begin{lstlisting}[language=nasm,style=nasm, escapeinside={<>}]
CodeVersion1:   push    ax      <tikz[remember picture, overlay] node[circle,fill=red!50] (a) {};>
                push    bx

                mov     ax, bx
                add     ax, bx
                ; some more code

                pop     bx
                pop     ax
                ret

MeasureSize CodeVersion1        <tikz[remember picture, overlay] node [circle,fill=red!50] (b) {};>

CodeVersion2:   push    ax      <tikz[remember picture, overlay] node [circle,fill=red!50] (c) {};>
                push    bx

                mov     ax, bx
                sub     ax, bx
                ; some more code

                pop     bx
                pop     ax
                ret

MeasureSize CodeVersion2        <tikz[remember picture, overlay] node [circle,fill=red!50] (d) {};>

SomeLabel:      push    ax, cx  <tikz[remember picture, overlay] node [circle,fill=red!50] (e) {};>

                mov     ax, bx
                add     ax, bx
                sub     ax, bx
                ; some more code

                pop     ax, cx
                ret

MeasureSize SomeLabel           <tikz[remember picture, overlay] node [circle,fill=red!50] (f) {};>
end{lstlisting}
begin{tikzpicture}
    [
    remember picture,
    overlay,
    brace/.style = {
        decorate,
        decoration={
            brace,
            amplitude=5pt,
            mirror
        }
    }
    ]

    draw[brace] (a) grid (b);
    draw[brace] (c) grid (d);
    draw[brace] (e) grid (f);

end{tikzpicture}