mmtk/plan/marksweep/
mutator.rs

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
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
use crate::plan::barriers::NoBarrier;
use crate::plan::marksweep::MarkSweep;
use crate::plan::mutator_context::create_allocator_mapping;
use crate::plan::mutator_context::Mutator;
use crate::plan::mutator_context::MutatorConfig;
use crate::plan::mutator_context::ReservedAllocators;
use crate::plan::mutator_context::SpaceMapping;
use crate::plan::AllocationSemantics;
use crate::plan::Plan;
use crate::util::alloc::allocators::{AllocatorSelector, Allocators};
use crate::util::{VMMutatorThread, VMWorkerThread};
use crate::vm::VMBinding;
use crate::MMTK;

use enum_map::EnumMap;

#[cfg(feature = "malloc_mark_sweep")]
mod malloc_mark_sweep {
    use super::*;

    // Do nothing for malloc mark sweep (malloc allocator)

    pub fn ms_mutator_prepare<VM: VMBinding>(_mutator: &mut Mutator<VM>, _tls: VMWorkerThread) {}
    pub fn ms_mutator_release<VM: VMBinding>(_mutator: &mut Mutator<VM>, _tls: VMWorkerThread) {}

    // malloc mark sweep uses 1 malloc allocator

    pub(crate) const RESERVED_ALLOCATORS: ReservedAllocators = ReservedAllocators {
        n_malloc: 1,
        ..ReservedAllocators::DEFAULT
    };
    lazy_static! {
        pub static ref ALLOCATOR_MAPPING: EnumMap<AllocationSemantics, AllocatorSelector> = {
            let mut map = create_allocator_mapping(RESERVED_ALLOCATORS, true);
            map[AllocationSemantics::Default] = AllocatorSelector::Malloc(0);
            map
        };
    }
    pub(crate) fn create_space_mapping<VM: VMBinding>(
        plan: &'static dyn Plan<VM = VM>,
    ) -> Box<SpaceMapping<VM>> {
        let ms = plan.downcast_ref::<MarkSweep<VM>>().unwrap();
        Box::new({
            let mut vec =
                crate::plan::mutator_context::create_space_mapping(RESERVED_ALLOCATORS, true, plan);
            vec.push((AllocatorSelector::Malloc(0), ms.ms_space()));
            vec
        })
    }
}

#[cfg(not(feature = "malloc_mark_sweep"))]
mod native_mark_sweep {
    use super::*;
    use crate::util::alloc::FreeListAllocator;

    fn get_freelist_allocator_mut<VM: VMBinding>(
        mutator: &mut Mutator<VM>,
    ) -> &mut FreeListAllocator<VM> {
        unsafe {
            mutator
                .allocators
                .get_allocator_mut(mutator.config.allocator_mapping[AllocationSemantics::Default])
        }
        .downcast_mut::<FreeListAllocator<VM>>()
        .unwrap()
    }

    // We forward calls to the allocator prepare and release

    #[cfg(not(feature = "malloc_mark_sweep"))]
    pub fn ms_mutator_prepare<VM: VMBinding>(mutator: &mut Mutator<VM>, _tls: VMWorkerThread) {
        get_freelist_allocator_mut::<VM>(mutator).prepare();
    }

    #[cfg(not(feature = "malloc_mark_sweep"))]
    pub fn ms_mutator_release<VM: VMBinding>(mutator: &mut Mutator<VM>, _tls: VMWorkerThread) {
        get_freelist_allocator_mut::<VM>(mutator).release();
    }

    // native mark sweep uses 1 free list allocator

    pub(crate) const RESERVED_ALLOCATORS: ReservedAllocators = ReservedAllocators {
        n_free_list: 1,
        ..ReservedAllocators::DEFAULT
    };
    lazy_static! {
        pub static ref ALLOCATOR_MAPPING: EnumMap<AllocationSemantics, AllocatorSelector> = {
            let mut map = create_allocator_mapping(RESERVED_ALLOCATORS, true);
            map[AllocationSemantics::Default] = AllocatorSelector::FreeList(0);
            map
        };
    }
    pub(crate) fn create_space_mapping<VM: VMBinding>(
        plan: &'static dyn Plan<VM = VM>,
    ) -> Box<SpaceMapping<VM>> {
        let ms = plan.downcast_ref::<MarkSweep<VM>>().unwrap();
        Box::new({
            let mut vec =
                crate::plan::mutator_context::create_space_mapping(RESERVED_ALLOCATORS, true, plan);
            vec.push((AllocatorSelector::FreeList(0), ms.ms_space()));
            vec
        })
    }
}

#[cfg(feature = "malloc_mark_sweep")]
pub use malloc_mark_sweep::*;

#[cfg(not(feature = "malloc_mark_sweep"))]
pub use native_mark_sweep::*;

pub fn create_ms_mutator<VM: VMBinding>(
    mutator_tls: VMMutatorThread,
    mmtk: &'static MMTK<VM>,
) -> Mutator<VM> {
    let config = MutatorConfig {
        allocator_mapping: &ALLOCATOR_MAPPING,
        space_mapping: create_space_mapping(mmtk.get_plan()),
        prepare_func: &ms_mutator_prepare,
        release_func: &ms_mutator_release,
    };

    Mutator {
        allocators: Allocators::<VM>::new(mutator_tls, mmtk, &config.space_mapping),
        barrier: Box::new(NoBarrier),
        mutator_tls,
        config,
        plan: mmtk.get_plan(),
    }
}