Here are some more clues :
> JSC::JSLock lock(false);
>
> QWebFrame* frame =
> qobject_cast<QWebFrame*>(webView->page()->mainFrame());
>
> //QWebFrame::getWebCoreFrame() is added by me to access webkit directly, the
> implementation of that method
> //returns d->frame
> WebCore::Frame* f = frame->getWebCoreFrame();
>
> WebCore::JSDOMWindow *window = toJSDOMWindow(f);
>
> if (!window)
>
> {
>
> printf("Warning: couldn't get window object");
>
> return;
>
> }
>
> JSC::ExecState* exec = window->globalExec();
>
> JSC::JSString* p = jsString(exec, JSC::UString("test")); //<=== CRASH
> HERE
>
...
> Program received signal SIGSEGV, Segmentation fault.
> 0x01b7fe91 in JSC::ExecState::globalData (this=0x6ff38bc)
> at
> /work/qt-4.5new/src/3rdparty/webkit/JavaScriptCore/interpreter/CallFrame.h:68
> 68 return *scopeChain()->globalData;
> Current language: auto; currently c++
> (gdb) call scopeChain()
> $1 = (ScopeChainNode *) 0x0
> (gdb) bt
> #0 0x01b7fe91 in JSC::ExecState::globalData (this=0x6ff38bc)
> at
> /work/qt-4.5new/src/3rdparty/webkit/JavaScriptCore/interpreter/CallFrame.h:6
Indeed, when I log exec->scopeChain() just before the call to
jsString(), it is often (but not always) NULL. In these cases, I the
crash message from Windows says that the invalid access is to address
0x00000008. In other cases exec->scopeChain() is not NULL and then the
crash message says invalid access to address 0x000004ba. Interestingly,
when I load a heavy web page from internet (no problem with this at all,
everything works normal and the page is displayed), and query
exec->scopeChain() i also often get NULL, so it seems that it is normal
for this to be NULL. Still i'm shooting in the dark, I will dig more
deeply in the webkit code, but I will be very thankful if someone can
give me a hint.
Cheers
Alex
begin:vcard
fn:Alexander Vassilev
n:Vassilev;Alexander
org:VoipGATE S.A.
title:Senior Software Engineer
version:2.1
end:vcard
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