private void atStringPlusEq(Expr expr, int type, int dim, String cname, ASTree right)
throws CompileError {
if (!jvmJavaLangString.equals(cname)) badAssign(expr);
convToString(type, dim); // the value might be null.
right.accept(this);
convToString(exprType, arrayDim);
bytecode.addInvokevirtual(javaLangString, "concat", "(Ljava/lang/String;)Ljava/lang/String;");
exprType = CLASS;
arrayDim = 0;
className = jvmJavaLangString;
}
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.
}