On Nov 2, 12:54 pm, "[EMAIL PROTECTED]"
<[EMAIL PROTECTED]> wrote:
> On Nov 2, 5:50 am, Smaug <[EMAIL PROTECTED]> wrote:
>
>
>
> > On 11/2/08 7:14 AM, [EMAIL PROTECTED] wrote:
>
> > > Hi,
>
> > > I am trying to use GetCSSStyleRules() of inDOMUtils to find all the
> > > style rule of an element
>
> > > nsIDOMElement* aElement; // points to an element in the DOM
>
> > > inDOMUtils domUtils;
> > > nsCOMPtr<nsISupportsArray> rules;
> > > domUtils.GetCSSStyleRules(aElement, getter_AddRefs(rules));
>
> > > But in some cases, my program crashes with the following segmentation
> > > fault:
> > > (gdb) bt
> > > #0 0xb41bd463 in ns_if_addref<nsIStyleRule*> (expr=0xdddddddd)
> > > at ../../dist/include/xpcom/nsISupportsUtils.h:114
> > > #1 0xb41bca8d in nsInspectorCSSUtils::GetRuleNodeRule
> > > (this=0xa4419c8,
> > > aNode=0x9db0e74, aRule=0xbfc88924)
> > > at /firefox3.0.3/mozilla/layout/style/nsInspectorCSSUtils.cpp:88
> > > #2 0xb46b7779 in inDOMUtils::GetCSSStyleRules (this=0xbfc88ab4,
> > > aElement=0x9c8a3dc, _retval=0xbfc88b10)
> > > at /firefox3.0.3/mozilla/layout/inspector/src/inDOMUtils.cpp:180
>
> > > Can someone please tell me why my program crashes? I am pretty sure
> > > the element I pass to the GetCSSStyleRules() in inDOMUtils is a valid
> > > pointer. This is because I print out the tag name of the element. And
> > > the tag name is valid.
>
> > > Thank you for any pointers.
>
> > If you could post some code and perhaps a bit longer stack trace.
> > Does something keep aElement alive? I mean some nsCOMPtr variable.
>
> Thank you for your response, Smaug.
>
> Here is my code, it basically walk thru the dom and call
> domUtils.GetCSSStyleRules() of the element.
>
> Here is the code to walk the dom:
>
> void DOMWalker2::doWalkDOM(nsIDOMNSHTMLElement* element,
> nsIDOMHTMLDocument* htmlDomDoc, int level) {
>
> if (element) {
> nsCOMPtr<nsIDOMNode> domNode =
> do_QueryInterface(const_cast<nsIDOMNSHTMLElement*>(element));
>
> if (domNode) {
>
> nsCOMPtr<nsIDOMElement> domElement = do_QueryInterface(element);
>
> if (domElement) {
>
> rule.postSerializeStart(domElement, NULL);
>
> nsCOMPtr<nsIDOMNode> childNode;
> nsCOMPtr<nsIDOMNode> siblingNode;
>
> domNode->GetFirstChild(getter_AddRefs(childNode));
>
> while (childNode) {
> nsCOMPtr<nsIDOMNSHTMLElement> childElement =
> do_QueryInterface(childNode);
>
> if (childElement) {
> doWalkDOM(childElement, htmlDomDoc, level+1);
> }
>
> childNode->GetNextSibling(getter_AddRefs(siblingNode));
> childNode = siblingNode;
> }
> }
> }
> }
>
> }
>
> And here is how I call
> void CSSElmRule2::postSerializeStart(nsIDOMElement* domElement, FILE*
> fd) {
> nsAutoString tagName;
> aElement->GetTagName(tagName);
>
> printf("css style tagname %s\n",
> NS_ConvertUTF16toUTF8(tagName).get());
>
> inDOMUtils domUtils;
>
> nsCOMPtr<nsISupportsArray> rules;
> // It crashes here: But it does not always crashes. Only crashes
> when i load some
> // big pages, e.g. cnn.com
