/* throws ParseException */
public static IrStmt STMT()
{
IrToken t;
IrCJump.OP n;
IrStmt s;
IrExp e1 = null, e2, e3;
IrExpList el=new IrExpList();
jj_consume_token(RegExpId.kw44);
switch ((jj_ntk == RegExpId.UNDEFINED) ? jj_ntk_fn() : jj_ntk)
{
case RegExpId.kwMOVE:
jj_consume_token(RegExpId.kwMOVE);
e1 = EXP();
e2 = EXP();
s = new IrMove(e1,e2);
break;
case RegExpId.kwJUMP:
jj_consume_token(RegExpId.kwJUMP);
e1 = EXP();
s = new IrJump((IrName)e1);
break;
case RegExpId.kwCJUMP:
jj_consume_token(RegExpId.kwCJUMP);
n = relopCode();
e1 = EXP();
e2 = EXP();
e3 = EXP();
s = new IrCJump(n,e1,e2,(IrName)e3);
break;
case RegExpId.kwLABEL:
jj_consume_token(RegExpId.kwLABEL);
t = jj_consume_token(RegExpId.ID);
s = new IrLabel(t.image);
break;
case RegExpId.kwCALLST:
jj_consume_token(RegExpId.kwCALLST);
e1 = EXP();
jj_consume_token(RegExpId.kw32);
RegExpId tmp2;
//label_3:
while (true)
{
tmp2 = (jj_ntk == RegExpId.UNDEFINED) ? jj_ntk_fn() : jj_ntk;
switch (tmp2)
{
case RegExpId.kw32:
break;
default:
jj_la1[3] = jj_gen;
goto label_3a; // break label_3;
}
e2 = EXP();
el.add(e2);
}
label_3a:
jj_consume_token(RegExpId.kw35);
s = new IrCallst((IrName)e1,el);
break;
case RegExpId.kwRETURN:
jj_consume_token(RegExpId.kwRETURN);
switch ((jj_ntk == RegExpId.UNDEFINED) ? jj_ntk_fn() : jj_ntk)
{
case RegExpId.kw32:
e1 = EXP();
break;
default:
jj_la1[4] = jj_gen;
break;
}
s = new IrReturn(e1);
break;
default:
jj_la1[5] = jj_gen;
jj_consume_token(RegExpId.UNDEFINED);
throw new IrParseException();
}
jj_consume_token(RegExpId.kw45);
return s;
//throw new Error("Missing return statement in function");
//return s;
}
public int visit(IrCallst s)
{
if (s.func.id.Equals("print")) {
// Print the argument
if (0 == s.args.size())
{
OnSystemOut(new InterpOutEventArgs());
}
else
{
IrExp arg0 = s.args.elementAt(0);
if (arg0 is IrString)
{
OnSystemOut(new InterpOutEventArgs(((IrString)arg0).s));
}
else
{
int val = arg0.accept(this);
OnSystemOut(new InterpOutEventArgs(val.ToString()));
}
}
} else {
//– find the FUNC node corresponding to the routine from the program’s funcs list, and switch there
IrFunc func = findFunc(s.func.id);
//push parameters onto the stack (at stack[sp+1], stack[sp+2], etc.);
for (int i = 0; i < s.args.size(); ++i) {
stack[sp + i + 1] = s.args.elementAt(i).accept(this);
}
// adjust the frame pointer (save the current fp in stack[sp], and set sp to be the new fp);
stack[sp] = fp;
fp = sp;
//to execute (by invoking accept() on the FUNC node);
func.accept(this);
// After control returns, restore the saved frame pointer.
sp = fp;
fp = stack[sp];
}
return STATUS_DEFAULT; // index of first statement to execute?
}
public IrStmt visit(IrCallst t)
{
IrExp args = t.args.accept(this);
IrStmt s = getStmt(args);
if (s != null)
return mergeStmts(s, new IrCallst(t.func, (IrExpList)getExp(args)));
return t;
}