LLVM-CBE is a C-backend for LLVM, i.e. a tool that turns LLVM bitcode 1 into C

Dmitrii - Demenev

Last update: May 26, 2022

Related tags

Security tools llvm-cbe-sys

Overview

Rust bindings for `LLVM-CBE` (HALTED)

LLVM-CBE is a C-backend for LLVM, i.e. a tool that turns LLVM bitcode ¹ into C. It requires to be built near LLVM, which was found to be so heavy dependency that shipping it as Cargo crate would be absurd.

Motivation

The goal that the authors have in mind is combining LLVM-CBE with SWIG for the purpose of facilitation cross-language code reuse. SWIG is a software development tool that connects programs written in C and C++ with a variety of high-level programming languages: (1) C# (Mono and MS .NET), (2) D, (3) Go, (4) Guile, (5) Java, (6) JavaScript (Node.js, V8, and WebKit), (7) Lua, (8) MzScheme/Racket, (9) OCaml, (10) Octave, (11) Perl, (12) PHP, (13) Python, (14) R, (15) Ruby, (16) Scilab, and (17) Tcl/Tk. For every of the earlier mentioned target languages, SWIG can generate wrappers around C libraries produced by LLVM-CBE.

Generation of these libraries-wrappers from LLVM bitcode would be possible for all programming languages whose build tools offer LLVM IR generation: (1) Rust, (2) ActionScript, (3) Ada, (4) C#, (5) Common Lisp, (6) PicoListp, (7) Crystal, (8) CUDA, (9) D, (10) Delphi, (11) Dylan, (12) Forth, (13) Fortran, (14) Free Basic, (15) Free Pascal, (16) Graphical G, (17) Halide, (18) Haskell, (19) Java bytecode, (20) Julia, (21) Kotlin, (22) Lua, (23) Objective-C, (24) OpenCL, (25) PostreSQL and PLpgSQL, (26) Ruby, (27) Scala, (28) Swift, (29) XC, (30) Xojo, and (31) Zig.²

Current goal: Rust

At the time of writing, rustc - the standard compiler for the Rust programming language - relies on LLVM compiler infrastructure for machine code generation and optimization. For that, rustc internally, after transforming the Rust source code through a series of other Intermediate Representations (IRs), eventually produces so-called LLVM IR that then gets handled by LLVM infrastructure. You can learn more about LLVM IR and LLVM Bitcode File Format here.

Thus, this combination when applied for Rust would be not just on par with cbindgen but would also be considerably better.

F.A.Q.

Q: What does *-sys mean? A: *-sys is a naming convention for crates that help Rust programs use C ("system") libraries, e.g. libz-sys, kernel32-sys, lcms2-sys.³

License

^{Licensed under either of Apache License, Version 2.0 or MIT license at your option.}
_{Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in this crate by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.}

There is no typo. Bitcode, as the maintainers admit, sometimes indeed is anachronistically called bytecode. ↩
https://en.wikipedia.org/wiki/LLVM ↩
https://kornel.ski/rust-sys-crate ↩

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Comments

Support for older GCC versions

On some versions, for example 9.3.0 (Ubuntu 9.3.0-17ubuntu1~20.04), the code produced by LLVM-CBE would fail to get compiled by gcc like this

main.cbe.c:59:10: error: conflicting types for built-in function ‘printf’; expected ‘int(const char *, ...)’ [-Werror=builtin-declaration-mismatch]
   59 | uint32_t printf(uint8_t*, ...);
      |          ^~~~~~
main.cbe.c:3:1: note: ‘printf’ is declared in header ‘<stdio.h>’
    2 | #include <stdint.h>
  +++ |+#include <stdio.h>
    3 | #ifndef __cplusplus
cc1: all warnings being treated as errors

In order to solve the issue, @AP2008 suggested to use -Wno-format that presumably must solve the issue.

opened by JohnScience 0

LLVM-CBE is a C-backend for LLVM, i.e. a tool that turns LLVM bitcode 1 into C

Related tags

Overview

Rust bindings for LLVM-CBE (HALTED)

Motivation

Current goal: Rust

F.A.Q.

License

Footnotes

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