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Expressions not always updating [message #821578]

Thu, 15 March 2012 14:55

Aero Engineer is currently offline

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Messages: 5
Registered: March 2012

Junior Member

I have several Watch Expressions that I am following through a debug session. However, I noticed that some of the expressions were not updating as they should have in the code. I confirmed this by doing a command line gdb session (which is the same debugger that I am using in CDT: gdb/mi).

All I was following were simple indices in nested for loops, just like below:

for ( int i = 0; i<num_rows; i++ )
{
<code>
for ( int j = 0; j < 4; j++ )
{
<code>
}
}

"i" and "j" were not updating properly in the Expressions view.

I am running eclipse Galileo with CDT Version 6.0.0.200909110608 in a Linux environment. Any idea why the above occurs? Does a later version of CDT solve the problem?

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Re: Expressions not always updating [message #822139 is a reply to message #821578]

Fri, 16 March 2012 08:07

Axel Mueller is currently offline

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Registered: July 2009

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I did not experience the problems you mentioned with Galileo. Do you have any compiler optimization turned on?

Before you ask
- search this forum
- see the FAQ http://wiki.eclipse.org/CDT/User/FAQ
- google

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Re: Expressions not always updating [message #822498 is a reply to message #822139]

Fri, 16 March 2012 18:18

Aero Engineer is currently offline

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Yes, there are some optimizer options set for the gcc compiler in the Makefile.

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Re: Expressions not always updating [message #825860 is a reply to message #822498]

Wed, 21 March 2012 10:50

Axel Mueller is currently offline

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Messages: 1973
Registered: July 2009

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Aero Engineer wrote on Fri, 16 March 2012 19:18

Yes, there are some optimizer options set for the gcc compiler in the Makefile.

If optimization is turned you will get funny results during debug. Because the compiler might rearrange your code and omit some variables. I guess the second loop in your example with constant length of 4 will be completely replaced in the optimized code.

Before you ask
- search this forum
- see the FAQ http://wiki.eclipse.org/CDT/User/FAQ
- google

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Re: Expressions not always updating [message #836613 is a reply to message #825860]

Wed, 04 April 2012 17:52

Aero Engineer is currently offline

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Messages: 5
Registered: March 2012

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Thanks for your answer. I just now got back to working on this issue.

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Re: Expressions not always updating [message #836829 is a reply to message #836613]

Thu, 05 April 2012 00:40

Lydia Jackson is currently offline

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Messages: 12
Registered: April 2012

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Very Happy

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Re: Expressions not always updating [message #836830 is a reply to message #836829]

Thu, 05 April 2012 00:40

Lydia Jackson is currently offline

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Messages: 12
Registered: April 2012

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Surprised

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Re: Expressions not always updating [message #836831 is a reply to message #836830]

Thu, 05 April 2012 00:40

Lydia Jackson is currently offline

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Messages: 12
Registered: April 2012

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hytdfhtrshtr

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Re: Expressions not always updating [message #836832 is a reply to message #836831]

Thu, 05 April 2012 00:43

Lydia Jackson is currently offline

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Messages: 12
Registered: April 2012

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rewarfretgtretg

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Re: Expressions not always updating [message #836833 is a reply to message #836832]

Thu, 05 April 2012 00:43

Lydia Jackson is currently offline

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Messages: 12
Registered: April 2012

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agree

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Re: Expressions not always updating [message #836834 is a reply to message #836833]

Thu, 05 April 2012 00:43

Lydia Jackson is currently offline

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great

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Re: Expressions not always updating [message #836837 is a reply to message #836834]

Thu, 05 April 2012 00:44

Lydia Jackson is currently offline

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Registered: April 2012

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more than words

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Re: Expressions not always updating [message #836838 is a reply to message #836837]

Thu, 05 April 2012 00:44

Lydia Jackson is currently offline

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Messages: 12
Registered: April 2012

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more than words

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Re: Expressions not always updating [message #836839 is a reply to message #836838]

Thu, 05 April 2012 00:44

Lydia Jackson is currently offline

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Messages: 12
Registered: April 2012

Junior Member

Thanks for your post

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Re: Expressions not always updating [message #836840 is a reply to message #836839]

Thu, 05 April 2012 00:45

Lydia Jackson is currently offline

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Messages: 12
Registered: April 2012

Junior Member

Great idea!

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Re: Expressions not always updating [message #836844 is a reply to message #836840]

Thu, 05 April 2012 00:50

Lydia Jackson is currently offline

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Messages: 12
Registered: April 2012

Junior Member

thanks a lot

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Re: Expressions not always updating [message #836847 is a reply to message #836844]

Thu, 05 April 2012 00:55

Lydia Jackson is currently offline

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Messages: 12
Registered: April 2012

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excellent

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