> domUtils.GetCSSStyleRules(aElement, getter_AddRefs(rules));
>
> }
>
> Here is a long stack trace:
>
> (gdb) bt
> #0 0xb5a14483 in ns_if_addref<nsIStyleRule*> (expr=0xdddddddd)
> at ../../dist/include/xpcom/nsISupportsUtils.h:114
> #1 0xb5a13aad in nsInspectorCSSUtils::GetRuleNodeRule
> (this=0x9e3e7b0,
> aNode=0x8d19918, aRule=0xbffc4e64)
> at /media/storage/working/firefox3.0.3/mozilla/layout/style/
> nsInspectorCSSUtils.cpp:88
> #2 0xb5f0ee05 in inDOMUtils::GetCSSStyleRules (this=0xbffc4fe4,
> aElement=0x9386c94, _retval=0xbffc5020)
> at /media/storage/working/firefox3.0.3/mozilla/layout/inspector/
> src/inDOMUtils.cpp:180
> #3 0xb5bbba37 in CSSElmRule2::processCSSStyle (this=0xbffc58d4,
> aElement=0x9386c94)
> at /media/storage/working/firefox3.0.3/mozilla/content/serializer/
> src/CSSElmRule2.cpp:56
> #4 0xb5bbbd1c in CSSElmRule2::postSerializeStart (this=0xbffc58d4,
> domElement=0x9386c94, fd=0x0)
> at /media/storage/working/firefox3.0.3/mozilla/content/serializer/
> src/CSSElmRule2.cpp:25
> #5 0xb5bbb6cb in DOMWalker2::doWalkDOM (this=0xbffc58d0,
> element=0x94950b8,
> htmlDomDoc=0x90adaac, level=22)
> at /media/storage/working/firefox3.0.3/mozilla/content/serializer/
> src/DOMWalker2.cpp:78
> #6 0xb5bbb7a5 in DOMWalker2::doWalkDOM (this=0xbffc58d0,
> element=0x9494fc0,
> htmlDomDoc=0x90adaac, level=21)
> at /media/storage/working/firefox3.0.3/mozilla/content/serializer/
> src/DOMWalker2.cpp:92
> #7 0xb5bbb7a5 in DOMWalker2::doWalkDOM (this=0xbffc58d0,
> element=0x938c798,
> htmlDomDoc=0x90adaac, level=20)
> at /media/storage/working/firefox3.0.3/mozilla/content/serializer/
> src/DOMWalker2.cpp:92
> #8 0xb5bbb7a5 in DOMWalker2::doWalkDOM (this=0xbffc58d0,
> element=0x9e38c10,
> htmlDomDoc=0x90adaac, level=19)
> at /media/storage/working/firefox3.0.3/mozilla/content/serializer/
> src/DOMWalker2.cpp:92
> #9 0xb5bbb7a5 in DOMWalker2::doWalkDOM (this=0xbffc58d0,
> element=0x9494fa8,
> htmlDomDoc=0x90adaac, level=18)
> at /media/storage/working/firefox3.0.3/mozilla/content/serializer/
> src/DOMWalker2.cpp:92
> #10 0xb5bbb7a5 in DOMWalker2::doWalkDOM (this=0xbffc58d0,
> element=0x9494f70,
> htmlDomDoc=0x90adaac, level=17)
> at /media/storage/working/firefox3.0.3/mozilla/content/serializer/
> src/DOMWalker2.cpp:92
> #11 0xb5bbb7a5 in DOMWalker2::doWalkDOM (this=0xbffc58d0,
> element=0x9494f38,
> htmlDomDoc=0x90adaac, level=16)
> at /media/storage/working/firefox3.0.3/mozilla/content/serializer/
> src/DOMWalker2.cpp:92
> #12 0xb5bbb7a5 in DOMWalker2::doWalkDOM (this=0xbffc58d0,
> element=0x9494f00,
> htmlDomDoc=0x90adaac, level=15)
> at /media/storage/working/firefox3.0.3/mozilla/content/serializer/
> src/DOMWalker2.cpp:92
> #13 0xb5bbb7a5 in DOMWalker2::doWalkDOM (this=0xbffc58d0,
> element=0x9494e68,
> htmlDomDoc=0x90adaac, level=14)
> at /media/storage/working/firefox3.0.3/mozilla/content/serializer/
> src/DOMWalker2.cpp:92
> #14 0xb5bbb7a5 in DOMWalker2::doWalkDOM (this=0xbffc58d0,
> element=0x9493d00,
