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/platform/external/webkit/WebCore/bindings/js/JSDOMBinding.cpp

https://github.com/aharish/totoro-gb-opensource-update2
C++ | 863 lines | 672 code | 125 blank | 66 comment | 121 complexity | 5b1a3a5fab8e52428538d5f8c1ba0416 MD5 | raw file
  1/*
  2 *  Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
  3 *  Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  4 *  Copyright (C) 2007 Samuel Weinig <sam@webkit.org>
  5 *
  6 *  This library is free software; you can redistribute it and/or
  7 *  modify it under the terms of the GNU Lesser General Public
  8 *  License as published by the Free Software Foundation; either
  9 *  version 2 of the License, or (at your option) any later version.
 10 *
 11 *  This library is distributed in the hope that it will be useful,
 12 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 13 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 14 *  Lesser General Public License for more details.
 15 *
 16 *  You should have received a copy of the GNU Lesser General Public
 17 *  License along with this library; if not, write to the Free Software
 18 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 19 */
 20
 21#include "config.h"
 22#include "JSDOMBinding.h"
 23
 24#include "debugger/DebuggerCallFrame.h"
 25
 26#include "ActiveDOMObject.h"
 27#include "DOMCoreException.h"
 28#include "Document.h"
 29#include "EventException.h"
 30#include "ExceptionBase.h"
 31#include "ExceptionCode.h"
 32#include "Frame.h"
 33#include "HTMLAudioElement.h"
 34#include "HTMLCanvasElement.h"
 35#include "HTMLImageElement.h"
 36#include "HTMLScriptElement.h"
 37#include "HTMLNames.h"
 38#include "JSDOMCoreException.h"
 39#include "JSDOMWindowCustom.h"
 40#include "JSEventException.h"
 41#include "JSExceptionBase.h"
 42#include "JSNode.h"
 43#include "JSRangeException.h"
 44#include "JSXMLHttpRequestException.h"
 45#include "KURL.h"
 46#include "MessagePort.h"
 47#include "RangeException.h"
 48#include "ScriptCachedFrameData.h"
 49#include "ScriptController.h"
 50#include "Settings.h"
 51#include "XMLHttpRequestException.h"
 52#include <runtime/DateInstance.h>
 53#include <runtime/Error.h>
 54#include <runtime/JSFunction.h>
 55#include <runtime/PrototypeFunction.h>
 56#include <wtf/MathExtras.h>
 57#include <wtf/StdLibExtras.h>
 58
 59#if ENABLE(SVG)
 60#include "JSSVGException.h"
 61#include "SVGException.h"
 62#endif
 63
 64#if ENABLE(XPATH)
 65#include "JSXPathException.h"
 66#include "XPathException.h"
 67#endif
 68
 69#if ENABLE(WORKERS)
 70#include <wtf/ThreadSpecific.h>
 71using namespace WTF;
 72#endif
 73
 74using namespace JSC;
 75
 76namespace WebCore {
 77
 78using namespace HTMLNames;
 79
 80typedef Document::JSWrapperCache JSWrapperCache;
 81typedef Document::JSWrapperCacheMap JSWrapperCacheMap;
 82
 83inline JSWrapperCache* Document::getWrapperCache(DOMWrapperWorld* world)
 84{
 85    if (world->isNormal()) {
 86        if (JSWrapperCache* wrapperCache = m_normalWorldWrapperCache)
 87            return wrapperCache;
 88        ASSERT(!m_wrapperCacheMap.contains(world));
 89    } else if (JSWrapperCache* wrapperCache = m_wrapperCacheMap.get(world))
 90        return wrapperCache;
 91    return createWrapperCache(world);
 92}
 93
 94// For debugging, keep a set of wrappers currently cached, and check that
 95// all are uncached before they are destroyed. This helps us catch bugs like:
 96//     - wrappers being deleted without being removed from the cache
 97//     - wrappers being cached twice
 98
 99static void willCacheWrapper(DOMObject* wrapper);
100static void didUncacheWrapper(DOMObject* wrapper);
101
102#ifdef NDEBUG
103
104static inline void willCacheWrapper(DOMObject*)
105{
106}
107
108static inline void didUncacheWrapper(DOMObject*)
109{
110}
111
112#else
113
