcMaxTotalViewers() {
// This value allows tweaking how fast the allowed amount of content viewers
// grows with increasing amounts of memory. Larger values mean slower growth.
#ifdef ANDROID
# define MAX_TOTAL_VIEWERS_BIAS 15.9
#else
# define MAX_TOTAL_VIEWERS_BIAS 14
#endif
// Calculate an estimate of how many ContentViewers we should cache based
// on RAM. This assumes that the average ContentViewer is 4MB (conservative)
// and caps the max at 8 ContentViewers
//
// TODO: Should we split the cache memory betw. ContentViewer caching and
// nsCacheService?
//
// RAM | ContentViewers | on Android
// -------------------------------------
// 32 Mb 0 0
// 64 Mb 1 0
// 128 Mb 2 0
// 256 Mb 3 1
// 512 Mb 5 2
// 768 Mb 6 2
// 1024 Mb 8 3
// 2048 Mb 8 5
// 3072 Mb 8 7
// 4096 Mb 8 8
uint64_t bytes = PR_GetPhysicalMemorySize();
if (bytes == 0) {
return 0;
}
// Conversion from unsigned int64_t to double doesn't work on all platforms.
// We need to truncate the value at INT64_MAX to make sure we don't
// overflow.
if (bytes > INT64_MAX) {
bytes = INT64_MAX;
}
double kBytesD = (double)(bytes >> 10);
// This is essentially the same calculation as for nsCacheService,
// except that we divide the final memory calculation by 4, since
// we assume each ContentViewer takes on average 4MB
uint32_t viewers = 0;
double x = std::log(kBytesD) / std::log(2.0) - MAX_TOTAL_VIEWERS_BIAS;
if (x > 0) {
viewers = (uint32_t)(x * x - x + 2.001); // add .001 for rounding
viewers /= 4;
}
// Cap it off at 8 max
if (viewers > 8) {
viewers = 8;
}
return viewers;
}
// static
void nsSHistory::UpdatePrefs() {
Preferences::GetInt(PREF_SHISTORY_SIZE, &gHistoryMaxSize);
if (mozilla::SessionHistoryInParent() && !mozilla::BFCacheInParent()) {
sHistoryMaxTotalViewers = 0;
return;
}
Preferences::GetInt(PREF_SHISTORY_MAX_TOTAL_VIEWERS,
&sHistoryMaxTotalViewers);
// If the pref is negative, that means we calculate how many viewers
// we think we should cache, based on total memory
if (sHistoryMaxTotalViewers < 0) {
sHistoryMaxTotalViewers = CalcMaxTotalViewers();
}
}
// static
nsresult nsSHistory::Startup() {
UpdatePrefs();
// The goal of this is to unbreak users who have inadvertently set their
// session history size to less than the default value.
int32_t defaultHistoryMaxSize =
Preferences::GetInt(PREF_SHISTORY_SIZE, 50, PrefValueKind::Default);
if (gHistoryMaxSize < defaultHistoryMaxSize) {
gHistoryMaxSize = defaultHistoryMaxSize;
}
// Allow the user to override the max total number of cached viewers,
// but keep the per SHistory cached viewer limit constant
if (!gObserver) {
gObserver = new nsSHistoryObserver();
Preferences::RegisterCallbacks(nsSHistoryObserver::PrefChanged,
kObservedPrefs, gObserver.get());
nsCOMPtr<nsIObserverService> obsSvc =
mozilla::services::GetObserverService();
if (obsSvc) {
// Observe empty-cache notifications so tahat clearing the disk/memory
// cache will also evict all content viewers.
obsSvc->AddObserver(gObserver, "cacheservice:empty-cache", false);
// Same for memory-pressure notifications
obsSvc->AddObserver(gObserver, "memory-pressure", false);
}
}
return NS_OK;
}
// static
void nsSHistory::Shutdown() {
if (gObserver) {
Preferences::UnregisterCallbacks(nsSHistoryObserver::PrefChanged,
kObservedPrefs, gObserver.get());
nsCOMPtr<nsIObserverService> obsSvc =
mozilla::services::GetObserverService();
if (obsSvc) {
obsSvc->RemoveObserver(gObserver, "cacheservice:empty-cache");
obsSvc->RemoveObserver(gObserver, "memory-pressure");
}
gObserver = nullptr;
}
}
// static
already_AddRefed<nsISHEntry> nsSHistory::GetRootSHEntry(nsISHEntry* aEntry) {
nsCOMPtr<nsISHEntry> rootEntry = aEntry;
nsCOMPtr<nsISHEntry> result = nullptr;
while (rootEntry) {
result = rootEntry;
rootEntry = result->GetParent();
}
return result.forget();
}
// static
nsresult nsSHistory::WalkHistoryEntries(nsISHEntry* aRootEntry,
BrowsingContext* aBC,
WalkHistoryEntriesFunc aCallback,
void* aData) {
NS_ENSURE_TRUE(aRootEntry, NS_ERROR_FAILURE);
int32_t childCount = aRootEntry->GetChildCount();
for (int32_t i = 0; i < childCount; i++) {
nsCOMPtr<nsISHEntry> childEntry;
aRootEntry->GetChildAt(i, getter_AddRefs(childEntry));
if (!childEntry) {
// childEntry can be null for valid reasons, for example if the
// docshell at index i never loaded anything useful.
