This question somehow relates to my previous question, but now I have a binary which is not stripped.

Let's say I have the following code snippet

QString my_variable("almafa");
qDebug() << my_variable;

Before calling the << operator I expect that either rsi or rdi to contain the address of my_variable. Correct me if I am wrong.

   0x0000000000400aca <+100>:    lea    -0x60(%rbp),%rdx
   0x0000000000400ace <+104>:    lea    -0x50(%rbp),%rax
   0x0000000000400ad2 <+108>:    mov    %rdx,%rsi
   0x0000000000400ad5 <+111>:    mov    %rax,%rdi
   0x0000000000400ad8 <+114>:    callq  0x400d40 <QDebug::operator<<(QString const&)>

strings a.out | grep my_variable returns my_variable, so it is present in the executable. Is it somehow possible to ask gdb (or any other linux debugger) what is the variable name which belongs to a given address? my_variable is recognized by gdb since command print my_variable is working.


I was trying amritanshu's answer using the following code:

int z;
int main() 
    int x;
    x = 5;
    z = 6;
    return 0; 

Please note that z is a global variable and x is a local variable. I ran the program in gdb, paused execution of the program at the line x = 5. When I used the command

info address z

I got the following response:

Symbol "z" is static storage at address 0x601030.

And when I typed:

info symbol 0x601030

GDB displayed:

z in section .bss

So, the info symbol address command worked for me when examining a global variable. But, I wasn't able to do the same thing for the local variable x. I determined the address of x using the following command:

print &x

When I used the address that was displayed in the info symbol command, GDB displayed

No symbol matches ...

So, it may depend on whether the address your examining is used for a global or local variable. As a workaround, you can try using the command info locals, and then use the print &variable command on each local variable that is displayed.

GDB documentation on the info commands related to examining the symbol table can be found at Examining the Symbol Table.


To identify the nearest symbol for a given address you can try "info" command:

info symbol address

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