gecko-dev/dom/base/nsNodeInfoManager.cpp

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C++

/* -*- 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/. */
/*
* A class for handing out nodeinfos and ensuring sharing of them as needed.
*/
#include "nsNodeInfoManager.h"
#include "mozilla/DebugOnly.h"
#include "mozilla/dom/NodeInfo.h"
#include "mozilla/dom/NodeInfoInlines.h"
#include "mozilla/NullPrincipal.h"
#include "nsCOMPtr.h"
#include "nsString.h"
#include "nsAtom.h"
#include "nsIDocument.h"
#include "nsIPrincipal.h"
#include "nsIURI.h"
#include "nsContentUtils.h"
#include "nsReadableUtils.h"
#include "nsGkAtoms.h"
#include "nsComponentManagerUtils.h"
#include "nsLayoutStatics.h"
#include "nsBindingManager.h"
#include "nsHashKeys.h"
#include "nsCCUncollectableMarker.h"
#include "nsNameSpaceManager.h"
#include "nsDocument.h"
#include "nsWindowSizes.h"
using namespace mozilla;
using mozilla::dom::NodeInfo;
#include "mozilla/Logging.h"
static LazyLogModule gNodeInfoManagerLeakPRLog("NodeInfoManagerLeak");
static const uint32_t kInitialNodeInfoHashSize = 32;
nsNodeInfoManager::nsNodeInfoManager()
: mNodeInfoHash(kInitialNodeInfoHashSize),
mDocument(nullptr),
mNonDocumentNodeInfos(0),
mTextNodeInfo(nullptr),
mCommentNodeInfo(nullptr),
mDocumentNodeInfo(nullptr),
mRecentlyUsedNodeInfos{},
mSVGEnabled(eTriUnset),
mMathMLEnabled(eTriUnset)
{
nsLayoutStatics::AddRef();
if (gNodeInfoManagerLeakPRLog)
MOZ_LOG(gNodeInfoManagerLeakPRLog, LogLevel::Debug,
("NODEINFOMANAGER %p created", this));
}
nsNodeInfoManager::~nsNodeInfoManager()
{
// Note: mPrincipal may be null here if we never got inited correctly
mPrincipal = nullptr;
mBindingManager = nullptr;
if (gNodeInfoManagerLeakPRLog)
MOZ_LOG(gNodeInfoManagerLeakPRLog, LogLevel::Debug,
("NODEINFOMANAGER %p destroyed", this));
nsLayoutStatics::Release();
}
NS_IMPL_CYCLE_COLLECTION_CLASS(nsNodeInfoManager)
NS_IMPL_CYCLE_COLLECTION_UNLINK_0(nsNodeInfoManager)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsNodeInfoManager)
if (tmp->mNonDocumentNodeInfos) {
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_RAWPTR(mDocument)
}
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mBindingManager)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(nsNodeInfoManager, AddRef)
NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(nsNodeInfoManager, Release)
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_BEGIN(nsNodeInfoManager)
if (tmp->mDocument) {
return NS_CYCLE_COLLECTION_PARTICIPANT(nsDocument)->CanSkip(tmp->mDocument, aRemovingAllowed);
}
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_END
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_BEGIN(nsNodeInfoManager)
if (tmp->mDocument) {
return NS_CYCLE_COLLECTION_PARTICIPANT(nsDocument)->CanSkipInCC(tmp->mDocument);
}
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_END
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_BEGIN(nsNodeInfoManager)
if (tmp->mDocument) {
return NS_CYCLE_COLLECTION_PARTICIPANT(nsDocument)->CanSkipThis(tmp->mDocument);
}
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_END
nsresult
nsNodeInfoManager::Init(nsIDocument *aDocument)
{
MOZ_ASSERT(!mPrincipal,
"Being inited when we already have a principal?");
mPrincipal = NullPrincipal::CreateWithoutOriginAttributes();
if (aDocument) {
mBindingManager = new nsBindingManager(aDocument);
}
mDefaultPrincipal = mPrincipal;
mDocument = aDocument;
if (gNodeInfoManagerLeakPRLog)
MOZ_LOG(gNodeInfoManagerLeakPRLog, LogLevel::Debug,
("NODEINFOMANAGER %p Init document=%p", this, aDocument));
return NS_OK;
}
void
nsNodeInfoManager::DropDocumentReference()
{
if (mBindingManager) {
mBindingManager->DropDocumentReference();
}
// This is probably not needed anymore.
for (auto iter = mNodeInfoHash.Iter(); !iter.Done(); iter.Next()) {
iter.Data()->mDocument = nullptr;
}
NS_ASSERTION(!mNonDocumentNodeInfos, "Shouldn't have non-document nodeinfos!");
mDocument = nullptr;
}
already_AddRefed<mozilla::dom::NodeInfo>
nsNodeInfoManager::GetNodeInfo(nsAtom *aName, nsAtom *aPrefix,
int32_t aNamespaceID, uint16_t aNodeType,
nsAtom* aExtraName /* = nullptr */)
{
CheckValidNodeInfo(aNodeType, aName, aNamespaceID, aExtraName);
NodeInfo::NodeInfoInner tmpKey(aName, aPrefix, aNamespaceID, aNodeType,
aExtraName);
uint32_t index = tmpKey.Hash() % RECENTLY_USED_NODEINFOS_SIZE;
NodeInfo* ni = mRecentlyUsedNodeInfos[index];
if (ni && tmpKey == ni->mInner) {
RefPtr<NodeInfo> nodeInfo = ni;
return nodeInfo.forget();
}
// We don't use LookupForAdd here as that would end up storing the temporary
// key instead of using `mInner`.
