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