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gecko-dev/docshell/shistory/nsSHistory.cpp

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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 "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 "nsNetUtil.h"
#include "nsSHEntry.h"
#include "nsTArray.h"
#include "prsystem.h"
#include "mozilla/Attributes.h"
#include "mozilla/dom/CanonicalBrowsingContext.h"
#include "mozilla/dom/ContentParent.h"
#include "mozilla/LinkedList.h"
#include "mozilla/MathAlgorithms.h"
#include "mozilla/Preferences.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"
// 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, nullptr};
static int32_t gHistoryMaxSize = 50;
// List of all SHistory objects, used for content viewer cache eviction
static LinkedList<nsSHistory> 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;
LazyLogModule gSHistoryLog("nsSHistory");
#define LOG(format) MOZ_LOG(gSHistoryLog, mozilla::LogLevel::Debug, format)
extern mozilla::LazyLogModule gPageCacheLog;
// 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
// Iterates over all registered session history listeners.
#define ITERATE_LISTENERS(body) \
PR_BEGIN_MACRO { \
for (const nsWeakPtr& weakPtr : mListeners.EndLimitedRange()) { \
nsCOMPtr<nsISHistoryListener> listener = do_QueryReferent(weakPtr); \
if (listener) { \
body \
} \
} \
} \
PR_END_MACRO
// Calls a given method on all registered session history listeners.
#define NOTIFY_LISTENERS(method, args) \
ITERATE_LISTENERS(listener->method args;);
// Calls a given method 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.
#define NOTIFY_LISTENERS_CANCELABLE(method, retval, args) \
PR_BEGIN_MACRO { \
bool canceled = false; \
retval = true; \
ITERATE_LISTENERS(listener->method args; \
if (!retval) { canceled = true; }); \
if (canceled) { \
retval = false; \
} \
} \
PR_END_MACRO
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;
mInitialIndex = aHistory->Index();
mInitialLength = aHistory->Length();
}
}
~SHistoryChangeNotifier() {
if (mSHistory) {
MOZ_ASSERT(mSHistory->HasOngoingUpdate());
mSHistory->SetHasOngoingUpdate(false);
if (mSHistory->GetBrowsingContext()) {
mSHistory->GetBrowsingContext()->SessionHistoryChanged(
mSHistory->Index() - mInitialIndex,
mSHistory->Length() - mInitialLength);
}
}
}
RefPtr<nsSHistory> mSHistory;
int32_t mInitialIndex;
int32_t mInitialLength;
};
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();
}
// 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),
mHasOngoingUpdate(false),
mIsRemote(false),
mIndex(-1),
mRequestedIndex(-1),
mRootDocShellID(aRootBC->GetHistoryID()) {
// Add this new SHistory object to the list
gSHistoryList.insertBack(this);
// Init mHistoryTracker on setting mRootBC so we can bind its event
// target to the tabGroup.
nsPIDOMWindowOuter* win;
if (mRootBC && (win = mRootBC->GetDOMWindow())) {
nsCOMPtr<nsIGlobalObject> global = do_QueryInterface(win);
mHistoryTracker = mozilla::MakeUnique<HistoryTracker>(
this,
mozilla::Preferences::GetUint(CONTENT_VIEWER_TIMEOUT_SECONDS,
CONTENT_VIEWER_TIMEOUT_SECONDS_DEFAULT),
global->EventTargetFor(mozilla::TaskCategory::Other));
}
}
nsSHistory::~nsSHistory() {}
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);
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, or we are in the parent process, update
// canonical BC directly
nsDocShell* docshell = static_cast<nsDocShell*>(child->GetDocShell());
if (docshell && docshell->HasHistoryEntry(childEntry)) {
childBC = docshell->GetBrowsingContext();
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;
}
NS_IMETHODIMP
nsSHistory::AddChildSHEntryHelper(nsISHEntry* aCloneRef, nsISHEntry* aNewEntry,
BrowsingContext* aBC, bool aCloneChildren) {
nsCOMPtr<nsISHEntry> child;
nsresult rv = AddChildSHEntryHelper(aCloneRef, aNewEntry, aBC, aCloneChildren,
getter_AddRefs(child));
if (NS_SUCCEEDED(rv)) {
child->SetDocshellID(aBC->GetHistoryID());
}
return rv;
}
nsresult nsSHistory::AddChildSHEntryHelper(nsISHEntry* aCloneRef,
nsISHEntry* aNewEntry,
BrowsingContext* aBC,
bool aCloneChildren,
nsISHEntry** aNextEntry) {
/* 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> 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, aBC, cloneID, aNewEntry,
aCloneChildren, aNextEntry);
if (NS_SUCCEEDED(rv)) {
rv = AddEntry(*aNextEntry, true);
}
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 = StaticPrefs::fission_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?
