iOS Safari閱讀模式分析過程

iOS Safari閱讀模式分析過程
本文為Safari閱讀模式分析過程記錄，沒有做很好的整理。最終的輸出見另一篇iOS Safari閱讀模式研究。 1. Break on evaluateb JSC::evaluate(JSC::ExecState*, JSC::ScopeChainNode*, JSC::SourceCode const&, JSC::JSValue, JSC::JSValue*)dump the source content from JSC::SourceCode 
Printing description of source.m_provider.m_ptr->m_url:
(WTF::String) m_url = { length = 0, contents = '' } {
m_impl = {
m_ptr = 0x0000000000000000 { length = 0, is8bit = 0, contents = '' }
}
}
Printing description of source.m_provider.m_ptr->m_source:
(WTF::String) m_source = { length = 66370, contents = '/*
* Copyright © 2010 Apple Inc. All rights reserved.
*/……  2. Call Stack 3.(lldb) image list[ 0] 396DF4E9-18D6-3C39-B1FB-E783D7F9B947 0x00001000 /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator6.1.sdk/Applications/MobileSafari.app/MobileSafari -> JSEvaluateScript0x70224(0x702a5) ->0x6fdc8(0x6fe19) ->0x6fd9a(0x6fdb5) -> XREF:-[ReaderTestProcessor _processReaderTestResult:tabDocument:] &-[ReaderContext isReaderAvailable]0x6eac5(0x6eae5) ->-[ReaderContext isReaderAvailable]0xa3d84(0xa3dd3)-> XREF:-[TabDocument _detectReaderAvailabilityOnWebThread]HandleRunSource i. 尋找起點3483 ->0xa3d15 -[TabDocument _detectReaderAvailabilityOnWebThread]3490 ->0xa3f56(0xa404b) -[TabDocument_detectReaderAvailabilityNow] ii. 誰發起了_detectReaderAvailabilityNow-[BrowserController stopFromAddressView:]-[TabDocument _progressDidStall]-[TabDocument webView:didFinishLoadForFrame:]-> -[TabDocument detectReaderAvailabilitySoon]3496->0xa4279-[TabDocument detectReaderAvailabilitySoon]3274->0x9c16b(0x9c1ad)-[TabDocument webView:didFinishLoadForFrame:] 4. (FAILED)b -[UIView setHidden:](lldb) showParameters 3
$56 = 0x09a43aa0 >
0x08d60840: "setHidden:" 5.b -[UIView setFrame:](lldb) showParameters 3
$26 = 0x0a984730 >
0x07b37881: "setFrame:"
0x07b3788b: "addSubview:" 96 ->0x6d38 (0x6f9d):-[AddressView _layoutReloadButtonForProgressViewFrame:forEditing:textField:showInactiveFieldWhileEditing:]257 ->0x126a4 (0x1288a):-[AddressView layoutReaderButton]3482 ->0xa3927 (0xa3caf):-[TabDocument _didDetectReaderAvailability:]3485 ->0xa3e3f (0xa3e6b): (MEM:didDetectReaderAvailability)-[AddressViewaccessibility(SafeCategory) layoutReaderButton]  6. (FAILED)根據WebKit Objective-C Programming Guide, 擷取JS資料需要先擷取window對象:id win = [webview windowScriptObject];前且所有的JS對象是使用WebScriptObject封裝起來的。 Summary: WebCore`-[WebScriptObject valueForKey:] Address: WebCore[0x00d35b30] (WebCore.__TEXT.__text + 13843984)(lldb) b WebCore`-[WebScriptObject valueForKey:]
Breakpoint 14: where = WebCore`-[WebScriptObject valueForKey:], address = 0x03581700 7.TabDocument::- (void)_detectReaderAvailabilityNow; // IMP=0x000a3f56- (void)_detectReaderAvailabilityOnWebThread; // IMP=0x000a3d15- (void)_didDetectReaderAvailability:(BOOL)arg1; // IMP=0x000a3927  8.var ReaderArticleFinderJS = new ReaderArticleFinder(document);   6fdc8(6fe24) -> 1b3ba(1b3d6) -> isReaderModeAvailable 9. break atJSObjectGetProperty(lldb) p/x `*(int*)($ebp+16)`
(int) $33 = 0x000debdf
(lldb) mem read `$33`
0x000debdf: 69 73 52 65 61 64 65 72 4d 6f 64 65 41 76 61 69 isReaderModeAvai
0x000debef: 6c 61 62 6c 65 00 70 72 65 70 61 72 65 54 6f 54 lable.prepareToT 10. 還需要再擷取對象450 ->0x1b774(0x1b777) -> returnReaderArticleFinderJS1656 ->0x5a70c (0x5a76e) ->2193 ->0x70224 (0x70315) ->2186 ->0x6fdc8(0x6fe19) ->2185 ->0x6fd9a(0x6fdb5) -> XREF:-[ReaderTestProcessor _processReaderTestResult:tabDocument:] &-[ReaderContext isReaderAvailable]2125 ->0x6eac5(0x6eae5) ->-[ReaderContext isReaderAvailable]3484 -> 0xa3d84(0xa3dd3)-> XREF:-[TabDocument _detectReaderAvailabilityOnWebThread] 11. click the "Reader" button0. a.再次確認Reader Mode 2193->0x70224(0x702a5)2186->0x6fdc8(0x6fe19)2195->0x70372(0x70387) WebThreadLock, call 6fdc8.2146->0x6f3cd(0x6f3f1) -> -[ReaderContext createArticleFinder]978->0x38445(0x384f5) [BrowserController setShowingReader:animated]122 ->0x995c(0x99bc) ->bShowing =[[BrowserControllersharedBrowserController]isShowingReader];[[BrowserControllersharedBrowserController]setShowingReader:bShowing animated:YES] b. 顯示出內容i.載入html檔案-> loadRequest (Reader~ipad.html)2132 ->0x6ee1e(0x6ee96) [ReaderContextloadReaderDocument]2118 ->0x6e85b(0x6e959) [ReaderContext createWebViewIfNeeded]3491->0xa4053(0xa4097) [TabDocumentcreateBrowserReaderViewIfNeeded]979 ->0x38549(0x38610) [BrowserControllershowReaderForTabDocument]978->0x38445(0x38526)[BrowserController setShowingReader:animated]122 ->0x995c(0x99bc)bShowing =[[BrowserControllersharedBrowserController]isShowingReader];[[BrowserControllersharedBrowserController]setShowingReader:bShowing animated:YES] ii. 在WebView允許修改window object時，執行閱讀模式處理指令碼2205 ->0x705ce(0x7066f)2127 ->0x6eb17(0x6eb62) -[ReaderContext initReaderJSController:]1296 ->0x4952c(0x49588) [BrowserReaderViewuiWebView:didClearWindowObject:forFrame] iii. 頁面載入後會執行JS：