usage = new Usage();
usageMap.put(varId, usage);
}
// merge variables names
if (usage.getVarName() == null) {
VarName argVN = arg.getSVar().getVarName();
if (argVN == null) {
argVN = new VarName();
arg.getSVar().setVarName(argVN);
}
usage.setVarName(argVN);
} else {
arg.getSVar().setVarName(usage.getVarName());