Provision for array as debugger variable

Provision for array as debugger variable

[Abhijit Halder]

Hi,

in GDB we can do this to define a debugger variable:
(gdb) set $var

The $var is a scalar variable. Can we define similarly an array?

Thanks,
Abhijit Halder

Re: Provision for array as debugger variable

[Pedro Alves]

On Monday 12 September 2011 13:44:15, Abhijit Halder wrote:

> in GDB we can do this to define a debugger variable:
> (gdb) set $var
> 
> The $var is a scalar variable. Can we define similarly an array?

(gdb) set $var1 = {0, 1}
(gdb) ptype $var1
type = int [2]
(gdb) p $var1
$1 = {0, 1}

(gdb) set $var2 = (char[2]) {0, 1}
(gdb) ptype $var2
type = char [2]
(gdb) p $var2
$2 = "\000\001"

-- 
Pedro Alves

Re: Provision for array as debugger variable

[Abhijit Halder]

On Mon, Sep 12, 2011 at 7:12 PM, Pedro Alves <pedro@codesourcery.com> wrote:
> On Monday 12 September 2011 13:44:15, Abhijit Halder wrote:
>
>> in GDB we can do this to define a debugger variable:
>> (gdb) set $var
>>
>> The $var is a scalar variable. Can we define similarly an array?
>
> (gdb) set $var1 = {0, 1}
> (gdb) ptype $var1
> type = int [2]
> (gdb) p $var1
> $1 = {0, 1}
>
> (gdb) set $var2 = (char[2]) {0, 1}
> (gdb) ptype $var2
> type = char [2]
> (gdb) p $var2
> $2 = "\000\001"
>
> --
> Pedro Alves
>

Okay I got it. I'm just curious about whether we can have similarly
dynamic array and associative array along with it, and at the same
time some functionality on top of this, like push etc. function as in
perl. This will be an approach towards making gdb in itself as a
mature scripting language. Just a thought!

Re: Provision for array as debugger variable

[Pedro Alves]

On Monday 12 September 2011 15:14:52, Abhijit Halder wrote:
> On Mon, Sep 12, 2011 at 7:12 PM, Pedro Alves <pedro@codesourcery.com> wrote:
> > On Monday 12 September 2011 13:44:15, Abhijit Halder wrote:
> >
> >> in GDB we can do this to define a debugger variable:
> >> (gdb) set $var
> >>
> >> The $var is a scalar variable. Can we define similarly an array?
> >
> > (gdb) set $var1 = {0, 1}
> > (gdb) ptype $var1
> > type = int [2]
> > (gdb) p $var1
> > $1 = {0, 1}
> >
> > (gdb) set $var2 = (char[2]) {0, 1}
> > (gdb) ptype $var2
> > type = char [2]
> > (gdb) p $var2
> > $2 = "\000\001"
> >
> > --
> > Pedro Alves
> >
> 
> Okay I got it. I'm just curious about whether we can have similarly
> dynamic array and associative array along with it, and at the same
> time some functionality on top of this, like push etc. function as in
> perl. This will be an approach towards making gdb in itself as a
> mature scripting language. Just a thought!

This array syntax I've shown is meant to create artificial arrays that
can be passed to the inferior in function calls, and do manipulations
on them as if they came from the inferior in the first place.
If you want better handling of arrays for use in scripts,
a better approach that should work now, would be to use python
instead of the CLI.

-- 
Pedro Alves