/*
This program simulates the behavior of stack1.c.
*/

#include <stdio.h>

int stack[20];
int *stackpointer = stack + 20;

int main(void)
{
  /* original code from stack1.c: one(); */
  stackpointer -= 1;
  stackpointer[0] = 37;
  goto one;
  instruction37:

  /* two(); */
  stackpointer -= 1;
  stackpointer[0] = 45;
  goto two;
  instruction45:

  /* one(); */
  stackpointer -= 1;
  stackpointer[0] = 53;
  goto one;
  instruction53:

  /* two(); */
  stackpointer -= 1;
  stackpointer[0] = 61;
  goto two;
  instruction61:

  /* return 0; */
  return 0;


  one:
  /* int x = 1; */
  /* int y = 2; */
  /* int z = 3; */
  stackpointer -= 3;
#define x (stackpointer[0])
#define y (stackpointer[1])
#define z (stackpointer[2])
  x = 1; /* in other words, stackpointer[0] = 1 */
  y = 2;
  z = 3;

  /* printf("x is %d; &x is %u\n",x,(unsigned int) &x); */
  /* printf("y is %d; &y is %u\n",y,(unsigned int) &y); */
  /* printf("z is %d; &z is %u\n",z,(unsigned int) &z); */
  printf("x is %d; &x is %u\n",x,(unsigned int) &x);
  printf("y is %d; &y is %u\n",y,(unsigned int) &y);
  printf("z is %d; &z is %u\n",z,(unsigned int) &z);

  /* x += 10; */
  /* y += 10; */
  /* z += 10; */
  x += 10;
  y += 10;
  z += 10;

  /* return; */
  stackpointer += 4;
  goto returnaddress;


  two:
  stackpointer -= 2;
#define d (stackpointer[0])
#define e (stackpointer[1])
  d = 4;
  e = 5;
  printf("d is %d; &d is %u\n",d,(unsigned int) &d);
  printf("e is %d; &e is %u\n",e,(unsigned int) &e);
  d += 10;
  e += 10;
  stackpointer += 3;
  goto returnaddress;


  returnaddress:
  switch (stackpointer[-1]) {
    case 37: goto instruction37;
    case 45: goto instruction45;
    case 53: goto instruction53;
    case 61: goto instruction61;
  }
}