}
}
NS_IMETHODIMP
nsSHistory::AddToRootSessionHistory(bool aCloneChildren, nsISHEntry* aOSHE,
BrowsingContext* aBC, nsISHEntry* aEntry,
uint32_t aLoadType, bool aShouldPersist,
Maybe<int32_t>* aPreviousEntryIndex,
Maybe<int32_t>* aLoadedEntryIndex) {
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, aBC, 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 = mRequestedIndex;
if (index == -1) {
index = mIndex;
}
// 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(aBC->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
if (mRootBC) {
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()) {
NOTIFY_LISTENERS(OnHistoryReplaceEntry, ());
aSHEntry->SetPersist(aPersist);
mEntries[mIndex] = aSHEntry;
return NS_OK;
}
}
SHistoryChangeNotifier change(this);
nsCOMPtr<nsIURI> uri = aSHEntry->GetURI();
NOTIFY_LISTENERS(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++;
// Purge History list if it is too long
if (gHistoryMaxSize >= 0 && Length() > gHistoryMaxSize) {
PurgeHistory(Length() - gHistoryMaxSize);
}
return NS_OK;
}
/* 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;
}
#ifdef DEBUG
nsresult nsSHistory::PrintHistory() {
for (int32_t i = 0; i < Length(); i++) {
nsCOMPtr<nsISHEntry> entry = mEntries[i];
nsCOMPtr<nsILayoutHistoryState> layoutHistoryState =
entry->GetLayoutHistoryState();
nsCOMPtr<nsIURI> uri = entry->GetURI();
nsString title;
entry->GetTitle(title);
# if 0
nsAutoCString url;
if (uri) {
uri->GetSpec(url);
}
printf("**** SH Entry #%d: %x\n", i, entry.get());
printf("\t\t URL = %s\n", url.get());
printf("\t\t Title = %s\n", NS_LossyConvertUTF16toASCII(title).get());
printf("\t\t layout History Data = %x\n", layoutHistoryState.get());
# endif
}
return NS_OK;
}
#endif
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);
}
NS_IMETHODIMP
nsSHistory::PurgeHistory(int32_t aNumEntries) {
if (Length() <= 0 || aNumEntries <= 0) {
return NS_ERROR_FAILURE;
}
SHistoryChangeNotifier change(this);
aNumEntries = std::min(aNumEntries, Length());
NOTIFY_LISTENERS(OnHistoryPurge, ());
// 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 (mRootBC && mRootBC->GetDocShell()) {
mRootBC->GetDocShell()->HistoryPurged(aNumEntries);
}
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) {
NOTIFY_LISTENERS(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);
NOTIFY_LISTENERS(OnHistoryReplaceEntry, ());
aReplaceEntry->SetPersist(true);
mEntries[aIndex] = aReplaceEntry;
return NS_OK;
}
NS_IMETHODIMP
nsSHistory::NotifyOnHistoryReload(bool* aCanReload) {
NOTIFY_LISTENERS_CANCELABLE(OnHistoryReload, *aCanReload, (aCanReload));
return NS_OK;
}
NS_IMETHODIMP
nsSHistory::EvictOutOfRangeContentViewers(int32_t 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 nsSHistory::LoadURIs(nsTArray<LoadEntryResult>& aLoadResults) {
for (LoadEntryResult& loadEntry : aLoadResults) {
loadEntry.mBrowsingContext->LoadURI(loadEntry.mLoadState, false);
}
}
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 if (aReloadFlags & nsIWebNavigation::LOAD_FLAGS_ALLOW_MIXED_CONTENT) {
loadType = LOAD_RELOAD_ALLOW_MIXED_CONTENT;
} 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;
NOTIFY_LISTENERS_CANCELABLE(OnHistoryReload, canNavigate, (&canNavigate));
if (!canNavigate) {
return NS_OK;
}
nsresult rv = LoadEntry(mIndex, loadType, HIST_CMD_RELOAD, aLoadResults);
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
NOTIFY_LISTENERS(OnHistoryGotoIndex, ());
return LoadEntry(mIndex, LOAD_HISTORY, HIST_CMD_RELOAD, aLoadResults);
}
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;
for (int32_t i = startSafeIndex; i <= endSafeIndex; i++) {
nsCOMPtr<nsIContentViewer> viewer = mEntries[i]->GetContentViewer();
safeViewers.AppendObject(viewer);
}
// 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
// copy of Length(), because the length might change between iterations.)
