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Bug 1406161 - Part 6: Move shistory related static functions to nsSHistory. r=smaug 

MozReview-Commit-ID: 7rqo2rISCB5

--HG--
extra : rebase_source : 3de7a21b24ce526f45424a2f1aad4329a8758f78
This commit is contained in:
Samael Wang 2017-12-19 18:26:36 +08:00
Родитель 3899149f41
Коммит 112d2693c3
4 изменённых файлов: 289 добавлений и 278 удалений
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236
docshell/base/nsDocShell.cpp
Просмотреть файл

@ -282,8 +282,6 @@ FavorPerformanceHint(bool aPerfOverStarvation)
}
}
static nsISHEntry* GetRootSHEntry(nsISHEntry* aEntry);
static void
IncreasePrivateDocShellCount()
{
@ -3977,8 +3975,8 @@ nsDocShell::AddChildSHEntryInternal(nsISHEntry* aCloneRef,
uint32_t cloneID = 0;
nsCOMPtr<nsISHEntry> nextEntry;
aCloneRef->GetID(&cloneID);
rv = CloneAndReplace(currentEntry, this, cloneID, aNewEntry,
aCloneChildren, getter_AddRefs(nextEntry));
rv = nsSHistory::CloneAndReplace(currentEntry, this, cloneID,
aNewEntry, aCloneChildren, getter_AddRefs(nextEntry));
if (NS_SUCCEEDED(rv)) {
nsCOMPtr<nsISHistoryInternal> shPrivate =
@ -11966,7 +11964,7 @@ nsDocShell::AddState(JS::Handle<JS::Value> aData, const nsAString& aTitle,
internalSH->EvictOutOfRangeContentViewers(curIndex);
}
} else {
nsCOMPtr<nsISHEntry> rootSHEntry = GetRootSHEntry(newSHEntry);
nsCOMPtr<nsISHEntry> rootSHEntry = nsSHistory::GetRootSHEntry(newSHEntry);
int32_t index = -1;
rv = rootSH->GetIndexOfEntry(rootSHEntry, &index);
@ -12266,8 +12264,8 @@ nsDocShell::AddToSessionHistory(nsIURI* aURI, nsIChannel* aChannel,
uint32_t cloneID;
mOSHE->GetID(&cloneID);
nsCOMPtr<nsISHEntry> newEntry;
CloneAndReplace(mOSHE, this, cloneID, entry, true,
getter_AddRefs(newEntry));
nsSHistory::CloneAndReplace(mOSHE, this, cloneID, entry, true,
getter_AddRefs(newEntry));
NS_ASSERTION(entry == newEntry,
"The new session history should be in the new entry");
}
@ -12512,144 +12510,6 @@ nsDocShell::PersistLayoutHistoryState()
return rv;
}
/* static */ nsresult
nsDocShell::WalkHistoryEntries(nsISHEntry* aRootEntry,
nsDocShell* aRootShell,
WalkHistoryEntriesFunc aCallback,
void* aData)
{
NS_ENSURE_TRUE(aRootEntry, NS_ERROR_FAILURE);
nsCOMPtr<nsISHContainer> container(do_QueryInterface(aRootEntry));
if (!container) {
return NS_ERROR_FAILURE;
}
int32_t childCount;
container->GetChildCount(&childCount);
for (int32_t i = 0; i < childCount; i++) {
nsCOMPtr<nsISHEntry> childEntry;
container->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;
}
nsDocShell* childShell = nullptr;
if (aRootShell) {
// Walk the children of aRootShell and see if one of them
// has srcChild as a SHEntry.
nsTObserverArray<nsDocLoader*>::ForwardIterator iter(
aRootShell->mChildList);
while (iter.HasMore()) {
nsDocShell* child = static_cast<nsDocShell*>(iter.GetNext());
if (child->HasHistoryEntry(childEntry)) {
childShell = child;
break;
}
}
}
nsresult rv = aCallback(childEntry, childShell, 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;
};
/* static */ nsresult
nsDocShell::CloneAndReplaceChild(nsISHEntry* aEntry, nsDocShell* aShell,
int32_t aEntryIndex, void* aData)
{
nsCOMPtr<nsISHEntry> dest;
CloneAndReplaceData* data = static_cast<CloneAndReplaceData*>(aData);
uint32_t cloneID = data->cloneID;
nsISHEntry* replaceEntry = data->replaceEntry;
nsCOMPtr<nsISHContainer> container = do_QueryInterface(data->destTreeParent);
if (!aEntry) {
if (container) {
container->AddChild(nullptr, aEntryIndex);
}
return NS_OK;
}
uint32_t srcID;
aEntry->GetID(&srcID);
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 = WalkHistoryEntries(aEntry, aShell,
CloneAndReplaceChild, &childData);
NS_ENSURE_SUCCESS(rv, rv);
}
if (srcID != cloneID && aShell) {
aShell->SwapHistoryEntries(aEntry, dest);
}
if (container) {
container->AddChild(dest, aEntryIndex);
}
data->resultEntry = dest;
return rv;
}
/* static */ nsresult
nsDocShell::CloneAndReplace(nsISHEntry* aSrcEntry,
