jsdombinding.cpp

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

/*
 *  Copyright (C) 1999-2001 Harri Porten ([e-mail])
 *  Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
 *  Copyright (C) 2007 Samuel Weinig <[e-mail]>
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

// gcc 3.x can't handle including the HashMap pointer specialization in this file
#if defined __GNUC__ && !defined __GLIBCXX__ // less than gcc 3.4
#define HASH_MAP_PTR_SPEC_WORKAROUND 1
#endif

#include "config.h"
#include "JSDOMBinding.h"

#include "ActiveDOMObject.h"
#include "DOMCoreException.h"
#include "Document.h"
#include "EventException.h"
#include "ExceptionCode.h"
#include "Frame.h"
#include "HTMLImageElement.h"
#include "HTMLNames.h"
#include "JSDOMCoreException.h"
#include "JSDOMWindowCustom.h"
#include "JSEventException.h"
#include "JSNode.h"
#include "JSRangeException.h"
#include "JSXMLHttpRequestException.h"
#include "KURL.h"
#include "MessagePort.h"
#include "RangeException.h"
#include "ScriptController.h"
#include "XMLHttpRequestException.h"
#include <runtime/PrototypeFunction.h>
#include <wtf/StdLibExtras.h>

#if ENABLE(SVG)
#include "JSSVGException.h"
#include "SVGException.h"
#endif

#if ENABLE(XPATH)
#include "JSXPathException.h"
#include "XPathException.h"
#endif

#if ENABLE(WORKERS)
#include <wtf/ThreadSpecific.h>
using namespace WTF;
#endif

using namespace JSC;

namespace WebCore {

using namespace HTMLNames;

typedef Document::JSWrapperCache JSWrapperCache;

// For debugging, keep a set of wrappers currently registered, and check that
// all are unregistered before they are destroyed. This has helped us fix at
// least one bug.

static void addWrapper(DOMObject* wrapper);
static void removeWrapper(DOMObject* wrapper);
static void removeWrappers(const JSWrapperCache& wrappers);

#ifdef NDEBUG

static inline void addWrapper(DOMObject*)
{
}

static inline void removeWrapper(DOMObject*)
{
}

static inline void removeWrappers(const JSWrapperCache&)
{
}

#else

static HashSet<DOMObject*>& wrapperSet()
{
#if ENABLE(WORKERS)
    DEFINE_STATIC_LOCAL(ThreadSpecific<HashSet<DOMObject*> >, staticWrapperSet, ());
    return *staticWrapperSet;
#else
    DEFINE_STATIC_LOCAL(HashSet<DOMObject*>, staticWrapperSet, ());
    return staticWrapperSet;
#endif
}

static void addWrapper(DOMObject* wrapper)
{
    ASSERT(!wrapperSet().contains(wrapper));
    wrapperSet().add(wrapper);
}

static void removeWrapper(DOMObject* wrapper)
{
    if (!wrapper)
        return;
    ASSERT(wrapperSet().contains(wrapper));
    wrapperSet().remove(wrapper);
}

static void removeWrappers(const JSWrapperCache& wrappers)
{
    for (JSWrapperCache::const_iterator it = wrappers.begin(); it != wrappers.end(); ++it)
        removeWrapper(it->second);
}

DOMObject::~DOMObject()
{
    ASSERT(!wrapperSet().contains(this));
}

#endif

class DOMObjectWrapperMap {
public:
    static DOMObjectWrapperMap& mapFor(JSGlobalData&);

    DOMObject* get(void* objectHandle)
    {
        return m_map.get(objectHandle);
    }

    void set(void* objectHandle, DOMObject* wrapper)
    {
        addWrapper(wrapper);
        m_map.set(objectHandle, wrapper);
    }

    void remove(void* objectHandle)
    {
        removeWrapper(m_map.take(objectHandle));
    }

private:
    HashMap<void*, DOMObject*> m_map;
};

// Map from static HashTable instances to per-GlobalData ones.
class DOMObjectHashTableMap {
public:
    static DOMObjectHashTableMap& mapFor(JSGlobalData&);

