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GDB

Posted on 2003-10-21
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Last Modified: 2010-04-15
with GDB, i think I should be able to directly call a function in my program then trace the flow step by step.

However, when the parameters of the function are very complicated, such as structures(within the structure, its
members can be structures too) instead of simple data type such as int or ulong, what can I do in this case in order
to debug this function?

Seems there is just no way out?

Thx!
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Question by:codenamecharlie
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6 Comments
 
LVL 45

Expert Comment

by:sunnycoder
ID: 9596844
Hi codenamecharlie,

set a break point at the first line of function ... b filename:line_number
run the program ... r
to examine the structs passed, use print
p struct_name->element


Cheers!
Sunny:o)
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Expert Comment

by:sunnycoder
ID: 9596866
>when the parameters of the function are very complicated, such as structures(within the structure, its
>members can be structures too) instead of simple data type such as int or ulong,

you might also like to set a watch if you doubt that one particular element is bein manipulated incorrectly

otherwise, setting break points and using print is the best option

If you feel more comfortable with GUIs then look into ddd .. it is the graphical front to gdb
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Accepted Solution

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brettmjohnson earned 200 total points
ID: 9596891
I think sunnycoder misinterpreted your question (or perhaps I did)

I believe you want to call a function directly from the gdb  prompt as such:

gdb> p somefunction(anInt)

which is easy if somefunction() takes an int parameter.  However if it takes
a very complex data type, that data is hard to mock up using gdb commands.

What I have done in that case is to set a breakpoint in my program logic after
the complex data structure has been created.  Then manually call somefunction,
passing the data structure constructed.

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Expert Comment

by:sunnycoder
ID: 9596898
oops .. looks like I misinterpreted it
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Author Comment

by:codenamecharlie
ID: 9596909
hi brettmjohnson,

yes, sunnycoder misinterpreted my Q and your understanding is correct.
Your way might be a way out.. i will look into it. Thx
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Expert Comment

by:sunnycoder
ID: 9886759
No comment has been added lately and this question is therefore classified abandoned.

If asker wishes to close the question, then refer to
http://www.experts-exchange.com/help/closing.jsp

Otherwise, I will leave a recommendation in the Cleanup topic area that this question is:
PAQed with A grade to brettmjohnson

Please leave any comments here within the next seven days. It is assumed that any participant not responding to this request is no longer interested in its final disposition.

PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER!

Sunny
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