for (int32_t i = 0; i < Length(); i++) {
nsCOMPtr<nsISHEntry> entry = mEntries[i];
nsCOMPtr<nsIContentViewer> viewer = entry->GetContentViewer();
if (safeViewers.IndexOf(viewer) == -1) {
EvictContentViewerForEntry(entry);
}
}
}
namespace {
class EntryAndDistance {
public:
EntryAndDistance(nsSHistory* aSHistory, nsISHEntry* aEntry, uint32_t aDist)
: mSHistory(aSHistory),
mEntry(aEntry),
mViewer(aEntry->GetContentViewer()),
mLastTouched(mEntry->GetLastTouched()),
mDistance(aDist) {
NS_ASSERTION(mViewer, "Entry should have a content viewer");
}
bool operator<(const EntryAndDistance& aOther) const {
// Compare distances first, and fall back to last-accessed times.
if (aOther.mDistance != this->mDistance) {
return this->mDistance < aOther.mDistance;
}
return this->mLastTouched < aOther.mLastTouched;
}
bool operator==(const EntryAndDistance& aOther) const {
// This is a little silly; we need == so the default comaprator can be
// instantiated, but this function is never actually called when we sort
// the list of EntryAndDistance objects.
return aOther.mDistance == this->mDistance &&
aOther.mLastTouched == this->mLastTouched;
}
RefPtr<nsSHistory> mSHistory;
nsCOMPtr<nsISHEntry> mEntry;
nsCOMPtr<nsIContentViewer> mViewer;
uint32_t mLastTouched;
int32_t mDistance;
};
} // namespace
// static
void nsSHistory::GloballyEvictContentViewers() {
// First, collect from each SHistory object the entries which have a cached
// content viewer. Associate with each entry its distance from its SHistory's
// current index.
nsTArray<EntryAndDistance> entries;
for (auto shist : gSHistoryList) {
// FIXME Bug 1546348: Make global eviction work for session history in the
// parent and remove mIsRemote.
if (shist->mIsRemote) {
continue;
}
// Maintain a list of the entries which have viewers and belong to
// this particular shist object. We'll add this list to the global list,
// |entries|, eventually.
nsTArray<EntryAndDistance> shEntries;
// Content viewers are likely to exist only within shist->mIndex -/+
// VIEWER_WINDOW, so only search within that range.
//
// A content viewer might exist outside that range due to either:
//
// * history.pushState or hash navigations, in which case a copy of the
// content viewer should exist within the range, or
//
// * bugs which cause us not to call nsSHistory::EvictContentViewers()
// often enough. Once we do call EvictContentViewers() for the
// SHistory object in question, we'll do a full search of its history
// and evict the out-of-range content viewers, so we don't bother here.