RefPtr<NodeInfo> nodeInfo = mNodeInfoHash.Get(&tmpKey);
if (!nodeInfo) {
++mNonDocumentNodeInfos;
if (mNonDocumentNodeInfos == 1) {
NS_IF_ADDREF(mDocument);
}
nodeInfo = new NodeInfo(aName, aPrefix, aNamespaceID, aNodeType, aExtraName, this);
mNodeInfoHash.Put(&nodeInfo->mInner, nodeInfo);
}
// Have to do the swap thing, because already_AddRefed<nsNodeInfo>
// doesn't cast to already_AddRefed<mozilla::dom::NodeInfo>
mRecentlyUsedNodeInfos[index] = nodeInfo;
return nodeInfo.forget();
}
nsresult
nsNodeInfoManager::GetNodeInfo(const nsAString& aName, nsAtom *aPrefix,
int32_t aNamespaceID, uint16_t aNodeType,
NodeInfo** aNodeInfo)
{
// TODO(erahm): Combine this with the atom version.
#ifdef DEBUG
{
RefPtr<nsAtom> nameAtom = NS_Atomize(aName);
CheckValidNodeInfo(aNodeType, nameAtom, aNamespaceID, nullptr);
}
#endif
NodeInfo::NodeInfoInner tmpKey(aName, aPrefix, aNamespaceID, aNodeType);
uint32_t index = tmpKey.Hash() % RECENTLY_USED_NODEINFOS_SIZE;
NodeInfo* ni = mRecentlyUsedNodeInfos[index];
if (ni && ni->mInner == tmpKey) {
RefPtr<NodeInfo> nodeInfo = ni;
nodeInfo.forget(aNodeInfo);
return NS_OK;
}
RefPtr<NodeInfo> nodeInfo = mNodeInfoHash.Get(&tmpKey);
if (!nodeInfo) {
++mNonDocumentNodeInfos;
if (mNonDocumentNodeInfos == 1) {
NS_IF_ADDREF(mDocument);
}
RefPtr<nsAtom> nameAtom = NS_Atomize(aName);
nodeInfo = new NodeInfo(nameAtom, aPrefix, aNamespaceID, aNodeType, nullptr, this);
mNodeInfoHash.Put(&nodeInfo->mInner, nodeInfo);
}
mRecentlyUsedNodeInfos[index] = nodeInfo;
nodeInfo.forget(aNodeInfo);
return NS_OK;
}
nsresult
nsNodeInfoManager::GetNodeInfo(const nsAString& aName, nsAtom *aPrefix,
const nsAString& aNamespaceURI,
uint16_t aNodeType,
NodeInfo** aNodeInfo)
{
int32_t nsid = kNameSpaceID_None;
if (!aNamespaceURI.IsEmpty()) {
nsresult rv = nsContentUtils::NameSpaceManager()->
RegisterNameSpace(aNamespaceURI, nsid);
NS_ENSURE_SUCCESS(rv, rv);
}
return GetNodeInfo(aName, aPrefix, nsid, aNodeType, aNodeInfo);
}
already_AddRefed<NodeInfo>
nsNodeInfoManager::GetTextNodeInfo()
{
RefPtr<mozilla::dom::NodeInfo> nodeInfo;
if (!mTextNodeInfo) {
nodeInfo = GetNodeInfo(nsGkAtoms::textTagName, nullptr, kNameSpaceID_None,
nsINode::TEXT_NODE, nullptr);
// Hold a weak ref; the nodeinfo will let us know when it goes away
mTextNodeInfo = nodeInfo;
} else {
nodeInfo = mTextNodeInfo;
}
return nodeInfo.forget();
}
already_AddRefed<NodeInfo>
nsNodeInfoManager::GetCommentNodeInfo()
{
RefPtr<NodeInfo> nodeInfo;
if (!mCommentNodeInfo) {
nodeInfo = GetNodeInfo(nsGkAtoms::commentTagName, nullptr,
kNameSpaceID_None, nsINode::COMMENT_NODE,
nullptr);
// Hold a weak ref; the nodeinfo will let us know when it goes away
mCommentNodeInfo = nodeInfo;
}
else {
nodeInfo = mCommentNodeInfo;
}
return nodeInfo.forget();
}
already_AddRefed<NodeInfo>
nsNodeInfoManager::GetDocumentNodeInfo()
{
RefPtr<NodeInfo> nodeInfo;
if (!mDocumentNodeInfo) {
NS_ASSERTION(mDocument, "Should have mDocument!");
nodeInfo = GetNodeInfo(nsGkAtoms::documentNodeName, nullptr,
kNameSpaceID_None, nsINode::DOCUMENT_NODE,
nullptr);
// Hold a weak ref; the nodeinfo will let us know when it goes away
mDocumentNodeInfo = nodeInfo;
--mNonDocumentNodeInfos;
if (!mNonDocumentNodeInfos) {
mDocument->Release(); // Don't set mDocument to null!
