Addresses of static variables

Asked Mar 10 '19 at 16:28

Active Mar 10 '19 at 16:37

Viewed 26 times

I'm trying to understand the memory model of C and I wrote this code:

int main(int argc, char** argv){

static int addr0 = 2;
static int addr1;
printf("- addr0: %p\n", & addr0);
printf("- addr1: %p\n",&addr1);
return 0;
}

And the output was:

- addr0: 0x55e8f4094010
- addr1: 0x55e8f4094018

I did not understand why the difference between those variables was 8 and not 4, since they were allocated in sequence. In addition, where they were allocated? .bss? .data?

asked Mar 10 '19 at 16:28

chendoy

they can be allocated wherever. Since they only occur within the `main` function if you didn't get their address *and* since the `main` is not recursive, a compiler doesn't need to store them anywhere... In practice zero-initialized (including omitted initializer) variables of static storage duration go to .bss and non-zero go to .data – Antti Haapala -- Слава Україні Mar 10 '19 at 16:32
Compare for example [this](https://godbolt.org/z/Fxn1by) with [this](https://godbolt.org/z/NCRKRm) – Antti Haapala -- Слава Україні Mar 10 '19 at 16:34

Addresses of static variables

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