// Remember to clone also nulls in the child array (bug 464064).
aCallback(nullptr, nullptr, i, aData);
continue;
}
BrowsingContext* childBC = nullptr;
if (aBC) {
for (BrowsingContext* child : aBC->Children()) {
// If the SH pref is on and we are in the parent process, update
// canonical BC directly
bool foundChild = false;
if (mozilla::SessionHistoryInParent() && XRE_IsParentProcess()) {
if (child->Canonical()->HasHistoryEntry(childEntry)) {
childBC = child;
foundChild = true;
}
}
nsDocShell* docshell = static_cast<nsDocShell*>(child->GetDocShell());
if (docshell && docshell->HasHistoryEntry(childEntry)) {
childBC = docshell->GetBrowsingContext();
foundChild = true;
}
// XXX Simplify this once the old and new session history
// implementations don't run at the same time.
if (foundChild) {
break;
}
}
}
nsresult rv = aCallback(childEntry, childBC, i, aData);
NS_ENSURE_SUCCESS(rv, rv);
}
return NS_OK;
}
// callback data for WalkHistoryEntries
struct MOZ_STACK_CLASS CloneAndReplaceData {
CloneAndReplaceData(uint32_t aCloneID, nsISHEntry* aReplaceEntry,
bool aCloneChildren, nsISHEntry* aDestTreeParent)
: cloneID(aCloneID),
cloneChildren(aCloneChildren),
replaceEntry(aReplaceEntry),
destTreeParent(aDestTreeParent) {}
uint32_t cloneID;
bool cloneChildren;
nsISHEntry* replaceEntry;
nsISHEntry* destTreeParent;
nsCOMPtr<nsISHEntry> resultEntry;
};
nsresult nsSHistory::CloneAndReplaceChild(nsISHEntry* aEntry,
BrowsingContext* aOwnerBC,
int32_t aChildIndex, void* aData) {
nsCOMPtr<nsISHEntry> dest;
CloneAndReplaceData* data = static_cast<CloneAndReplaceData*>(aData);
uint32_t cloneID = data->cloneID;
nsISHEntry* replaceEntry = data->replaceEntry;
if (!aEntry) {
if (data->destTreeParent) {
data->destTreeParent->AddChild(nullptr, aChildIndex);
}
return NS_OK;
}
uint32_t srcID = aEntry->GetID();
nsresult rv = NS_OK;
if (srcID == cloneID) {
// Replace the entry
dest = replaceEntry;
} else {
// Clone the SHEntry...
rv = aEntry->Clone(getter_AddRefs(dest));
NS_ENSURE_SUCCESS(rv, rv);
}
dest->SetIsSubFrame(true);
if (srcID != cloneID || data->cloneChildren) {
// Walk the children
CloneAndReplaceData childData(cloneID, replaceEntry, data->cloneChildren,
dest);
rv = nsSHistory::WalkHistoryEntries(aEntry, aOwnerBC, CloneAndReplaceChild,
&childData);
NS_ENSURE_SUCCESS(rv, rv);
}
if (srcID != cloneID && aOwnerBC) {
nsSHistory::HandleEntriesToSwapInDocShell(aOwnerBC, aEntry, dest);
}
if (data->destTreeParent) {
data->destTreeParent->AddChild(dest, aChildIndex);
}
data->resultEntry = dest;
return rv;
}
// static
nsresult nsSHistory::CloneAndReplace(
nsISHEntry* aSrcEntry, BrowsingContext* aOwnerBC, uint32_t aCloneID,
nsISHEntry* aReplaceEntry, bool aCloneChildren, nsISHEntry** aDestEntry) {
NS_ENSURE_ARG_POINTER(aDestEntry);
NS_ENSURE_TRUE(aReplaceEntry, NS_ERROR_FAILURE);
CloneAndReplaceData data(aCloneID, aReplaceEntry, aCloneChildren, nullptr);
nsresult rv = CloneAndReplaceChild(aSrcEntry, aOwnerBC, 0, &data);
data.resultEntry.swap(*aDestEntry);
return rv;
}
// static
void nsSHistory::WalkContiguousEntries(
nsISHEntry* aEntry, const std::function<void(nsISHEntry*)>& aCallback) {
MOZ_ASSERT(aEntry);
nsCOMPtr<nsISHistory> shistory = aEntry->GetShistory();
if (!shistory) {
// If there is no session history in the entry, it means this is not a root
// entry. So, we can return from here.
return;
}
int32_t index = shistory->GetIndexOfEntry(aEntry);
int32_t count = shistory->GetCount();
nsCOMPtr<nsIURI> targetURI = aEntry->GetURI();
// First, call the callback on the input entry.
aCallback(aEntry);
// Walk backward to find the entries that have the same origin as the
// input entry.
for (int32_t i = index - 1; i >= 0; i--) {
RefPtr<nsISHEntry> entry;
shistory->GetEntryAtIndex(i, getter_AddRefs(entry));
if (entry) {
nsCOMPtr<nsIURI> uri = entry->GetURI();
if (NS_FAILED(nsContentUtils::GetSecurityManager()->CheckSameOriginURI(
targetURI, uri, false, false))) {
break;
}
aCallback(entry);
}
}
// Then, Walk forward.
for (int32_t i = index + 1; i < count; i++) {
RefPtr<nsISHEntry> entry;
shistory->GetEntryAtIndex(i, getter_AddRefs(entry));
if (entry) {
nsCOMPtr<nsIURI> uri = entry->GetURI();
if (NS_FAILED(nsContentUtils::GetSecurityManager()->CheckSameOriginURI(
targetURI, uri, false, false))) {
break;
}
aCallback(entry);
}
}
}
NS_IMETHODIMP
nsSHistory::AddChildSHEntryHelper(nsISHEntry* aCloneRef, nsISHEntry* aNewEntry,
BrowsingContext* aRootBC,
bool aCloneChildren) {
MOZ_ASSERT(aRootBC->IsTop());
/* You are currently in the rootDocShell.
* You will get here when a subframe has a new url
* to load and you have walked up the tree all the
* way to the top to clone the current SHEntry hierarchy
* and replace the subframe where a new url was loaded with
* a new entry.
