toni-graphics / rllvm

LLVM alternative in Rust

RLLVM

LLVM alternativ

Example

use std::error::Error;
use rllvm::prelude::*;

fn main() -> Result<(), Box<dyn Error>>{
    let mut contxt = Context::new( Triple::host() )?;
    let func = contxt.add_function("add", vec![Type::u32, Type::u32], Type::u32);
    let asm = func.asm_func()?;

    let x = asm.arg(0).unwrap();
    let y = asm.arg(1).unwrap();

    func.ir.push( Return::new(*(x + y) ) );


    unsafe {
        let mut func: JitFunction<unsafe extern "C" fn(u32, u32) -> u32> = contxt.get_jit_function("add")?;
        let out = func.call(5, 5);

        println!("main() -> {}", out);
    }

    Ok(())
}

ToDo

Here is a bit of ToDo for my libary:

v0.1.2

• Starting high level ir struct
  • Use traits impl Compiler for Ir::Add<Var, Int> so i can overload the enum variants
  • Make it compilable
  • Implement mov, add, sub, mul, div | ints, floats
    • mov
    • add
    • sub
    • mul
    • div
    • ints
    • floats
  • Starting high level ir builder
    • via traits

v0.1.3

• Implement args to the high level ir
• Add option (in context) to compile to object file
• Naming convention
  • generate
  • parse

rllvm's Issues

Division

Add divison

Jitlinker: wrong adress

Memory dump:

main:

• 0 mov ecx, 5
• 5 mov edx, 5
• 10 call 26
• 15 ret

add:

• 16 add ecx, edx
• 18 mov eax, ecx
• 20 ret

We see at adress 10 - call 26 - is the adress which is put in wrong. It should be call 20
Surly some offset bug

[JIT] sus output

The output of the function seems to be not copied so it is kept in the register which will shortly be overwritten after the call.

(Trough pure luck ~44% of uses work the rest not)

Docs

Docs workflow needs fix

Floats

Returning floats doesn't work

[JIT] Runtime Linker

Currently the runtime linker usage in the example gives acess violation:
error: process didn't exit successfully: `target\debug\examples\link.exe` (exit code: 0xc0000005, STATUS_ACCESS_VIOLATION)