114static HashSet<DOMObject*>& wrapperSet()
115{
116#if ENABLE(WORKERS)
117    DEFINE_STATIC_LOCAL(ThreadSpecific<HashSet<DOMObject*> >, staticWrapperSet, ());
118    return *staticWrapperSet;
119#else
120    DEFINE_STATIC_LOCAL(HashSet<DOMObject*>, staticWrapperSet, ());
121    return staticWrapperSet;
122#endif
123}
124
125static void willCacheWrapper(DOMObject* wrapper)
126{
127    ASSERT(!wrapperSet().contains(wrapper));
128    wrapperSet().add(wrapper);
129}
130
131static void didUncacheWrapper(DOMObject* wrapper)
132{
133    if (!wrapper)
134        return;
135    ASSERT(wrapperSet().contains(wrapper));
136    wrapperSet().remove(wrapper);
137}
138
139DOMObject::~DOMObject()
140{
141    ASSERT(!wrapperSet().contains(this));
142}
143
144#endif
145
146DOMWrapperWorld::DOMWrapperWorld(JSC::JSGlobalData* globalData, bool isNormal)
147    : m_globalData(globalData)
148    , m_isNormal(isNormal)
149{
150}
151
152DOMWrapperWorld::~DOMWrapperWorld()
153{
154    if (m_globalData) {
155        JSGlobalData::ClientData* clientData = m_globalData->clientData;
156        ASSERT(clientData);
157        static_cast<WebCoreJSClientData*>(clientData)->forgetWorld(this);
158    }
159
160    for (HashSet<Document*>::iterator iter = documentsWithWrappers.begin(); iter != documentsWithWrappers.end(); ++iter)
161        forgetWorldOfDOMNodesForDocument(*iter, this);
162}
163
164class JSGlobalDataWorldIterator {
165public:
166    JSGlobalDataWorldIterator(JSGlobalData* globalData)
167        : m_pos(static_cast<WebCoreJSClientData*>(globalData->clientData)->m_worldSet.begin())
168        , m_end(static_cast<WebCoreJSClientData*>(globalData->clientData)->m_worldSet.end())
169    {
170    }
171
172    operator bool()
173    {
174        return m_pos != m_end;
175    }
176
177    DOMWrapperWorld* operator*()
178    {
179        ASSERT(m_pos != m_end);
180        return *m_pos;
181    }
182
183    DOMWrapperWorld* operator->()
184    {
185        ASSERT(m_pos != m_end);
186        return *m_pos;
187    }
188
189    JSGlobalDataWorldIterator& operator++()
190    {
191        ++m_pos;
192        return *this;
193    }
194
195private:
196    HashSet<DOMWrapperWorld*>::iterator m_pos;
197    HashSet<DOMWrapperWorld*>::iterator m_end;
198};
199
200DOMWrapperWorld* normalWorld(JSC::JSGlobalData& globalData)
201{
202    JSGlobalData::ClientData* clientData = globalData.clientData;
203    ASSERT(clientData);
204    return static_cast<WebCoreJSClientData*>(clientData)->normalWorld();
205}
206
207DOMWrapperWorld* mainThreadNormalWorld()
208{
209    ASSERT(isMainThread());
210    static DOMWrapperWorld* cachedNormalWorld = normalWorld(*JSDOMWindow::commonJSGlobalData());
211    return cachedNormalWorld;
212}
213
214DOMObjectHashTableMap& DOMObjectHashTableMap::mapFor(JSGlobalData& globalData)
215{
216    JSGlobalData::ClientData* clientData = globalData.clientData;
217    ASSERT(clientData);
218    return static_cast<WebCoreJSClientData*>(clientData)->hashTableMap;
219}
220
221const JSC::HashTable* getHashTableForGlobalData(JSGlobalData& globalData, const JSC::HashTable* staticTable)
222{
223    return DOMObjectHashTableMap::mapFor(globalData).get(staticTable);
224}
225
226static inline DOMObjectWrapperMap& DOMObjectWrapperMapFor(JSC::ExecState* exec)
227{
228    return currentWorld(exec)->m_wrappers;
229}
230
231bool hasCachedDOMObjectWrapperUnchecked(JSGlobalData* globalData, void* objectHandle)
232{
233    for (JSGlobalDataWorldIterator worldIter(globalData); worldIter; ++worldIter) {
234        if (worldIter->m_wrappers.uncheckedGet(objectHandle))
235            return true;
236    }
237    return false;
238}
239
240bool hasCachedDOMObjectWrapper(JSGlobalData* globalData, void* objectHandle)
241{
242    for (JSGlobalDataWorldIterator worldIter(globalData); worldIter; ++worldIter) {
