/* testemit.h
 *
 *   a small example program to demonstrate the use of the functions/class
 *   defined in emit.h/cc
 *
 *   to run testemit:
 *
 *       testemit > testemit.s
 *
 *   You can then examine the mips code generated in testemit.s
 *   OR, you can execute the generated code in SPIM with the following command
 *   (once you have put spim in your path).
 *
 *      spim testemit.s
 *
 */

#include "emit.h"

// create a label generator
NameGenerator lgen("label");  



// the following saves typing of quotes and dollar-signs.
// convenient for heavily used names
const string t0 = "$t0";
const string sp = "$sp";
const string ra = "$ra";

int main()
{
  string loop = lgen.gen();    // generate two unique labels
  string end = lgen.gen();
  

  cout << ".text" << endl;    // mips instructions go in the text segment

  // main program entry point
  emitLabelDef(cout, "main");

  // push return address on stack
  emit(cout, "addiu", sp, sp, imm(-4));
  emit(cout, "sw", ra, ind(4, sp));

  emit(cout, "move", t0, "$zero");  // $zero reg is hardwired with 0 value

  emitLabelDef(cout, loop);

  emit(cout, "move", "$a0", t0);

  emit(cout, "jal", "_int_println");

  emit(cout, "addiu", t0, t0, imm(1));

  emit(cout, "blt", t0, imm(10), loop);

  // this label is unused by the code, but allows us to see an
  // example of a second unique label
  emitLabelDef(cout, end);

  // pop return address
  emit(cout, "lw", ra, ind(4,sp));
  emit(cout, "addiu", sp, sp, imm(4));

  // return from main
  emit(cout, "jr", ra);


  return 0;
}