webscriptobject.mm

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) 2004, 2006, 2007, 2008 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */

#import "config.h"
#import "WebScriptObjectPrivate.h"

#import "Console.h"
#import "DOMInternal.h"
#import "DOMWindow.h"
#import "Frame.h"
#import "JSDOMWindow.h"
#import "JSDOMWindowCustom.h"
#import "PlatformString.h"
#import "StringSourceProvider.h"
#import "WebCoreObjCExtras.h"
#import "objc_instance.h"
#import "runtime.h"
#import "runtime_object.h"
#import "runtime_root.h"
#import <JavaScriptCore/APICast.h>
#import <interpreter/CallFrame.h>
#import <runtime/InitializeThreading.h>
#import <runtime/JSGlobalObject.h>
#import <runtime/JSLock.h>
#import <runtime/Completion.h>
#import <runtime/Completion.h>

#ifdef BUILDING_ON_TIGER
typedef unsigned NSUInteger;
#endif

using namespace JSC;
using namespace JSC::Bindings;
using namespace WebCore;

namespace WebCore {

static NSMapTable* JSWrapperCache;

NSObject* getJSWrapper(JSObject* impl)
{
    if (!JSWrapperCache)
        return nil;
    return static_cast<NSObject*>(NSMapGet(JSWrapperCache, impl));
}

void addJSWrapper(NSObject* wrapper, JSObject* impl)
{
    if (!JSWrapperCache)
        JSWrapperCache = createWrapperCache();
    NSMapInsert(JSWrapperCache, impl, wrapper);
}

void removeJSWrapper(JSObject* impl)
{
    if (!JSWrapperCache)
        return;
    NSMapRemove(JSWrapperCache, impl);
}

id createJSWrapper(JSC::JSObject* object, PassRefPtr<JSC::Bindings::RootObject> origin, PassRefPtr<JSC::Bindings::RootObject> root)
{
    if (id wrapper = getJSWrapper(object))
        return [[wrapper retain] autorelease];
    return [[[WebScriptObject alloc] _initWithJSObject:object originRootObject:origin rootObject:root] autorelease];
}

static void addExceptionToConsole(ExecState* exec)
{
    JSDOMWindow* window = asJSDOMWindow(exec->dynamicGlobalObject());
    if (!window || !exec->hadException())
        return;
    reportCurrentException(exec);
}

} // namespace WebCore

@implementation WebScriptObjectPrivate

@end

@implementation WebScriptObject

+ (void)initialize
{
    JSC::initializeThreading();
#ifndef BUILDING_ON_TIGER
    WebCoreObjCFinalizeOnMainThread(self);
#endif
}

+ (id)scriptObjectForJSObject:(JSObjectRef)jsObject originRootObject:(RootObject*)originRootObject rootObject:(RootObject*)rootObject
{
    if (id domWrapper = WebCore::createDOMWrapper(toJS(jsObject), originRootObject, rootObject))
        return domWrapper;
    
    return WebCore::createJSWrapper(toJS(jsObject), originRootObject, rootObject);
}

static void _didExecute(WebScriptObject *obj)
{
    ASSERT(JSLock::lockCount() > 0);
    
    RootObject* root = [obj _rootObject];
    if (!root)
        return;

    ExecState* exec = root->globalObject()->globalExec();
    KJSDidExecuteFunctionPtr func = Instance::didExecuteFunction();
    if (func)
        func(exec, root->globalObject());
}

- (void)_setImp:(JSObject*)imp originRootObject:(PassRefPtr<RootObject>)originRootObject rootObject:(PassRefPtr<RootObject>)rootObject
{
    // This function should only be called once, as a (possibly lazy) initializer.
    ASSERT(!_private->imp);
    ASSERT(!_private->rootObject);
    ASSERT(!_private->originRootObject);
    ASSERT(imp);

    _private->imp = imp;
    _private->rootObject = rootObject.releaseRef();
    _private->originRootObject = originRootObject.releaseRef();

    WebCore::addJSWrapper(self, imp);

    if (_private->rootObject)
        _private->rootObject->gcProtect(imp);
}

- (void)_setOriginRootObject:(PassRefPtr<RootObject>)originRootObject andRootObject:(PassRefPtr<RootObject>)rootObject
{
    ASSERT(_private->imp);

    if (rootObject)
        rootObject->gcProtect(_private->imp);

    if (_private->rootObject && _private->rootObject->isValid())
        _private->rootObject->gcUnprotect(_private->imp);

    if (_private->rootObject)
        _private->rootObject->deref();

    if (_private->originRootObject)
        _private->originRootObject->deref();