243        if (worldIter->m_wrappers.get(objectHandle))
244            return true;
245    }
246    return false;
247}
248
249DOMObject* getCachedDOMObjectWrapper(JSC::ExecState* exec, void* objectHandle) 
250{
251    return DOMObjectWrapperMapFor(exec).get(objectHandle);
252}
253
254void cacheDOMObjectWrapper(JSC::ExecState* exec, void* objectHandle, DOMObject* wrapper) 
255{
256    willCacheWrapper(wrapper);
257    DOMObjectWrapperMapFor(exec).set(objectHandle, wrapper);
258}
259
260bool hasCachedDOMNodeWrapperUnchecked(Document* document, Node* node)
261{
262    if (!document)
263        return hasCachedDOMObjectWrapperUnchecked(JSDOMWindow::commonJSGlobalData(), node);
264
265    JSWrapperCacheMap& wrapperCacheMap = document->wrapperCacheMap();
266    for (JSWrapperCacheMap::iterator iter = wrapperCacheMap.begin(); iter != wrapperCacheMap.end(); ++iter) {
267        if (iter->second->uncheckedGet(node))
268            return true;
269    }
270    return false;
271}
272
273JSNode* getCachedDOMNodeWrapper(JSC::ExecState* exec, Document* document, Node* node)
274{
275    if (document)
276        return document->getWrapperCache(currentWorld(exec))->get(node);
277    return static_cast<JSNode*>(DOMObjectWrapperMapFor(exec).get(node));
278}
279
280void forgetDOMObject(DOMObject* wrapper, void* objectHandle)
281{
282    JSC::JSGlobalData* globalData = Heap::heap(wrapper)->globalData();
283
284    // Check the normal world first!
285    JSGlobalData::ClientData* clientData = globalData->clientData;
286    ASSERT(clientData);
287    DOMObjectWrapperMap& wrappers = static_cast<WebCoreJSClientData*>(clientData)->normalWorld()->m_wrappers;
288    if (wrappers.uncheckedRemove(objectHandle, wrapper)) {
289        didUncacheWrapper(wrapper);
290        return;
291    }
292
293    // We can't guarantee that a wrapper is in the cache when it uncaches itself,
294    // since a new wrapper may be cached before the old wrapper's destructor runs.
295    for (JSGlobalDataWorldIterator worldIter(globalData); worldIter; ++worldIter) {
296        if (worldIter->m_wrappers.uncheckedRemove(objectHandle, wrapper))
297            break;
298    }
299    didUncacheWrapper(wrapper);
300}
301
302void forgetDOMNode(JSNode* wrapper, Node* node, Document* document)
303{
304    if (!document) {
305        forgetDOMObject(wrapper, node);
306        return;
307    }
308
309    // We can't guarantee that a wrapper is in the cache when it uncaches itself,
310    // since a new wrapper may be cached before the old wrapper's destructor runs.
311    JSWrapperCacheMap& wrapperCacheMap = document->wrapperCacheMap();
312    for (JSWrapperCacheMap::iterator wrappersIter = wrapperCacheMap.begin(); wrappersIter != wrapperCacheMap.end(); ++wrappersIter) {
313        if (wrappersIter->second->uncheckedRemove(node, wrapper))
314            break;
315    }
316    didUncacheWrapper(wrapper);
317}
318
319void cacheDOMNodeWrapper(JSC::ExecState* exec, Document* document, Node* node, JSNode* wrapper)
320{
321    if (!document) {
322        willCacheWrapper(wrapper);
323        DOMObjectWrapperMapFor(exec).set(node, wrapper);
324        return;
325    }
326    willCacheWrapper(wrapper);
327    document->getWrapperCache(currentWorld(exec))->set(node, wrapper);
328}
329
330void forgetAllDOMNodesForDocument(Document* document)
331{
332    ASSERT(document);
333    JSWrapperCacheMap& wrapperCacheMap = document->wrapperCacheMap();
334    JSWrapperCacheMap::const_iterator wrappersMapEnd = wrapperCacheMap.end();
335    for (JSWrapperCacheMap::const_iterator wrappersMapIter = wrapperCacheMap.begin(); wrappersMapIter != wrappersMapEnd; ++wrappersMapIter) {
336        delete wrappersMapIter->second;
337        wrappersMapIter->first->forgetDocument(document);
338    }
339}
340
341void forgetWorldOfDOMNodesForDocument(Document* document, DOMWrapperWorld* world)
