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# juicebox-asm
[![Rust][wf-badge]][wf-output] [![Rustdoc][doc-badge]][doc-html]
[wf-output]: https://github.com/johannst/juicebox-asm/actions/workflows/tests.yml
[wf-badge]: https://github.com/johannst/juicebox-asm/actions/workflows/tests.yml/badge.svg
[doc-html]: https://johannst.github.io/juicebox-asm
[doc-badge]: https://img.shields.io/badge/juicebox__asm-rustdoc-blue.svg?style=flat&logo=rust
An `x64` jit assembler for learning purpose with the following two main goals:
- Learn about x64 instruction encoding.
- Learn how to use the rust type system to disallow invalid operands.
## Example
```rust
use juicebox_asm::insn::*;
use juicebox_asm::Runtime;
use juicebox_asm::{Asm, Imm32, Label, Reg32::*};
fn main() {
let mut asm = Asm::new();
// Reference implementation
// int ret = 0;
// int n = 42;
//
// loop:
// ret += n;
// --n;
// if (n != 0) goto loop;
//
// return;
let mut lp = Label::new();
asm.mov(eax, Imm32::from(0));
asm.mov(ecx, Imm32::from(42));
asm.bind(&mut lp);
asm.add(eax, ecx);
asm.dec(ecx);
asm.test(ecx, ecx);
asm.jnz(&mut lp);
asm.ret();
let mut rt = Runtime::new();
let func = unsafe { rt.add_code::<extern "C" fn() -> u32>(&asm.into_code()) };
assert_eq!(func(), (0..=42).into_iter().sum());
}
```
The [`examples/`](examples/) folder provides additional examples:
- [`fib.rs`](examples/fib.rs) jit compiles a function to compute the
`fibonacci` sequence.
- [`add.rs`](examples/add.rs) jit compiles a function calling another function
compiled into the example binary.
- [`tiny_vm.rs`](examples/tiny_vm.rs) defines a minimal `virtual machine (VM)`
with registers, instructions, data & instruction memory. The VM demonstrates
a simple *jit compiler* which has a *jit cache* and translates each *basic
block* on first execution when running a VM guest image. For reference an
interepter is also implemented.
## git hook for local development
The [`ci/`](ci) checks can be run automatically during local development by
installing the following `pre-commit` git hook.
```sh
echo 'make -C ci' > .git/hooks/pre-commit
chmod +x .git/hooks/pre-commit
```
## License
This project is licensed under the [MIT](LICENSE) license.
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