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Stack tracing [message #38857]

Thu, 24 January 2013 13:49

Zbych
Messages: 327
Registered: July 2009

Senior Member

Hi,

Since assertion messages aren't very helpful in hunting for bugs, I decided to add some extra help to them (at least for gcc users). Modified Core/Utils.ccp/AssertFailed displays call stack similar to this one:

Stack trace:
Upp::AddStackTrace(char*, int)
Upp::AssertFailed(char const*, int, char const*)
Upp::AString<Upp::String0>::operator[](int) const
Upp::CCTalk::GetAsciiData(int, int, Upp::String&)
Upp::CCTalk::EquipmentID(int, Upp::String&)
Upp::CCTalk::FindDevs()
Upp::CCTalk::WorkingThread()
Upp::CallbackMethodAction<Upp::CCTalk, void (Upp::CCTalk::*)()>::Execute()
Upp::Callback::Execute() const
Upp::Callback::operator()() const

clone

All you need (beside modified version of Core/Utils.cpp) is '-rdynamic' added to linker options in your application.
Disadvantages? Bigger executable, much longer linking time and of course visible function names.
Debug symbols are not necessary, all function names are kept in .dynsym section.

Without -rdynamic, call stack looks like this one:

Stack trace:
() [0x82bf968]
() [0x82bfc18]
() [0x8053fbe]
() [0x8052948]
() [0x8053c51]
() [0x80522b0]
() [0x8053009]
() [0x8054d26]
() [0x825cb0a]
() [0x8050fd3]
() [0x8241889]
(
(clone

Edit:
New version of Util.cpp is uploaded.

Attachment: Util.cpp
(Size: 16.75KB, Downloaded 327 times)

[Updated on: Fri, 03 May 2013 17:08]

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Re: Stack tracing [message #38859 is a reply to message #38857]

Thu, 24 January 2013 19:32

mirek
Messages: 14160
Registered: November 2005

Ultimate Member

Nice. I will merge it into the trunk as option...

Mirek

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Re: Stack tracing [message #38864 is a reply to message #38859]

Thu, 24 January 2013 19:52

Zbych
Messages: 327
Registered: July 2009

Senior Member

OK. I have just spotted that mingw doesn't support backtrace and all conditional blocks should be:

#if defined(PLATFORM_POSIX) && defined(COMPILER_GCC)

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Re: Stack tracing [message #39817 is a reply to message #38859]

Fri, 03 May 2013 17:13

Zbych
Messages: 327
Registered: July 2009

Senior Member

Mirek,

When can you add this patch to the trunk?

[Updated on: Fri, 03 May 2013 17:14]

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Re: Stack tracing [message #42468 is a reply to message #38859]

Tue, 18 March 2014 11:17

Zbych
Messages: 327
Registered: July 2009

Senior Member

mirek wrote on Thu, 24 January 2013 19:32

Nice. I will merge it into the trunk as option...
Mirek

I noticed that stack trace requires flagSTACKTRACE since revision 7000. Maybe you could also add new link option to the core package:
When GCC POSIX STACKTRACE: -rdynamic
It will add function names to a binary file when flag STACKTRACE is present.

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Re: Stack tracing [message #42471 is a reply to message #42468]

Tue, 18 March 2014 11:33

mirek
Messages: 14160
Registered: November 2005

Ultimate Member

Now thinking about it, we could also activate with "SO"?

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Re: Stack tracing [message #42485 is a reply to message #42471]

Wed, 19 March 2014 11:19

Zbych
Messages: 327
Registered: July 2009

Senior Member

mirek wrote on Tue, 18 March 2014 11:33

we could also activate with "SO"?

Some people say that instead of adding -rdynamic it is simpler to execute:
dlopen(NULL, RTLD_NOW | RTLD_GLOBAL);
to load main binary symbol table, but I never tried it.

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Re: Stack tracing [message #42496 is a reply to message #42485]

Wed, 19 March 2014 19:31

mirek
Messages: 14160
Registered: November 2005

Ultimate Member

Zbych wrote on Wed, 19 March 2014 06:19

mirek wrote on Tue, 18 March 2014 11:33

we could also activate with "SO"?

Some people say that instead of adding -rdynamic it is simpler to execute:
dlopen(NULL, RTLD_NOW | RTLD_GLOBAL);
to load main binary symbol table, but I never tried it.

Does not seem to work..

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