342{
343    JSWrapperCache* wrappers = document->wrapperCacheMap().take(world);
344    ASSERT(wrappers); // 'world' should only know about 'document' if 'document' knows about 'world'!
345    delete wrappers;
346}
347
348static inline bool isObservableThroughDOM(JSNode* jsNode, DOMWrapperWorld* world)
349{
350    // Certain conditions implicitly make a JS DOM node wrapper observable
351    // through the DOM, even if no explicit reference to it remains.
352
353    Node* node = jsNode->impl();
354
355    if (node->inDocument()) {
356        // If a node is in the document, and its wrapper has custom properties,
357        // the wrapper is observable because future access to the node through the
358        // DOM must reflect those properties.
359        if (jsNode->hasCustomProperties())
360            return true;
361
362        // If a node is in the document, and has event listeners, its wrapper is
363        // observable because its wrapper is responsible for marking those event listeners.
364        if (node->hasEventListeners())
365            return true; // Technically, we may overzealously mark a wrapper for a node that has only non-JS event listeners. Oh well.
366
367        // If a node owns another object with a wrapper with custom properties,
368        // the wrapper must be treated as observable, because future access to
369        // those objects through the DOM must reflect those properties.
370        // FIXME: It would be better if this logic could be in the node next to
371        // the custom markChildren functions rather than here.
372        if (node->isElementNode()) {
373            if (NamedNodeMap* attributes = static_cast<Element*>(node)->attributeMap()) {
374                if (DOMObject* wrapper = world->m_wrappers.uncheckedGet(attributes)) {
375                    if (wrapper->hasCustomProperties())
376                        return true;
377                }
378            }
379            if (node->isStyledElement()) {
380                if (CSSMutableStyleDeclaration* style = static_cast<StyledElement*>(node)->inlineStyleDecl()) {
381                    if (DOMObject* wrapper = world->m_wrappers.uncheckedGet(style)) {
382                        if (wrapper->hasCustomProperties())
383                            return true;
384                    }
385                }
386            }
387            if (static_cast<Element*>(node)->hasTagName(canvasTag)) {
388                if (CanvasRenderingContext* context = static_cast<HTMLCanvasElement*>(node)->renderingContext()) {
389                    if (DOMObject* wrapper = world->m_wrappers.uncheckedGet(context)) {
390                        if (wrapper->hasCustomProperties())
391                            return true;
392                    }
393                }
394            }
395        }
396    } else {
397        // If a wrapper is the last reference to an image or script element
398        // that is loading but not in the document, the wrapper is observable
399        // because it is the only thing keeping the image element alive, and if
400        // the image element is destroyed, its load event will not fire.
401        // FIXME: The DOM should manage this issue without the help of JavaScript wrappers.
402        if (node->hasTagName(imgTag) && !static_cast<HTMLImageElement*>(node)->haveFiredLoadEvent())
403            return true;
404        if (node->hasTagName(scriptTag) && !static_cast<HTMLScriptElement*>(node)->haveFiredLoadEvent())
405            return true;
406#if ENABLE(VIDEO)
407        if (node->hasTagName(audioTag) && !static_cast<HTMLAudioElement*>(node)->paused())
408            return true;
409#endif
410    }
411
412    // If a node is firing event listeners, its wrapper is observable because
413    // its wrapper is responsible for marking those event listeners.
414    if (node->isFiringEventListeners())
415        return true;
416
417    return false;
418}
419
420void markDOMNodesForDocument(MarkStack& markStack, Document* document)
421{
422    JSWrapperCacheMap& wrapperCacheMap = document->wrapperCacheMap();
423    for (JSWrapperCacheMap::iterator wrappersIter = wrapperCacheMap.begin(); wrappersIter != wrapperCacheMap.end(); ++wrappersIter) {
424        DOMWrapperWorld* world = wrappersIter->first;
425        JSWrapperCache* nodeDict = wrappersIter->second;
426
427        JSWrapperCache::iterator nodeEnd = nodeDict->uncheckedEnd();
428        for (JSWrapperCache::iterator nodeIt = nodeDict->uncheckedBegin(); nodeIt != nodeEnd; ++nodeIt) {
429            JSNode* jsNode = nodeIt->second;
430            if (isObservableThroughDOM(jsNode, world))
431                markStack.append(jsNode);
432        }
433    }
434}
435
436void markActiveObjectsForContext(MarkStack& markStack, JSGlobalData& globalData, ScriptExecutionContext* scriptExecutionContext)
437{
438    // If an element has pending activity that may result in event listeners being called
439    // (e.g. an XMLHttpRequest), we need to keep JS wrappers alive.