> htmlDomDoc=0x90adaac, level=13)
> at /media/storage/working/firefox3.0.3/mozilla/content/serializer/
> src/DOMWalker2.cpp:92
> #15 0xb5bbb7a5 in DOMWalker2::doWalkDOM (this=0xbffc58d0,
> element=0x9493cc8,
> htmlDomDoc=0x90adaac, level=12)
> at /media/storage/working/firefox3.0.3/mozilla/content/serializer/
> src/DOMWalker2.cpp:92
> #16 0xb5bbb7a5 in DOMWalker2::doWalkDOM (this=0xbffc58d0,
> element=0x9493b70,
> htmlDomDoc=0x90adaac, level=11)
> at /media/storage/working/firefox3.0.3/mozilla/content/serializer/
> src/DOMWalker2.cpp:92
> #17 0xb5bbb7a5 in DOMWalker2::doWalkDOM (this=0xbffc58d0,
> element=0x9493b58,
> htmlDomDoc=0x90adaac, level=10)
> at /media/storage/working/firefox3.0.3/mozilla/content/serializer/
> src/DOMWalker2.cpp:92
> #18 0xb5bbb7a5 in DOMWalker2::doWalkDOM (this=0xbffc58d0,
> element=0x9d7eeb0,
> htmlDomDoc=0x90adaac, level=9)
> at /media/storage/working/firefox3.0.3/mozilla/content/serializer/
> src/DOMWalker2.cpp:92
> #19 0xb5bbb7a5 in DOMWalker2::doWalkDOM (this=0xbffc58d0,
> element=0x9d7ee98,
> htmlDomDoc=0x90adaac, level=8)
> at /media/storage/working/firefox3.0.3/mozilla/content/serializer/
> src/DOMWalker2.cpp:92
> #20 0xb5bbb7a5 in DOMWalker2::doWalkDOM (this=0xbffc58d0,
> element=0x9494508,
> htmlDomDoc=0x90adaac, level=7)
> at /media/storage/working/firefox3.0.3/mozilla/content/serializer/
> src/DOMWalker2.cpp:92
> #21 0xb5bbb7a5 in DOMWalker2::doWalkDOM (this=0xbffc58d0,
> element=0x9494470,
> htmlDomDoc=0x90adaac, level=6)
> at /media/storage/working/firefox3.0.3/mozilla/content/serializer/
> src/DOMWalker2.cpp:92
> #22 0xb5bbb7a5 in DOMWalker2::doWalkDOM (this=0xbffc58d0,
> element=0x94943d8,
> htmlDomDoc=0x90adaac, level=5)
> at /media/storage/working/firefox3.0.3/mozilla/content/serializer/
> src/DOMWalker2.cpp:92
> #23 0xb5bbb7a5 in DOMWalker2::doWalkDOM (this=0xbffc58d0,
> element=0x9494300,
> htmlDomDoc=0x90adaac, level=4)
> at /media/storage/working/firefox3.0.3/mozilla/content/serializer/
> src/DOMWalker2.cpp:92
> #24 0xb5bbb7a5 in DOMWalker2::doWalkDOM (this=0xbffc58d0,
> element=0x94942c8,
> htmlDomDoc=0x90adaac, level=3)
> at /media/storage/working/firefox3.0.3/mozilla/content/serializer/
> src/DOMWalker2.cpp:92
> #25 0xb5bbb7a5 in DOMWalker2::doWalkDOM (this=0xbffc58d0,
> element=0x9494290,
> htmlDomDoc=0x90adaac, level=2)
> at /media/storage/working/firefox3.0.3/mozilla/content/serializer/
> src/DOMWalker2.cpp:92
> #26 0xb5bbb7a5 in DOMWalker2::doWalkDOM (this=0xbffc58d0,
> element=0x9494218,
> htmlDomDoc=0x90adaac, level=1)
> at /media/storage/working/firefox3.0.3/mozilla/content/serializer/
> src/DOMWalker2.cpp:92
> #27 0xb5bbb7a5 in DOMWalker2::doWalkDOM (this=0xbffc58d0,
> element=0x9e41990,
> htmlDomDoc=0x90adaac, level=0)
> at /media/storage/working/firefox3.0.3/mozilla/content/serializer/
> src/DOMWalker2.cpp:92
> #28 0xb5bbb59d in DOMWalker2::walkDOM (this=0xbffc58d0,
> element=0x9e41990,
> htmlDomDoc=0x90adaac, level=0)
