How do I call internal function in bash if I have defined with the same name?

I want to overload the functionality of cd in bash so that I can do the following checks:

if the directory is not in DIRSTACK开发者_运维技巧 -> pushd dir

else cd dir (or cd ~#)

However now I get a recursive loop when trying to cd

The reason for this is that I am trying to work around the fact that bash does not support set dunique

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Use the builtin called "builtin":

cd () {
    builtin cd "$@"
}

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See also here for various attempts to workaround this.