440
441    const HashMap<ActiveDOMObject*, void*>& activeObjects = scriptExecutionContext->activeDOMObjects();
442    HashMap<ActiveDOMObject*, void*>::const_iterator activeObjectsEnd = activeObjects.end();
443    for (HashMap<ActiveDOMObject*, void*>::const_iterator iter = activeObjects.begin(); iter != activeObjectsEnd; ++iter) {
444        if (iter->first->hasPendingActivity()) {
445            // Generally, an active object with pending activity must have a wrapper to mark its listeners.
446            // However, some ActiveDOMObjects don't have JS wrappers.
447            markDOMObjectWrapper(markStack, globalData, iter->second);
448        }
449    }
450
451    const HashSet<MessagePort*>& messagePorts = scriptExecutionContext->messagePorts();
452    HashSet<MessagePort*>::const_iterator portsEnd = messagePorts.end();
453    for (HashSet<MessagePort*>::const_iterator iter = messagePorts.begin(); iter != portsEnd; ++iter) {
454        // If the message port is remotely entangled, then always mark it as in-use because we can't determine reachability across threads.
455        if (!(*iter)->locallyEntangledPort() || (*iter)->hasPendingActivity())
456            markDOMObjectWrapper(markStack, globalData, *iter);
457    }
458}
459
460typedef std::pair<JSNode*, DOMWrapperWorld*> WrapperAndWorld;
461typedef WTF::Vector<WrapperAndWorld, 8> WrapperSet;
462
463static inline void takeWrappers(Node* node, Document* document, WrapperSet& wrapperSet)
464{
465    if (document) {
466        JSWrapperCacheMap& wrapperCacheMap = document->wrapperCacheMap();
467        for (JSWrapperCacheMap::iterator iter = wrapperCacheMap.begin(); iter != wrapperCacheMap.end(); ++iter) {
468            if (JSNode* wrapper = iter->second->take(node)) {
469                didUncacheWrapper(wrapper);
470                wrapperSet.append(WrapperAndWorld(wrapper, iter->first));
471            }
472        }
473    } else {
474        for (JSGlobalDataWorldIterator worldIter(JSDOMWindow::commonJSGlobalData()); worldIter; ++worldIter) {
475            DOMWrapperWorld* world = *worldIter;
476            if (JSNode* wrapper = static_cast<JSNode*>(world->m_wrappers.take(node))) {
477                didUncacheWrapper(wrapper);
478                wrapperSet.append(WrapperAndWorld(wrapper, world));
479            }
480        }
481    }
482}
483
484void updateDOMNodeDocument(Node* node, Document* oldDocument, Document* newDocument)
485{
486    ASSERT(oldDocument != newDocument);
487
488    WrapperSet wrapperSet;
489    takeWrappers(node, oldDocument, wrapperSet);
490
491    for (unsigned i = 0; i < wrapperSet.size(); ++i) {
492        JSNode* wrapper = wrapperSet[i].first;
493        willCacheWrapper(wrapper);
494        if (newDocument)
495            newDocument->getWrapperCache(wrapperSet[i].second)->set(node, wrapper);
496        else
497            wrapperSet[i].second->m_wrappers.set(node, wrapper);
498    }
499}
500
501void markDOMObjectWrapper(MarkStack& markStack, JSGlobalData& globalData, void* object)
502{
503    // FIXME: This could be changed to only mark wrappers that are "observable"
504    // as markDOMNodesForDocument does, allowing us to collect more wrappers,
505    // but doing this correctly would be challenging.
