Print Page - Why C::B over write gdb's set print element value?

Title: Why C::B over write gdb's set print element value?
Post by: ollydbg on December 03, 2011, 02:50:23 AM

I see when start gdb, it is:

Code Select


set print elements -1

This cause some problems, such as when a large String is put as a function argument(maybe, the wxString was loaded from a txt file), this will show all the contents of the String in the debugger log.

So, I think we can leave it as gdb default value is 200.
See:
Print Settings - Debugging with GDB (http://sourceware.org/gdb/current/onlinedocs/gdb/Print-Settings.html#Print-Settings)

Title: Re: Why C::B over write gdb's set print element value?
Post by: Jenna on December 03, 2011, 02:30:21 PM

You should say, that it is only for the debugger-branch, not for trunk.

What I don't understand is, what the value of -1 means, because a value of 0 means unlimited.

Title: Re: Why C::B over write gdb's set print element value?
Post by: ollydbg on December 03, 2011, 02:36:06 PM

Quote from: jens on December 03, 2011, 02:30:21 PM
You should say, that it is only for the debugger-branch, not for trunk.

Oh, sorry, I use only debugger branch these days.

Quote
What I don't understand is, what the value of -1 means, because a value of 0 means unlimited.

Yes, as the gdb document said, it should be 0 (not -1).

Title: Re: Why C::B over write gdb's set print element value?
Post by: oBFusCATed on December 04, 2011, 04:11:14 PM

This is the reason:
http://svn.berlios.de/wsvn/codeblocks/branches/wxpropgrid_debugger/src/plugins/debuggergdb/gdb_driver.cpp?op=revision&rev=6393&peg=7585

ollydbg: can you give an example code?

Title: Re: Why C::B over write gdb's set print element value?
Post by: ollydbg on December 05, 2011, 01:58:30 AM

Quote from: oBFusCATed on December 04, 2011, 04:11:14 PM
ollydbg: can you give an example code?

The sample code below:

Quote
int main()
{
char * p = new char[4000];
p[1]=4;//set breakpoint here
return 0;
}

You can just "print p" at the breakpoint, then gdb will show many trash.

Also, if the pointer p is passed to a function call. then when you run a "backtrace", the trash will be shown too.

Title: Re: Why C::B over write gdb's set print element value?
Post by: oBFusCATed on January 06, 2012, 12:29:28 AM

OK, I've added a way to control the value of the printed elements.
See Debug -> Information -> Print Elements.

Title: Re: Why C::B over write gdb's set print element value?
Post by: ollydbg on January 06, 2012, 01:50:54 AM

Quote from: oBFusCATed on January 06, 2012, 12:29:28 AM
OK, I've added a way to control the value of the printed elements.
See Debug -> Information -> Print Elements.

Thanks for implement this feature, I will test it ASAP.

Title: Re: Why C::B over write gdb's set print element value?
Post by: ollydbg on January 06, 2012, 02:10:10 AM

The variable name:

Code Select

m_printElements
should be:

Code Select

m_PrintElements
right?

Title: Re: Why C::B over write gdb's set print element value?
Post by: oBFusCATed on January 06, 2012, 08:54:35 AM

I prefer the first version.

Title: Re: Why C::B over write gdb's set print element value?
Post by: ollydbg on January 06, 2012, 09:46:06 AM

Quote from: oBFusCATed on January 06, 2012, 08:54:35 AM
I prefer the first version.

Me too. :)
But the C::B's coding standard （some page in the wiki) said we should use second version.

Title: Re: Why C::B over write gdb's set print element value?
Post by: MortenMacFly on January 06, 2012, 10:09:41 AM

Quote from: ollydbg on January 06, 2012, 09:46:06 AM
But the C::B's coding standard （some page in the wiki) said we should use second version.

This one:
http://wiki.codeblocks.org/index.php?title=Coding_style

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User forums => Using Code::Blocks => Topic started by: ollydbg on December 03, 2011, 02:50:23 AM