1 /* 2 * Copyright (C) 2007, 2009, 2010 Apple 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 "JSNode.h" 28 29 #include "Attr.h" 30 #include "CDATASection.h" 31 #include "Comment.h" 32 #include "Document.h" 33 #include "DocumentFragment.h" 34 #include "DocumentType.h" 35 #include "Entity.h" 36 #include "EntityReference.h" 37 #include "ExceptionCode.h" 38 #include "HTMLAudioElement.h" 39 #include "HTMLCanvasElement.h" 40 #include "HTMLElement.h" 41 #include "HTMLFrameElementBase.h" 42 #include "HTMLImageElement.h" 43 #include "HTMLLinkElement.h" 44 #include "HTMLNames.h" 45 #include "HTMLScriptElement.h" 46 #include "HTMLStyleElement.h" 47 #include "JSAttr.h" 48 #include "JSCDATASection.h" 49 #include "JSComment.h" 50 #include "JSDOMBinding.h" 51 #include "JSDocument.h" 52 #include "JSDocumentFragment.h" 53 #include "JSDocumentType.h" 54 #include "JSEntity.h" 55 #include "JSEntityReference.h" 56 #include "JSEventListener.h" 57 #include "JSHTMLElement.h" 58 #include "JSHTMLElementWrapperFactory.h" 59 #include "JSNotation.h" 60 #include "JSProcessingInstruction.h" 61 #include "JSText.h" 62 #include "Node.h" 63 #include "Notation.h" 64 #include "ProcessingInstruction.h" 65 #include "RegisteredEventListener.h" 66 #include "StyleSheet.h" 67 #include "StyledElement.h" 68 #include "Text.h" 69 #include <wtf/PassRefPtr.h> 70 #include <wtf/RefPtr.h> 71 72 #if ENABLE(SVG) 73 #include "JSSVGElementWrapperFactory.h" 74 #include "SVGElement.h" 75 #endif 76 77 using namespace JSC; 78 79 namespace WebCore { 80 81 using namespace HTMLNames; 82 83 static bool isObservable(JSNode* jsNode, Node* node, DOMWrapperWorld* world) 84 { 85 // Certain conditions implicitly make existence of a JS DOM node wrapper observable 86 // through the DOM, even if no explicit reference to it remains. 87 88 // The DOM doesn't know how to keep a tree of nodes alive without the root 89 // being explicitly referenced. So, we artificially treat the root of 90 // every tree as observable. 91 // FIXME: Resolve this lifetime issue in the DOM, and remove this inefficiency. 92 if (!node->parentNode()) 93 return true; 94 95 // If a node is in the document, and its wrapper has custom properties, 96 // the wrapper is observable because future access to the node through the 97 // DOM must reflect those properties. 98 if (jsNode->hasCustomProperties()) 99 return true; 100 101 // If a node is in the document, and has event listeners, its wrapper is 102 // observable because its wrapper is responsible for marking those event listeners. 103 if (node->hasEventListeners()) 104 return true; 105 106 // If a node owns another object with a wrapper with custom properties, 107 // the wrapper must be treated as observable, because future access to 108 // those objects through the DOM must reflect those properties. 109 // FIXME: It would be better if this logic could be in the node next to 110 // the custom markChildren functions rather than here. 111 // Note that for some compound objects like stylesheets and CSSStyleDeclarations, 112 // we don't descend to check children for custom properties, and just conservatively 113 // keep the node wrappers protecting them alive. 