// *** partial implementation, will be fixed in proj2 ****
// NewObj ---
// Id cid;
public IrExp visit(AstNewObj n)
{
// A NewObj node should be translated into a CALL to "malloc" with a single argument representing the size
// of the object, followed by a sequence of statements for initializing the object’s class variables.
// A special note: the initialization expressions saved in the the symbol table entry for this purpose are
// AST expressions, and need to be translated into IR expressions. Furthermore, this translation should be
// conducted in the proper scope environment — the IrgenVisitor variable currClass needs to point to the
// object’s class.
IrStmtList stmts = new IrStmtList();
// Calculate the size of the object
ClassRec classRec = symTable.GetClass(n.cid); // <get the object's ClassRec from symbol table>;
int numVars = GetNumObjVars(classRec);
// Construct malloc call node
IrExp size = new IrBinop(IrBinop.OP.MUL, new IrConst(numVars > 0 ? numVars : 1), cWordSize);
IrCall call = new IrCall(new IrName("malloc"), new IrExpList(size));
IrTemp tmp = new IrTemp(); // This TEMP will contain the location of the object variables
stmts.add(new IrMove(tmp, call)); // Move the results of the malloc call into the temp
GetInitStmts(classRec, stmts, tmp); // Recursively get object's variable initialization statements
return new IrEseq(stmts, tmp); // Construct resulting statement
}
public AstType visit(AstNewObj n)
{
return null;
}
/* throws ParseException */
/* final */
public static AstExp astExp()
{
AstType t;
AstToken n;
AstRelop.OP relop;
AstBinop.OP binop;
AstUnop.OP unop;
AstExp e, e1, e2;
AstExpList el;
jj_consume_token(AstRegExpId.kw56);
switch ((jj_ntk == AstRegExpId.UNDEFINED)?jj_ntk_fn():jj_ntk) {
case AstRegExpId.kwArrayElm:
jj_consume_token(AstRegExpId.kwArrayElm);
e1 = astExp();
e2 = astExp();
e = new AstArrayElm(e1,e2);
break;
case AstRegExpId.kwArrayLen:
jj_consume_token(AstRegExpId.kwArrayLen);
e1 = astExp();
e = new AstArrayLen(e1);
break;
case AstRegExpId.kwBinop:
jj_consume_token(AstRegExpId.kwBinop);
binop = binOp();
e1 = astExp();
e2 = astExp();
e = new AstBinop(binop,e1,e2);
break;
case AstRegExpId.kwBoolVal:
jj_consume_token(AstRegExpId.kwBoolVal);
switch ((jj_ntk == AstRegExpId.UNDEFINED)?jj_ntk_fn():jj_ntk) {
case AstRegExpId.kwTrue:
jj_consume_token(AstRegExpId.kwTrue);
e = new AstBoolVal(true);
break;
case AstRegExpId.kwFalse:
jj_consume_token(AstRegExpId.kwFalse);
e = new AstBoolVal(false);
break;
default:
jj_la1[12] = jj_gen;
jj_consume_token(AstRegExpId.UNDEFINED);
throw new AstParseException();
}
break;
case AstRegExpId.kwCall:
jj_consume_token(AstRegExpId.kwCall);
e1 = astExp();
e2 = astExp();
el = astExpList();
e = new AstCall(e1,(AstId)e2,el);
break;
case AstRegExpId.kwId:
jj_consume_token(AstRegExpId.kwId);
n = jj_consume_token(AstRegExpId.ID);
e = new AstId(n.image);
break;
case AstRegExpId.kwIntVal:
jj_consume_token(AstRegExpId.kwIntVal);
n = jj_consume_token(AstRegExpId.INTVAL);
e = new AstIntVal(int.Parse(n.image));
break;
case AstRegExpId.kwField:
jj_consume_token(AstRegExpId.kwField);
e1 = astExp();
e2 = astExp();
e = new AstField(e1,(AstId)e2);
break;
case AstRegExpId.kwNewArray:
jj_consume_token(AstRegExpId.kwNewArray);
t = astType();
n = jj_consume_token(AstRegExpId.INTVAL);
e = new AstNewArray((AstType)t, int.Parse(n.image));
break;
case AstRegExpId.kwNewObj:
jj_consume_token(AstRegExpId.kwNewObj);
e1 = astExp();
el = astExpList();
e = new AstNewObj((AstId)e1,el);
break;
case AstRegExpId.kwRelop:
jj_consume_token(AstRegExpId.kwRelop);
relop = relOp();
e1 = astExp();
e2 = astExp();
e = new AstRelop(relop, e1, e2);
break;
case AstRegExpId.kwStrVal:
jj_consume_token(AstRegExpId.kwStrVal);
n = jj_consume_token(AstRegExpId.STRVAL);
String s = n.image;
e = new AstStrVal(s.Substring(1, s.Length-2));
break;
case AstRegExpId.kwThis:
jj_consume_token(AstRegExpId.kwThis);
e = new AstThis();
break;
case AstRegExpId.kwUnop:
jj_consume_token(AstRegExpId.kwUnop);
unop = unOp();
e1 = astExp();
e = new AstUnop(unop,e1);
break;
case AstRegExpId.kwNullExp:
jj_consume_token(AstRegExpId.kwNullExp);
e = null;
break;
default:
jj_la1[13] = jj_gen;
jj_consume_token(AstRegExpId.UNDEFINED);
throw new AstParseException();
}
jj_consume_token(AstRegExpId.kw57);
{if (true) return e;}
throw new Error("Missing return statement in function");
}
/* throws Exception */
// NewObj ---
// Id cid;
// ExpList args;
public AstType visit(AstNewObj n)
{
symTable.GetClass(n.cid);
return new AstObjType(n.cid);
}
