ps-boa-gc 1.0.2-dev

Garbage collector for the Boa JavaScript engine.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66

mod miri {
    use boa_macros::{Finalize, Trace};

    use super::super::{Harness, run_test};
    use crate::{Gc, GcBox, GcRefCell, force_collect};

    #[test]
    fn gc_basic_cell_allocation() {
        run_test(|| {
            let gc_cell = Gc::new(GcRefCell::new(16_u16));

            force_collect();
            Harness::assert_collections(1);
            Harness::assert_bytes_allocated();
            assert_eq!(*gc_cell.borrow_mut(), 16);
        });
    }

    #[test]
    fn gc_basic_pointer_alloc() {
        run_test(|| {
            let gc = Gc::new(16_u8);

            force_collect();
            Harness::assert_collections(1);
            Harness::assert_bytes_allocated();
            assert_eq!(*gc, 16);

            drop(gc);
            force_collect();
            Harness::assert_collections(2);
            Harness::assert_empty_gc();
        });
    }

    #[test]
    // Takes too long to finish in miri
    #[cfg_attr(miri, ignore)]
    fn gc_recursion() {
        run_test(|| {
            #[derive(Debug, Finalize, Trace)]
            struct S {
                i: usize,
                next: Option<Gc<S>>,
            }

            const SIZE: usize = size_of::<GcBox<S>>();
            const COUNT: usize = 1_000_000;

            let mut root = Gc::new(S { i: 0, next: None });
            for i in 1..COUNT {
                root = Gc::new(S {
                    i,
                    next: Some(root),
                });
            }

            Harness::assert_bytes_allocated();
            Harness::assert_exact_bytes_allocated(SIZE * COUNT);

            drop(root);
            force_collect();
            Harness::assert_empty_gc();
        });
    }
}