*/
nsCOMPtr<nsISHEntry> child;
nsCOMPtr<nsISHEntry> currentHE;
int32_t index = mIndex;
if (index < 0) {
return NS_ERROR_FAILURE;
}
GetEntryAtIndex(index, getter_AddRefs(currentHE));
NS_ENSURE_TRUE(currentHE, NS_ERROR_FAILURE);
nsresult rv = NS_OK;
uint32_t cloneID = aCloneRef->GetID();
rv = nsSHistory::CloneAndReplace(currentHE, aRootBC, cloneID, aNewEntry,
aCloneChildren, getter_AddRefs(child));
if (NS_SUCCEEDED(rv)) {
rv = AddEntry(child, true);
if (NS_SUCCEEDED(rv)) {
child->SetDocshellID(aRootBC->GetHistoryID());
}
}
return rv;
}
nsresult nsSHistory::SetChildHistoryEntry(nsISHEntry* aEntry,
BrowsingContext* aBC,
int32_t aEntryIndex, void* aData) {
SwapEntriesData* data = static_cast<SwapEntriesData*>(aData);
if (!aBC || aBC == data->ignoreBC) {
return NS_OK;
}
nsISHEntry* destTreeRoot = data->destTreeRoot;
nsCOMPtr<nsISHEntry> destEntry;
if (data->destTreeParent) {
// aEntry is a clone of some child of destTreeParent, but since the
// trees aren't necessarily in sync, we'll have to locate it.
// Note that we could set aShell's entry to null if we don't find a
// corresponding entry under destTreeParent.
uint32_t targetID = aEntry->GetID();
// First look at the given index, since this is the common case.
nsCOMPtr<nsISHEntry> entry;
data->destTreeParent->GetChildAt(aEntryIndex, getter_AddRefs(entry));
if (entry && entry->GetID() == targetID) {
destEntry.swap(entry);
} else {
int32_t childCount;
data->destTreeParent->GetChildCount(&childCount);
for (int32_t i = 0; i < childCount; ++i) {
data->destTreeParent->GetChildAt(i, getter_AddRefs(entry));
if (!entry) {
continue;
}
if (entry->GetID() == targetID) {
destEntry.swap(entry);
break;
}
}
}
} else {
destEntry = destTreeRoot;
}
nsSHistory::HandleEntriesToSwapInDocShell(aBC, aEntry, destEntry);
// Now handle the children of aEntry.
SwapEntriesData childData = {data->ignoreBC, destTreeRoot, destEntry};
return nsSHistory::WalkHistoryEntries(aEntry, aBC, SetChildHistoryEntry,
&childData);
}
// static
void nsSHistory::HandleEntriesToSwapInDocShell(
mozilla::dom::BrowsingContext* aBC, nsISHEntry* aOldEntry,
nsISHEntry* aNewEntry) {
bool shPref = mozilla::SessionHistoryInParent();
if (aBC->IsInProcess() || !shPref) {
nsDocShell* docshell = static_cast<nsDocShell*>(aBC->GetDocShell());
if (docshell) {
docshell->SwapHistoryEntries(aOldEntry, aNewEntry);
}
} else {
// FIXME Bug 1633988: Need to update entries?
}
// XXX Simplify this once the old and new session history implementations
// don't run at the same time.
if (shPref && XRE_IsParentProcess()) {
aBC->Canonical()->SwapHistoryEntries(aOldEntry, aNewEntry);
}
}
void nsSHistory::UpdateRootBrowsingContextState(BrowsingContext* aRootBC) {
if (aRootBC && aRootBC->EverAttached()) {
bool sameDocument = IsEmptyOrHasEntriesForSingleTopLevelPage();
if (sameDocument != aRootBC->GetIsSingleToplevelInHistory()) {
// If the browsing context is discarded then its session history is
// invalid and will go away.
Unused << aRootBC->SetIsSingleToplevelInHistory(sameDocument);
}
}
}
NS_IMETHODIMP
nsSHistory::AddToRootSessionHistory(bool aCloneChildren, nsISHEntry* aOSHE,
BrowsingContext* aRootBC,
nsISHEntry* aEntry, uint32_t aLoadType,
bool aShouldPersist,
Maybe<int32_t>* aPreviousEntryIndex,
Maybe<int32_t>* aLoadedEntryIndex) {
MOZ_ASSERT(aRootBC->IsTop());
nsresult rv = NS_OK;
// If we need to clone our children onto the new session
// history entry, do so now.
if (aCloneChildren && aOSHE) {
uint32_t cloneID = aOSHE->GetID();
nsCOMPtr<nsISHEntry> newEntry;
nsSHistory::CloneAndReplace(aOSHE, aRootBC, cloneID, aEntry, true,
getter_AddRefs(newEntry));
NS_ASSERTION(aEntry == newEntry,
"The new session history should be in the new entry");
}
// This is the root docshell
bool addToSHistory = !LOAD_TYPE_HAS_FLAGS(
aLoadType, nsIWebNavigation::LOAD_FLAGS_REPLACE_HISTORY);
if (!addToSHistory) {
// Replace current entry in session history; If the requested index is
// valid, it indicates the loading was triggered by a history load, and
// we should replace the entry at requested index instead.
int32_t index = GetIndexForReplace();
// Replace the current entry with the new entry
if (index >= 0) {
rv = ReplaceEntry(index, aEntry);
} else {
// If we're trying to replace an inexistant shistory entry, append.
