rust async: make a graphviz file for compilation flow

Author: contrun

org/20220118160327-lowering_async_await_in_rust.org

@@ -25,7 +25,7 @@ Here are a few references:
 + [[https://github.com/rust-lang/rust/pull/43076/files][Generator support]]
 + [[https://rust-lang.github.io/async-book/][Asynchronous Programming in Rust]]
 
-Below is roughly how rust compiler compiles the rust source code into machine code.
+Below (adapted from [[https://blog.rust-lang.org/2016/04/19/MIR.html][here]]) is roughly how rust compiler compiles the rust source code into machine code.
 
 [[file:assets/images/rust-compilation-flow.svg]]
 

org/assets/images/rust-compilation-flow.dot

@@ -0,0 +1,11 @@
+digraph G {
+  source -> hir [label=" parsing\n desugaring"];
+  hir -> mir [label=" type checking"];
+  mir -> llir [label=" borrow checking\n optimization"];
+  llir -> machine_code [label=" optimization"];
+  source [shape=box,width=1.2,fixedsize=true,label="rust source"];
+  hir [shape=box,width=1.2,fixedsize=true,label="HIR"];
+  mir [shape=box,width=1.2,fixedsize=true,label="MIR"];
+  llir [shape=box,width=1.2,fixedsize=true,label="LLVM IR"];
+  machine_code [shape=box,width=1.2,fixedsize=true,label="machine code"]
+}