nsDocShell* aSrcShell,
uint32_t aCloneID,
nsISHEntry* aReplaceEntry,
bool aCloneChildren,
nsISHEntry** aResultEntry)
{
NS_ENSURE_ARG_POINTER(aResultEntry);
NS_ENSURE_TRUE(aReplaceEntry, NS_ERROR_FAILURE);
CloneAndReplaceData data(aCloneID, aReplaceEntry, aCloneChildren, nullptr);
nsresult rv = CloneAndReplaceChild(aSrcEntry, aSrcShell, 0, &data);
data.resultEntry.swap(*aResultEntry);
return rv;
}
void
nsDocShell::SwapHistoryEntries(nsISHEntry* aOldEntry, nsISHEntry* aNewEntry)
{
@ -12662,84 +12522,6 @@ nsDocShell::SwapHistoryEntries(nsISHEntry* aOldEntry, nsISHEntry* aNewEntry)
}
}
struct SwapEntriesData
{
nsDocShell* ignoreShell; // constant; the shell to ignore
nsISHEntry* destTreeRoot; // constant; the root of the dest tree
nsISHEntry* destTreeParent; // constant; the node under destTreeRoot
// whose children will correspond to aEntry
};
nsresult
nsDocShell::SetChildHistoryEntry(nsISHEntry* aEntry, nsDocShell* aShell,
int32_t aEntryIndex, void* aData)
{
SwapEntriesData* data = static_cast<SwapEntriesData*>(aData);
nsDocShell* ignoreShell = data->ignoreShell;
if (!aShell || aShell == ignoreShell) {
return NS_OK;
}
nsISHEntry* destTreeRoot = data->destTreeRoot;
nsCOMPtr<nsISHEntry> destEntry;
nsCOMPtr<nsISHContainer> container = do_QueryInterface(data->destTreeParent);
if (container) {
// 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, id;
aEntry->GetID(&targetID);
// First look at the given index, since this is the common case.
nsCOMPtr<nsISHEntry> entry;
container->GetChildAt(aEntryIndex, getter_AddRefs(entry));
if (entry && NS_SUCCEEDED(entry->GetID(&id)) && id == targetID) {
destEntry.swap(entry);
} else {
int32_t childCount;
container->GetChildCount(&childCount);
for (int32_t i = 0; i < childCount; ++i) {
container->GetChildAt(i, getter_AddRefs(entry));
if (!entry) {
continue;
}
entry->GetID(&id);
if (id == targetID) {
destEntry.swap(entry);
break;
}
}
}
} else {
destEntry = destTreeRoot;
}
aShell->SwapHistoryEntries(aEntry, destEntry);
// Now handle the children of aEntry.
SwapEntriesData childData = { ignoreShell, destTreeRoot, destEntry };
return WalkHistoryEntries(aEntry, aShell, SetChildHistoryEntry, &childData);
}
static nsISHEntry*
GetRootSHEntry(nsISHEntry* aEntry)
{
nsCOMPtr<nsISHEntry> rootEntry = aEntry;
nsISHEntry* result = nullptr;
while (rootEntry) {
result = rootEntry;
result->GetParent(getter_AddRefs(rootEntry));
}
return result;
}
void
nsDocShell::SetHistoryEntry(nsCOMPtr<nsISHEntry>* aPtr, nsISHEntry* aEntry)
{
@ -12750,27 +12532,27 @@ nsDocShell::SetHistoryEntry(nsCOMPtr<nsISHEntry>* aPtr, nsISHEntry* aEntry)
// If we don't do this, then we can cache a content viewer on the wrong
// cloned entry, and subsequently restore it at the wrong time.
nsISHEntry* newRootEntry = GetRootSHEntry(aEntry);
nsISHEntry* newRootEntry = nsSHistory::GetRootSHEntry(aEntry);
if (newRootEntry) {
// newRootEntry is now the new root entry.
// Find the old root entry as well.
// Need a strong ref. on |oldRootEntry| so it isn't destroyed when
// SetChildHistoryEntry() does SwapHistoryEntries() (bug 304639).
nsCOMPtr<nsISHEntry> oldRootEntry = GetRootSHEntry(*aPtr);
nsCOMPtr<nsISHEntry> oldRootEntry = nsSHistory::GetRootSHEntry(*aPtr);
if (oldRootEntry) {
nsCOMPtr<nsIDocShellTreeItem> rootAsItem;
GetSameTypeRootTreeItem(getter_AddRefs(rootAsItem));
nsCOMPtr<nsIDocShell> rootShell = do_QueryInterface(rootAsItem);
if (rootShell) { // if we're the root just set it, nothing to swap
SwapEntriesData data = { this, newRootEntry };
nsSHistory::SwapEntriesData data = { this, newRootEntry };
nsIDocShell* rootIDocShell = static_cast<nsIDocShell*>(rootShell);
nsDocShell* rootDocShell = static_cast<nsDocShell*>(rootIDocShell);
#ifdef DEBUG
nsresult rv =
#endif
SetChildHistoryEntry(oldRootEntry, rootDocShell, 0, &data);
nsSHistory::SetChildHistoryEntry(oldRootEntry, rootDocShell, 0, &data);
NS_ASSERTION(NS_SUCCEEDED(rv), "SetChildHistoryEntry failed");
}
}