114 if (node->isElementNode()) { 115 if (node->isStyledElement()) { 116 if (CSSMutableStyleDeclaration* style = static_cast<StyledElement*>(node)->inlineStyleDecl()) { 117 if (world->m_wrappers.get(style)) 118 return true; 119 } 120 } 121 if (static_cast<Element*>(node)->hasTagName(canvasTag)) { 122 if (CanvasRenderingContext* context = static_cast<HTMLCanvasElement*>(node)->renderingContext()) { 123 if (JSDOMWrapper* wrapper = world->m_wrappers.get(context).get()) { 124 if (wrapper->hasCustomProperties()) 125 return true; 126 } 127 } 128 } else if (static_cast<Element*>(node)->hasTagName(linkTag)) { 129 if (StyleSheet* sheet = static_cast<HTMLLinkElement*>(node)->sheet()) { 130 if (world->m_wrappers.get(sheet)) 131 return true; 132 } 133 } else if (static_cast<Element*>(node)->hasTagName(styleTag)) { 134 if (StyleSheet* sheet = static_cast<HTMLStyleElement*>(node)->sheet()) { 135 if (world->m_wrappers.get(sheet)) 136 return true; 137 } 138 } 139 } else if (node->nodeType() == Node::PROCESSING_INSTRUCTION_NODE) { 140 if (StyleSheet* sheet = static_cast<ProcessingInstruction*>(node)->sheet()) { 141 if (world->m_wrappers.get(sheet)) 142 return true; 143 } 144 } 145 146 return false; 147 } 148 149 static inline bool isReachableFromDOM(JSNode* jsNode, Node* node, DOMWrapperWorld* world, MarkStack& markStack) 150 { 151 if (!node->inDocument()) { 152 // If a wrapper is the last reference to an image or script element 153 // that is loading but not in the document, the wrapper is observable 154 // because it is the only thing keeping the image element alive, and if 155 // the image element is destroyed, its load event will not fire. 156 // FIXME: The DOM should manage this issue without the help of JavaScript wrappers. 157 if (node->hasTagName(imgTag) && !static_cast<HTMLImageElement*>(node)->haveFiredLoadEvent()) 158 return true; 159 if (node->hasTagName(scriptTag) && !static_cast<HTMLScriptElement*>(node)->haveFiredLoadEvent()) 160 return true; 161 #if ENABLE(VIDEO) 162 if (node->hasTagName(audioTag) && !static_cast<HTMLAudioElement*>(node)->paused()) 163 return true; 164 #endif 165 166 // If a node is firing event listeners, its wrapper is observable because 167 // its wrapper is responsible for marking those event listeners. 168 if (node->isFiringEventListeners()) 169 return true; 170 } 171 172 return isObservable(jsNode, node, world) && markStack.containsOpaqueRoot(root(node)); 173 } 174 175 bool JSNodeOwner::isReachableFromOpaqueRoots(JSC::Handle<JSC::Unknown> handle, void* context, MarkStack& markStack) 176 { 177 JSNode* jsNode = static_cast<JSNode*>(handle.get().asCell()); 178 DOMWrapperWorld* world = static_cast<DOMWrapperWorld*>(context); 179 return isReachableFromDOM(jsNode, jsNode->impl(), world, markStack); 180 } 181 182 void JSNodeOwner::finalize(JSC::Handle<JSC::Unknown> handle, void* context) 183 { 184 JSNode* jsNode = static_cast<JSNode*>(handle.get().asCell()); 185 DOMWrapperWorld* world = static_cast<DOMWrapperWorld*>(context); 186 uncacheWrapper(world, jsNode->impl(), jsNode); 187 } 188 189 JSValue JSNode::insertBefore(ExecState* exec) 190 { 191 Node* imp = static_cast<Node*>(impl()); 192 ExceptionCode ec = 0; 193 bool ok = imp->insertBefore(toNode(exec->argument(0)), toNode(exec->argument(1)), ec, true); 194 setDOMException(exec, ec); 195 if (ok) 196 return exec->argument(0); 197 return jsNull(); 198 } 199 200 JSValue JSNode::replaceChild(ExecState* exec) 201 { 202 Node* imp = static_cast<Node*>(impl()); 203 ExceptionCode ec = 0; 204 bool ok = imp->replaceChild(toNode(exec->argument(0)), toNode(exec->argument(1)), ec, true); 205 setDOMException(exec, ec); 206 if (ok) 207 return exec->argument(1); 208 return jsNull(); 209 } 210 211 JSValue JSNode::removeChild(ExecState* exec) 