1 /* 2 * Copyright (C) 2004 Apple Computer, Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 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. 12 * 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 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #include "config.h" 27 #include "runtime_root.h" 28 29 #include "BridgeJSC.h" 30 #include "runtime_object.h" 31 #include <runtime/JSGlobalObject.h> 32 #include <wtf/HashCountedSet.h> 33 #include <wtf/HashSet.h> 34 #include <wtf/StdLibExtras.h> 35 36 namespace JSC { namespace Bindings { 37 38 // This code attempts to solve two problems: (1) plug-ins leaking references to 39 // JS and the DOM; (2) plug-ins holding stale references to JS and the DOM. Previous 40 // comments in this file claimed that problem #1 was an issue in Java, in particular, 41 // because Java, allegedly, didn't always call finalize when collecting an object. 42 43 typedef HashSet<RootObject*> RootObjectSet; 44 45 static RootObjectSet* rootObjectSet() 46 { 47 DEFINE_STATIC_LOCAL(RootObjectSet, staticRootObjectSet, ()); 48 return &staticRootObjectSet; 49 } 50 51 // FIXME: These two functions are a potential performance problem. We could 52 // fix them by adding a JSObject to RootObject dictionary. 53 54 RootObject* findProtectingRootObject(JSObject* jsObject) 55 { 56 RootObjectSet::const_iterator end = rootObjectSet()->end(); 57 for (RootObjectSet::const_iterator it = rootObjectSet()->begin(); it != end; ++it) { 58 if ((*it)->gcIsProtected(jsObject)) 59 return *it; 60 } 61 return 0; 62 } 63 64 RootObject* findRootObject(JSGlobalObject* globalObject) 65 { 66 RootObjectSet::const_iterator end = rootObjectSet()->end(); 67 for (RootObjectSet::const_iterator it = rootObjectSet()->begin(); it != end; ++it) { 68 if ((*it)->globalObject() == globalObject) 69 return *it; 70 } 71 return 0; 72 } 73 74 RootObject::InvalidationCallback::~InvalidationCallback() 75 { 76 } 77 78 PassRefPtr<RootObject> RootObject::create(const void* nativeHandle, JSGlobalObject* globalObject) 79 { 80 return adoptRef(new RootObject(nativeHandle, globalObject)); 81 } 82 83 RootObject::RootObject(const void* nativeHandle, JSGlobalObject* globalObject) 84 : m_isValid(true) 85 , m_nativeHandle(nativeHandle) 86 , m_globalObject(globalObject->globalData(), globalObject) 87 { 88 ASSERT(globalObject); 89 rootObjectSet()->add(this); 90 } 91 92 RootObject::~RootObject() 93 { 94 if (m_isValid) 95 invalidate(); 96 } 97 98 void RootObject::invalidate() 99 { 100 if (!m_isValid) 101 return; 102 103 { 104 WeakGCMap<RuntimeObject*, RuntimeObject>::iterator end = m_runtimeObjects.end(); 105 for (WeakGCMap<RuntimeObject*, RuntimeObject>::iterator it = m_runtimeObjects.begin(); it != end; ++it) { 106 it.get().second->invalidate(); 107 } 108 109 m_runtimeObjects.clear(); 110 } 111 112 m_isValid = false; 113 114 m_nativeHandle = 0; 115 m_globalObject.clear(); 116 117 { 118 HashSet<InvalidationCallback*>::iterator end = m_invalidationCallbacks.end(); 119 for (HashSet<InvalidationCallback*>::iterator iter = m_invalidationCallbacks.begin(); iter != end; ++iter) 120 (**iter)(this); 121 122 m_invalidationCallbacks.clear(); 123 } 124 125 ProtectCountSet::iterator end = m_protectCountSet.end(); 126 for (ProtectCountSet::iterator it = m_protectCountSet.begin(); it != end; ++it) 127 JSC::gcUnprotect(it->first); 128 m_protectCountSet.clear(); 129 130 rootObjectSet()->remove(this); 131 } 132 133 void RootObject::gcProtect(JSObject* jsObject) 134 { 135 ASSERT(m_isValid); 136 137 if (!m_protectCountSet.contains(jsObject)) 138 JSC::gcProtect(jsObject); 139 m_protectCountSet.add(jsObject); 140 } 141 142 void RootObject::gcUnprotect(JSObject* jsObject) 143 { 144 ASSERT(m_isValid); 145 146 if (!jsObject) 147 return; 148 149 if (m_protectCountSet.count(jsObject) == 1) 150 JSC::gcUnprotect(jsObject); 151 m_protectCountSet.remove(jsObject); 152 } 153 154 bool RootObject::gcIsProtected(JSObject* jsObject) 155 { 156 ASSERT(m_isValid); 157 return m_protectCountSet.contains(jsObject); 158 } 159 160 const void* RootObject::nativeHandle() const 161 { 162 ASSERT(m_isValid); 163 return m_nativeHandle; 164 } 165 166 JSGlobalObject* RootObject::globalObject() const 167 { 168 ASSERT(m_isValid); 169 return m_globalObject.get(); 170 } 171 172 void RootObject::updateGlobalObject(JSGlobalObject* globalObject) 173 { 174 m_globalObject.set(globalObject->globalData(), globalObject); 175 } 176 177 void RootObject::addRuntimeObject(JSGlobalData& globalData, RuntimeObject* object) 178 { 179 ASSERT(m_isValid); 180 ASSERT(!m_runtimeObjects.get(object)); 181 182 m_runtimeObjects.set(globalData, object, object); 183 } 184 185 void RootObject::removeRuntimeObject(RuntimeObject* object) 186 { 187 if (!m_isValid) 188 return; 189 190 ASSERT(m_runtimeObjects.get(object)); 191 192 m_runtimeObjects.take(object); 193 } 194 195 } } // namespace JSC::Bindings 196