> at /media/storage/working/firefox3.0.3/mozilla/content/serializer/
> src/DOMWalker2.cpp:63
> #29 0xb5b9a04a in DOMSerializerIDOMEventListener::HandleEvent (
> this=0x9039ad8, aEvent=0x9e406d4)
> at /media/storage/working/firefox3.0.3/mozilla/content/serializer/
> src/DOMSerializerIDOMEventListener.cpp:171
> #30 0xb5bca247 in nsEventListenerManager::HandleEventSubType
> (this=0x90e6f10,
> aListenerStruct=0x93bda90, aListener=0x9039ad8,
> aDOMEvent=0x9e406d4,
> aCurrentTarget=0x8f8d4c4, aPhaseFlags=6)
> at /media/storage/working/firefox3.0.3/mozilla/content/events/src/
> nsEventListenerManager.cpp:1080
> #31 0xb5bca6b7 in nsEventListenerManager::HandleEvent
> (this=0x90e6f10,
> aPresContext=0x0, aEvent=0xbffc5c8c, aDOMEvent=0xbffc5bec,
> aCurrentTarget=0x8f8d4c4, aFlags=6, aEventStatus=0xbffc5bf0)
> at /media/storage/working/firefox3.0.3/mozilla/content/events/src/
> nsEventListenerManager.cpp:1185
> #32 0xb5bf8455 in nsEventTargetChainItem::HandleEvent
> (this=0x9e41c90,
> [EMAIL PROTECTED], aFlags=6)
> at /media/storage/working/firefox3.0.3/mozilla/content/events/src/
> nsEventDispatcher.cpp:210
> #33 0xb5bf86e5 in nsEventTargetChainItem::HandleEventTargetChain (
> this=0x9e41cb0, [EMAIL PROTECTED], aFlags=6, aCallback=0x0)
> at
> ...
>
> read more »
I have switched and used Mozilla Tree Walker code and I see the same
result: Segmentation Fault in
nsInspectorCSSUtils::GetRuleNodeRule().
Here is my new code:
if (bodynode) {
nsCOMPtr<nsIDOMTreeWalker> walker;
rv = trav->CreateTreeWalker(bodynode,
nsIDOMNodeFilter::SHOW_ELEMENT,
nsnull, PR_TRUE,
getter_AddRefs(walker));
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIDOMNode> currentNode;
walker->GetCurrentNode(getter_AddRefs(currentNode));
SerializeContext context(aPresShell, NULL);
CSSElmRule2 rule(context);
while (currentNode) {
nsCOMPtr<nsIDOMElement> domElm =
do_QueryInterface(currentNode);
if (domElm) {
rule.processCSSStyle(domElm);
}
walker->NextNode(getter_AddRefs(currentNode));
}
}
int CSSElmRule2::processCSSStyle(nsIDOMElement* aElement) {
// nsCOMPtr<nsIDOMElement> domElement2(aElement);
nsAutoString tagName;
aElement->GetTagName(tagName);
printf("css style tagname %s\n",
NS_ConvertUTF16toUTF8(tagName).get());
// nsCOMPtr<inIDOMUtils> domUtils;
inDOMUtils domUtils;
// do_CreateInstance("@mozilla.org/inspector/dom-utils;1");
// if (!domUtils)
// return false;
nsCOMPtr<nsISupportsArray> rules;
domUtils.GetCSSStyleRules(aElement, getter_AddRefs(rules));
}
Here is the stack trace:
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb7415700 (LWP 6692)]
0xb5ac0de3 in ns_if_addref<nsIStyleRule*> (expr=0xdddddddd)
at ../../dist/include/xpcom/nsISupportsUtils.h:114
114 return expr ? expr->AddRef() : 0;
(gdb) bt
#0 0xb5ac0de3 in ns_if_addref<nsIStyleRule*> (expr=0xdddddddd)
at ../../dist/include/xpcom/nsISupportsUtils.h:114
#1 0xb5ac040d in nsInspectorCSSUtils::GetRuleNodeRule
(this=0x961f3a8,
aNode=0xb182e170, aRule=0xbfe71cb4)
