Using gdb with GMP variables

Question

I am debugging some C code with gdb. My program has a variable of type mpz_t * retval. If I run the command

print *retval

I get the output

$23 = {{
    _mp_alloc = 6, 
    _mp_size = 5, 
    _mp_d = 0x1001008d0
}}

Is there anything else I can do to get more information about the value stored in retval?

Nikolai Fetissov · Accepted Answer · 2010-05-22 20:35:04Z

2

Try these:

(gdb) set print object on
(gdb) set print pretty on
(gdb) ptype *retval
(gdb) print *retval

What else do you you want to know?

answered May 22, 2010 at 20:35

Nikolai Fetissov

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4 Comments

William Entriken Over a year ago

I'd like to know what the value of _mp_d is. But if I try print (*retval)._mp_d then I get Attempt to extract a component of a value that is not a structure

Nikolai Fetissov Over a year ago

What does ptype retval->_mp_d says? Tried set print union on?

William Entriken Over a year ago

Ah, I see. I needed print *retval[0][0]._mp_d, I found this using the ptype as you suggested. Thanks.

Nikolai Fetissov Over a year ago

Oh, I see, that's an array. Didn't notice that on the first read.

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