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Diffstat (limited to 'src/bun.js/bindings/webcore/Node.h')
| -rw-r--r-- | src/bun.js/bindings/webcore/Node.h | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/src/bun.js/bindings/webcore/Node.h b/src/bun.js/bindings/webcore/Node.h new file mode 100644 index 000000000..df9917a25 --- /dev/null +++ b/src/bun.js/bindings/webcore/Node.h @@ -0,0 +1,132 @@ +/* + * Copyright (C) 1999 Lars Knoll (knoll@kde.org) + * (C) 1999 Antti Koivisto (koivisto@kde.org) + * (C) 2001 Dirk Mueller (mueller@kde.org) + * Copyright (C) 2004-2020 Apple Inc. All rights reserved. + * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/) + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Library General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Library General Public License for more details. + * + * You should have received a copy of the GNU Library General Public License + * along with this library; see the file COPYING.LIB. If not, write to + * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, + * Boston, MA 02110-1301, USA. + * + */ + +#pragma once + +#include "root.h" + +#include "EventTarget.h" +#include "ExceptionOr.h" +#include <wtf/CompactUniquePtrTuple.h> +#include <wtf/FixedVector.h> +#include <wtf/Forward.h> +// #include <wtf/IsoMalloc.h> +#include <wtf/ListHashSet.h> +#include <wtf/MainThread.h> +#include <wtf/OptionSet.h> +#include <wtf/URLHash.h> +#include <wtf/WeakPtr.h> +#include "EventTargetConcrete.h" + +namespace WebCore { + +// The full Node type is way too much stuff +// this ones just a baby +class Node : public RefPtr<Node>, CanMakeWeakPtr<Node>, public EventTarget { + WTF_MAKE_ISO_ALLOCATED(Node); + + static constexpr uint32_t s_refCountIncrement = 2; + static constexpr uint32_t s_refCountMask = ~static_cast<uint32_t>(1); + +public: + void defaultEventHandler(Event&) + { + // do nothing + } + + void handleEvent(ScriptExecutionContext&, Event&) + { + } + + bool hasEventTargetData() + { + return true; + } + + void ref() const; + void deref() const; + bool hasOneRef() const; + unsigned refCount() const; + + void removedLastRef() {} + + mutable uint32_t m_refCountAndParentBit { s_refCountIncrement }; + // mutable OptionSet<NodeFlag> m_nodeFlags; +}; + +#if ASSERT_ENABLED + +inline void adopted(Node* node) +{ + if (!node) + return; + ASSERT(!node->m_deletionHasBegun); + ASSERT(!node->m_inRemovedLastRefFunction); + node->m_adoptionIsRequired = false; +} + +#endif // ASSERT_ENABLED + +ALWAYS_INLINE void Node::ref() const +{ + ASSERT(isMainThread()); + ASSERT(!m_deletionHasBegun); + ASSERT(!m_inRemovedLastRefFunction); + ASSERT(!m_adoptionIsRequired); + m_refCountAndParentBit += s_refCountIncrement; +} + +ALWAYS_INLINE void Node::deref() const +{ + ASSERT(isMainThread()); + ASSERT(refCount()); + ASSERT(!m_deletionHasBegun); + ASSERT(!m_inRemovedLastRefFunction); + ASSERT(!m_adoptionIsRequired); + auto updatedRefCount = m_refCountAndParentBit - s_refCountIncrement; + if (!updatedRefCount) { + // Don't update m_refCountAndParentBit to avoid double destruction through use of Ref<T>/RefPtr<T>. + // (This is a security mitigation in case of programmer error. It will ASSERT in debug builds.) +#if ASSERT_ENABLED + m_inRemovedLastRefFunction = true; +#endif + const_cast<Node&>(*this).removedLastRef(); + return; + } + m_refCountAndParentBit = updatedRefCount; +} + +ALWAYS_INLINE bool Node::hasOneRef() const +{ + ASSERT(!m_deletionHasBegun); + ASSERT(!m_inRemovedLastRefFunction); + return refCount() == 1; +} + +ALWAYS_INLINE unsigned Node::refCount() const +{ + return m_refCountAndParentBit / s_refCountIncrement; +} + +}
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