addToSHistory = true;
}
}
if (addToSHistory) {
// Add to session history
*aPreviousEntryIndex = Some(mIndex);
rv = AddEntry(aEntry, aShouldPersist);
*aLoadedEntryIndex = Some(mIndex);
MOZ_LOG(gPageCacheLog, LogLevel::Verbose,
("Previous index: %d, Loaded index: %d",
aPreviousEntryIndex->value(), aLoadedEntryIndex->value()));
}
if (NS_SUCCEEDED(rv)) {
aEntry->SetDocshellID(aRootBC->GetHistoryID());
}
return rv;
}
/* Add an entry to the History list at mIndex and
* increment the index to point to the new entry
*/
NS_IMETHODIMP
nsSHistory::AddEntry(nsISHEntry* aSHEntry, bool aPersist) {
NS_ENSURE_ARG(aSHEntry);
nsCOMPtr<nsISHistory> shistoryOfEntry = aSHEntry->GetShistory();
if (shistoryOfEntry && shistoryOfEntry != this) {
NS_WARNING(
"The entry has been associated to another nsISHistory instance. "
"Try nsISHEntry.clone() and nsISHEntry.abandonBFCacheEntry() "
"first if you're copying an entry from another nsISHistory.");
return NS_ERROR_FAILURE;
}
aSHEntry->SetShistory(this);
// If we have a root docshell, update the docshell id of the root shentry to
// match the id of that docshell
RefPtr<BrowsingContext> rootBC = GetBrowsingContext();
if (rootBC) {
aSHEntry->SetDocshellID(mRootDocShellID);
}
if (mIndex >= 0) {
MOZ_ASSERT(mIndex < Length(), "Index out of range!");
if (mIndex >= Length()) {
return NS_ERROR_FAILURE;
}
if (mEntries[mIndex] && !mEntries[mIndex]->GetPersist()) {
NotifyListeners(mListeners, [](auto l) { l->OnHistoryReplaceEntry(); });
aSHEntry->SetPersist(aPersist);
mEntries[mIndex] = aSHEntry;
UpdateRootBrowsingContextState();
return NS_OK;
}
}
SHistoryChangeNotifier change(this);
int32_t truncating = Length() - 1 - mIndex;
if (truncating > 0) {
NotifyListeners(mListeners,
[truncating](auto l) { l->OnHistoryTruncate(truncating); });
}
nsCOMPtr<nsIURI> uri = aSHEntry->GetURI();
NotifyListeners(mListeners,
[&uri, this](auto l) { l->OnHistoryNewEntry(uri, mIndex); });
// Remove all entries after the current one, add the new one, and set the
// new one as the current one.
MOZ_ASSERT(mIndex >= -1);
aSHEntry->SetPersist(aPersist);
mEntries.TruncateLength(mIndex + 1);
mEntries.AppendElement(aSHEntry);
mIndex++;
if (mIndex > 0) {
UpdateEntryLength(mEntries[mIndex - 1], mEntries[mIndex], false);
}
// Purge History list if it is too long
if (gHistoryMaxSize >= 0 && Length() > gHistoryMaxSize) {
PurgeHistory(Length() - gHistoryMaxSize);
}
UpdateRootBrowsingContextState();
return NS_OK;
}
void nsSHistory::NotifyOnHistoryReplaceEntry() {
NotifyListeners(mListeners, [](auto l) { l->OnHistoryReplaceEntry(); });
}
/* Get size of the history list */
NS_IMETHODIMP
nsSHistory::GetCount(int32_t* aResult) {
MOZ_ASSERT(aResult, "null out param?");
*aResult = Length();
return NS_OK;
}
NS_IMETHODIMP
nsSHistory::GetIndex(int32_t* aResult) {
MOZ_ASSERT(aResult, "null out param?");
*aResult = mIndex;
return NS_OK;
}
NS_IMETHODIMP
nsSHistory::SetIndex(int32_t aIndex) {
if (aIndex < 0 || aIndex >= Length()) {
return NS_ERROR_FAILURE;
}
mIndex = aIndex;
return NS_OK;
}
/* Get the requestedIndex */
NS_IMETHODIMP
nsSHistory::GetRequestedIndex(int32_t* aResult) {
MOZ_ASSERT(aResult, "null out param?");
*aResult = mRequestedIndex;
return NS_OK;
}
NS_IMETHODIMP_(void)
nsSHistory::InternalSetRequestedIndex(int32_t aRequestedIndex) {
MOZ_ASSERT(aRequestedIndex >= -1 && aRequestedIndex < Length());
mRequestedIndex = aRequestedIndex;
}
NS_IMETHODIMP
nsSHistory::GetEntryAtIndex(int32_t aIndex, nsISHEntry** aResult) {
NS_ENSURE_ARG_POINTER(aResult);
if (aIndex < 0 || aIndex >= Length()) {
return NS_ERROR_FAILURE;
}
*aResult = mEntries[aIndex];
NS_ADDREF(*aResult);
return NS_OK;
}
NS_IMETHODIMP_(int32_t)
nsSHistory::GetIndexOfEntry(nsISHEntry* aSHEntry) {
for (int32_t i = 0; i < Length(); i++) {
if (aSHEntry == mEntries[i]) {
return i;
}
}
return -1;
}
static void LogEntry(nsISHEntry* aEntry, int32_t aIndex, int32_t aTotal,
const nsCString& aPrefix, bool aIsCurrent) {
if (!aEntry) {
MOZ_LOG(gSHLog, LogLevel::Debug,
(" %s+- %i SH Entry null\n", aPrefix.get(), aIndex));
return;
}
nsCOMPtr<nsIURI> uri = aEntry->GetURI();
nsAutoString title, name;
aEntry->GetTitle(title);
aEntry->GetName(name);
SHEntrySharedParentState* shared;
if (mozilla::SessionHistoryInParent()) {
shared = static_cast<SessionHistoryEntry*>(aEntry)->SharedInfo();
} else {
shared = static_cast<nsSHEntry*>(aEntry)->GetState();