212 { 213 Node* imp = static_cast<Node*>(impl()); 214 ExceptionCode ec = 0; 215 bool ok = imp->removeChild(toNode(exec->argument(0)), ec); 216 setDOMException(exec, ec); 217 if (ok) 218 return exec->argument(0); 219 return jsNull(); 220 } 221 222 JSValue JSNode::appendChild(ExecState* exec) 223 { 224 Node* imp = static_cast<Node*>(impl()); 225 ExceptionCode ec = 0; 226 bool ok = imp->appendChild(toNode(exec->argument(0)), ec, true); 227 setDOMException(exec, ec); 228 if (ok) 229 return exec->argument(0); 230 return jsNull(); 231 } 232 233 ScopeChainNode* JSNode::pushEventHandlerScope(ExecState*, ScopeChainNode* node) const 234 { 235 return node; 236 } 237 238 void JSNode::markChildren(MarkStack& markStack) 239 { 240 Base::markChildren(markStack); 241 242 Node* node = m_impl.get(); 243 node->markJSEventListeners(markStack); 244 245 markStack.addOpaqueRoot(root(node)); 246 } 247 248 static ALWAYS_INLINE JSValue createWrapperInline(ExecState* exec, JSDOMGlobalObject* globalObject, Node* node) 249 { 250 ASSERT(node); 251 ASSERT(!getCachedWrapper(currentWorld(exec), node)); 252 253 JSNode* wrapper; 254 switch (node->nodeType()) { 255 case Node::ELEMENT_NODE: 256 if (node->isHTMLElement()) 257 wrapper = createJSHTMLWrapper(exec, globalObject, toHTMLElement(node)); 258 #if ENABLE(SVG) 259 else if (node->isSVGElement()) 260 wrapper = createJSSVGWrapper(exec, globalObject, static_cast<SVGElement*>(node)); 261 #endif 262 else 263 wrapper = CREATE_DOM_NODE_WRAPPER(exec, globalObject, Element, node); 264 break; 265 case Node::ATTRIBUTE_NODE: 266 wrapper = CREATE_DOM_NODE_WRAPPER(exec, globalObject, Attr, node); 267 break; 268 case Node::TEXT_NODE: 269 wrapper = CREATE_DOM_NODE_WRAPPER(exec, globalObject, Text, node); 270 break; 271 case Node::CDATA_SECTION_NODE: 272 wrapper = CREATE_DOM_NODE_WRAPPER(exec, globalObject, CDATASection, node); 273 break; 274 case Node::ENTITY_NODE: 275 wrapper = CREATE_DOM_NODE_WRAPPER(exec, globalObject, Entity, node); 276 break; 277 case Node::PROCESSING_INSTRUCTION_NODE: 278 wrapper = CREATE_DOM_NODE_WRAPPER(exec, globalObject, ProcessingInstruction, node); 279 break; 280 case Node::COMMENT_NODE: 281 wrapper = CREATE_DOM_NODE_WRAPPER(exec, globalObject, Comment, node); 282 break; 283 case Node::DOCUMENT_NODE: 284 // we don't want to cache the document itself in the per-document dictionary 285 return toJS(exec, globalObject, static_cast<Document*>(node)); 286 case Node::DOCUMENT_TYPE_NODE: 287 wrapper = CREATE_DOM_NODE_WRAPPER(exec, globalObject, DocumentType, node); 288 break; 289 case Node::NOTATION_NODE: 290 wrapper = CREATE_DOM_NODE_WRAPPER(exec, globalObject, Notation, node); 291 break; 292 case Node::DOCUMENT_FRAGMENT_NODE: 293 wrapper = CREATE_DOM_NODE_WRAPPER(exec, globalObject, DocumentFragment, node); 294 break; 295 case Node::ENTITY_REFERENCE_NODE: 296 wrapper = CREATE_DOM_NODE_WRAPPER(exec, globalObject, EntityReference, node); 297 break; 298 default: 299 wrapper = CREATE_DOM_NODE_WRAPPER(exec, globalObject, Node, node); 300 } 301 302 return wrapper; 303 } 304 305 JSValue createWrapper(ExecState* exec, JSDOMGlobalObject* globalObject, Node* node) 306 { 307 return createWrapperInline(exec, globalObject, node); 308 } 309 310 JSValue toJSNewlyCreated(ExecState* exec, JSDOMGlobalObject* globalObject, Node* node) 311 { 312 if (!node) 313 return jsNull(); 314 315 return createWrapperInline(exec, globalObject, node); 316 } 317 318 } // namespace WebCore 319
