#compiler #cpp #preprocessor #macro #standard #generated #tree

nightly app rustycpp

An attempt to implement the C++20 standard. This is mostly to have fun & learn rust

3 releases

0.1.6 Oct 7, 2022
0.1.5 Oct 7, 2022
0.1.4 Sep 30, 2022

#660 in Programming languages

Download history 22/week @ 2024-02-26 38/week @ 2024-03-04

60 downloads per month

GPL-3.0-or-later

2MB
7.5K SLoC

Contains (JAR file, 2.5MB) antlr4-4.8-2-SNAPSHOT-complete.jar

C++20 preprocessor of C++ written in Rust

Please use git clone --recurse-submodules https://github.com/Destroyerrrocket/rustycpp.git to clone the necessary submodules

Unfortunately a custom build of lalrpop is needed.

Description

Module dependency tree generation is done!

This is a very simple and most certainly wrong preprocessor for C++. This was not done with any major intents, it was simply to test Rust and its capabilities (I find learning by doing a lot more useful than just following tutorials).

As a rust novice, I do not claim this to be of any quality.

So far, the most rellevant missing things are:

  • the #line directive is not supported (and probably won't for some time, I do not intend to support generated code for now :) )
  • QOL Features of preprocessors, like any pragma directive (none mandated by standard, but #pragma once is expected from any sensible implementation), or the __FUNCTION__ macro (which requires the step 7 parser to be implemented in order to know such information)
  • Most test macros are kinda useless right now. __has_cpp_attribute is literally just hardcoded to 0

I'd say that the first 4 steps of the compilation process of C++ are done-ish! Time for lexing.

If you want more logs on what's going on, you can use the environment varaible RUST_LOG, like so: RUST_LOG=debug

Dependencies

~9–21MB
~242K SLoC