1\documentclass{standalone}
2\usepackage{makecell}
3\usepackage{pgfplots}
4\usepackage{sansmath}
5\usetikzlibrary{arrows.meta}
6\pgfplotsset{compat=1.16}
7\begin{document}
8\pagecolor{white}
9\begin{tikzpicture}[
10  x=1cm,
11  y=-.6cm,
12  every node/.append style={
13    line width=1.5pt,
14    font=\Large\sansmath\sffamily,
15  },
16  every path/.append style={
17    >={Latex[length=10pt,width=8pt]},
18    line width=1.5pt,
19  },
20  execute at end node={\vphantom{bg}},
21]
22\node[draw, rounded corners=5, inner xsep=30pt, inner ysep=2pt]
23  (bridge) at (0, .25) {\makecell{\texttt{\#\hspace{-1pt}[}cxx::bridge\texttt{]} mod\\[-4pt]description of boundary}};
24\node[draw, rounded corners, inner xsep=10pt, inner ysep=6pt, text depth=1pt]
25  (rust-bindings) at (-3.5, 6.5) {Rust bindings};
26\node[draw, rounded corners, inner xsep=10pt, inner ysep=6pt, text depth=1pt]
27  (cpp-bindings) at (3.5, 6.5) {C\texttt{++} bindings};
28\node[inner xsep=4pt, inner ysep=-0pt]
29  (rust-code) at (-9, 6.5) {\makecell[r]{\\[-8pt]Rust\\[-4pt]code}};
30\node[inner xsep=4pt, inner ysep=-0pt]
31  (cpp-code) at (9, 6.5) {\makecell[l]{\\[-8pt]C\texttt{++}\\[-4pt]code}};
32\draw (bridge) -- (0, 4);
33\draw[<->] (rust-bindings) |- (0, 4) -| (cpp-bindings);
34\draw[<->] (rust-code) -- (rust-bindings);
35\draw[<->, dash pattern=on 8pt off 6pt] (rust-bindings) -- (cpp-bindings);
36\draw[<->] (cpp-bindings) -- (cpp-code);
37\draw (-.75, 4) node[anchor=south east] {Macro expansion};
38\draw (.75, 4) node[anchor=south west] {Code generation};
39\draw (0, 6.5) node[anchor=south, inner ysep=4pt] {Hidden C ABI};
40\draw (-6.75, 6.5) node[anchor=south, inner ysep=1pt] {\makecell{Safe\\[-4pt]straightforward\\[-4pt]Rust APIs}};
41\draw (6.75, 6.5) node[anchor=south, inner ysep=1pt] {\makecell{Straightforward\\[-4pt]C\texttt{++} APIs}};
42\pgfresetboundingbox\path
43  (-9.5, 0) -- (rust-bindings.south)+(0, .3) -- (9.5, 0) -- (bridge.north);
44\end{tikzpicture}
45\end{document}
46