    _private->rootObject = rootObject.releaseRef();
    _private->originRootObject = originRootObject.releaseRef();
}

- (id)_initWithJSObject:(JSC::JSObject*)imp originRootObject:(PassRefPtr<JSC::Bindings::RootObject>)originRootObject rootObject:(PassRefPtr<JSC::Bindings::RootObject>)rootObject
{
    ASSERT(imp);

    self = [super init];
    _private = [[WebScriptObjectPrivate alloc] init];
    [self _setImp:imp originRootObject:originRootObject rootObject:rootObject];
    
    return self;
}

- (JSObject*)_imp
{
    // Associate the WebScriptObject with the JS wrapper for the ObjC DOM wrapper.
    // This is done on lazily, on demand.
    if (!_private->imp && _private->isCreatedByDOMWrapper)
        [self _initializeScriptDOMNodeImp];
    return [self _rootObject] ? _private->imp : 0;
}

- (BOOL)_hasImp
{
    return _private->imp != nil;
}

// Node that DOMNode overrides this method. So you should almost always
// use this method call instead of _private->rootObject directly.
- (RootObject*)_rootObject
{
    return _private->rootObject && _private->rootObject->isValid() ? _private->rootObject : 0;
}

- (RootObject *)_originRootObject
{
    return _private->originRootObject && _private->originRootObject->isValid() ? _private->originRootObject : 0;
}

- (BOOL)_isSafeScript
{
    RootObject *root = [self _rootObject];
    if (!root)
        return false;

    if (!_private->originRootObject)
        return true;

    if (!_private->originRootObject->isValid())
        return false;

    return root->globalObject()->allowsAccessFrom(_private->originRootObject->globalObject());
}

- (void)dealloc
{
    if (WebCoreObjCScheduleDeallocateOnMainThread([WebScriptObject class], self))
        return;

    if (_private->imp)
        WebCore::removeJSWrapper(_private->imp);

    if (_private->rootObject && _private->rootObject->isValid())
        _private->rootObject->gcUnprotect(_private->imp);

    if (_private->rootObject)
        _private->rootObject->deref();

    if (_private->originRootObject)
        _private->originRootObject->deref();

    [_private release];

    [super dealloc];
}

- (void)finalize
{
    if (_private->rootObject && _private->rootObject->isValid())
        _private->rootObject->gcUnprotect(_private->imp);

    if (_private->rootObject)
        _private->rootObject->deref();

    if (_private->originRootObject)
        _private->originRootObject->deref();

    [super finalize];
}

+ (BOOL)throwException:(NSString *)exceptionMessage
{
    ObjcInstance::setGlobalException(exceptionMessage);
    return YES;
}

static void getListFromNSArray(ExecState *exec, NSArray *array, RootObject* rootObject, ArgList& aList)
{
    int i, numObjects = array ? [array count] : 0;
    
    for (i = 0; i < numObjects; i++) {
        id anObject = [array objectAtIndex:i];
        aList.append(convertObjcValueToValue(exec, &anObject, ObjcObjectType, rootObject));
    }
}

- (id)callWebScriptMethod:(NSString *)name withArguments:(NSArray *)args
{
    if (![self _isSafeScript])
        return nil;

    JSLock lock(false);
    
    // Look up the function object.
    ExecState* exec = [self _rootObject]->globalObject()->globalExec();
    ASSERT(!exec->hadException());

    JSValuePtr function = [self _imp]->get(exec, Identifier(exec, String(name)));
    CallData callData;
    CallType callType = function.getCallData(callData);
    if (callType == CallTypeNone)
        return nil;

    ArgList argList;
    getListFromNSArray(exec, args, [self _rootObject], argList);

    if (![self _isSafeScript])
        return nil;

    [self _rootObject]->globalObject()->globalData()->timeoutChecker.start();
    JSValuePtr result = call(exec, function, callType, callData, [self _imp], argList);
    [self _rootObject]->globalObject()->globalData()->timeoutChecker.stop();

    if (exec->hadException()) {
        addExceptionToConsole(exec);
        result = jsUndefined();
        exec->clearException();
    }

    // Convert and return the result of the function call.
    id resultObj = [WebScriptObject _convertValueToObjcValue:result originRootObject:[self _originRootObject] rootObject:[self _rootObject]];

    _didExecute(self);
        
    return resultObj;
}

- (id)evaluateWebScript:(NSString *)script
{
    if (![self _isSafeScript])
        return nil;
    
    ExecState* exec = [self _rootObject]->globalObject()->globalExec();
    ASSERT(!exec->hadException());