//
int32_t startIndex, endIndex;
shist->WindowIndices(shist->mIndex, &startIndex, &endIndex);
for (int32_t i = startIndex; i <= endIndex; i++) {
nsCOMPtr<nsISHEntry> entry = shist->mEntries[i];
nsCOMPtr<nsIContentViewer> contentViewer = entry->GetContentViewer();
if (contentViewer) {
// Because one content viewer might belong to multiple SHEntries, we
// have to search through shEntries to see if we already know
// about this content viewer. If we find the viewer, update its
// distance from the SHistory's index and continue.
bool found = false;
for (uint32_t j = 0; j < shEntries.Length(); j++) {
EntryAndDistance& container = shEntries[j];
if (container.mViewer == contentViewer) {
container.mDistance =
std::min(container.mDistance, DeprecatedAbs(i - shist->mIndex));
found = true;
break;
}
}
// If we didn't find a EntryAndDistance for this content viewer, make a
// new one.
if (!found) {
EntryAndDistance container(shist, entry,
DeprecatedAbs(i - shist->mIndex));
shEntries.AppendElement(container);
}
}
}
// We've found all the entries belonging to shist which have viewers.
// Add those entries to our global list and move on.
entries.AppendElements(shEntries);
}
// We now have collected all cached content viewers. First check that we
// have enough that we actually need to evict some.
if ((int32_t)entries.Length() <= sHistoryMaxTotalViewers) {
return;
}
// If we need to evict, sort our list of entries and evict the largest
// ones. (We could of course get better algorithmic complexity here by using
// a heap or something more clever. But sHistoryMaxTotalViewers isn't large,
// so let's not worry about it.)
entries.Sort();
for (int32_t i = entries.Length() - 1; i >= sHistoryMaxTotalViewers; --i) {
(entries[i].mSHistory)->EvictContentViewerForEntry(entries[i].mEntry);
}
}
nsresult nsSHistory::FindEntryForBFCache(nsIBFCacheEntry* aBFEntry,
nsISHEntry** aResult,
int32_t* aResultIndex) {
*aResult = nullptr;
*aResultIndex = -1;
int32_t startIndex, endIndex;
WindowIndices(mIndex, &startIndex, &endIndex);
for (int32_t i = startIndex; i <= endIndex; ++i) {
nsCOMPtr<nsISHEntry> shEntry = mEntries[i];
// Does shEntry have the same BFCacheEntry as the argument to this method?
if (shEntry->HasBFCacheEntry(aBFEntry)) {
shEntry.forget(aResult);
*aResultIndex = i;
return NS_OK;
}
}
return NS_ERROR_FAILURE;
}
nsresult nsSHistory::EvictExpiredContentViewerForEntry(
nsIBFCacheEntry* aBFEntry) {
int32_t index;
nsCOMPtr<nsISHEntry> shEntry;
FindEntryForBFCache(aBFEntry, getter_AddRefs(shEntry), &index);
if (index == mIndex) {
NS_WARNING("How did the current SHEntry expire?");
return NS_OK;
}
if (shEntry) {
EvictContentViewerForEntry(shEntry);
}
return NS_OK;
}
NS_IMETHODIMP_(void)
nsSHistory::AddToExpirationTracker(nsIBFCacheEntry* aBFEntry) {
RefPtr<nsSHEntryShared> entry = static_cast<nsSHEntryShared*>(aBFEntry);
if (!mHistoryTracker || !entry) {
return;
}
mHistoryTracker->AddObject(entry);
return;
}
NS_IMETHODIMP_(void)
nsSHistory::RemoveFromExpirationTracker(nsIBFCacheEntry* aBFEntry) {
RefPtr<nsSHEntryShared> entry = static_cast<nsSHEntryShared*>(aBFEntry);
MOZ_ASSERT(mHistoryTracker && !mHistoryTracker->IsEmpty());
if (!mHistoryTracker || !entry) {
return;
}
mHistoryTracker->RemoveObject(entry);
}
// Evicts all content viewers in all history objects. This is very
// inefficient, because it requires a linear search through all SHistory
// objects for each viewer to be evicted. However, this method is called
// infrequently -- only when the disk or memory cache is cleared.
