This training project!
Compiler for the Rust written on C++. Tokenizing almost complete set of the Rust. Syntax analyzing a set described in comments in SyntaxParser.cpp. Semantic analyzing a almost complete subset of the implemented syntax (but not always correct in terms of Rust). Compiling a ultra small subset of the Rust (declaration variable with following types: i32, i64, f32 and f64. basic operations with this types, loop {}, while ... {}, if ... {} else if ... {} ... else {} and functions. there is a way for import external symbols using additional json file) into the WASM.
usage: .\rust-compiler.exe .\main.rs
input: main.rs, main.json
output: index.html and index.wasm
The index.html file contains the template for editing. See below for an example of the edited index.html.
example of main.rs:
fn calc_fib() -> i32 {
let mut a = 1i32;
let mut b = 1i32;
let mut i = 2i32;
while i != 22i32 {
a += b;
b = a - b;
i += 1i32;
}
return a;
}
fn abs(x: f64) -> f64 {
if x < 0f64 {
return -x;
}
return x;
}
fn f(x: f64) -> f64 {
return x * x;
}
fn int(mut from: f64, to: f64, frags: f64) -> f64 {
let eps = 1e-6;
let h = (to - from) / frags;
let mut result = 0f64;
while abs(from - to) >= eps {
result += f(from) * h;
from += h;
}
return result;
}
fn main() {
print_f64(int(0f64, 2f64, 5000f64));
print_i32(calc_fib());
}example of main.json:
{
"imports": [
{
"module": "imports",
"field": "print_f64",
"type": {
"params": [ "f64" ],
"return": []
},
"associate": "print_f64"
},
{
"module": "imports",
"field": "print_i32",
"type": {
"params": [ "i32" ],
"return": []
},
"associate": "print_i32"
}
],
"exports": [
{
"field": "exported_func",
"type": {
"params": [],
"return": []
},
"associate": "main"
}
]
}example of index.html:
<!doctype html>
<html>
<body>
<script>
var importObject = {
imports: {
print_f64: (arg0) => { console.log(arg0); },
print_i32: (arg0) => { console.log(arg0); },
},
};
WebAssembly.instantiateStreaming(fetch('index.wasm'), importObject).then(obj => {
obj.instance.exports.exported_func();
});
</script>
</body>
</html>This repository is licensed with the MIT license.