CODEWITHSUNDEEP
cgccgdb
Tamás Kristóf
Tamás Kristóf

Reputation: 21

How can I get address info on a structure member?

I am trying to get the address of a struct member from debug info using gdb.

My problem is that I have a structure like:

typedef struct{
  int a;
  int b;
  int c;
}tstructDesc;

tstructDesc myStruct =
{
  1,
  2,
  3,
};

int main()
{
  /* Do something */
}

With gdb I can get the address of the myStruct structure with the command "info address myStruct", but I'd like to get the addresses of the member variables (myStruct.a, myStruct.b, myStruct.c). I discovered the "ptype myStruct" command which returns the definition of the struct, from which I can calculate the relative and absolute addresses, but I think it's not an effective way to get the task done.

Do you know any other way to get the addresses of the struct members?

Thanks in advance, Tamas

Upvotes: 1

Views: 2083

Answers (1)

terence hill
terence hill

Reputation: 3454

In GDB you can:

(gdb) print myStruct
$1 = {a = 1, b = 2, c = 3}
(gdb) print &myStruct
$2 = (tstructDesc *) 0x600a58 <myStruct>
(gdb) print &myStruct.a
$3 = (int *) 0x600a58 <myStruct>
(gdb) print &myStruct.b
$4 = (int *) 0x600a5c <myStruct+4>
(gdb) print &myStruct.c
$5 = (int *) 0x600a60 <myStruct+8>

Upvotes: 4

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