// static
void nsSHistory::GloballyEvictAllContentViewers() {
int32_t maxViewers = sHistoryMaxTotalViewers;
sHistoryMaxTotalViewers = 0;
GloballyEvictContentViewers();
sHistoryMaxTotalViewers = maxViewers;
}
void GetDynamicChildren(nsISHEntry* aEntry, nsTArray<nsID>& aDocshellIDs) {
int32_t count = aEntry->GetChildCount();
for (int32_t i = 0; i < count; ++i) {
nsCOMPtr<nsISHEntry> child;
aEntry->GetChildAt(i, getter_AddRefs(child));
if (child) {
if (child->IsDynamicallyAdded()) {
child->GetDocshellID(*aDocshellIDs.AppendElement());
} else {
GetDynamicChildren(child, aDocshellIDs);
}
}
}
}
bool RemoveFromSessionHistoryEntry(nsISHEntry* aRoot,
nsTArray<nsID>& aDocshellIDs) {
bool didRemove = false;
int32_t childCount = aRoot->GetChildCount();
for (int32_t i = childCount - 1; i >= 0; --i) {
nsCOMPtr<nsISHEntry> child;
aRoot->GetChildAt(i, getter_AddRefs(child));
if (child) {
nsID docshelldID;
child->GetDocshellID(docshelldID);
if (aDocshellIDs.Contains(docshelldID)) {
didRemove = true;
aRoot->RemoveChild(child);
} else if (RemoveFromSessionHistoryEntry(child, aDocshellIDs)) {
didRemove = true;
}
}
}
return didRemove;
}
bool RemoveChildEntries(nsISHistory* aHistory, int32_t aIndex,
nsTArray<nsID>& aEntryIDs) {
nsCOMPtr<nsISHEntry> root;
aHistory->GetEntryAtIndex(aIndex, getter_AddRefs(root));
return root ? RemoveFromSessionHistoryEntry(root, aEntryIDs) : false;
}
bool IsSameTree(nsISHEntry* aEntry1, nsISHEntry* aEntry2) {
if (!aEntry1 && !aEntry2) {
return true;
}
if ((!aEntry1 && aEntry2) || (aEntry1 && !aEntry2)) {
return false;
}
uint32_t id1 = aEntry1->GetID();
uint32_t id2 = aEntry2->GetID();
if (id1 != id2) {
return false;
}
int32_t count1 = aEntry1->GetChildCount();
int32_t count2 = aEntry2->GetChildCount();
// We allow null entries in the end of the child list.
int32_t count = std::max(count1, count2);
for (int32_t i = 0; i < count; ++i) {
nsCOMPtr<nsISHEntry> child1, child2;
aEntry1->GetChildAt(i, getter_AddRefs(child1));
aEntry2->GetChildAt(i, getter_AddRefs(child2));
if (!IsSameTree(child1, child2)) {
return false;
}
}
return true;
}
bool nsSHistory::RemoveDuplicate(int32_t aIndex, bool aKeepNext) {
NS_ASSERTION(aIndex >= 0, "aIndex must be >= 0!");
NS_ASSERTION(aIndex != 0 || aKeepNext,
"If we're removing index 0 we must be keeping the next");
NS_ASSERTION(aIndex != mIndex, "Shouldn't remove mIndex!");
int32_t compareIndex = aKeepNext ? aIndex + 1 : aIndex - 1;
nsresult rv;
nsCOMPtr<nsISHEntry> root1, root2;
rv = GetEntryAtIndex(aIndex, getter_AddRefs(root1));
if (NS_FAILED(rv)) {
return false;
}
rv = GetEntryAtIndex(compareIndex, getter_AddRefs(root2));
if (NS_FAILED(rv)) {
return false;
}
SHistoryChangeNotifier change(this);
if (IsSameTree(root1, root2)) {
mEntries.RemoveElementAt(aIndex);
// FIXME Bug 1546350: Reimplement history listeners.
// if (mRootBC && mRootBC->GetDocShell()) {
// static_cast<nsDocShell*>(mRootBC->GetDocShell())
// ->HistoryEntryRemoved(aIndex);
//}
// Adjust our indices to reflect the removed entry.
if (mIndex > aIndex) {
mIndex = mIndex - 1;
}
// NB: If the entry we are removing is the entry currently
// being navigated to (mRequestedIndex) then we adjust the index
// only if we're not keeping the next entry (because if we are keeping
// the next entry (because the current is a duplicate of the next), then
// that entry slides into the spot that we're currently pointing to.