61
docshell/base/nsDocShell.h
Просмотреть файл

@ -357,6 +357,16 @@ public:
return mOriginAttributes;
}
// Determine whether this docshell corresponds to the given history entry,
// via having a pointer to it in mOSHE or mLSHE.
bool HasHistoryEntry(nsISHEntry* aEntry) const
{
return aEntry && (aEntry == mOSHE || aEntry == mLSHE);
}
// Update any pointers (mOSHE or mLSHE) to aOldEntry to point to aNewEntry
void SwapHistoryEntries(nsISHEntry* aOldEntry, nsISHEntry* aNewEntry);
static bool SandboxFlagsImplyCookies(const uint32_t &aSandboxFlags);
// Tell the favicon service that aNewURI has the same favicon as aOldURI.
@ -392,47 +402,6 @@ private: // member functions
friend void mozilla::TimelineConsumers::PopMarkers(nsDocShell*,
JSContext*, nsTArray<dom::ProfileTimelineMarker>&);
// Callback prototype for WalkHistoryEntries.
// aEntry is the child history entry, aShell is its corresponding docshell,
// aChildIndex is the child's index in its parent entry, and aData is
// the opaque pointer passed to WalkHistoryEntries.
typedef nsresult(*WalkHistoryEntriesFunc)(nsISHEntry* aEntry,
nsDocShell* aShell,
int32_t aChildIndex,
void* aData);
// Clone a session history tree for subframe navigation.
// The tree rooted at |aSrcEntry| will be cloned into |aDestEntry|, except
// for the entry with id |aCloneID|, which will be replaced with
// |aReplaceEntry|. |aSrcShell| is a (possibly null) docshell which
// corresponds to |aSrcEntry| via its mLSHE or mOHE pointers, and will
// have that pointer updated to point to the cloned history entry.
// If aCloneChildren is true then the children of the entry with id
// |aCloneID| will be cloned into |aReplaceEntry|.
static nsresult CloneAndReplace(nsISHEntry* aSrcEntry,
nsDocShell* aSrcShell,
uint32_t aCloneID,
nsISHEntry* aReplaceEntry,
bool aCloneChildren,
nsISHEntry** aDestEntry);
// Child-walking callback for CloneAndReplace
static nsresult CloneAndReplaceChild(nsISHEntry* aEntry, nsDocShell* aShell,
int32_t aChildIndex, void* aData);
// Child-walking callback for SetHistoryEntry
static nsresult SetChildHistoryEntry(nsISHEntry* aEntry, nsDocShell* aShell,
int32_t aEntryIndex, void* aData);
// For each child of aRootEntry, find the corresponding docshell which is
// a child of aRootShell, and call aCallback. The opaque pointer aData
// is passed to the callback.
static nsresult WalkHistoryEntries(nsISHEntry* aRootEntry,
nsDocShell* aRootShell,
WalkHistoryEntriesFunc aCallback,
void* aData);
// Security checks to prevent frameset spoofing. See comments at
// implementation sites.
static bool CanAccessItem(nsIDocShellTreeItem* aTargetItem,
@ -528,16 +497,6 @@ private: // member functions
int32_t aChildOffset, uint32_t aLoadType,
bool aCloneChildren);
// Determine whether this docshell corresponds to the given history entry,
// via having a pointer to it in mOSHE or mLSHE.
bool HasHistoryEntry(nsISHEntry* aEntry) const
{
return aEntry && (aEntry == mOSHE || aEntry == mLSHE);
}
// Update any pointers (mOSHE or mLSHE) to aOldEntry to point to aNewEntry
void SwapHistoryEntries(nsISHEntry* aOldEntry, nsISHEntry* aNewEntry);
// Call this method to swap in a new history entry to m[OL]SHE, rather than
// setting it directly. This completes the navigation in all docshells
// in the case of a subframe navigation.