    ~DOMObjectHashTableMap()
    {
        HashMap<const JSC::HashTable*, JSC::HashTable>::iterator mapEnd = m_map.end();
        for (HashMap<const JSC::HashTable*, JSC::HashTable>::iterator iter = m_map.begin(); iter != m_map.end(); ++iter)
            iter->second.deleteTable();
    }

    const JSC::HashTable* get(const JSC::HashTable* staticTable)
    {
        HashMap<const JSC::HashTable*, JSC::HashTable>::iterator iter = m_map.find(staticTable);
        if (iter != m_map.end())
            return &iter->second;
        return &m_map.set(staticTable, JSC::HashTable(*staticTable)).first->second;
    }

private:
    HashMap<const JSC::HashTable*, JSC::HashTable> m_map;
};

class WebCoreJSClientData : public JSGlobalData::ClientData {
public:
    DOMObjectHashTableMap hashTableMap;
    DOMObjectWrapperMap wrapperMap;
};

DOMObjectHashTableMap& DOMObjectHashTableMap::mapFor(JSGlobalData& globalData)
{
    JSGlobalData::ClientData* clientData = globalData.clientData;
    if (!clientData) {
        clientData = new WebCoreJSClientData;
        globalData.clientData = clientData;
    }
    return static_cast<WebCoreJSClientData*>(clientData)->hashTableMap;
}

const JSC::HashTable* getHashTableForGlobalData(JSGlobalData& globalData, const JSC::HashTable* staticTable)
{
    return DOMObjectHashTableMap::mapFor(globalData).get(staticTable);
}

inline DOMObjectWrapperMap& DOMObjectWrapperMap::mapFor(JSGlobalData& globalData)
{
    JSGlobalData::ClientData* clientData = globalData.clientData;
    if (!clientData) {
        clientData = new WebCoreJSClientData;
        globalData.clientData = clientData;
    }
    return static_cast<WebCoreJSClientData*>(clientData)->wrapperMap;
}

DOMObject* getCachedDOMObjectWrapper(JSGlobalData& globalData, void* objectHandle) 
{
    return DOMObjectWrapperMap::mapFor(globalData).get(objectHandle);
}

void cacheDOMObjectWrapper(JSGlobalData& globalData, void* objectHandle, DOMObject* wrapper) 
{
    DOMObjectWrapperMap::mapFor(globalData).set(objectHandle, wrapper);
}

void forgetDOMObject(JSGlobalData& globalData, void* objectHandle)
{
    DOMObjectWrapperMap::mapFor(globalData).remove(objectHandle);
}

JSNode* getCachedDOMNodeWrapper(Document* document, Node* node)
{
    if (!document)
        return static_cast<JSNode*>(DOMObjectWrapperMap::mapFor(*JSDOMWindow::commonJSGlobalData()).get(node));
    return document->wrapperCache().get(node);
}

void forgetDOMNode(Document* document, Node* node)
{
    if (!document) {
        DOMObjectWrapperMap::mapFor(*JSDOMWindow::commonJSGlobalData()).remove(node);
        return;
    }
    removeWrapper(document->wrapperCache().take(node));
}

void cacheDOMNodeWrapper(Document* document, Node* node, JSNode* wrapper)
{
    if (!document) {
        DOMObjectWrapperMap::mapFor(*JSDOMWindow::commonJSGlobalData()).set(node, wrapper);
        return;
    }
    addWrapper(wrapper);
    document->wrapperCache().set(node, wrapper);
}

void forgetAllDOMNodesForDocument(Document* document)
{
    ASSERT(document);
    removeWrappers(document->wrapperCache());
}

void markDOMNodesForDocument(Document* doc)
{
    // If a node's JS wrapper holds custom properties, those properties must
    // persist every time the node is fetched from the DOM. So, we keep JS
    // wrappers like that from being garbage collected.

    JSWrapperCache& nodeDict = doc->wrapperCache();
    JSWrapperCache::iterator nodeEnd = nodeDict.end();
    for (JSWrapperCache::iterator nodeIt = nodeDict.begin(); nodeIt != nodeEnd; ++nodeIt) {