506    if (!object)
507        return;
508
509    for (JSGlobalDataWorldIterator worldIter(&globalData); worldIter; ++worldIter) {
510        if (DOMObject* wrapper = worldIter->m_wrappers.uncheckedGet(object))
511            markStack.append(wrapper);
512    }
513}
514
515void markDOMNodeWrapper(MarkStack& markStack, Document* document, Node* node)
516{
517    if (document) {
518        JSWrapperCacheMap& wrapperCacheMap = document->wrapperCacheMap();
519        for (JSWrapperCacheMap::iterator iter = wrapperCacheMap.begin(); iter != wrapperCacheMap.end(); ++iter) {
520            if (JSNode* wrapper = iter->second->uncheckedGet(node))
521                markStack.append(wrapper);
522        }
523        return;
524    }
525
526    for (JSGlobalDataWorldIterator worldIter(JSDOMWindow::commonJSGlobalData()); worldIter; ++worldIter) {
527        if (DOMObject* wrapper = worldIter->m_wrappers.uncheckedGet(node))
528            markStack.append(wrapper);
529    }
530}
531
532static void stringWrapperDestroyed(JSString* str, void* context)
533{
534    StringImpl* cacheKey = static_cast<StringImpl*>(context);
535    JSC::JSGlobalData* globalData = Heap::heap(str)->globalData();
536
537    // Check the normal world first!
538    JSGlobalData::ClientData* clientData = globalData->clientData;
539    ASSERT(clientData);
540    JSStringCache& cache = static_cast<WebCoreJSClientData*>(clientData)->normalWorld()->m_stringCache;
541    if (cache.uncheckedRemove(cacheKey, str)) {
542        cacheKey->deref();
543        return;
544    }
545
546    for (JSGlobalDataWorldIterator worldIter(globalData); worldIter; ++worldIter) {
547        if (worldIter->m_stringCache.uncheckedRemove(cacheKey, str))
548            break;
549    }
550
551    cacheKey->deref();
552}
553
554JSValue jsStringSlowCase(ExecState* exec, JSStringCache& stringCache, StringImpl* stringImpl)
555{
556    // If there is a stale entry, we have to explicitly remove it to avoid
557    // problems down the line.
558    if (JSString* wrapper = stringCache.uncheckedGet(stringImpl))
559        stringCache.uncheckedRemove(stringImpl, wrapper);
560
561    JSString* wrapper = jsStringWithFinalizer(exec, stringImpl->ustring(), stringWrapperDestroyed, stringImpl);
562    stringCache.set(stringImpl, wrapper);
563    // ref explicitly instead of using a RefPtr-keyed hashtable because the wrapper can
564    // outlive the cache, so the stringImpl has to match the wrapper's lifetime.
565    stringImpl->ref();
566    return wrapper;
567}
568
569JSValue jsStringOrNull(ExecState* exec, const String& s)
570{
571    if (s.isNull())
572        return jsNull();
573    return jsString(exec, s);
574}
575
576JSValue jsOwnedStringOrNull(ExecState* exec, const UString& s)
577{
578    if (s.isNull())
579        return jsNull();
580    return jsOwnedString(exec, s);
581}
582
583JSValue jsStringOrUndefined(ExecState* exec, const String& s)
584{
585    if (s.isNull())
586        return jsUndefined();
587    return jsString(exec, s);
588}
589
590JSValue jsStringOrFalse(ExecState* exec, const String& s)
591{
592    if (s.isNull())
593        return jsBoolean(false);
594    return jsString(exec, s);
595}
596
597JSValue jsString(ExecState* exec, const KURL& url)
598{
599    return jsString(exec, url.string());
600}
601
602JSValue jsStringOrNull(ExecState* exec, const KURL& url)
603{
604    if (url.isNull())
605        return jsNull();
606    return jsString(exec, url.string());
607}
608
609JSValue jsStringOrUndefined(ExecState* exec, const KURL& url)
610{
611    if (url.isNull())
612        return jsUndefined();
613    return jsString(exec, url.string());
614}
615
616JSValue jsStringOrFalse(ExecState* exec, const KURL& url)
617{
618    if (url.isNull())
619        return jsBoolean(false);
620    return jsString(exec, url.string());
621}
622
623UString valueToStringWithNullCheck(ExecState* exec, JSValue value)
624{
625    if (value.isNull())
626        return UString();
627    return value.toString(exec);
628}
629
630UString valueToStringWithUndefinedOrNullCheck(ExecState* exec, JSValue value)
631{
632    if (value.isUndefinedOrNull())
633        return UString();
634    return value.toString(exec);
635}
636
637JSValue jsDateOrNull(ExecState* exec, double value)
638{
639    if (!isfinite(value))
640        return jsNull();
641    return new (exec) DateInstance(exec, value);
642}
643
644double valueToDate(ExecState* exec, JSValue value)
645{
646    if (value.isNumber())
647        return value.uncheckedGetNumber();
648    if (!value.inherits(&DateInstance::info))
649        return std::numeric_limits<double>::quiet_NaN();