217
docshell/shistory/nsSHistory.cpp
Просмотреть файл

@ -377,6 +377,223 @@ nsSHistory::Shutdown()
}
}
// static
nsISHEntry*
nsSHistory::GetRootSHEntry(nsISHEntry* aEntry)
{
nsCOMPtr<nsISHEntry> rootEntry = aEntry;
nsISHEntry* result = nullptr;
while (rootEntry) {
result = rootEntry;
result->GetParent(getter_AddRefs(rootEntry));
}
return result;
}
// static
nsresult
nsSHistory::WalkHistoryEntries(nsISHEntry* aRootEntry,
nsDocShell* aRootShell,
WalkHistoryEntriesFunc aCallback,
void* aData)
{
NS_ENSURE_TRUE(aRootEntry, NS_ERROR_FAILURE);
nsCOMPtr<nsISHContainer> container(do_QueryInterface(aRootEntry));
if (!container) {
return NS_ERROR_FAILURE;
}
int32_t childCount;
container->GetChildCount(&childCount);
for (int32_t i = 0; i < childCount; i++) {
nsCOMPtr<nsISHEntry> childEntry;
container->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;
}
nsDocShell* childShell = nullptr;
if (aRootShell) {
// Walk the children of aRootShell and see if one of them
// has srcChild as a SHEntry.
int32_t length;
aRootShell->GetChildCount(&length);
for (int32_t i = 0; i < length; i++) {
nsCOMPtr<nsIDocShellTreeItem> item;
nsresult rv = aRootShell->GetChildAt(i, getter_AddRefs(item));
NS_ENSURE_SUCCESS(rv, rv);
nsDocShell* child = static_cast<nsDocShell*>(item.get());
if (child->HasHistoryEntry(childEntry)) {
childShell = child;
break;
}
}
}
nsresult rv = aCallback(childEntry, childShell, 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;
};
// static
nsresult
nsSHistory::CloneAndReplaceChild(nsISHEntry* aEntry,
nsDocShell* aShell,
int32_t aEntryIndex,
void* aData)
{
nsCOMPtr<nsISHEntry> dest;
CloneAndReplaceData* data = static_cast<CloneAndReplaceData*>(aData);
uint32_t cloneID = data->cloneID;
nsISHEntry* replaceEntry = data->replaceEntry;
nsCOMPtr<nsISHContainer> container = do_QueryInterface(data->destTreeParent);
if (!aEntry) {
if (container) {
container->AddChild(nullptr, aEntryIndex);
}
return NS_OK;
}
uint32_t srcID;
aEntry->GetID(&srcID);
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 = WalkHistoryEntries(aEntry, aShell,
CloneAndReplaceChild, &childData);
NS_ENSURE_SUCCESS(rv, rv);
}
if (srcID != cloneID && aShell) {
aShell->SwapHistoryEntries(aEntry, dest);
}
if (container) {
container->AddChild(dest, aEntryIndex);
}
data->resultEntry = dest;
return rv;
}
// static
nsresult
nsSHistory::CloneAndReplace(nsISHEntry* aSrcEntry,
nsDocShell* aSrcShell,
uint32_t aCloneID,
nsISHEntry* aReplaceEntry,
bool aCloneChildren,
nsISHEntry** aResultEntry)
{
NS_ENSURE_ARG_POINTER(aResultEntry);
NS_ENSURE_TRUE(aReplaceEntry, NS_ERROR_FAILURE);
CloneAndReplaceData data(aCloneID, aReplaceEntry, aCloneChildren, nullptr);
nsresult rv = CloneAndReplaceChild(aSrcEntry, aSrcShell, 0, &data);
data.resultEntry.swap(*aResultEntry);
return rv;
}
// static
nsresult
nsSHistory::SetChildHistoryEntry(nsISHEntry* aEntry, nsDocShell* aShell,
int32_t aEntryIndex, void* aData)
{
SwapEntriesData* data = static_cast<SwapEntriesData*>(aData);
nsDocShell* ignoreShell = data->ignoreShell;
if (!aShell || aShell == ignoreShell) {
return NS_OK;
}
nsISHEntry* destTreeRoot = data->destTreeRoot;
nsCOMPtr<nsISHEntry> destEntry;
nsCOMPtr<nsISHContainer> container = do_QueryInterface(data->destTreeParent);
if (container) {
// 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, id;
aEntry->GetID(&targetID);
// First look at the given index, since this is the common case.
nsCOMPtr<nsISHEntry> entry;
container->GetChildAt(aEntryIndex, getter_AddRefs(entry));
if (entry && NS_SUCCEEDED(entry->GetID(&id)) && id == targetID) {
destEntry.swap(entry);
} else {
int32_t childCount;
container->GetChildCount(&childCount);
for (int32_t i = 0; i < childCount; ++i) {
container->GetChildAt(i, getter_AddRefs(entry));
if (!entry) {
continue;
}
entry->GetID(&id);
if (id == targetID) {
destEntry.swap(entry);
break;
}
}
}
} else {
destEntry = destTreeRoot;
}
aShell->SwapHistoryEntries(aEntry, destEntry);
// Now handle the children of aEntry.
SwapEntriesData childData = { ignoreShell, destTreeRoot, destEntry };
return WalkHistoryEntries(aEntry, aShell, SetChildHistoryEntry, &childData);
}
/* Add an entry to the History list at mIndex and
* increment the index to point to the new entry
*/

