Towards a low-level systems programming language with a verified compiler
This is work in progress towards a low-level systems programming language with current work focusing on a verified compiler targeting RISC-V.
This project has similar goals as bedrock, but uses a different design: No code is shared between bedrock and bedrock2 (except a bit vector library), and compilation is implemented as a Gallina function rather than as an Ltac function.
Build 
You'll need Coq, version 8.7, 8.8, or master.
In case you didn't clone with --recursive, use make clone_all to clone the git submodules.
Then simply run make or make -j or make -jN where N is the number of cores to use. This will invoke the Makefiles of each subproject in the correct order, and also pass the -j switch to the recursive make.
Current Features
The source language is a "C-like" language called ExprImp. It is an imperative language with expressions. Currently, the only data type is word (32-bit or 64-bit), and the memory is an array of such words.
Planned features
The following features will be added soon:
- Functions
- Register allocation (spilling if more local variables are needed than registers are available)
Non-features
It is a design decision to not support the following features:
- Records
- Function pointers
Compilation Overview (as of May 29, 2018)
The source language (ExprImp) is compiled to FlatImp, which has no expressions, ie. all expressions have to be flattened into one-operation-at-a-time style assignments. FlatImp is compiled to RISC-V (the target language).
Main correctness theorems:
flattenStmt_correct_auxinFlattenExpr.vcompile_stmt_correct_auxinFlatToRiscv.vexprImp2Riscv_correctinPipeline.vcombining the two