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/usr/share/bash-completion/completions/antlr4 is in antlr4 4.5.3-2.

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#
# antlr4(1) completion
#

_antlr4()
{
    local cur cur2 prev options

    _get_comp_words_by_ref -n = cur
    prev=${COMP_WORDS[COMP_CWORD-1]}

    options=("-D")

    # complete the grammar options
    if [[ " $cur" =~ " -D" ]] ; then
        # complete the language options
        if [[ "$cur" =~ "-Dlanguage=" ]] ; then
            cur2=`_get_cword`
            if [[ $cur2 == "=" ]] ; then cur2=""; fi
            COMPREPLY=( $( compgen -W 'Java CSharp JavaScript Python2 Python3' -- $cur2 ) )
        else
            COMPREPLY=( $( compgen -W '-Dlanguage= -DsuperClass= -DtokenVocab= -DTokenLabelType=' -- $cur ) )
            compopt -o nospace
        fi
        return 0
    fi

    if [[ ! "${COMP_WORDS[@]}" =~ " -o " ]];              then options+=("-o"); fi
    if [[ ! "${COMP_WORDS[@]}" =~ " -lib " ]];            then options+=("-lib"); fi
    if [[ ! "${COMP_WORDS[@]}" =~ " -atn " ]];            then options+=("-atn"); fi
    if [[ ! "${COMP_WORDS[@]}" =~ " -encoding " ]];       then options+=("-encoding"); fi
    if [[ ! "${COMP_WORDS[@]}" =~ " -message-format " ]]; then options+=("-message-format"); fi
    if [[ ! "${COMP_WORDS[@]}" =~ " -long-messages " ]];  then options+=("-long-messages"); fi
    if [[ ! "${COMP_WORDS[@]}" =~ "-listener " ]];        then options+=("-listener -no-listener"); fi
    if [[ ! "${COMP_WORDS[@]}" =~ "-visitor " ]];         then options+=("-visitor -no-visitor"); fi
    if [[ ! "${COMP_WORDS[@]}" =~ " -package " ]];        then options+=("-package"); fi
    if [[ ! "${COMP_WORDS[@]}" =~ " -depend " ]];         then options+=("-depend"); fi
    if [[ ! "${COMP_WORDS[@]}" =~ " -Werror " ]];         then options+=("-Werror"); fi
    if [[ ! "${COMP_WORDS[@]}" =~ " -XdbgST " ]];         then options+=("-XdbgST"); fi
    if [[ ! "${COMP_WORDS[@]}" =~ " -XdbgSTWait " ]];     then options+=("-XdbgSTWait"); fi
    if [[ ! "${COMP_WORDS[@]}" =~ " -Xforce-atn " ]];     then options+=("-Xforce-atn"); fi
    if [[ ! "${COMP_WORDS[@]}" =~ " -Xlog " ]];           then options+=("-Xlog"); fi

    case "$prev" in
        -o|-lib)
            # suggest a directory
            COMPREPLY=( $( compgen -o dirnames -- $cur ) )
            for ((i=0; i < ${#COMPREPLY[@]}; i++)); do
                [ -d "${COMPREPLY[$i]}" ] && COMPREPLY[$i]=${COMPREPLY[$i]}/
            done
            ;;
        -package|-encoding)
            COMPREPLY=( )
            ;;
        -message-format)
            COMPREPLY=( $( compgen -W 'antlr gnu vs2005' -- $cur )  )
            ;;
        *)
            # suggest an option or a grammar file
            COMPREPLY=( $( compgen -W '${options[@]}' -- $cur ) $( compgen -f -X '!*.g4' -- $cur ) )
            ;;
    esac

    return 0
} &&
complete -F _antlr4 antlr4