53
docshell/shistory/nsSHistory.h
Просмотреть файл

@ -61,6 +61,15 @@ public:
nsSHistory* mSHistory;
};
// Structure used in SetChildHistoryEntry
struct SwapEntriesData
{
nsDocShell* ignoreShell; // constant; the shell to ignore
nsISHEntry* destTreeRoot; // constant; the root of the dest tree
nsISHEntry* destTreeParent; // constant; the node under destTreeRoot
// whose children will correspond to aEntry
};
nsSHistory();
NS_DECL_ISUPPORTS
NS_DECL_NSISHISTORY
@ -78,6 +87,50 @@ public:
// Otherwise, it comes straight from the pref.
static uint32_t GetMaxTotalViewers() { return sHistoryMaxTotalViewers; }
// Get the root SHEntry from a given entry.
static nsISHEntry* GetRootSHEntry(nsISHEntry* aEntry);
// Callback prototype for WalkHistoryEntries.
// aEntry is the child history entry, aShell is its corresponding docshell,
// aChildIndex is the child's index in its parent entry, and aData is
// the opaque pointer passed to WalkHistoryEntries.
typedef nsresult(*WalkHistoryEntriesFunc)(nsISHEntry* aEntry,
nsDocShell* aShell,
int32_t aChildIndex,
void* aData);
// Clone a session history tree for subframe navigation.
// The tree rooted at |aSrcEntry| will be cloned into |aDestEntry|, except
// for the entry with id |aCloneID|, which will be replaced with
// |aReplaceEntry|. |aSrcShell| is a (possibly null) docshell which
// corresponds to |aSrcEntry| via its mLSHE or mOHE pointers, and will
// have that pointer updated to point to the cloned history entry.
// If aCloneChildren is true then the children of the entry with id
// |aCloneID| will be cloned into |aReplaceEntry|.
static nsresult CloneAndReplace(nsISHEntry* aSrcEntry,
nsDocShell* aSrcShell,
uint32_t aCloneID,
nsISHEntry* aReplaceEntry,
bool aCloneChildren,
nsISHEntry** aDestEntry);
// Child-walking callback for CloneAndReplace
static nsresult CloneAndReplaceChild(nsISHEntry* aEntry, nsDocShell* aShell,
int32_t aChildIndex, void* aData);
// Child-walking callback for SetHistoryEntry
static nsresult SetChildHistoryEntry(nsISHEntry* aEntry, nsDocShell* aShell,
int32_t aEntryIndex, void* aData);
// For each child of aRootEntry, find the corresponding docshell which is
// a child of aRootShell, and call aCallback. The opaque pointer aData
// is passed to the callback.
static nsresult WalkHistoryEntries(nsISHEntry* aRootEntry,
nsDocShell* aRootShell,
WalkHistoryEntriesFunc aCallback,
void* aData);
private:
virtual ~nsSHistory();
friend class nsSHEnumerator;