}
nsID docShellId;
aEntry->GetDocshellID(docShellId);
int32_t childCount = aEntry->GetChildCount();
MOZ_LOG(gSHLog, LogLevel::Debug,
("%s%s+- %i SH Entry %p %" PRIu64 " %s\n", aIsCurrent ? ">" : " ",
aPrefix.get(), aIndex, aEntry, shared->GetId(),
nsIDToCString(docShellId).get()));
nsCString prefix(aPrefix);
if (aIndex < aTotal - 1) {
prefix.AppendLiteral("| ");
} else {
prefix.AppendLiteral(" ");
}
MOZ_LOG(gSHLog, LogLevel::Debug,
(" %s%s URL = %s\n", prefix.get(), childCount > 0 ? "|" : " ",
uri->GetSpecOrDefault().get()));
MOZ_LOG(gSHLog, LogLevel::Debug,
(" %s%s Title = %s\n", prefix.get(), childCount > 0 ? "|" : " ",
NS_LossyConvertUTF16toASCII(title).get()));
MOZ_LOG(gSHLog, LogLevel::Debug,
(" %s%s Name = %s\n", prefix.get(), childCount > 0 ? "|" : " ",
NS_LossyConvertUTF16toASCII(name).get()));
MOZ_LOG(
gSHLog, LogLevel::Debug,
(" %s%s Is in BFCache = %s\n", prefix.get(), childCount > 0 ? "|" : " ",
aEntry->GetIsInBFCache() ? "true" : "false"));
nsCOMPtr<nsISHEntry> prevChild;
for (int32_t i = 0; i < childCount; ++i) {
nsCOMPtr<nsISHEntry> child;
aEntry->GetChildAt(i, getter_AddRefs(child));
LogEntry(child, i, childCount, prefix, false);
child.swap(prevChild);
}
}
void nsSHistory::LogHistory() {
if (!MOZ_LOG_TEST(gSHLog, LogLevel::Debug)) {
return;
}
MOZ_LOG(gSHLog, LogLevel::Debug, ("nsSHistory %p\n", this));
int32_t length = Length();
for (int32_t i = 0; i < length; i++) {
LogEntry(mEntries[i], i, length, EmptyCString(), i == mIndex);
}
}
void nsSHistory::WindowIndices(int32_t aIndex, int32_t* aOutStartIndex,
int32_t* aOutEndIndex) {
*aOutStartIndex = std::max(0, aIndex - nsSHistory::VIEWER_WINDOW);
*aOutEndIndex = std::min(Length() - 1, aIndex + nsSHistory::VIEWER_WINDOW);
}
static void MarkAsInitialEntry(
SessionHistoryEntry* aEntry,
nsTHashMap<nsIDHashKey, SessionHistoryEntry*>& aHashtable) {
if (!aEntry->BCHistoryLength().Modified()) {
++(aEntry->BCHistoryLength());
}
aHashtable.InsertOrUpdate(aEntry->DocshellID(), aEntry);
for (const RefPtr<SessionHistoryEntry>& entry : aEntry->Children()) {
if (entry) {
MarkAsInitialEntry(entry, aHashtable);
}
}
}
static void ClearEntries(SessionHistoryEntry* aEntry) {
aEntry->ClearBCHistoryLength();
for (const RefPtr<SessionHistoryEntry>& entry : aEntry->Children()) {
if (entry) {
ClearEntries(entry);
}
}
}
NS_IMETHODIMP
nsSHistory::PurgeHistory(int32_t aNumEntries) {
if (Length() <= 0 || aNumEntries <= 0) {
return NS_ERROR_FAILURE;
}
SHistoryChangeNotifier change(this);
aNumEntries = std::min(aNumEntries, Length());
NotifyListeners(mListeners,
[aNumEntries](auto l) { l->OnHistoryPurge(aNumEntries); });
// Set all the entries hanging of the first entry that we keep
// (mEntries[aNumEntries]) as being created as the result of a load
// (so contributing one to their BCHistoryLength).
nsTHashMap<nsIDHashKey, SessionHistoryEntry*> docshellIDToEntry;
if (aNumEntries != Length()) {
nsCOMPtr<SessionHistoryEntry> she =
do_QueryInterface(mEntries[aNumEntries]);
if (she) {
MarkAsInitialEntry(she, docshellIDToEntry);
}
}
// Reset the BCHistoryLength of all the entries that we're removing to a new
// counter with value 0 while decreasing their contribution to a shared
// BCHistoryLength. The end result is that they don't contribute to the
// BCHistoryLength of any other entry anymore.
for (int32_t i = 0; i < aNumEntries; ++i) {
nsCOMPtr<SessionHistoryEntry> she = do_QueryInterface(mEntries[i]);
if (she) {
ClearEntries(she);
}
}
RefPtr<BrowsingContext> rootBC = GetBrowsingContext();
if (rootBC) {
rootBC->PreOrderWalk([&docshellIDToEntry](BrowsingContext* aBC) {
SessionHistoryEntry* entry = docshellIDToEntry.Get(aBC->GetHistoryID());
Unused << aBC->SetHistoryEntryCount(
entry ? uint32_t(entry->BCHistoryLength()) : 0);
});
}
// Remove the first `aNumEntries` entries.
mEntries.RemoveElementsAt(0, aNumEntries);
// Adjust the indices, but don't let them go below -1.
mIndex -= aNumEntries;
mIndex = std::max(mIndex, -1);
mRequestedIndex -= aNumEntries;
mRequestedIndex = std::max(mRequestedIndex, -1);
if (rootBC && rootBC->GetDocShell()) {
rootBC->GetDocShell()->HistoryPurged(aNumEntries);
}
UpdateRootBrowsingContextState(rootBC);
return NS_OK;
}
NS_IMETHODIMP
nsSHistory::AddSHistoryListener(nsISHistoryListener* aListener) {
NS_ENSURE_ARG_POINTER(aListener);
// Check if the listener supports Weak Reference. This is a must.