at /media/storage/working/firefox3.0.3/mozilla/layout/style/
nsInspectorCSSUtils.cpp:88
#2 0xb5fbc869 in inDOMUtils::GetCSSStyleRules (this=0xbfe71e44,
aElement=0xb1853cd4, _retval=0xbfe71ea0)
at /media/storage/working/firefox3.0.3/mozilla/layout/inspector/
src/inDOMUtils.cpp:180
#3 0xb5c69267 in CSSElmRule2::processCSSStyle (this=0xbfe720bc,
aElement=0xb1853cd4)
at /media/storage/working/firefox3.0.3/mozilla/content/serializer/
src/CSSElmRule2.cpp:60
#4 0xb5c46c44 in DOMSerializerIDOMEventListener::HandleEvent
(this=0x8a1c0b8,
aEvent=0x906cbdc)
at /media/storage/working/firefox3.0.3/mozilla/content/serializer/
src/DOMSerializerIDOMEventListener.cpp:202
#5 0xb5c77d0f in nsEventListenerManager::HandleEventSubType
(this=0x8ac7998,
aListenerStruct=0x8777a88, aListener=0x8a1c0b8,
aDOMEvent=0x906cbdc,
aCurrentTarget=0x8970454, aPhaseFlags=6)
at /media/storage/working/firefox3.0.3/mozilla/content/events/src/
nsEventListenerManager.cpp:1080
---Type <return> to continue, or q <return> to quit---\
#6 0xb5c7817f in nsEventListenerManager::HandleEvent
(this=0x8ac7998,
aPresContext=0x0, aEvent=0xbfe7249c, aDOMEvent=0xbfe723fc,
aCurrentTarget=0x8970454, aFlags=6, aEventStatus=0xbfe72400)
at /media/storage/working/firefox3.0.3/mozilla/content/events/src/
nsEventListenerManager.cpp:1185
#7 0xb5ca5f1d in nsEventTargetChainItem::HandleEvent
(this=0x96b4028,
[EMAIL PROTECTED], aFlags=6)
at /media/storage/working/firefox3.0.3/mozilla/content/events/src/
nsEventDispatcher.cpp:210
#8 0xb5ca61ad in nsEventTargetChainItem::HandleEventTargetChain (
this=0x96b4048, [EMAIL PROTECTED], aFlags=6, aCallback=0x0)
at /media/storage/working/firefox3.0.3/mozilla/content/events/src/
nsEventDispatcher.cpp:268
#9 0xb5ca6a28 in nsEventDispatcher::Dispatch (aTarget=0x8970418,
aPresContext=0x0, aEvent=0xbfe7249c, aDOMEvent=0x0,
aEventStatus=0x0,
aCallback=0x0)
at /media/storage/working/firefox3.0.3/mozilla/content/events/src/
nsEventDispatcher.cpp:483
#10 0xb5bbbe9c in nsDocument::DispatchEventToWindow (this=0x8a89ed8,
aEvent=0xbfe7249c)
at /media/storage/working/firefox3.0.3/mozilla/content/base/src/
nsDocument.cpp:5792
#11 0xb5bbc1dc in nsDocument::OnPageShow (this=0x8a89ed8,
aPersisted=0)
---Type <return> to continue, or q <return> to quit---
at /media/storage/working/firefox3.0.3/mozilla/content/base/src/
nsDocument.cpp:5820
#12 0xb5915a42 in DocumentViewerImpl::LoadComplete (this=0x8a8aa00,
aStatus=0)
at /media/storage/working/firefox3.0.3/mozilla/layout/base/
nsDocumentViewer.cpp:1007
#13 0xb56be967 in nsDocShell::EndPageLoad (this=0x8919ec0,
aProgress=0x8919ed4, aChannel=0x8a65588, aStatus=0)
at /media/storage/working/firefox3.0.3/mozilla/docshell/base/
nsDocShell.cpp:5100
#14 0xb56ef2d4 in nsWebShell::EndPageLoad (this=0x8919ec0,
aProgress=0x8919ed4, channel=0x8a65588, aStatus=0)
at /media/storage/working/firefox3.0.3/mozilla/docshell/base/
nsWebShell.cpp:1013
#15 0xb56c77e0 in nsDocShell::OnStateChange (this=0x8919ec0,
