mmtk/plan/semispace/
mutator.rs

1use super::SemiSpace;
2use crate::plan::mutator_context::common_prepare_func;
3use crate::plan::mutator_context::common_release_func;
4use crate::plan::mutator_context::Mutator;
5use crate::plan::mutator_context::MutatorBuilder;
6use crate::plan::mutator_context::MutatorConfig;
7use crate::plan::mutator_context::{
8    create_allocator_mapping, create_space_mapping, ReservedAllocators,
9};
10use crate::plan::AllocationSemantics;
11use crate::util::alloc::allocators::AllocatorSelector;
12use crate::util::alloc::BumpAllocator;
13use crate::util::{VMMutatorThread, VMWorkerThread};
14use crate::vm::VMBinding;
15use crate::MMTK;
16use enum_map::EnumMap;
17
18pub fn ss_mutator_release<VM: VMBinding>(mutator: &mut Mutator<VM>, tls: VMWorkerThread) {
19    // rebind the allocation bump pointer to the appropriate semispace
20    let bump_allocator = unsafe {
21        mutator
22            .allocators
23            .get_allocator_mut(mutator.config.allocator_mapping[AllocationSemantics::Default])
24    }
25    .downcast_mut::<BumpAllocator<VM>>()
26    .unwrap();
27    bump_allocator.rebind(
28        mutator
29            .plan
30            .downcast_ref::<SemiSpace<VM>>()
31            .unwrap()
32            .tospace(),
33    );
34
35    common_release_func(mutator, tls);
36}
37
38const RESERVED_ALLOCATORS: ReservedAllocators = ReservedAllocators {
39    n_bump_pointer: 1,
40    ..ReservedAllocators::DEFAULT
41};
42
43lazy_static! {
44    pub static ref ALLOCATOR_MAPPING: EnumMap<AllocationSemantics, AllocatorSelector> = {
45        let mut map = create_allocator_mapping(RESERVED_ALLOCATORS, true);
46        map[AllocationSemantics::Default] = AllocatorSelector::BumpPointer(0);
47        map
48    };
49}
50
51pub fn create_ss_mutator<VM: VMBinding>(
52    mutator_tls: VMMutatorThread,
53    mmtk: &'static MMTK<VM>,
54) -> Mutator<VM> {
55    let ss = mmtk.get_plan().downcast_ref::<SemiSpace<VM>>().unwrap();
56    let config = MutatorConfig {
57        allocator_mapping: &ALLOCATOR_MAPPING,
58        space_mapping: Box::new({
59            let mut vec = create_space_mapping(RESERVED_ALLOCATORS, true, ss);
60            vec.push((AllocatorSelector::BumpPointer(0), ss.tospace()));
61            vec
62        }),
63        prepare_func: &common_prepare_func,
64        release_func: &ss_mutator_release,
65    };
66
67    let builder = MutatorBuilder::new(mutator_tls, mmtk, config);
68    builder.build()
69}
mmtk/plan/semispace/mutator.rs

mmtk/plan/semispace/
mutator.rs
