Horrible hack to enable mutable state in rusti

rusti_state.rs

use std::collections::HashMap;
std::env::set_var("RUSTI_HACK_SYMTAB",
                  format!("{:?}", 
                          Box::into_raw(Box::new(HashMap::<&str, i64>::new()))));

fn hack_symtab() -> &'static mut HashMap<&'static str, i64> {
	unsafe {
		std::mem::transmute(
			i64::from_str_radix(
				&std::env::var("RUSTI_HACK_SYMTAB").unwrap()[2..],
				16).unwrap())
	}
}

// set!(name, value) binds name to value.
macro_rules! set {
	($name:ident, $x:expr) => {{
		hack_symtab().insert(stringify!($name), unsafe {
			std::mem::transmute(Box::into_raw(Box::new($x)))
		});
	}}
}

// get!(name, ty) gets the binding of name, assuming it was originally of type "ty", returning a ref of type "&'static ty".
macro_rules! get {
	($name:ident, $t:ty) => {{
		unsafe {
			let xaddr: i64 = *hack_symtab().get(stringify!($name)).unwrap();
			let x: &'static $t = std::mem::transmute(xaddr);
			x
		}
	}}
}


// Examples:
//   set!(a, 1); get!(a, i32) => 1  // Perfect!
//   set!(a, 1); get!(a, i64) => 4294967297  // Less good.
//   set!(a, 1); get!(a, HashMap<i32, i32>) => An unknown error occurred  // :-(