2 * Copyright (C) 2004 Apple Computer, Inc. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 #include "runtime_root.h"
29 #include "BridgeJSC.h"
30 #include "runtime_object.h"
31 #include <heap/Weak.h>
32 #include <runtime/JSGlobalObject.h>
33 #include <wtf/HashCountedSet.h>
34 #include <wtf/HashSet.h>
35 #include <wtf/StdLibExtras.h>
37 namespace JSC { namespace Bindings {
39 // This code attempts to solve two problems: (1) plug-ins leaking references to
40 // JS and the DOM; (2) plug-ins holding stale references to JS and the DOM. Previous
41 // comments in this file claimed that problem #1 was an issue in Java, in particular,
42 // because Java, allegedly, didn't always call finalize when collecting an object.
44 typedef HashSet<RootObject*> RootObjectSet;
46 static RootObjectSet* rootObjectSet()
48 DEFINE_STATIC_LOCAL(RootObjectSet, staticRootObjectSet, ());
49 return &staticRootObjectSet;
52 // FIXME: These two functions are a potential performance problem. We could
53 // fix them by adding a JSObject to RootObject dictionary.
55 RootObject* findProtectingRootObject(JSObject* jsObject)
57 RootObjectSet::const_iterator end = rootObjectSet()->end();
58 for (RootObjectSet::const_iterator it = rootObjectSet()->begin(); it != end; ++it) {
59 if ((*it)->gcIsProtected(jsObject))
65 RootObject* findRootObject(JSGlobalObject* globalObject)
67 RootObjectSet::const_iterator end = rootObjectSet()->end();
68 for (RootObjectSet::const_iterator it = rootObjectSet()->begin(); it != end; ++it) {
69 if ((*it)->globalObject() == globalObject)
75 RootObject::InvalidationCallback::~InvalidationCallback()
79 PassRefPtr<RootObject> RootObject::create(const void* nativeHandle, JSGlobalObject* globalObject)
81 return adoptRef(new RootObject(nativeHandle, globalObject));
84 RootObject::RootObject(const void* nativeHandle, JSGlobalObject* globalObject)
86 , m_nativeHandle(nativeHandle)
87 , m_globalObject(globalObject->globalData(), globalObject)
90 rootObjectSet()->add(this);
93 RootObject::~RootObject()
99 void RootObject::invalidate()
105 HashMap<RuntimeObject*, JSC::Weak<RuntimeObject> >::iterator end = m_runtimeObjects.end();
106 for (HashMap<RuntimeObject*, JSC::Weak<RuntimeObject> >::iterator it = m_runtimeObjects.begin(); it != end; ++it) {
107 it->second.get()->invalidate();
110 m_runtimeObjects.clear();
116 m_globalObject.clear();
119 HashSet<InvalidationCallback*>::iterator end = m_invalidationCallbacks.end();
120 for (HashSet<InvalidationCallback*>::iterator iter = m_invalidationCallbacks.begin(); iter != end; ++iter)
123 m_invalidationCallbacks.clear();
126 ProtectCountSet::iterator end = m_protectCountSet.end();
127 for (ProtectCountSet::iterator it = m_protectCountSet.begin(); it != end; ++it)
128 JSC::gcUnprotect(it->first);
129 m_protectCountSet.clear();
131 rootObjectSet()->remove(this);
134 void RootObject::gcProtect(JSObject* jsObject)
138 if (!m_protectCountSet.contains(jsObject))
139 JSC::gcProtect(jsObject);
140 m_protectCountSet.add(jsObject);
143 void RootObject::gcUnprotect(JSObject* jsObject)
150 if (m_protectCountSet.count(jsObject) == 1)
151 JSC::gcUnprotect(jsObject);
152 m_protectCountSet.remove(jsObject);
155 bool RootObject::gcIsProtected(JSObject* jsObject)
158 return m_protectCountSet.contains(jsObject);
161 const void* RootObject::nativeHandle() const
164 return m_nativeHandle;
167 JSGlobalObject* RootObject::globalObject() const
170 return m_globalObject.get();
173 void RootObject::updateGlobalObject(JSGlobalObject* globalObject)
175 m_globalObject.set(globalObject->globalData(), globalObject);
178 void RootObject::addRuntimeObject(JSGlobalData& globalData, RuntimeObject* object)
181 ASSERT(!m_runtimeObjects.get(object));
183 m_runtimeObjects.set(object, JSC::Weak<RuntimeObject>(globalData, object, this));
186 void RootObject::removeRuntimeObject(RuntimeObject* object)
191 ASSERT(m_runtimeObjects.get(object));
193 m_runtimeObjects.take(object);
196 void RootObject::finalize(JSC::Handle<JSC::Unknown> handle, void*)
198 RuntimeObject* object = static_cast<RuntimeObject*>(asObject(handle.get()));
199 ASSERT(m_runtimeObjects.contains(object));
201 object->invalidate();
202 m_runtimeObjects.remove(object);
205 } } // namespace JSC::Bindings