Use the IDA and LLDB explore WebCore C + + class inheritance

浏览数：39 / 时间：2015年06月12日

原文：http://www.phonesdevelopers.com/1781016/

The surgery class named PluginWidgetIOS use lldb can get:

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(lldb)?image?lookup?-r?-s?PluginWidgetIOS??
7?symbols?match?the?regular?expression?‘PluginWidgetIOS‘?in?/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator6.1.sdk/System/Library/PrivateFrameworks/WebKit.framework/WebKit:??
????????Address:?WebKit[0x0003a5a0]?(WebKit.TEXT.text?+?231680)??
????????Summary:?WebKitPluginWidgetIOS::~PluginWidgetIOS()&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Address:&nbsp;WebKit[0x0003a5b0]&nbsp;(WebKit.__TEXT.__text&nbsp;+&nbsp;231696)&nbsp;&nbsp;</span>
 </li>
 <li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; list-style: decimal-leading-zero outside; color: inherit; line-height: 18px; margin: 0px !important; padding: 0px 3px 0px 10px !important;" data-iceapw="8" data-iceapc="1">
 <span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;" data-iceapw="8">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Summary:&nbsp;WebKitPluginWidgetIOS::~PluginWidgetIOS()????????Address:?WebKit[0x0003a6f0]?(WebKit.TEXT.text?+?232016)??
????????Summary:?WebKitPluginWidgetIOS::platformLayer()&nbsp;const&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Address:&nbsp;WebKit[0x0003a750]&nbsp;(WebKit.__TEXT.__text&nbsp;+&nbsp;232112)&nbsp;&nbsp;</span>
 </li>
 <li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; list-style: decimal-leading-zero outside; color: inherit; line-height: 18px; margin: 0px !important; padding: 0px 3px 0px 10px !important;" data-iceapw="9" data-iceapc="1">
 <span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;" data-iceapw="9">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Summary:&nbsp;WebKitPluginWidgetIOS::willProvidePluginLayer()?const????????Address:?WebKit[0x0003a7b0]?(WebKit.TEXT.text?+?232208)??
????????Summary:?WebKitPluginWidgetIOS::attachPluginLayer()&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Address:&nbsp;WebKit[0x0003a810]&nbsp;(WebKit.__TEXT.__text&nbsp;+&nbsp;232304)&nbsp;&nbsp;</span>
 </li>
 <li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; list-style: decimal-leading-zero outside; color: inherit; line-height: 18px; margin: 0px !important; padding: 0px 3px 0px 10px !important;" data-iceapw="8" data-iceapc="1">
 <span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;" data-iceapw="8">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Summary:&nbsp;WebKitPluginWidgetIOS::detachPluginLayer()????????Address:?WebKit[0x001335e0]?(WebKit.DATA.data?+?560)??
????????Summary:?vtable?for?PluginWidgetIOS??

Useful?information:

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Address:?WebKit[0x001335e0]?(WebKit.DATA.data?+?560)??
????????Summary:?vtable?for?PluginWidgetIOS??

IDA Open WebCore static library, goto (shortcuts?g) vtable address where 0x1335e0, you can see:

