gdb python: Walking through array of structures

Question

Can't we traverse the array of structs ? I mean for each index by checking the content of structs and print each field accordingly? As we can do for a struct like

s = gdb.parse_and_eval(expr)
for k in s.type.keys():
    v = s[k]
    if is_pointer(v):
          .....
    elif is_array(v):
          .....

How to get access control on elements at each indices of an array?

Tom Tromey · Accepted Answer · 2013-06-18 15:06:40Z

4

You can index an array using the [] notation. Like, if 'v' is a gdb.Value representing an array or a pointer, you can fetch the 5th element with v[5].

The manual has a long section on the Value API that explains all of this.

answered Jun 18, 2013 at 15:06

Tom Tromey

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8 Comments

Baijnath Jaiswal Over a year ago

One more doubt i have, while doing gdb.execute('thread apply all bt') at particular thread it is showing Cannot access memory at address 0x5effffe500 and getting quit from gdb prompt. if i use try: gdb.execute('thread apply all bt') except gdb.error: gdb.write(',\n') then it is not quiting from gdb prompt but it is skipping all further threads. I want to go in each thread and print bt for all threads one by one. Is there any solotion to this or any other way to get this..? Kindly guide..

Tom Tromey Over a year ago

Iterate over the threads in Python instead. You can also compute stack traces from Python.

Baijnath Jaiswal Over a year ago

Thanks tromey:-) now i am able to iterate over all threads and printing backtrace of each thread but when exception occurs, i want to print the exact gdb error message like Cannot access memory at address 0x5effffe500 with right address in my exception handler. So how to get gdb error message?

Chris Dodd Over a year ago

Where is this mythical manual? The only one I can find (at sourceware.org/gdb/onlinedocs/gdb/…) doesn't say anything about arrays.

Tom Tromey Over a year ago

Yeah, funny, I see that the array syntax isn't documented. That's a bug in the gdb manual.

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