}
}
else {
nodeInfo = mDocumentNodeInfo;
}
return nodeInfo.forget();
}
void
nsNodeInfoManager::SetDocumentPrincipal(nsIPrincipal *aPrincipal)
{
mPrincipal = nullptr;
if (!aPrincipal) {
aPrincipal = mDefaultPrincipal;
}
NS_ASSERTION(aPrincipal, "Must have principal by this point!");
MOZ_DIAGNOSTIC_ASSERT(!nsContentUtils::IsExpandedPrincipal(aPrincipal),
"Documents shouldn't have an expanded principal");
mPrincipal = aPrincipal;
}
void
nsNodeInfoManager::RemoveNodeInfo(NodeInfo *aNodeInfo)
{
MOZ_ASSERT(aNodeInfo, "Trying to remove null nodeinfo from manager!");
if (aNodeInfo == mDocumentNodeInfo) {
mDocumentNodeInfo = nullptr;
mDocument = nullptr;
} else {
if (--mNonDocumentNodeInfos == 0) {
if (mDocument) {
// Note, whoever calls this method should keep NodeInfoManager alive,
// even if mDocument gets deleted.
mDocument->Release();
}
}
// Drop weak reference if needed
if (aNodeInfo == mTextNodeInfo) {
mTextNodeInfo = nullptr;
}
else if (aNodeInfo == mCommentNodeInfo) {
mCommentNodeInfo = nullptr;
}
}
uint32_t index = aNodeInfo->mInner.Hash() % RECENTLY_USED_NODEINFOS_SIZE;
if (mRecentlyUsedNodeInfos[index] == aNodeInfo) {
mRecentlyUsedNodeInfos[index] = nullptr;
}
DebugOnly<bool> ret = mNodeInfoHash.Remove(&aNodeInfo->mInner);
MOZ_ASSERT(ret, "Can't find mozilla::dom::NodeInfo to remove!!!");
}
bool
nsNodeInfoManager::InternalSVGEnabled()
{
// If the svg.disabled pref. is true, convert all SVG nodes into
// disabled SVG nodes by swapping the namespace.
nsNameSpaceManager* nsmgr = nsNameSpaceManager::GetInstance();
nsCOMPtr<nsILoadInfo> loadInfo;
bool SVGEnabled = false;
if (nsmgr && !nsmgr->mSVGDisabled) {
SVGEnabled = true;
} else {
nsCOMPtr<nsIChannel> channel = mDocument->GetChannel();
// We don't have a channel for SVGs constructed inside a SVG script
if (channel) {
loadInfo = channel->GetLoadInfo();
}
}
bool conclusion =
(SVGEnabled || nsContentUtils::IsSystemPrincipal(mPrincipal) ||
(loadInfo &&
(loadInfo->GetExternalContentPolicyType() ==
nsIContentPolicy::TYPE_IMAGE ||
loadInfo->GetExternalContentPolicyType() ==
nsIContentPolicy::TYPE_OTHER) &&
(nsContentUtils::IsSystemPrincipal(loadInfo->LoadingPrincipal()) ||
nsContentUtils::IsSystemPrincipal(loadInfo->TriggeringPrincipal()))));
mSVGEnabled = conclusion ? eTriTrue : eTriFalse;
return conclusion;
}
bool
nsNodeInfoManager::InternalMathMLEnabled()
{
// If the mathml.disabled pref. is true, convert all MathML nodes into
// disabled MathML nodes by swapping the namespace.
nsNameSpaceManager* nsmgr = nsNameSpaceManager::GetInstance();
bool conclusion = ((nsmgr && !nsmgr->mMathMLDisabled) ||
nsContentUtils::IsSystemPrincipal(mPrincipal));
mMathMLEnabled = conclusion ? eTriTrue : eTriFalse;
return conclusion;
}
void
nsNodeInfoManager::AddSizeOfIncludingThis(nsWindowSizes& aSizes) const
{
aSizes.mDOMOtherSize += aSizes.mState.mMallocSizeOf(this);
if (mBindingManager) {
aSizes.mBindingsSize +=
mBindingManager->SizeOfIncludingThis(aSizes.mState.mMallocSizeOf);
}
// Measurement of the following members may be added later if DMD finds it
// is worthwhile:
// - mNodeInfoHash
}