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data:001335E0?;?`vtable?for‘PluginWidgetIOS??
data:001335E0?ZTV15PluginWidgetIOS?db????0??????????;?DATA?XREF:?nlsymbolptr:ZTV15PluginWidgetIOSptro??
data:001335E1?????????????????db????0??
data:001335E2?????????????????db????0??
data:001335E3?????????????????db????0??
data:001335E4?????????????????db????0??
data:001335E5?????????????????db????0??
data:001335E6?????????????????db????0??
data:001335E7?????????????????db????0??
data:001335E8?????????????????dd?offset?ZN15PluginWidgetIOSD1Ev?;?PluginWidgetIOS::~PluginWidgetIOS()??
data:001335EC?????????????????dd?offset?ZN15PluginWidgetIOSD0Ev?;?PluginWidgetIOS::~PluginWidgetIOS()??
data:001335F0?????????????????dd?offset?ZN7WebCore6Widget12setFrameRectERKNS7IntRectE?;?WebCore::Widget::setFrameRect(WebCore::IntRect??const&)??
data:001335F4?????????????????dd?offset?ZN7WebCore6Widget5paintEPNS15GraphicsContextERKNS7IntRectE?;?WebCore::Widget::paint(WebCore::GraphicsContext?,WebCore::IntRect??const&)??
data:001335F8?????????????????dd?offset?ZN12PluginWidget14invalidateRectERKN7WebCore7IntRectE?;?PluginWidget::invalidateRect(WebCore::IntRect??const&)??
data:001335FC?????????????????dd?offset?ZN7WebCore6Widget8setFocusEb?;?WebCore::Widget::setFocus(bool)??
data:00133600?????????????????dd?offset?ZN7WebCore6Widget4showEv?;?WebCore::Widget::show(void)??
data:00133604?????????????????dd?offset?ZN7WebCore6Widget4hideEv?;?WebCore::Widget::hide(void)??
data:00133608?????????????????dd?offset?ZN7WebCore6Widget16setParentVisibleEb?;?WebCore::Widget::setParentVisible(bool)??
data:0013360C?????????????????dd?offset?ZNK7WebCore6Widget11isFrameViewEv?;?WebCore::Widget::isFrameView(void)??
data:00133610?????????????????dd?offset?ZNK7WebCore6Widget12isPluginViewEv?;?WebCore::Widget::isPluginView(void)??
data:00133614?????????????????dd?offset?ZNK7WebCore14PluginViewBase16isPluginViewBaseEv?;?WebCore::PluginViewBase::isPluginViewBase(void)??
data:00133618?????????????????dd?offset?ZNK7WebCore6Widget11isScrollbarEv?;?WebCore::Widget::isScrollbar(void)??
data:0013361C?????????????????dd?offset?ZN7WebCore6Widget9setParentEPNS_10ScrollViewE?;?WebCore::Widget::setParent(WebCore::ScrollView?)??
data:00133620?????????????????dd?offset?ZN7WebCore6Widget11handleEventEPNS5EventE?;?WebCore::Widget::handleEvent(WebCore::Event?*)??
data:00133624?????????????????dd?offset?ZN7WebCore6Widget12notifyWidgetENS18WidgetNotificationE?;?WebCore::Widget::notifyWidget(WebCore::WidgetNotification)??
data:00133628?????????????????dd?offset?ZN7WebCore6Widget17frameRectsChangedEv?;?WebCore::Widget::frameRectsChanged(void)??
data:0013362C?????????????????dd?offset?ZN7WebCore6Widget22widgetPositionsUpdatedEv?;?WebCore::Widget::widgetPositionsUpdated(void)??
data:00133630?????????????????dd?offset?ZN7WebCore6Widget25transformsAffectFrameRectEv?;?WebCore::Widget::transformsAffectFrameRect(void)??
data:00133634?????????????????dd?offset?ZNK7WebCore6Widget23convertToContainingViewERKNS7IntRectE?;?WebCore::Widget::convertToContainingView(WebCore::IntRect??const&)??
data:00133638?????????????????dd?offset?ZNK7WebCore6Widget25convertFromContainingViewERKNS7IntRectE?;?WebCore::Widget::convertFromContainingView(WebCore::IntRect??const&)??
data:0013363C?????????????????dd?offset?ZNK7WebCore6Widget23convertToContainingViewERKNS8IntPointE?;?WebCore::Widget::convertToContainingView(WebCore::IntPoint??const&)??
data:00133640?????????????????dd?offset?ZNK7WebCore6Widget25convertFromContainingViewERKNS8IntPointE?;?WebCore::Widget::convertFromContainingView(WebCore::IntPoint??const&)??
data:00133644?????????????????dd?offset?ZNK7WebCore6Widget13axObjectCacheEv?;?WebCore::Widget::axObjectCache(void)??
data:00133648?????????????????dd?offset?ZNK15PluginWidgetIOS13platformLayerEv?;?PluginWidgetIOS::platformLayer(void)??
data:0013364C?????????????????dd?offset?ZNK15PluginWidgetIOS22willProvidePluginLayerEv?;?PluginWidgetIOS::willProvidePluginLayer(void)??
data:00133650?????????????????dd?offset?ZN15PluginWidgetIOS17attachPluginLayerEv?;?PluginWidgetIOS::attachPluginLayer(void)??
data:00133654?????????????????dd?offset?ZN15PluginWidgetIOS17detachPluginLayerEv?;?PluginWidgetIOS::detachPluginLayer(void)??
data:00133658?????????????????dd?offset?ZN7WebCore14PluginViewBase12scriptObjectEPN3JSC14JSGlobalObjectE?;?WebCore::PluginViewBase::scriptObject(JSC::JSGlobalObject?*)??
data:0013365C?????????????????dd?offset?ZN7WebCore14PluginViewBase27privateBrowsingStateChangedEb?;?WebCore::PluginViewBase::privateBrowsingStateChanged(bool)??
data:00133660?????????????????dd?offset?ZN7WebCore14PluginViewBase12getFormValueERN3WTF6StringE?;?WebCore::PluginViewBase::getFormValue(WTF::String?&)??
data:00133664?????????????????dd?offset?ZN7WebCore14PluginViewBase6scrollENS15ScrollDirectionENS17ScrollGranularityE?;?WebCore::PluginViewBase::scroll(WebCore::ScrollDirection,WebCore::ScrollGranularity)??
data:00133668?????????????????dd?offset?ZN7WebCore14PluginViewBase19horizontalScrollbarEv?;?WebCore::PluginViewBase::horizontalScrollbar(void)??
data:0013366C?????????????????dd?offset?ZN7WebCore14PluginViewBase17verticalScrollbarEv?;?WebCore::PluginViewBase::verticalScrollbar(void)??
data:00133670?????????????????dd?offset?ZN7WebCore14PluginViewBase16wantsWheelEventsEv?;?WebCore::PluginViewBase::wantsWheelEvents(void)??
__data:00133674?????????????????align?10h??

This is virtual function table PluginWidgetIOS.?You can see from the comment after the semicolon function directly perform address point to the Widget, PluginWidget, PluginViewBase the function can the know PluginWidgetIOS is their direct or indirect subclass.

Reuse of the lldb image lookup these three classes, you can see the inheritance chain:

PluginWidgetIOS-> PluginViewBase-> PluginWidget-> Widget

The because the virtual list PluginWidget does not appear PluginViewBase the the Widget virtual table does not appear PluginWidget and PluginViewBase.?Of course, these three classes in the open source can find inheritance.

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Use the IDA and LLDB explore WebCore C + + class inheritance