// This listener functionality is used by embedders and we want to
// have the right ownership with who ever listens to SHistory
nsWeakPtr listener = do_GetWeakReference(aListener);
if (!listener) {
return NS_ERROR_FAILURE;
}
mListeners.AppendElementUnlessExists(listener);
return NS_OK;
}
void nsSHistory::NotifyListenersContentViewerEvicted(uint32_t aNumEvicted) {
NotifyListeners(mListeners, [aNumEvicted](auto l) {
l->OnContentViewerEvicted(aNumEvicted);
});
}
NS_IMETHODIMP
nsSHistory::RemoveSHistoryListener(nsISHistoryListener* aListener) {
// Make sure the listener that wants to be removed is the
// one we have in store.
nsWeakPtr listener = do_GetWeakReference(aListener);
mListeners.RemoveElement(listener);
return NS_OK;
}
/* Replace an entry in the History list at a particular index.
* Do not update index or count.
*/
NS_IMETHODIMP
nsSHistory::ReplaceEntry(int32_t aIndex, nsISHEntry* aReplaceEntry) {
NS_ENSURE_ARG(aReplaceEntry);
if (aIndex < 0 || aIndex >= Length()) {
return NS_ERROR_FAILURE;
}
nsCOMPtr<nsISHistory> shistoryOfEntry = aReplaceEntry->GetShistory();
if (shistoryOfEntry && shistoryOfEntry != this) {
NS_WARNING(
"The entry has been associated to another nsISHistory instance. "
"Try nsISHEntry.clone() and nsISHEntry.abandonBFCacheEntry() "
"first if you're copying an entry from another nsISHistory.");
return NS_ERROR_FAILURE;
}
aReplaceEntry->SetShistory(this);
NotifyListeners(mListeners, [](auto l) { l->OnHistoryReplaceEntry(); });
aReplaceEntry->SetPersist(true);
mEntries[aIndex] = aReplaceEntry;
UpdateRootBrowsingContextState();
return NS_OK;
}
// Calls OnHistoryReload on all registered session history listeners.
// Listeners may return 'false' to cancel an action so make sure that we
// set the return value to 'false' if one of the listeners wants to cancel.
NS_IMETHODIMP
nsSHistory::NotifyOnHistoryReload(bool* aCanReload) {
*aCanReload = true;
for (const nsWeakPtr& weakPtr : mListeners.EndLimitedRange()) {
nsCOMPtr<nsISHistoryListener> listener = do_QueryReferent(weakPtr);
if (listener) {
bool retval = true;
if (NS_SUCCEEDED(listener->OnHistoryReload(&retval)) && !retval) {
*aCanReload = false;
}
}
}
return NS_OK;
}
NS_IMETHODIMP
nsSHistory::EvictOutOfRangeContentViewers(int32_t aIndex) {
MOZ_LOG(gSHIPBFCacheLog, LogLevel::Debug,
("nsSHistory::EvictOutOfRangeContentViewers %i", aIndex));
// Check our per SHistory object limit in the currently navigated SHistory
EvictOutOfRangeWindowContentViewers(aIndex);
// Check our total limit across all SHistory objects
GloballyEvictContentViewers();
return NS_OK;
}
NS_IMETHODIMP_(void)
nsSHistory::EvictContentViewersOrReplaceEntry(nsISHEntry* aNewSHEntry,
bool aReplace) {
if (!aReplace) {
int32_t curIndex;
GetIndex(&curIndex);
if (curIndex > -1) {
EvictOutOfRangeContentViewers(curIndex);
}
} else {
nsCOMPtr<nsISHEntry> rootSHEntry = nsSHistory::GetRootSHEntry(aNewSHEntry);
int32_t index = GetIndexOfEntry(rootSHEntry);
if (index > -1) {
ReplaceEntry(index, rootSHEntry);
}
}
}
NS_IMETHODIMP
nsSHistory::EvictAllContentViewers() {
// XXXbz we don't actually do a good job of evicting things as we should, so
// we might have viewers quite far from mIndex. So just evict everything.
for (int32_t i = 0; i < Length(); i++) {
EvictContentViewerForEntry(mEntries[i]);
}
return NS_OK;
}
static void FinishRestore(CanonicalBrowsingContext* aBrowsingContext,
nsDocShellLoadState* aLoadState,
SessionHistoryEntry* aEntry,
nsFrameLoader* aFrameLoader, bool aCanSave) {
MOZ_ASSERT(aEntry);
MOZ_ASSERT(aFrameLoader);
aEntry->SetFrameLoader(nullptr);
nsCOMPtr<nsISHistory> shistory = aEntry->GetShistory();
int32_t indexOfHistoryLoad =
shistory ? shistory->GetIndexOfEntry(aEntry) : -1;
nsCOMPtr<nsFrameLoaderOwner> frameLoaderOwner =
do_QueryInterface(aBrowsingContext->GetEmbedderElement());
if (frameLoaderOwner && aFrameLoader->GetMaybePendingBrowsingContext() &&
indexOfHistoryLoad >= 0) {
RefPtr<BrowsingContextWebProgress> webProgress =
aBrowsingContext->GetWebProgress();
if (webProgress) {
// Synthesize a STATE_START WebProgress state change event from here
// in order to ensure emitting it on the BrowsingContext we navigate
// *from* instead of the BrowsingContext we navigate *to*. This will fire
// before and the next one will be ignored by BrowsingContextWebProgress:
nsCOMPtr<nsIURI> nextURI = aEntry->GetURI();
nsCOMPtr<nsIURI> nextOriginalURI = aEntry->GetOriginalURI();
nsCOMPtr<nsIRequest> request = MakeAndAddRef<RemoteWebProgressRequest>(
nextURI, nextOriginalURI ? nextOriginalURI : nextURI,
""_ns /* aMatchedList */);
webProgress->OnStateChange(webProgress, request,
nsIWebProgressListener::STATE_START |
nsIWebProgressListener::STATE_IS_DOCUMENT |
nsIWebProgressListener::STATE_IS_REQUEST |
nsIWebProgressListener::STATE_IS_WINDOW |
nsIWebProgressListener::STATE_IS_NETWORK,
NS_OK);
}
RefPtr<CanonicalBrowsingContext> loadingBC =
aFrameLoader->GetMaybePendingBrowsingContext()->Canonical();
RefPtr<nsFrameLoader> currentFrameLoader =
frameLoaderOwner->GetFrameLoader();
// The current page can be bfcached, store the
// nsFrameLoader in the current SessionHistoryEntry.
