private void insertHeapVariables(IR ir,boolean backwards){
  registerHeapVariables(ir);
  registerCalls(ir);
  if (backwards) {
    registerExits(ir);
  }
  insertHeapPhiFunctions(ir);
}

private void insertHeapVariables ( IR ir , boolean backwards ) { registerHeapVariables ( ir ) ; registerCalls ( ir ) ; if ( backwards ) { registerExits ( ir ) ; } insertHeapPhiFunctions ( ir ) ; }
insert heap variables needed for array ssa form .
