public void atBinExpr(BinExpr expr) throws CompileError {
int token = expr.getOperator();
/* arithmetic operators: +, -, *, /, %, |, ^, &, <<, >>, >>>
*/
int k = lookupBinOp(token);
if (k >= 0) {
expr.oprand1().accept(this);
ASTree right = expr.oprand2();
if (right == null) return; // see TypeChecker.atBinExpr().
int type1 = exprType;
int dim1 = arrayDim;
String cname1 = className;
right.accept(this);
if (dim1 != arrayDim) throw new CompileError("incompatible array types");
if (token == '+' && dim1 == 0 && (type1 == CLASS || exprType == CLASS))
atStringConcatExpr(expr, type1, dim1, cname1);
else atArithBinExpr(expr, token, k, type1);
} else {
/* equation: &&, ||, ==, !=, <=, >=, <, >
*/
if (!booleanExpr(true, expr)) {
bytecode.addIndex(7);
bytecode.addIconst(0); // false
bytecode.addOpcode(Opcode.GOTO);
bytecode.addIndex(4);
}
bytecode.addIconst(1); // true
}
}
protected void atAssignCore(Expr expr, int op, ASTree right, int type, int dim, String cname)
throws CompileError {
if (op == PLUS_E && dim == 0 && type == CLASS) atStringPlusEq(expr, type, dim, cname, right);
else {
right.accept(this);
if (invalidDim(exprType, arrayDim, className, type, dim, cname, false)
|| (op != '=' && dim > 0)) badAssign(expr);
if (op != '=') {
int token = assignOps[op - MOD_E];
int k = lookupBinOp(token);
if (k < 0) fatal();
atArithBinExpr(expr, token, k, type);
}
}
if (op != '=' || (dim == 0 && !isRefType(type))) atNumCastExpr(exprType, type);
// type check should be done here.
}