memory_layout.c

//investigate the memory layout of a c++ program
//run with: `gcc b.c && ./a.out $(seq 1000) | sort | uniq`

#define OUT(var) printf("%16lx  %s\n", (unsigned long int) &var, #var )
#define NL printf("\n")

#include <stdio.h>
#include <stdlib.h>

char global_const = 5;

void f(char f_param) {
  static char f_static = 5;
  char f_local = 5;

  OUT(f_param);OUT(f_local);OUT(f_static);NL;
  
  if (f_param > 0) f(f_param - 1);
}  

int main(int argc, char** argv) {
  char main_static = 3;
  void *heap = malloc(1);
  void *heap2_big = malloc(0x1000000);
  void *heap3 = malloc(1);

  OUT(argc);OUT(argv);OUT(*argv);OUT(**argv);NL;

  OUT(printf);OUT(fprintf);OUT(scanf);
  OUT(malloc);OUT(free);OUT(abort);NL;
  
  OUT(f);OUT(main);
  OUT(global_const);NL;
  
  OUT(main_static);
  OUT(heap);OUT(*heap);OUT(*heap2_big);OUT(*heap3);NL;
  
  f(main_static);

  return 0;
}