// We don't do this adjustment for mIndex because mIndex cannot equal
// aIndex.
// NB: We don't need to guard on mRequestedIndex being nonzero here,
// because either they're strictly greater than aIndex which is at least
// zero, or they are equal to aIndex in which case aKeepNext must be true
// if aIndex is zero.
if (mRequestedIndex > aIndex || (mRequestedIndex == aIndex && !aKeepNext)) {
mRequestedIndex = mRequestedIndex - 1;
}
return true;
}
return false;
}
NS_IMETHODIMP_(void)
nsSHistory::RemoveEntries(nsTArray<nsID>& aIDs, int32_t aStartIndex) {
bool didRemove;
RemoveEntries(aIDs, aStartIndex, &didRemove);
if (didRemove && mRootBC && mRootBC->GetDocShell()) {
mRootBC->GetDocShell()->DispatchLocationChangeEvent();
}
}
void nsSHistory::RemoveEntries(nsTArray<nsID>& aIDs, int32_t aStartIndex,
bool* aDidRemove) {
SHistoryChangeNotifier change(this);
int32_t index = aStartIndex;
while (index >= 0 && RemoveChildEntries(this, --index, aIDs)) {
}
int32_t minIndex = index;
index = aStartIndex;
while (index >= 0 && RemoveChildEntries(this, index++, aIDs)) {
}
// We need to remove duplicate nsSHEntry trees.
*aDidRemove = false;
while (index > minIndex) {
if (index != mIndex && RemoveDuplicate(index, index < mIndex)) {
*aDidRemove = true;
}
--index;
}
}
void nsSHistory::RemoveFrameEntries(nsISHEntry* aEntry) {
int32_t count = aEntry->GetChildCount();
AutoTArray<nsID, 16> ids;
for (int32_t i = 0; i < count; ++i) {
nsCOMPtr<nsISHEntry> child;
aEntry->GetChildAt(i, getter_AddRefs(child));
if (child) {
child->GetDocshellID(*ids.AppendElement());
}
}
RemoveEntries(ids, mIndex);
}
void nsSHistory::RemoveDynEntries(int32_t aIndex, nsISHEntry* aEntry) {
// Remove dynamic entries which are at the index and belongs to the container.
nsCOMPtr<nsISHEntry> entry(aEntry);
if (!entry) {
GetEntryAtIndex(aIndex, getter_AddRefs(entry));
}
if (entry) {
AutoTArray<nsID, 16> toBeRemovedEntries;
GetDynamicChildren(entry, toBeRemovedEntries);
if (toBeRemovedEntries.Length()) {
RemoveEntries(toBeRemovedEntries, aIndex);
}
}
}
void nsSHistory::RemoveDynEntriesForBFCacheEntry(nsIBFCacheEntry* aBFEntry) {
int32_t index;
nsCOMPtr<nsISHEntry> shEntry;
FindEntryForBFCache(aBFEntry, getter_AddRefs(shEntry), &index);
if (shEntry) {
RemoveDynEntries(index, shEntry);
}
}
NS_IMETHODIMP
nsSHistory::UpdateIndex() {
SHistoryChangeNotifier change(this);
// Update the actual index with the right value.