RefPtr<SessionHistoryEntry> currentSHEntry =
aBrowsingContext->GetActiveSessionHistoryEntry();
if (currentSHEntry) {
// Update layout history state now, before we change the IsInBFCache flag
// and the active session history entry.
aBrowsingContext->SynchronizeLayoutHistoryState();
if (aCanSave) {
currentSHEntry->SetFrameLoader(currentFrameLoader);
Unused << aBrowsingContext->SetIsInBFCache(true);
}
}
if (aBrowsingContext->IsActive()) {
loadingBC->PreOrderWalk([&](BrowsingContext* aContext) {
if (BrowserParent* bp = aContext->Canonical()->GetBrowserParent()) {
ProcessPriorityManager::BrowserPriorityChanged(bp, true);
}
});
}
if (aEntry) {
aEntry->SetWireframe(Nothing());
}
// ReplacedBy will swap the entry back.
aBrowsingContext->SetActiveSessionHistoryEntry(aEntry);
loadingBC->SetActiveSessionHistoryEntry(nullptr);
NavigationIsolationOptions options;
aBrowsingContext->ReplacedBy(loadingBC, options);
// Assuming we still have the session history, update the index.
if (loadingBC->GetSessionHistory()) {
shistory->InternalSetRequestedIndex(indexOfHistoryLoad);
shistory->UpdateIndex();
}
loadingBC->HistoryCommitIndexAndLength();
// ResetSHEntryHasUserInteractionCache(); ?
// browser.navigation.requireUserInteraction is still
// disabled everywhere.
frameLoaderOwner->RestoreFrameLoaderFromBFCache(aFrameLoader);
// The old page can't be stored in the bfcache,
// destroy the nsFrameLoader.
if (!aCanSave && currentFrameLoader) {
currentFrameLoader->Destroy();
}
Unused << loadingBC->SetIsInBFCache(false);
// We need to call this after we've restored the page from BFCache (see
// SetIsInBFCache(false) above), so that the page is not frozen anymore and
// the right focus events are fired.
frameLoaderOwner->UpdateFocusAndMouseEnterStateAfterFrameLoaderChange();
return;
}
aFrameLoader->Destroy();
// Fall back to do a normal load.
aBrowsingContext->LoadURI(aLoadState, false);
}
/* static */
void nsSHistory::LoadURIOrBFCache(LoadEntryResult& aLoadEntry) {
if (mozilla::BFCacheInParent() && aLoadEntry.mBrowsingContext->IsTop()) {
MOZ_ASSERT(XRE_IsParentProcess());
RefPtr<nsDocShellLoadState> loadState = aLoadEntry.mLoadState;
RefPtr<CanonicalBrowsingContext> canonicalBC =
aLoadEntry.mBrowsingContext->Canonical();
nsCOMPtr<SessionHistoryEntry> she = do_QueryInterface(loadState->SHEntry());
nsCOMPtr<SessionHistoryEntry> currentShe =
canonicalBC->GetActiveSessionHistoryEntry();
MOZ_ASSERT(she);
RefPtr<nsFrameLoader> frameLoader = she->GetFrameLoader();
if (frameLoader &&
(!currentShe || (she->SharedInfo() != currentShe->SharedInfo() &&
!currentShe->GetFrameLoader()))) {
bool canSave = (!currentShe || currentShe->GetSaveLayoutStateFlag()) &&
canonicalBC->AllowedInBFCache(Nothing(), nullptr);
MOZ_LOG(gSHIPBFCacheLog, LogLevel::Debug,
("nsSHistory::LoadURIOrBFCache "
"saving presentation=%i",
canSave));
nsCOMPtr<nsFrameLoaderOwner> frameLoaderOwner =
do_QueryInterface(canonicalBC->GetEmbedderElement());
if (frameLoaderOwner) {
RefPtr<nsFrameLoader> currentFrameLoader =
frameLoaderOwner->GetFrameLoader();
if (currentFrameLoader &&
currentFrameLoader->GetMaybePendingBrowsingContext()) {
if (WindowGlobalParent* wgp =
currentFrameLoader->GetMaybePendingBrowsingContext()
->Canonical()
->GetCurrentWindowGlobal()) {
wgp->PermitUnload([canonicalBC, loadState, she, frameLoader,
currentFrameLoader, canSave](bool aAllow) {
if (aAllow) {
FinishRestore(canonicalBC, loadState, she, frameLoader,
canSave && canonicalBC->AllowedInBFCache(
Nothing(), nullptr));
} else if (currentFrameLoader->GetMaybePendingBrowsingContext()) {
nsISHistory* shistory =
currentFrameLoader->GetMaybePendingBrowsingContext()
->Canonical()
->GetSessionHistory();
if (shistory) {
shistory->InternalSetRequestedIndex(-1);
}
}
});
return;
}
}
}
FinishRestore(canonicalBC, loadState, she, frameLoader, canSave);
return;
}
if (frameLoader) {
she->SetFrameLoader(nullptr);
frameLoader->Destroy();
}
}
aLoadEntry.mBrowsingContext->LoadURI(aLoadEntry.mLoadState, false);
}
/* static */
void nsSHistory::LoadURIs(nsTArray<LoadEntryResult>& aLoadResults) {
for (LoadEntryResult& loadEntry : aLoadResults) {
LoadURIOrBFCache(loadEntry);
}
}
NS_IMETHODIMP
nsSHistory::Reload(uint32_t aReloadFlags) {
nsTArray<LoadEntryResult> loadResults;
nsresult rv = Reload(aReloadFlags, loadResults);
NS_ENSURE_SUCCESS(rv, rv);
if (loadResults.IsEmpty()) {
return NS_OK;
}
LoadURIs(loadResults);
return NS_OK;
}
nsresult nsSHistory::Reload(uint32_t aReloadFlags,
nsTArray<LoadEntryResult>& aLoadResults) {
MOZ_ASSERT(aLoadResults.IsEmpty());
uint32_t loadType;
if (aReloadFlags & nsIWebNavigation::LOAD_FLAGS_BYPASS_PROXY &&
aReloadFlags & nsIWebNavigation::LOAD_FLAGS_BYPASS_CACHE) {
loadType = LOAD_RELOAD_BYPASS_PROXY_AND_CACHE;
} else if (aReloadFlags & nsIWebNavigation::LOAD_FLAGS_BYPASS_PROXY) {
loadType = LOAD_RELOAD_BYPASS_PROXY;
} else if (aReloadFlags & nsIWebNavigation::LOAD_FLAGS_BYPASS_CACHE) {
loadType = LOAD_RELOAD_BYPASS_CACHE;
} else if (aReloadFlags & nsIWebNavigation::LOAD_FLAGS_CHARSET_CHANGE) {
loadType = LOAD_RELOAD_CHARSET_CHANGE;
} else {
loadType = LOAD_RELOAD_NORMAL;
}
// We are reloading. Send Reload notifications.
