206 lines
6.1 KiB
C++
206 lines
6.1 KiB
C++
/*
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* Copyright (C) 2004 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "runtime_root.h"
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#include "BridgeJSC.h"
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#include "runtime_object.h"
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#include <JavaScriptCore/JSGlobalObject.h>
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#include <JavaScriptCore/StrongInlines.h>
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#include <JavaScriptCore/Weak.h>
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#include <JavaScriptCore/WeakInlines.h>
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#include <wtf/HashSet.h>
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#include <wtf/NeverDestroyed.h>
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#include <wtf/Ref.h>
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#include <wtf/StdLibExtras.h>
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namespace JSC { namespace Bindings {
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// This code attempts to solve two problems: (1) plug-ins leaking references to
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// JS and the DOM; (2) plug-ins holding stale references to JS and the DOM. Previous
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// comments in this file claimed that problem #1 was an issue in Java, in particular,
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// because Java, allegedly, didn't always call finalize when collecting an object.
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typedef HashSet<RootObject*> RootObjectSet;
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static RootObjectSet& rootObjectSet()
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{
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static NeverDestroyed<RootObjectSet> staticRootObjectSet;
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return staticRootObjectSet;
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}
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// FIXME: These two functions are a potential performance problem. We could
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// fix them by adding a JSObject to RootObject dictionary.
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RootObject* findProtectingRootObject(JSObject* jsObject)
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{
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RootObjectSet::const_iterator end = rootObjectSet().end();
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for (RootObjectSet::const_iterator it = rootObjectSet().begin(); it != end; ++it) {
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if ((*it)->gcIsProtected(jsObject))
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return *it;
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}
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return 0;
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}
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RootObject* findRootObject(JSGlobalObject* globalObject)
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{
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RootObjectSet::const_iterator end = rootObjectSet().end();
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for (RootObjectSet::const_iterator it = rootObjectSet().begin(); it != end; ++it) {
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if ((*it)->globalObject() == globalObject)
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return *it;
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}
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return 0;
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}
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RootObject::InvalidationCallback::~InvalidationCallback() = default;
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Ref<RootObject> RootObject::create(const void* nativeHandle, JSGlobalObject* globalObject)
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{
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return adoptRef(*new RootObject(nativeHandle, globalObject));
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}
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RootObject::RootObject(const void* nativeHandle, JSGlobalObject* globalObject)
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: m_isValid(true)
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, m_nativeHandle(nativeHandle)
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, m_globalObject(globalObject->vm(), globalObject)
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{
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ASSERT(globalObject);
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rootObjectSet().add(this);
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}
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RootObject::~RootObject()
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{
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if (m_isValid)
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invalidate();
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}
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void RootObject::invalidate()
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{
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if (!m_isValid)
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return;
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{
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// Get the objects from the keys; the values might be nulled.
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// Safe because finalized runtime objects are removed from m_runtimeObjects by RootObject::finalize.
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for (RuntimeObject* runtimeObject : m_runtimeObjects.keys())
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runtimeObject->invalidate();
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m_runtimeObjects.clear();
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}
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m_isValid = false;
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m_nativeHandle = 0;
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m_globalObject.clear();
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{
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HashSet<InvalidationCallback*>::iterator end = m_invalidationCallbacks.end();
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for (HashSet<InvalidationCallback*>::iterator iter = m_invalidationCallbacks.begin(); iter != end; ++iter)
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(**iter)(this);
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m_invalidationCallbacks.clear();
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}
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ProtectCountSet::iterator end = m_protectCountSet.end();
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for (ProtectCountSet::iterator it = m_protectCountSet.begin(); it != end; ++it)
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JSC::gcUnprotect(it->key);
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m_protectCountSet.clear();
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rootObjectSet().remove(this);
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}
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void RootObject::gcProtect(JSObject* jsObject)
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{
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ASSERT(m_isValid);
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if (!m_protectCountSet.contains(jsObject)) {
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JSC::JSLockHolder holder(&globalObject()->vm());
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JSC::gcProtect(jsObject);
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}
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m_protectCountSet.add(jsObject);
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}
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void RootObject::gcUnprotect(JSObject* jsObject)
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{
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ASSERT(m_isValid);
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if (!jsObject)
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return;
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if (m_protectCountSet.count(jsObject) == 1) {
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JSC::JSLockHolder holder(&globalObject()->vm());
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JSC::gcUnprotect(jsObject);
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}
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m_protectCountSet.remove(jsObject);
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}
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bool RootObject::gcIsProtected(JSObject* jsObject)
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{
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ASSERT(m_isValid);
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return m_protectCountSet.contains(jsObject);
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}
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const void* RootObject::nativeHandle() const
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{
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ASSERT(m_isValid);
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return m_nativeHandle;
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}
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JSGlobalObject* RootObject::globalObject() const
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{
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ASSERT(m_isValid);
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return m_globalObject.get();
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}
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void RootObject::updateGlobalObject(JSGlobalObject* globalObject)
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{
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m_globalObject.set(globalObject->vm(), globalObject);
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}
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void RootObject::addRuntimeObject(VM&, RuntimeObject* object)
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{
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ASSERT(m_isValid);
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weakAdd(m_runtimeObjects, object, JSC::Weak<RuntimeObject>(object, this));
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}
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void RootObject::removeRuntimeObject(RuntimeObject* object)
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{
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if (!m_isValid)
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return;
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weakRemove(m_runtimeObjects, object, object);
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}
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void RootObject::finalize(JSC::Handle<JSC::Unknown> handle, void*)
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{
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RuntimeObject* object = static_cast<RuntimeObject*>(handle.slot()->asCell());
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Ref<RootObject> protectedThis(*this);
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object->invalidate();
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weakRemove(m_runtimeObjects, object, object);
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}
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} } // namespace JSC::Bindings
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