Static variables incorrect address

Static variables incorrect address

[Kiranmaye Gannabathula]

Hello,
I have a problem with the global static variables in gdb.

For a C program as below

static int Data = 9;

int Func1(void)
{
	return Data;
}

if i compile this with debug info and run it under gdb, when i breakpoint on
the variable Data and try to print its value i get some value and 
if i look at the address
p /x Data
i get some invalid address.

Can anyone please help me with this

Thanks Kiran.

Re: Static variables incorrect address

[Eli Zaretskii]

> From: Kiranmaye Gannabathula <kiranmaye.gannabathula@powervr.com>
> Date: Thu, 21 Mar 2002 17:18:43 -0000
> 
> static int Data = 9;
> 
> int Func1(void)
> {
> 	return Data;
> }
> 
> if i compile this with debug info and run it under gdb, when i breakpoint on
> the variable Data and try to print its value i get some value and 
> if i look at the address
> p /x Data
> i get some invalid address.

I'm sorry, from your description I cannot figure out exactly what
happened.  Please post a complete GDB session showing the commands you
typed and what GDB printed in response.

Also, what version of GDB is that, and on what platforms?

Re: Static variables incorrect address

[Michael Snyder]

Kiranmaye Gannabathula wrote:
> 
> Hello,
> I have a problem with the global static variables in gdb.
> 
> For a C program as below
> 
> static int Data = 9;
> 
> int Func1(void)
> {
>         return Data;
> }
> 
> if i compile this with debug info and run it under gdb, when i breakpoint on
> the variable Data and try to print its value i get some value and
> if i look at the address
> p /x Data
> i get some invalid address.

I believe you want to say "p /x &Data".
Otherwise you will be looking at memory at an address
determined by the value of the variable "Data".

Re: Static variables incorrect address

[Salman Khilji]

I would tend to agree with Mike.  I have used this feature with lots of 
different cases.  It works very nicely with both C and C++.  plus, you dont' 
even have to issue the run command.  You can lookup the address right after 
the startup.

There was once a problem with static member variables like these inside C++ 
namepsaces.  But that was fixed in 5.1


Salman


>From: Michael Snyder <msnyder@redhat.com>
>To: Kiranmaye Gannabathula <kiranmaye.gannabathula@powervr.com>
>CC: "'gdb@sources.redhat.com'" <gdb@sources.redhat.com>
>Subject: Re: Static variables incorrect address
>Date: Thu, 21 Mar 2002 16:12:53 -0800
>
>Kiranmaye Gannabathula wrote:
> >
> > Hello,
> > I have a problem with the global static variables in gdb.
> >
> > For a C program as below
> >
> > static int Data = 9;
> >
> > int Func1(void)
> > {
> >         return Data;
> > }
> >
> > if i compile this with debug info and run it under gdb, when i 
>breakpoint on
> > the variable Data and try to print its value i get some value and
> > if i look at the address
> > p /x Data
> > i get some invalid address.
>
>I believe you want to say "p /x &Data".
>Otherwise you will be looking at memory at an address
>determined by the value of the variable "Data".



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