/**********************************************
 *  AOSD 10 Submission Files                  *
 *  asm.cd :                                  *
 *    Contains all the Asm/Eval structures    *
 *                                            *
 *********************************************/

 package gen;
 import edu.neu.ccs.demeterf.lib.*;

 Op = MathOp | StkOp | CtrlOp.
      
 MathOp= Minus.
 StkOp =  Push  | Pop | Define 
       |  Undef | Load.
 CtrlOp= Label | Jmp | IfNZ.

 Minus = "minus".

 Push  = "push" *s <i> int.
 Pop   = "pop".
 Define= "def".
 Undef = "undef".
 Load  = "load" *s <i> int.

 Label = "label" *s <id> ident.
 Jmp   = "jump" *s <id> ident.
 IfNZ  = "ifnzero" *s <id> ident.

 // Extras needed for execution
 OpList = OpCons | OpEmpty.
 OpCons = *s*s <first> Op *l <rest> OpList.
 OpEmpty= .
 ExecStack = .
 CodeEntry = <label> String <pc> OpList.