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
isObservable(JSNode * jsNode,Node * node,DOMWrapperWorld * world)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
isReachableFromDOM(JSNode * jsNode,Node * node,DOMWrapperWorld * world,MarkStack & markStack)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
isReachableFromOpaqueRoots(JSC::Handle<JSC::Unknown> handle,void * context,MarkStack & markStack)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
finalize(JSC::Handle<JSC::Unknown> handle,void * context)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
insertBefore(ExecState * exec)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
replaceChild(ExecState * exec)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
removeChild(ExecState * exec)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
appendChild(ExecState * exec)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
pushEventHandlerScope(ExecState *,ScopeChainNode * node) const233 ScopeChainNode* JSNode::pushEventHandlerScope(ExecState*, ScopeChainNode* node) const
234 {
235 return node;
236 }
237
markChildren(MarkStack & markStack)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
createWrapperInline(ExecState * exec,JSDOMGlobalObject * globalObject,Node * node)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
createWrapper(ExecState * exec,JSDOMGlobalObject * globalObject,Node * node)305 JSValue createWrapper(ExecState* exec, JSDOMGlobalObject* globalObject, Node* node)
306 {
307 return createWrapperInline(exec, globalObject, node);
308 }
309
toJSNewlyCreated(ExecState * exec,JSDOMGlobalObject * globalObject,Node * node)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