Sorry, I noticed this email just now.
Yes, as you said, it is a little difficult to read the source code, which is
over 4000 lines. But I will start reading the spec at the same time.
I just want to print the function call traces, and for each function call,
print the type and value of each function.
Thanks for your tip and useful information. :-)
Thanks
Best regards.
Chengnian Sun.
________________________________
From: Julian Seward <[email protected]>
To: [email protected]
Cc: Josef Weidendorfer <[email protected]>; Chengnian Sun
<[email protected]>
Sent: Thursday, February 19, 2009 10:50:05 PM
Subject: Re: [Valgrind-users] get the types and values of arguments
> AFAIK, Julian recently added some functions to get at variable name for
> a given stack address. You need it the other way around: get information
> about number of parameter and types, and how to access them.
Yes, that information (parameter names and types) is definitely in the
Dwarf3, and the new reader I did (readdwarf3.c) could probably be extended
to collect it. Unfortunately readdwarf3.c is what you could call a
complicated nightmare, so it might not be easy to make the extension.
Certainly studying the Dwarf3 spec would be helpful.
Another important question is to understand precisely what information
you do need. I imagine it will be the locations of all parameters
for the code addresses which are the entry points of functions.
At the moment readdwarf3.c throws away information about variables that
are in registers -- it only records info on variables that are in memory.
The reason is that this was not required for the initial functionality
(the exp-ptrcheck tool and to a lesser extent, Helgrind), and so that
is definitely one thing that would need to be fixed. (Since on most
platforms other than x86, at least some of the arguments are passed in
registers.)
J
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