aProgress=0x8919ed4, aRequest=0x8a65588, aStateFlags=131088,
aStatus=0)
at /media/storage/working/firefox3.0.3/mozilla/docshell/base/
nsDocShell.cpp:5005
#16 0xb570b3a1 in nsDocLoader::FireOnStateChange (this=0x8919ec0,
aProgress=0x8919ed4, aRequest=0x8a65588, aStateFlags=131088,
aStatus=0)
at /media/storage/working/firefox3.0.3/mozilla/uriloader/base/
nsDocLoader.cpp:1235
#17 0xb570c127 in nsDocLoader::doStopDocumentLoad (this=0x8919ec0,
request=0x8a65588, aStatus=0)
---Type <return> to continue, or q <return> to quit---
at /media/storage/working/firefox3.0.3/mozilla/uriloader/base/
nsDocLoader.cpp:858
#18 0xb570c331 in nsDocLoader::DocLoaderIsEmpty (this=0x8919ec0)
at /media/storage/working/firefox3.0.3/mozilla/uriloader/base/
nsDocLoader.cpp:763
#19 0xb570cad6 in nsDocLoader::OnStopRequest (this=0x8919ec0,
aRequest=0x8a659e0, aCtxt=0x0, aStatus=0)
at /media/storage/working/firefox3.0.3/mozilla/uriloader/base/
nsDocLoader.cpp:679
#20 0xb6333d8f in nsLoadGroup::RemoveRequest (this=0x88028f8,
request=0x8a659e0, ctxt=0x0, aStatus=0)
at /media/storage/working/firefox3.0.3/mozilla/netwerk/base/src/
nsLoadGroup.cpp:688
#21 0xb5bb9fb8 in nsDocument::DoUnblockOnload (this=0x8a89ed8)
at /media/storage/working/firefox3.0.3/mozilla/content/base/src/
nsDocument.cpp:5741
#22 0xb5bbc6c7 in nsDocument::UnblockOnload (this=0x8a89ed8,
aFireSync=1)
at /media/storage/working/firefox3.0.3/mozilla/content/base/src/
nsDocument.cpp:5690
#23 0xb5c022c9 in ~Event (this=0x96ceda8)
at /media/storage/working/firefox3.0.3/mozilla/content/base/src/
nsImageLoadingContent.cpp:788
#24 0xb7187854 in nsRunnable::Release (this=0x96ceda8) at
nsThreadUtils.cpp:51
---Type <return> to continue, or q <return> to quit---
#25 0xb71fb18a in ~nsCOMPtr (this=0xbfe72d94)
at ../../dist/include/xpcom/nsCOMPtr.h:583
#26 0xb71f9e71 in nsThread::ProcessNextEvent (this=0x8404198,
mayWait=0,
result=0xbfe72dd8)
at /media/storage/working/firefox3.0.3/mozilla/xpcom/threads/
nsThread.cpp:523
#27 0xb71873af in NS_ProcessPendingEvents_P (thread=0x8404198,
timeout=20)
at nsThreadUtils.cpp:180
#28 0xb4f5054d in nsBaseAppShell::NativeEventCallback (this=0x8900128)
at /media/storage/working/firefox3.0.3/mozilla/widget/src/
xpwidgets/nsBaseAppShell.cpp:121
#29 0xb4f25d48 in nsAppShell::EventProcessorCallback
(source=0x88fd700,
condition=G_IO_IN, data=0x8900128)
at /media/storage/working/firefox3.0.3/mozilla/widget/src/gtk2/
nsAppShell.cpp:69
#30 0xb782e6fd in ?? () from /usr/lib/libglib-2.0.so.0
#31 0xb77f76f8 in g_main_context_dispatch () from /usr/lib/
libglib-2.0.so.0
#32 0xb77fada3 in ?? () from /usr/lib/libglib-2.0.so.0
#33 0xb77fb2c2 in g_main_loop_run () from /usr/lib/libglib-2.0.so.0
#34 0xb7cd43a9 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0
#35 0x0804e78a in main (argc=1, argv=0xbfe740e4)
at /media/storage/working/firefox3.0.3/mozilla/embedding/browser/
gtk/tests/TestGtkEmbed.cpp:401
Thank you for any more pointers.
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