[GSoC] Rust Drop trait support in gccrs - Status Report

[Janet Chien]

Hi,
My name is Janet, and my GSoC project is about implementing Rust Drop
trait support in gccrs, the Rust frontend for GCC.

Here is my latest status report for the project.

Current status:
- The draft PR I mentioned in my previous report has now been merged:
  https://github.com/Rust-GCC/gccrs/pull/4564
- This PR introduced the basic infrastructure for tracking drop
  candidates and inserting Drop calls. Based on this infrastructure, it
  supports basic block-exit cases and some basic function-scope cases.
- I also investigated the Drop insertion points in rustc 1.49 and
  adjusted the work order. I am planning to extend function-scope
  support first, followed by explicit return, continue, and break cases.

Progress this week:
- Work on a follow-up cleanup and refactoring patch based on comments
  from the previous PR. This includes refactoring CompileDrop and adding
  DropBuilder. (currently working on this)
- Continue working on function-scope Drop support, including cases such
  as:

fn f() -> i32 {
    let x = Droppable;
    foo()
}

fn foo(x: Droppable) {
}

Janet