* Detect uninitialized memory in gdb
@ 2020-03-31 6:06 Andy Fan
2020-03-31 18:48 ` Christian Biesinger
0 siblings, 1 reply; 3+ messages in thread
From: Andy Fan @ 2020-03-31 6:06 UTC (permalink / raw)
To: gdb
Greetings.
Suppose I have the following codes:
struct X { ... };
void g(struct X *x_p);
void f()
{
struct X x_var;
g(&x_var);
}
In the function of g, I want to check the data where x_p point to,
however it is possible that it is not initialized like above code. So
do we have a way to detect that the memory x_p point to is not
initialized or not in gdb?
Best Regards
Andy Fan
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Detect uninitialized memory in gdb
2020-03-31 6:06 Detect uninitialized memory in gdb Andy Fan
@ 2020-03-31 18:48 ` Christian Biesinger
2020-03-31 23:53 ` Andy Fan
0 siblings, 1 reply; 3+ messages in thread
From: Christian Biesinger @ 2020-03-31 18:48 UTC (permalink / raw)
To: Andy Fan; +Cc: gdb
On Tue, Mar 31, 2020 at 1:08 AM Andy Fan via Gdb <gdb@sourceware.org> wrote:
>
> Greetings.
>
> Suppose I have the following codes:
>
> struct X { ... };
>
> void g(struct X *x_p);
>
> void f()
> {
> struct X x_var;
> g(&x_var);
> }
>
> In the function of g, I want to check the data where x_p point to,
> however it is possible that it is not initialized like above code. So
> do we have a way to detect that the memory x_p point to is not
> initialized or not in gdb?
No, it's not really possible with GDB. You want a tool like Valgrind
or Address Sanitizer.
Christian
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Detect uninitialized memory in gdb
2020-03-31 18:48 ` Christian Biesinger
@ 2020-03-31 23:53 ` Andy Fan
0 siblings, 0 replies; 3+ messages in thread
From: Andy Fan @ 2020-03-31 23:53 UTC (permalink / raw)
To: Christian Biesinger; +Cc: gdb
On Wed, Apr 1, 2020 at 2:48 AM Christian Biesinger <cbiesinger@google.com>
wrote:
> On Tue, Mar 31, 2020 at 1:08 AM Andy Fan via Gdb <gdb@sourceware.org>
> wrote:
> >
> > Greetings.
> >
> > Suppose I have the following codes:
> >
> > struct X { ... };
> >
> > void g(struct X *x_p);
> >
> > void f()
> > {
> > struct X x_var;
> > g(&x_var);
> > }
> >
> > In the function of g, I want to check the data where x_p point to,
> > however it is possible that it is not initialized like above code. So
> > do we have a way to detect that the memory x_p point to is not
> > initialized or not in gdb?
>
> No, it's not really possible with GDB. You want a tool like Valgrind
> or Address Sanitizer.
>
> Thank you for your reply Christian. Just because I want to call gdb
script after I know it is initialized, so Valgrind is not my option now.
Best Regards
Andy Fan
^ permalink raw reply [flat|nested] 3+ messages in thread
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2020-03-31 18:48 ` Christian Biesinger
2020-03-31 23:53 ` Andy Fan
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