if (mIndex != mRequestedIndex && mRequestedIndex != -1) {
mIndex = mRequestedIndex;
}
mRequestedIndex = -1;
return NS_OK;
}
NS_IMETHODIMP
nsSHistory::GotoIndex(int32_t aIndex) {
nsTArray<LoadEntryResult> loadResults;
nsresult rv = GotoIndex(aIndex, loadResults);
NS_ENSURE_SUCCESS(rv, rv);
LoadURIs(loadResults);
return NS_OK;
}
NS_IMETHODIMP_(void)
nsSHistory::EnsureCorrectEntryAtCurrIndex(nsISHEntry* aEntry) {
int index = mRequestedIndex == -1 ? mIndex : mRequestedIndex;
if (index > -1 && (mEntries[index] != aEntry)) {
ReplaceEntry(index, aEntry);
}
}
nsresult nsSHistory::GotoIndex(int32_t aIndex,
nsTArray<LoadEntryResult>& aLoadResults) {
return LoadEntry(aIndex, LOAD_HISTORY, HIST_CMD_GOTOINDEX, aLoadResults);
}
NS_IMETHODIMP_(bool)
nsSHistory::HasUserInteractionAtIndex(int32_t aIndex) {
nsCOMPtr<nsISHEntry> entry;
GetEntryAtIndex(aIndex, getter_AddRefs(entry));
if (!entry) {
return false;
}
return entry->GetHasUserInteraction();
}
nsresult nsSHistory::LoadNextPossibleEntry(
int32_t aNewIndex, long aLoadType, uint32_t aHistCmd,
nsTArray<LoadEntryResult>& aLoadResults) {
mRequestedIndex = -1;
if (aNewIndex < mIndex) {
return LoadEntry(aNewIndex - 1, aLoadType, aHistCmd, aLoadResults);
}
if (aNewIndex > mIndex) {
return LoadEntry(aNewIndex + 1, aLoadType, aHistCmd, aLoadResults);
}
return NS_ERROR_FAILURE;
}
nsresult nsSHistory::LoadEntry(int32_t aIndex, long aLoadType,
uint32_t aHistCmd,
nsTArray<LoadEntryResult>& aLoadResults) {
if (!mRootBC) {
return NS_ERROR_FAILURE;
}
if (aIndex < 0 || aIndex >= Length()) {
// The index is out of range
return NS_ERROR_FAILURE;
}
// This is a normal local history navigation.
// Keep note of requested history index in mRequestedIndex.
mRequestedIndex = aIndex;
nsCOMPtr<nsISHEntry> prevEntry;
nsCOMPtr<nsISHEntry> nextEntry;
GetEntryAtIndex(mIndex, getter_AddRefs(prevEntry));
GetEntryAtIndex(mRequestedIndex, getter_AddRefs(nextEntry));
if (!nextEntry || !prevEntry) {
mRequestedIndex = -1;
return NS_ERROR_FAILURE;
}
// Remember that this entry is getting loaded at this point in the sequence
nextEntry->SetLastTouched(++gTouchCounter);
// Get the uri for the entry we are about to visit
nsCOMPtr<nsIURI> nextURI = nextEntry->GetURI();
MOZ_ASSERT(nextURI, "nextURI can't be null");
// Send appropriate listener notifications.
if (aHistCmd == HIST_CMD_GOTOINDEX) {
// We are going somewhere else. This is not reload either
NOTIFY_LISTENERS(OnHistoryGotoIndex, ());
}
if (mRequestedIndex == mIndex) {
// Possibly a reload case
InitiateLoad(nextEntry, mRootBC, aLoadType, aLoadResults);
return NS_OK;
}
// Going back or forward.
bool differenceFound = LoadDifferingEntries(prevEntry, nextEntry, mRootBC,
aLoadType, aLoadResults);
if (!differenceFound) {
// We did not find any differences. Go further in the history.
return LoadNextPossibleEntry(aIndex, aLoadType, aHistCmd, aLoadResults);
}
return NS_OK;
}
bool nsSHistory::LoadDifferingEntries(nsISHEntry* aPrevEntry,
nsISHEntry* aNextEntry,
BrowsingContext* aParent, long aLoadType,
nsTArray<LoadEntryResult>& aLoadResults) {
MOZ_ASSERT(aPrevEntry && aNextEntry && aParent);
uint32_t prevID = aPrevEntry->GetID();
uint32_t nextID = aNextEntry->GetID();
// Check the IDs to verify if the pages are different.
if (prevID != nextID) {
// Set the Subframe flag if not navigating the root docshell.
aNextEntry->SetIsSubFrame(aParent != mRootBC);
InitiateLoad(aNextEntry, aParent, aLoadType, aLoadResults);
return true;
}
// The entries are the same, so compare any child frames
int32_t pcnt = aPrevEntry->GetChildCount();
int32_t ncnt = aNextEntry->GetChildCount();
// Create an array for child browsing contexts.