650    return static_cast<DateInstance*>(value.toObject(exec))->internalNumber();
651}
652
653void reportException(ExecState* exec, JSValue exception)
654{
655    UString errorMessage = exception.toString(exec);
656    JSObject* exceptionObject = exception.toObject(exec);
657    int lineNumber = exceptionObject->get(exec, Identifier(exec, "line")).toInt32(exec);
658    UString exceptionSourceURL = exceptionObject->get(exec, Identifier(exec, "sourceURL")).toString(exec);
659    exec->clearException();
660
661    if (ExceptionBase* exceptionBase = toExceptionBase(exception))
662        errorMessage = exceptionBase->message() + ": "  + exceptionBase->description();
663
664    ScriptExecutionContext* scriptExecutionContext = static_cast<JSDOMGlobalObject*>(exec->lexicalGlobalObject())->scriptExecutionContext();
665    ASSERT(scriptExecutionContext);
666
667    // Crash data indicates null-dereference crashes at this point in the Safari 4 Public Beta.
668    // It's harmless to return here without reporting the exception to the log and the debugger in this case.
669    if (!scriptExecutionContext)
670        return;
671
672    scriptExecutionContext->reportException(errorMessage, lineNumber, exceptionSourceURL);
673}
674
675void reportCurrentException(ExecState* exec)
676{
677    JSValue exception = exec->exception();
678    exec->clearException();
679    reportException(exec, exception);
680}
681
682void setDOMException(ExecState* exec, ExceptionCode ec)
683{
684    if (!ec || exec->hadException())
685        return;
686
687    // FIXME: All callers to setDOMException need to pass in the right global object
688    // for now, we're going to assume the lexicalGlobalObject.  Which is wrong in cases like this:
689    // frames[0].document.createElement(null, null); // throws an exception which should have the subframes prototypes.
690    JSDOMGlobalObject* globalObject = deprecatedGlobalObjectForPrototype(exec);
691
692    ExceptionCodeDescription description;
693    getExceptionCodeDescription(ec, description);
694
695    JSValue errorObject;
696    switch (description.type) {
697        case DOMExceptionType:
698            errorObject = toJS(exec, globalObject, DOMCoreException::create(description));
699            break;
700        case RangeExceptionType:
701            errorObject = toJS(exec, globalObject, RangeException::create(description));
702            break;
703        case EventExceptionType:
704            errorObject = toJS(exec, globalObject, EventException::create(description));
705            break;
706        case XMLHttpRequestExceptionType:
707            errorObject = toJS(exec, globalObject, XMLHttpRequestException::create(description));
708            break;
709#if ENABLE(SVG)
710        case SVGExceptionType:
711            errorObject = toJS(exec, globalObject, SVGException::create(description).get(), 0 /* no context on purpose */);
712            break;
713#endif
714#if ENABLE(XPATH)
715        case XPathExceptionType:
716            errorObject = toJS(exec, globalObject, XPathException::create(description));
717            break;
718#endif
719    }
720
721    ASSERT(errorObject);
722    exec->setException(errorObject);
723}
724
725bool checkNodeSecurity(ExecState* exec, Node* node)
726{
727    return node && allowsAccessFromFrame(exec, node->document()->frame());
728}
729
730bool allowsAccessFromFrame(ExecState* exec, Frame* frame)
731{
732    if (!frame)
733        return false;
734    JSDOMWindow* window = toJSDOMWindow(frame, currentWorld(exec));
735    return window && window->allowsAccessFrom(exec);
736}
737
738bool allowsAccessFromFrame(ExecState* exec, Frame* frame, String& message)
739{
740    if (!frame)
741        return false;
742    JSDOMWindow* window = toJSDOMWindow(frame, currentWorld(exec));
743    return window && window->allowsAccessFrom(exec, message);
744}
745
746bool shouldAllowNavigation(ExecState* exec, Frame* frame)
747{
748    Frame* lexicalFrame = toLexicalFrame(exec);
749    return lexicalFrame && lexicalFrame->loader()->shouldAllowNavigation(frame);
750}
751
752void printErrorMessageForFrame(Frame* frame, const String& message)
753{
754    if (!frame)
755        return;
756    if (message.isEmpty())
757        return;
758
759    Settings* settings = frame->settings();
760    if (!settings)
761        return;
762    if (settings->privateBrowsingEnabled())
763        return;
764
765    frame->domWindow()->console()->addMessage(JSMessageSource, LogMessageType, ErrorMessageLevel, message, 1, String()); // FIXME: provide a real line number and source URL.
