Hi,
we are going to remove the debug context soon-ish. However, if you are
running into stack overflow when creating the debug context, chances are
that you will run into stack overflow sooner or later elsewhere too.
Cheers,
Yang
On Thu, Nov 2, 2017 at 5:30 AM <anoop....@gmail.com> wrote:
> Hi All,
> This query was posted in v8-users earlier, but didn't attract any
> comments. So, posting it here hoping to get a reply.
>
> Does anyone know why the variable *debug_context_* is used?
> This is created when DevTools passes *{"id":7,"method":"Debugger.enable"}*
> to the back-end. This is the call-stack :
>
> *v8.dll!v8::internal::Debug::Load() Line 471 C++*
> * v8.dll!v8::internal::Debug::UpdateState() Line 2092 C++*
> * v8.dll!v8::debug::SetDebugDelegate(v8::Isolate * v8_isolate,
> v8::debug::DebugDelegate * delegate) Line 9641 C++*
> * v8.dll!v8_inspector::V8Debugger::enable() Line 185 C++*
> * v8.dll!v8_inspector::V8DebuggerAgentImpl::enableImpl() Line 210 C++*
> * v8.dll!v8_inspector::V8DebuggerAgentImpl::enable() Line 228 C++*
> * v8.dll!v8_inspector::protocol::Debugger::DispatcherImpl::enable(int
> callId,
> std::unique_ptr<v8_inspector::protocol::DictionaryValue,std::default_delete<v8_inspector::protocol::DictionaryValue>
> > requestMessageObject, v8_inspector::protocol::ErrorSupport * errors) Line
> 899 C++*
> * v8.dll!v8_inspector::protocol::Debugger::DispatcherImpl::dispatch(int
> callId, const v8_inspector::String16 & method,
> std::unique_ptr<v8_inspector::protocol::DictionaryValue,std::default_delete<v8_inspector::protocol::DictionaryValue>
> > messageObject) Line 890 C++*
> *
> v8.dll!v8_inspector::protocol::UberDispatcher::dispatch(std::unique_ptr<v8_inspector::protocol::Value,std::default_delete<v8_inspector::protocol::Value>
> > parsedMessage) Line 813 C++*
> *
> v8.dll!v8_inspector::V8InspectorSessionImpl::dispatchProtocolMessage(const
> v8_inspector::StringView & message) Line 343 C++*
> *> SendDebugCommand::__l2::<lambda>(bool & flag) Line 192 C++*
> * [External Code] *
> * ProcessQueue() Line 149 C++*
> * [External Code] *
>
> Already I have entered my local context scope when the json command is
> sent to v8_inspector. Most of the time, the context creation above is
> success and everything works fine. But sometimes, the stack overflow check
> for the isolate fails inside *v8.dll!v8::internal::Genesis::Genesis()*,
> which fails to update *m_debuggerContext *variable in
> *v8.dll!v8_inspector::V8Debugger::enable()* and crashes with c0000005
> when it tries to enter into scope of a null context in function
> *v8.dll!v8_inspector::V8Debugger::compileDebuggerScript()* and makes my
> application crash.
>
> This behaviour is sporadic. Sometimes the debugger works fine for hours
> before crashing, sometimes it works for 2-3 invocations and fails. Does
> anyone has any idea on this behaviour? Please reply if more details are
> needed.
>
> Thanks,
> Anoop R. S.
>
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