nsTArray<RefPtr<BrowsingContext>> browsingContexts;
aParent->GetChildren(browsingContexts);
// Search for something to load next.
bool differenceFound = false;
for (int32_t i = 0; i < ncnt; ++i) {
// First get an entry which may cause a new page to be loaded.
nsCOMPtr<nsISHEntry> nChild;
aNextEntry->GetChildAt(i, getter_AddRefs(nChild));
if (!nChild) {
continue;
}
nsID docshellID;
nChild->GetDocshellID(docshellID);
// Then find the associated docshell.
RefPtr<BrowsingContext> bcChild;
for (const RefPtr<BrowsingContext>& bc : browsingContexts) {
if (bc->GetHistoryID() == docshellID) {
bcChild = bc;
break;
}
}
if (!bcChild) {
continue;
}
// Then look at the previous entries to see if there was
// an entry for the docshell.
nsCOMPtr<nsISHEntry> pChild;
for (int32_t k = 0; k < pcnt; ++k) {
nsCOMPtr<nsISHEntry> child;
aPrevEntry->GetChildAt(k, getter_AddRefs(child));
if (child) {
nsID dID;
child->GetDocshellID(dID);
if (dID == docshellID) {
pChild = child;
break;
}
}
}
if (!pChild) {
continue;
}
// Finally recursively call this method.
// This will either load a new page to shell or some subshell or
// do nothing.
if (LoadDifferingEntries(pChild, nChild, bcChild, aLoadType,
aLoadResults)) {
differenceFound = true;
}
}
return differenceFound;
}
void nsSHistory::InitiateLoad(nsISHEntry* aFrameEntry,
BrowsingContext* aFrameBC, long aLoadType,
nsTArray<LoadEntryResult>& aLoadResults) {
MOZ_ASSERT(aFrameBC && aFrameEntry);
LoadEntryResult* loadResult = aLoadResults.AppendElement();
loadResult->mBrowsingContext = aFrameBC;
nsCOMPtr<nsIURI> newURI = aFrameEntry->GetURI();
RefPtr<nsDocShellLoadState> loadState = new nsDocShellLoadState(newURI);
/* Set the loadType in the SHEntry too to what was passed on.
* This will be passed on to child subframes later in nsDocShell,
* so that proper loadType is maintained through out a frameset
*/
aFrameEntry->SetLoadType(aLoadType);
loadState->SetLoadType(aLoadType);
loadState->SetSHEntry(aFrameEntry);
nsCOMPtr<nsIURI> originalURI = aFrameEntry->GetOriginalURI();
loadState->SetOriginalURI(originalURI);
loadState->SetLoadReplace(aFrameEntry->GetLoadReplace());
loadState->SetLoadFlags(nsIWebNavigation::LOAD_FLAGS_NONE);
nsCOMPtr<nsIPrincipal> triggeringPrincipal =
aFrameEntry->GetTriggeringPrincipal();
loadState->SetTriggeringPrincipal(triggeringPrincipal);
loadState->SetFirstParty(false);
nsCOMPtr<nsIContentSecurityPolicy> csp = aFrameEntry->GetCsp();
loadState->SetCsp(csp);
loadResult->mLoadState = std::move(loadState);
}
NS_IMETHODIMP
nsSHistory::CreateEntry(nsISHEntry** aEntry) {
nsCOMPtr<nsISHEntry> entry = new nsSHEntry();
entry.forget(aEntry);
return NS_OK;
}
NS_IMETHODIMP_(bool)
nsSHistory::IsEmptyOrHasEntriesForSingleTopLevelPage() {
if (mEntries.IsEmpty()) {
return true;
}
nsISHEntry* entry = mEntries[0];
size_t length = mEntries.Length();
for (size_t i = 1; i < length; ++i) {
bool sharesDocument = false;
mEntries[i]->SharesDocumentWith(entry, &sharesDocument);
if (!sharesDocument) {
return false;
}
}
return true;
}
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