can evaluate simple expressions

stages/lisp0/test.rs

@@ -8,12 +8,17 @@ unsafe extern "C" {
     fn getc() -> SourceIterResult;
     fn peekc() -> SourceIterResult;
 
+    fn eval(expr: Object, env: Object) -> Object;
+    fn init_env() -> Object;
+
     fn parse_next_token() -> Object;
 
     #[link_name = "ifile"]
     static mut IFILE: Source;
     #[link_name = "nil"]
     static NIL: ();
+    #[link_name = "env"]
+    static GENV: ();
 }
 
 use std::ptr::NonNull;
@@ -59,8 +64,8 @@ impl std::fmt::Debug for Object {
         }
 
         fn fmt_prim(prim: *const (), f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-            let prim_ptr = unsafe { prim.cast::<usize>().read() };
-            write!(f, "#<prim {}>", prim_ptr)
+            let prim_ptr = unsafe { prim.cast::<*const ()>().read() };
+            write!(f, "#<prim {:?}>", prim_ptr)
         }
 
         fn fmt_cons(cons: *const (), f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
@@ -110,6 +115,7 @@ impl std::fmt::Debug for Object {
                     atom.byte_add(8).cast::<usize>().read(),
                 )
             };
+
             let slice = unsafe { core::slice::from_raw_parts(ptr, len) };
             let string = core::str::from_utf8(slice).unwrap_or("<invalid utf-8>");
             write!(f, "'{string}")
@@ -335,4 +341,28 @@ mod tests {
             println!("{:?}", obj);
         }
     }
+
+    static mut ENV_INIT: std::cell::LazyCell<Object> =
+        std::cell::LazyCell::new(|| unsafe { init_env() });
+
+    #[test]
+    fn global_env() {
+        unsafe {
+            let env = unsafe { *ENV_INIT };
+            println!("{env:?}");
+        }
+    }
+
+    #[test]
+    fn eval_add() {
+        let file = ManuallyDrop::new(File::open("tests/add.l").unwrap());
+        unsafe {
+            init_source(&raw mut IFILE, file.as_raw_fd());
+            let expr = parse_next_token();
+            let env = unsafe { *ENV_INIT };
+            let result = eval(expr, env);
+            eprint!("done: ");
+            eprintln!("{result:?}");
+        }
+    }
 }