// nsDocShellLoadFlagType is not public, where as nsIWebNavigation
// is public. So send the reload notifications with the
// nsIWebNavigation flags.
bool canNavigate = true;
MOZ_ALWAYS_SUCCEEDS(NotifyOnHistoryReload(&canNavigate));
if (!canNavigate) {
return NS_OK;
}
nsresult rv = LoadEntry(
mIndex, loadType, HIST_CMD_RELOAD, aLoadResults, /* aSameEpoch */ false,
/* aLoadCurrentEntry */ true,
aReloadFlags & nsIWebNavigation::LOAD_FLAGS_USER_ACTIVATION);
if (NS_FAILED(rv)) {
aLoadResults.Clear();
return rv;
}
return NS_OK;
}
NS_IMETHODIMP
nsSHistory::ReloadCurrentEntry() {
nsTArray<LoadEntryResult> loadResults;
nsresult rv = ReloadCurrentEntry(loadResults);
NS_ENSURE_SUCCESS(rv, rv);
LoadURIs(loadResults);
return NS_OK;
}
nsresult nsSHistory::ReloadCurrentEntry(
nsTArray<LoadEntryResult>& aLoadResults) {
// Notify listeners
NotifyListeners(mListeners, [](auto l) { l->OnHistoryGotoIndex(); });
return LoadEntry(mIndex, LOAD_HISTORY, HIST_CMD_RELOAD, aLoadResults,
/* aSameEpoch */ false, /* aLoadCurrentEntry */ true,
/* aUserActivation */ false);
}
void nsSHistory::EvictOutOfRangeWindowContentViewers(int32_t aIndex) {
// XXX rename method to EvictContentViewersExceptAroundIndex, or something.
// We need to release all content viewers that are no longer in the range
//
// aIndex - VIEWER_WINDOW to aIndex + VIEWER_WINDOW
//
// to ensure that this SHistory object isn't responsible for more than
// VIEWER_WINDOW content viewers. But our job is complicated by the
// fact that two entries which are related by either hash navigations or
// history.pushState will have the same content viewer.
//
// To illustrate the issue, suppose VIEWER_WINDOW = 3 and we have four
// linked entries in our history. Suppose we then add a new content
// viewer and call into this function. So the history looks like:
//
// A A A A B
// + *
//
// where the letters are content viewers and + and * denote the beginning and
// end of the range aIndex +/- VIEWER_WINDOW.
//
// Although one copy of the content viewer A exists outside the range, we
// don't want to evict A, because it has other copies in range!
//
// We therefore adjust our eviction strategy to read:
//
// Evict each content viewer outside the range aIndex -/+
// VIEWER_WINDOW, unless that content viewer also appears within the
// range.
//
// (Note that it's entirely legal to have two copies of one content viewer
// separated by a different content viewer -- call pushState twice, go back
// once, and refresh -- so we can't rely on identical viewers only appearing
// adjacent to one another.)
if (aIndex < 0) {
return;
}
NS_ENSURE_TRUE_VOID(aIndex < Length());
// Calculate the range that's safe from eviction.
int32_t startSafeIndex, endSafeIndex;
WindowIndices(aIndex, &startSafeIndex, &endSafeIndex);
LOG(
("EvictOutOfRangeWindowContentViewers(index=%d), "
"Length()=%d. Safe range [%d, %d]",
aIndex, Length(), startSafeIndex, endSafeIndex));
// The content viewers in range aIndex -/+ VIEWER_WINDOW will not be
// evicted. Collect a set of them so we don't accidentally evict one of them
// if it appears outside this range.
nsCOMArray<nsIContentViewer> safeViewers;
nsTArray<RefPtr<nsFrameLoader>> safeFrameLoaders;
for (int32_t i = startSafeIndex; i <= endSafeIndex; i++) {
nsCOMPtr<nsIContentViewer> viewer = mEntries[i]->GetContentViewer();
if (viewer) {
safeViewers.AppendObject(viewer);
} else if (nsCOMPtr<SessionHistoryEntry> she =
do_QueryInterface(mEntries[i])) {
nsFrameLoader* frameLoader = she->GetFrameLoader();
if (frameLoader) {
safeFrameLoaders.AppendElement(frameLoader);
}
}
}
// Walk the SHistory list and evict any content viewers that aren't safe.
// (It's important that the condition checks Length(), rather than a cached