766}
767
768Frame* toLexicalFrame(ExecState* exec)
769{
770    return asJSDOMWindow(exec->lexicalGlobalObject())->impl()->frame();
771}
772
773Frame* toDynamicFrame(ExecState* exec)
774{
775    return asJSDOMWindow(exec->dynamicGlobalObject())->impl()->frame();
776}
777
778bool processingUserGesture(ExecState* exec)
779{
780    Frame* frame = toDynamicFrame(exec);
781    return frame && frame->script()->processingUserGesture(currentWorld(exec));
782}
783
784KURL completeURL(ExecState* exec, const String& relativeURL)
785{
786    // For historical reasons, we need to complete the URL using the dynamic frame.
787    Frame* frame = toDynamicFrame(exec);
788    if (!frame)
789        return KURL();
790    return frame->loader()->completeURL(relativeURL);
791}
792
793JSValue objectToStringFunctionGetter(ExecState* exec, const Identifier& propertyName, const PropertySlot&)
794{
795    return new (exec) NativeFunctionWrapper(exec, exec->lexicalGlobalObject()->prototypeFunctionStructure(), 0, propertyName, objectProtoFuncToString);
796}
797
798Structure* getCachedDOMStructure(JSDOMGlobalObject* globalObject, const ClassInfo* classInfo)
799{
800    JSDOMStructureMap& structures = globalObject->structures();
801    return structures.get(classInfo).get();
802}
803
804Structure* cacheDOMStructure(JSDOMGlobalObject* globalObject, NonNullPassRefPtr<Structure> structure, const ClassInfo* classInfo)
805{
806    JSDOMStructureMap& structures = globalObject->structures();
807    ASSERT(!structures.contains(classInfo));
808    return structures.set(classInfo, structure).first->second.get();
809}
810
811Structure* getCachedDOMStructure(ExecState* exec, const ClassInfo* classInfo)
812{
813    return getCachedDOMStructure(static_cast<JSDOMGlobalObject*>(exec->lexicalGlobalObject()), classInfo);
814}
815
816Structure* cacheDOMStructure(ExecState* exec, NonNullPassRefPtr<Structure> structure, const ClassInfo* classInfo)
817{
818    return cacheDOMStructure(static_cast<JSDOMGlobalObject*>(exec->lexicalGlobalObject()), structure, classInfo);
819}
820
821JSObject* getCachedDOMConstructor(ExecState* exec, const ClassInfo* classInfo)
822{
823    JSDOMConstructorMap& constructors = static_cast<JSDOMGlobalObject*>(exec->lexicalGlobalObject())->constructors();
824    return constructors.get(classInfo);
825}
826
827void cacheDOMConstructor(ExecState* exec, const ClassInfo* classInfo, JSObject* constructor)
828{
829    JSDOMConstructorMap& constructors = static_cast<JSDOMGlobalObject*>(exec->lexicalGlobalObject())->constructors();
830    ASSERT(!constructors.contains(classInfo));
831    constructors.set(classInfo, constructor);
832}
833
834JSC::JSObject* toJSSequence(ExecState* exec, JSValue value, unsigned& length)
835{
836    JSObject* object = value.getObject();
837    if (!object) {
838        throwError(exec, TypeError);
839        return 0;
840    }
841    JSValue lengthValue = object->get(exec, exec->propertyNames().length);
842    if (exec->hadException())
843        return 0;
844
845    if (lengthValue.isUndefinedOrNull()) {
846        throwError(exec, TypeError);
847        return 0;
848    }
849
850    length = lengthValue.toUInt32(exec);
851    if (exec->hadException())
852        return 0;
853
854    return object;
855}
856
857bool DOMObject::defineOwnProperty(ExecState* exec, const Identifier&, PropertyDescriptor&, bool)
858{
859    throwError(exec, TypeError, "defineProperty is not supported on DOM Objects");
860    return false;
861}
862
863} // namespace WebCore